Display device and method for manufacturing the same

Abstract

Even in a state where the display panel is physically deviated from the lighting device, the display quality can be improved. The display device includes a lighting device, a display panel, a memory, and a correction circuit. The lighting device has a light-emitting region, and the light-emitting region has a light-emitting area divided corresponding to the light source. The display panel has a display region facing the light-emitting region and having pixels arranged therein. The display region has a display area divided so as to face the light-emitting area. Data of pixel rows and columns formed by pixels associated with the display area are stored in the memory. When a positional deviation occurs between the light-emitting region and the display region, position data of pixels not facing the light-emitting region and position deviation data are stored. The correction circuit determines whether the position data of the pixels are stored in the memory. If they are stored, new pixel rows and columns are associated with each display region based on the position deviation data.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a display device and a method for manufacturing a display device. Background Art

[0002] In the manufacturing process of a liquid crystal display device, when a liquid crystal panel is mounted on a backlight, a positional deviation occurs between the liquid crystal panel and the backlight. In the case where such a positional deviation occurs, pixel values are corrected according to an error value related to the positional deviation. An example of a method for correcting pixel values includes an error value detection step, a light emission amount calculation step, and a correction step. In the error value detection step, an error value is detected according to a user operation. In the light emission amount calculation step, based on the error value detected in the error value detection step, a light source corresponding to each pixel is determined, and the necessary light emission amount of the light source is calculated according to the pixel value of the corresponding pixel. In the correction step, based on the error value detected in the error value detection step, the pixel positions of each pixel are determined, and the pixel values of each pixel are corrected to fill in the excess and deficiency of the light amount generated by the light distribution of the light source. An example of such a method is described in Patent Document 1 below.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-107881 Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] According to the above method, it may be possible to suppress image unevenness caused by an installation error when a backlight is mounted on a liquid crystal panel. However, the relative positions of the light source and the sub-display areas obtained by dividing the display area are not corrected. That is, the excess or deficiency of the light amount generated from the light source irradiating the sub-display areas is not eliminated, but only the excess and deficiency of the light amount are corrected by correcting the pixel values. Although it is possible to compensate for the excess and deficiency of the light amount by correcting the pixel values, since the pixel values are corrected, the display gray scale of the pixels may be different from the designed display gray scale, and there is a possibility that the display quality cannot be sufficiently improved.

[0008] The technology described in this specification is a technology completed based on the above situation, and its object is to improve the display quality even in a state where the display panel is physically deviated from the lighting device.

[0009] Technical Solution for Solving the Technical Problem

[0010] (1) The display device related to the technology described in this specification includes an illumination device, a display panel, a memory, and a correction circuit. The illumination device includes a plurality of light sources and has a light-emitting area from which light emitted from the plurality of light sources exits. The light-emitting area has a plurality of light-emitting regions divided corresponding to the plurality of light sources. The display panel is mounted on the illumination device. The display panel has: a display area that faces the light-emitting area and displays an image; and a non-display area located around the display area. The display panel includes a plurality of pixels arranged in a matrix in the display area. The display area has a plurality of display regions divided to face the plurality of light-emitting regions. The memory stores default pixel row-column data, and the default pixel row-column data includes position data of a plurality of pixel rows and columns formed by associating the plurality of pixels designed in the plurality of display regions. When a position shift occurs between the light-emitting area and the display area, non-facing pixel data and position shift data are stored. The non-facing pixel data includes position data of pixels that do not face the light-emitting area when the position shift occurs among the plurality of pixels. The position shift data includes data representing a position shift direction and a displacement amount related to the position shift between a plurality of pixel rows and columns facing the plurality of light-emitting regions when the position shift occurs and the plurality of pixel rows and columns included in the default pixel row-column data. The correction circuit is connected to the memory and determines whether the non-facing pixel data is stored in the memory. When the non-facing pixel data is stored, the correction circuit stores pixel row-column data in the memory, and the pixel row-column data is generated by newly associating, for each of the plurality of display regions, a plurality of pixel rows and columns formed by the plurality of pixels existing at positions shifted only by the displacement amount in the position shift direction represented by the position shift data with respect to the plurality of pixel rows and columns included in the default pixel row-column data.

[0011] (2) The position shift data indicates in which direction the plurality of pixel rows and columns included in the default pixel row-column data are shifted by several rows and several columns of the plurality of pixels with respect to the plurality of light-emitting regions.

[0012] (3) The display device further includes a display driver that is connected to the display panel and displays the image in the plurality of display regions associated with the plurality of pixel rows and columns included in the pixel row-column data.

[0013] (4) The display panel has a preliminary display area between the display area and the non-display area, and includes a plurality of pixels arranged in a matrix in the preliminary display area. The correction circuit generates pixel row and column data that newly associates the plurality of pixel rows and columns with each of the plurality of display areas, and stores the data in the memory. The plurality of pixel rows and columns are composed of the plurality of pixels arranged in the display area and the plurality of pixels arranged in the preliminary display area, and the plurality of pixels existing at positions that are only offset by the position offset amount in the position offset direction indicated by the position offset data.

[0014] (5) The display device further includes an image signal processing circuit connected to the correction circuit, which receives an image signal related to the image displayed in the plurality of display areas, processes the image signal, and inputs the processed image signal to the display driver. In such a configuration, the display driver receives the processed image signal and causes the plurality of display areas to display the image according to the image signal.

[0015] (6) The display device further includes an arithmetic circuit connected to the correction circuit, which receives the pixel row and column data from the correction circuit and calculates, for each of the plurality of display areas, a value representing the brightness necessary for displaying the image according to the pixel row and column data.

[0016] (7) The arithmetic circuit receives the processed image signal from the correction circuit and calculates, for each of the plurality of display areas, a value representing the brightness necessary for displaying the image based on the pixel row and column data and the processed image signal.

[0017] (8) The correction circuit generates black display pixel data and stores it in the memory. The black display pixel data includes position data of the plurality of pixels not associated with the plurality of display areas. In such a configuration, the display driver causes the plurality of pixels included in the black display pixel data to display a black image.

[0018] (9) The manufacturing method of a display device according to the technology described in this specification divides the light-emitting area where light is emitted from a plurality of light sources of an illumination device having a plurality of light sources, and sets a plurality of light-emitting areas corresponding to the plurality of light sources. For a display panel having a display area for displaying an image and a non-display area around the display area, and having a plurality of pixels arranged in a matrix in the display area, the display area is divided into a plurality of display areas corresponding to the plurality of light-emitting areas; the display panel is mounted on the illumination device, and the plurality of display areas are used as a plurality of default display areas, and it is determined whether a positional shift has occurred between a plurality of pixel rows and columns formed by the plurality of pixels arranged in the plurality of default display areas and the plurality of light-emitting areas facing the plurality of pixel rows and columns. When a positional shift has occurred, the direction and amount of the positional shift of the plurality of pixel matrices relative to the plurality of light-emitting areas are judged, and for the plurality of pixel rows and columns, a region where a plurality of pixel rows and columns formed by the plurality of pixels existing at positions only shifted by the amount of the positional shift in the direction of the positional shift is set as a new plurality of display areas.

[0019] (10) Before the determination of the positional shift, all of the plurality of light sources are turned on, and light is transmitted from the plurality of display areas corresponding to the plurality of light-emitting areas, and the brightness of each of the plurality of display areas is measured; the brightness of each of the plurality of display areas is compared with a specified value; display areas having a brightness higher than the specified value and display areas having a brightness lower than the specified value are determined, and the light emission amount of the plurality of light sources corresponding to the light-emitting areas facing the display areas having a brightness higher than the specified value among the plurality of light-emitting areas is reduced; the light emission amount of the plurality of light sources corresponding to the light-emitting areas facing the display areas having a brightness lower than the specified value is increased, so as to make the brightness in the display area uniform.

[0020] (11) Set the light-emitting area located at the center of the light-emitting region among the multiple light-emitting areas as the reference light-emitting area, and set the four light-emitting areas existing at the upper, lower, left, and right positions with the same distance from the reference light-emitting area as the specified light-emitting areas for the reference light-emitting area among the multiple light-emitting areas. Select the default display areas facing the specified light-emitting areas respectively from the multiple default display areas, and set the specified display areas at positions that are only offset by a specified pixel amount relative to the pixel rows and columns configured in the selected default display areas. Turn on the multiple light sources corresponding to the specified light-emitting areas; drive the multiple pixels configured in the specified display areas; measure the amount of transmitted light from the specified display areas, determine the specified display area with the most transmitted light, and determine the position offset direction and the position offset amount by judging in which direction and by how much the determined specified display area is offset relative to the default display area corresponding to the determined specified display area.

[0021] (12) Set the four light-emitting areas located at the upper, lower, left, and right positions with the same distance from the reference light-emitting area and located outside the four light-emitting areas relative to the reference light-emitting area among the multiple light-emitting areas as the specified light-emitting areas respectively. Select the default display areas facing the specified light-emitting areas respectively from the multiple default display areas, and set the specified display areas at positions that are only offset by a specified pixel amount relative to the pixel columns composed of the pixels configured in the selected default display areas.

[0022] (13) Set the four light-emitting areas existing at the upper right, upper left, lower right, and upper left positions with the same distance from the reference light-emitting area among the multiple light-emitting areas as the specified light-emitting areas respectively. Select the default display areas facing the specified light-emitting areas respectively from the multiple default display areas, and set the specified display areas at positions that are only offset by a specified pixel amount relative to the pixel rows and columns composed of the pixels configured in the selected default display areas.

[0023] Advantageous Effects

[0024] The technology described in this specification is a technology completed based on the above situation, and its purpose is to improve the display quality even when the display panel is physically deviated from the lighting device. Brief Description of the Drawings

[0025] Figure 1 It is a top view of a liquid crystal panel constituting a liquid crystal display device of Embodiment 1.

[0026] Figure 2 It is a circuit diagram showing the arrangement of pixels of the liquid crystal panel.

[0027] Figure 3 It is a top view of a backlight device constituting a liquid crystal display device.

[0028] Figure 4 It is a top view showing a magnified part of a liquid crystal display device.

[0029] Figure 5 It is a block diagram showing the electrical configuration of a liquid crystal display device.

[0030] Figure 6 It is a partial top view of a liquid crystal display device showing a state where a positional shift occurs between a liquid crystal panel and a backlight device.

[0031] Figure 7 It is a magnified Figure 6 part of the top view.

[0032] Figure 8 It is a schematic diagram of pixel rows and columns, a default display area, and a display area.

[0033] Figure 9 It is a flowchart showing a correction process.

[0034] Figure 10 It is a top view of the liquid crystal panel of Embodiment 2.

[0035] Figure 11 It is a top view of a magnified part of the liquid crystal panel.

[0036] Figure 12 It is a block diagram showing the electrical configuration of a liquid crystal display device.

[0037] Figure 13 It is an upper magnified top view of a liquid crystal display device showing a state where a positional shift occurs between a liquid crystal panel and a backlight device.

[0038] Figure 14 It is a left magnified top view of a liquid crystal display device showing a state where a positional shift occurs between a liquid crystal panel and a backlight device.

[0039] Figure 15 It is a flowchart showing a correction process.

[0040] Figure 16 It is a schematic diagram of pixel rows and columns, a default display area, and a display area in the upper part of the liquid crystal panel.

[0041] Figure 17 It is a schematic diagram of pixel rows and columns, a default display area, and a display area in the left part of the liquid crystal panel.

[0042] Figure 18 It is an upper magnified view of the liquid crystal display device after the correction process.

[0043] Figure 19 It is a left magnified view of the liquid crystal display device after the correction process.

[0044] Figure 20 is a block diagram showing the electrical configuration of the liquid crystal display device according to Embodiment 3.

[0045] Figure 21 is a top view showing a state where light is emitted from a specific light-emitting area in the backlight device.

[0046] Figure 22 is a top view showing a state where light is transmitted to a specific display area in the liquid crystal panel.

[0047] Figure 23 is a top view showing the positional relationship between the display area and the designated display area.

[0048] Figure 24 is an enlarged plan view near the center of the display area showing the positional relationship between the designated display area and the designated light-emitting area. Detailed Embodiments

[0049] <Embodiment 1>

[0050] Refer to Figures 1 to 9 to describe the liquid crystal display device 10 and its manufacturing method. As Figure 5 shown, the liquid crystal display device 10 includes a liquid crystal panel 11 (display panel), a backlight device 16 (lighting device), and a control circuit 18. The liquid crystal display device 10 is used, for example, in a head-mounted display or the like.

[0051] As Figure 1 shown, the liquid crystal panel 11 has a vertically long octagonal shape in a top view. The liquid crystal panel 11 has a screen with a display area AA where an image is displayed in a central side portion and a non-display area NAA where an image is not displayed in an outer portion around the display area AA. In addition, in Figure 1 , the display area A is the area inside the single-dot chain line. The display area AA has a vertically long octagonal shape along the outer shape of the liquid crystal panel 11 in a top view. The non-display area NAA has a vertically long octagonal frame shape along the outer shape of the display area AA in a top view. When the liquid crystal display device 10 is used in a head-mounted display, the resolution of the display area A of the liquid crystal panel 11 is preferably 1000 ppi (pixels per inch) or more, but is not limited thereto.

[0052] The display area AA includes a plurality of first display areas AA1 and a plurality of second display areas AA2 divided in the x-axis direction and the y-axis direction. More specifically, the display area AA is equally divided in the x-axis direction and the y-axis direction such that 24 first display areas AA1 are included in one row of the longest portion in the x-axis direction and 24 first display areas AA1 are included in one column of the longest portion in the y-axis direction. In Figure 1In it, the region divided by the straight line L1 extending in the x-axis direction and the straight line L2 extending in the Y-axis direction is used as the first display region AA1, and the region divided by the straight line L1, L2, and the edge inclined with respect to the x-axis direction and the Y-axis direction is used as the second display region AA2.

[0053] The first display regions AA1 are respectively vertically long rectangles, and the second display regions AA2 are respectively in the shape with hypotenuses. Although the first display regions AA1 all have the same area, the second display regions AA2 include regions with different shapes or areas.

[0054] The liquid crystal panel 11 includes a counter substrate and an array substrate (active row and column substrate, element substrate). The array substrate is arranged on the back side of the counter substrate and pasted on the counter substrate. The counter substrate and the array substrate respectively have glass substrates, and various films are laminated on the inner surfaces of the glass substrates. It should be noted that polarizing plates are respectively pasted on the outer surfaces of the two substrates.

[0055] As Figure 2 shown, on the glass substrate of the array substrate, gate wirings 12 (scanning wirings) and source wirings 13 (image wirings) are arranged in a grid pattern. Near the intersection points where the gate wirings 12 and the source wirings 13 cross, TFTs 14 (switching elements) and pixel electrodes 15 are arranged.

[0056] The gate wirings 12 extend along the x-axis direction in a manner that traverses the display region A. Each gate wiring 12 is connected to the gate electrode 14A of the corresponding TFT 14. The gate wirings 12 are arranged at intervals in the Y-axis direction. The gate wirings 12 transmit scanning signals. The source wirings 13 extend along the Y-axis direction in a manner that runs through the display region A. Each source wiring 13 is connected to the source electrode 14B of the corresponding TFT 14. The source wirings 13 are arranged at intervals in the x-axis direction. The source wirings transmit image signals (data signals).

[0057] A plurality of TFTs 14 and pixel electrodes 15 are regularly arranged in a row along the X-axis direction and a plurality of them are regularly arranged in a column along the Y-axis direction, and as a whole, they are arranged in a matrix-like planar configuration. The corresponding pixel electrode 15 is connected to the drain electrode 14C of each TFT 14. The TFT 14 has a channel region 14D formed of an oxide semiconductor film. The channel region 14D is connected to the source electrode 14B and the drain electrode 14C. If the TFT 14 is driven based on the scanning signal transmitted by the gate wiring 12, the image signal transmitted by the source wiring 13 is supplied to the drain electrode 14C via the channel region 14D. As a result, the pixel electrode 15 becomes a potential based on the image signal.

[0058] On the inner surface of the counter substrate in the display area AA, there are color filters in red (R), green (G), and blue (B) and light-shielding portions (black matrices). The color filters are arranged to face the pixel electrodes 15. The light-shielding portions are arranged between the color filters and form the intervals between adjacent color filters. Each red color filter and the pixel electrode 15 facing it constitute a red unit pixel RUPX. Each green color filter and the pixel electrode 15 facing it constitute a green unit pixel GUPX. Each blue color filter and the pixel electrode 15 facing it constitute a blue unit pixel BUPX. One pixel PX is composed of adjacent red unit pixels RUPX, green unit pixels GUPX, and blue unit pixels BUPX.

[0059] In the display area AA, a plurality of pixels PX are arranged in a matrix. Each pixel PX can display a color with a specified gray scale. The sizes of each of the plurality of pixels PX in the X-axis direction are substantially the same, and the sizes of each of them in the Y-axis direction are also substantially the same. When the liquid crystal display device 10 is used for a head-mounted display, it is preferable that the sizes of each pixel PX in the X-axis direction and the Y-axis direction are, for example, 24 μm or less, but it is not necessarily limited to this.

[0060] The backlight device 16 is arranged on the inner side of the liquid crystal panel 11. As Figure 3 shown, the backlight device 16 has a vertically long octagonal shape in a top view. The surface of the backlight device 16 faces the back surface of the liquid crystal panel 11, and the surface of the backlight device 16 is set as the light-emitting surface. The backlight device 16 emits light from the light-emitting surface to the liquid crystal panel 11. The central side portion of the light-emitting surface of the backlight device 16 becomes a light-emitting area EA that effectively emits light to the display area AA of the liquid crystal panel 11. The light-emitting area EA and the display area A face each other. The light-emitting area EA is arranged corresponding to a plurality of LEDs 17. Therefore, the light-emitting area EA can also be said to be an LED arrangement area (light source arrangement area) where the LEDs 17 are arranged. In addition, the backlight device 16 further includes an LED substrate on which the LEDs 17 are mounted, an optical member, a reflection sheet, and a base in addition to the LEDs 17.

[0061] The light-emitting area EA is formed in a vertically long octagonal shape in a top view so as to substantially follow the outer shape of the display area AA. The light-emitting area EA includes a plurality of light-emitting areas EA1 divided in the X-axis direction and the Y-axis direction. More specifically, the light-emitting area EA is equally divided in the X-axis direction and the Y-axis direction so that 24 light-emitting areas EA1 are included in one row of the longest part in the X-axis direction and 24 light-emitting areas EA1 are included in one column of the longest part in the Y-axis direction. In Figure 4 it, the area divided by a straight line L3 extending in the X-axis direction and a straight line L4 extending in the Y-axis direction is set as the light-emitting area EA1. Each light-emitting area EA1 is vertically long and square in a top view.

[0062] The areas of the light-emitting regions EA1 are the same as each other. In each light-emitting region EA1, two LEDs 17 are arranged at intervals in the Y-axis direction. That is, it can be said that each light-emitting region EA1 is a range where the light emitted from the two LEDs 17 is emitted to the outside. The total number of LEDs 17 provided in all the light-emitting regions EA1 is twice the total number of the light-emitting regions EA1.

[0063] As Figure 4 shown, each first display region AA1 and the corresponding light-emitting region EA1 face each other in substantially the entire region. Each second display region AA2 faces a part of the corresponding light-emitting region EA1. The part of each light-emitting region EA1 that does not face the corresponding second display region A2 faces the non-display region NAA. In addition, the first display region AA1 in design is set as the first default display region AAD1, and the second display region AA2 in design is set as the second default display region AAD2.

[0064] Figure 6 And Figure 7 in, the first default display region AAD1 and the second default display region AAD2 are represented by solid lines. In addition, the light-emitting region EA1 and the LEDs 17 are shown by double-dot dash lines. In Figure 7 in, among the pixels PX arranged in the first default display region AAD1 located in the upper right, the pixels PX that do not face the light-emitting region EA1 located in the upper right are taken as the first pixels PXl and are schematically shown. In addition, among the pixels PX not included in the first default display region AAD1 located in the upper right, the pixels PX that overlap with the light-emitting region EA1 located in the upper right are set as the second pixels PX2 and are schematically shown. In Figure 8 in, the first default display region AAD1 is a dotted line, and the first display region A1 is shown by a solid line.

[0065] The control circuit 18 is composed of a single chip. As Figure 5 shown, the control circuit 18 includes an image signal processing circuit 19, a gate driver 20 (display driver), a source driver 21 (display driver), a backlight control circuit 22 (lighting device control circuit), an LED driver 23 (light source driver), a correction circuit 24, an arithmetic circuit 25, and a memory 26. The correction circuit 24 is connected to the image signal processing circuit 19, the arithmetic circuit 25, and the memory 26. The backlight control circuit 22 is connected to the arithmetic circuit 25. The LED driver 23 is connected to the backlight control circuit 22 and the LEDs 17. The gate driver 20 and the source driver 21 are connected to the image signal processing circuit 19 and the liquid crystal panel 11.

[0066] After receiving the image signal from the host system, the image signal processing circuit 19 processes the image signal, inputs the processed image signal into the gate driver 20 and the source driver 21, and inputs it into the backlight control circuit 22 via the correction circuit 24 and the arithmetic circuit 25. The gate driver 20 inputs a scan signal based on the signal from the image signal processing circuit 19 into the gate electrode 14A via the gate wiring 12. The source driver 21 inputs an image signal based on the signal from the image signal processing circuit 19 into the source electrode 14B via the source wiring 13. When the scan signal is input to the gate electrode 14A, the TFT 14 is driven, and the image signal input to the source electrode 14B is transmitted to the drain electrode 14C via the channel region 14D, and the pixel electrode 15 connected to the drain electrode 14C becomes a potential based on the image signal.

[0067] The image signal processed by the image signal processing circuit 19 includes data representing the brightness required for display in the first display area AA1 and the second display area AA2. The backlight control circuit 22 can adjust the light emission amount of the LEDs 17 disposed in the light emission area EA1 based on this data. That is, the light emission amount of the light emitted from the light emission area EA1 corresponding to the first display area AA1 and the second display area AA2 can be adjusted. It is possible to perform light amount control of the light irradiated to the first display area AA1 and the second display area AA2, that is, so-called local dimming control, and high contrast performance can be obtained.

[0068] The LED driver 23 turns on or off each LED 17 based on the control signal from the backlight control circuit 22. The LED driver 23 can appropriately adjust the light emission amount of the LED 17 by performing PWM (Pulse Width Modulation) dimming driving on the LED 17. This PWM dimming driving is a driving method in which the LED 17 blinks periodically and the time ratio between the lighting period and the extinguishing period changes.

[0069] Component parts of the liquid crystal display device 10 (especially component parts of the backlight device 16) sometimes have dimensional errors during their manufacturing process. In addition, assembly errors sometimes occur in the manufacturing process of the liquid crystal display device 10 (especially assembly errors that occur when assembling the liquid crystal panel 11 and the backlight device 16). Due to such errors, a deviation sometimes occurs between the first default display area AD1 and the second default display area AD2 of the liquid crystal panel 11 and the corresponding light emission area EA1 of the backlight device 16. In this case, the first default display area AAD1 and the second default display area AAD2 are not sufficiently illuminated, and the contrast performance may decrease.

[0070] Therefore, the liquid crystal display device 10 performs the following correction process: According to the position offset, correct the first default display area AAD1, set the first display area AA1 opposite to the light-emitting area EA1, correct the second default display area AAD2, and set the second display area AA2 opposite to the light-emitting area EA1. Hereinafter, the details of the correction process will be described.

[0071] In the memory 26, the position data of the pixels PX, the data indicating the row and column of the pixels PX associated with each first default display area AAD1 (hereinafter referred to as the first default pixel row and column data), and the data indicating the row and column of the pixels PX associated with the second default display area AAD2 (hereinafter referred to as the second default pixel row and column data) are stored. In addition, when a position offset occurs between the liquid crystal panel 11 and the backlight device 16, the memory 26 stores the position data including the X coordinate and Y coordinate of the pixels PX that are not opposite to the light-emitting area EA1 (hereinafter, referred to as non-opposite pixel data) and the data indicating the position offset direction and position offset amount of the first default display area AAD1 and the second default display area AAD2 relative to the light-emitting area EA1 (hereinafter, referred to as position offset data).

[0072] Perform a specified check, and generate non-opposite pixel data and position offset data according to the result. Specifically, first, determine whether there are pixels PX in the pixels PX included in the first default display area AAD1 and the second default display area AAD2 that are not opposite to the corresponding light-emitting area EA1. In some cases, generate non-opposite pixel data and store it in the memory 26. Then, based on the non-opposite pixel data, judge the position offset direction and position offset amount, generate position offset data indicating the position offset direction and position offset amount based on the judgment result, and store the position offset data in the memory 26. Based on this position offset data, perform Figure 9 the correction process shown.

[0073] For example, assume that Figure 6 and Figure 7 the position offsets shown occur. That is, the first default display area AAD1 and the second default display area AAD2 are offset by two columns of pixels PX in the +x axis direction and two columns of pixels PX in the +Y axis direction relative to the light-emitting area EA1.

[0074] The correction circuit 24 refers to the memory 26 (S1), and determines whether there is non-opposite pixel data (S2). Here, when no position offset occurs, there is no non-two-column pixel data in the memory 26 (no), so the correction circuit 24 does not perform correction and ends the correction process.

[0075] In some cases, in the memory 26, non-opposing pixel data indicating that in the pixel rows and columns respectively associated with the first default display area AAD1 and the second default display area AAD2, two columns of pixels PX and two rows of pixels PX do not face the light-emitting area EA1 are stored. In addition, position offset data indicating that the first default display area AAD1 is offset by two columns of pixels PX in the +X axis direction and two rows of pixels PX in the +Y axis direction with respect to the light-emitting area EA1 is stored in the memory 26.

[0076] Therefore, the correction circuit 24 corrects the first default display area AAD1 and the second default display area AAD2 based on the position deviation data, and sets the first display area AA1 and the second display area AA2. That is, the correction circuit 24 performs a correction process of setting the first display area AA1 and the second display area AA2 at positions where, for the first default display area AAD1, two columns of pixels PX are offset in the -x axis direction and two rows of pixels PX are offset in the -Y axis direction.

[0077] Specifically, for the pixel rows and columns included in the first default pixel row and column data, the correction circuit 24 selects the pixel rows and columns located at positions offset by two column amounts of pixels PX in the -x axis direction and two row amounts of pixels PX in the -Y axis direction, associates them with the first display area AA1, and generates first pixel row and column data (S3). In addition, for the pixel rows and columns included in the second default pixel row and column data, the correction circuit 24 selects the pixel rows and columns located at positions offset by two column amounts of pixels PX in the -x axis direction and two row amounts of pixels PX in the -Y axis direction, associates them with the second display area AA2, and creates second pixel row and column data (S6). Then, the correction circuit 24 stores the first pixel row and column data and the second pixel row and column data in the memory 26 (S4, S7).

[0078] Refer to Figures 7 to 9 Specifically illustrate the generation of the first pixel row and column data and the second pixel row and column data. For the sake of simplicity, here, refer to Figure 8 For the case of Figure 7 changing the upper-right first default display area AAD1 shown to the first display area AA1 is described. Figure 8 For convenience, one first default display area AAD1 and one first display area AA1 are shown. The actual number, row numbers, and column numbers of the pixels PX included in the first default display area AAD1 and the first display area AA1 are different from the actual ones. In addition, the row numbers (X1 to X3) and the serial numbers (Y1 to Y23) are added for illustration.

[0079] In the first default display area AAD1, pixels PX (first default pixel row and column data) of rows X1 to X10 and columns Y13 to Y22 are associated. Based on the position deviation data, the correction circuit 24 generates pixels PX of rows X3 to X12 and columns Y11 to Y20 to be associated with the first display area AA1 corresponding to the light emission area EA1 (S3), generates data for the first display area AA1 (first pixel row and column data), and stores it in the memory 26 (S4).

[0080] This process is performed for all the first default display areas AAD1, generating the first pixel row and column data and storing it in the memory 26. The correction circuit 24 determines whether the above step S3 has been performed for all the first default display areas AAD1 (S5). If the above step S3 has not been performed (No), the process returns to step S3.

[0081] If it has been performed (Yes), the same process is also performed for the second default display area AAD2 (S6), generating data (second pixel row and column data) representing the rows and columns of the pixels PX added on the second display area AA2, and storing it in the memory (S7). The correction circuit 24 determines whether the above step S6 has been performed for all the second default display areas AAD2 (S8). If it has not been performed (No), the process returns to step S6. If it has been performed (Yes), the correction circuit 24 ends the correction process.

[0082] The first display area AA1 and the second display area AA2 set through the above correction process are properly opposed to the light emission area EA1. Therefore, it is not easy for the amount of light irradiated to the first display area AA1 and the second display area AA2 to be excessive or insufficient. As a result, the reliability of improving the contrast performance is improved, and the display quality is excellent.

[0083] Image display in the display area AA composed of the first display area AA1 and the second display area AA2 set in the above correction process is performed as follows. First, the arithmetic circuit 25 performs an arithmetic process on the numerical values representing the brightness required for display in the first display area AA1 and the second display area AA2. If the arithmetic circuit 25 receives an image signal from the image signal processing circuit 19 through the correction circuit 24, it obtains the first pixel row and column data and the second pixel row and column data stored in the memory 26 during the correction process. The arithmetic circuit 25 calculates the numerical values representing the brightness of the first display area AA1 and the second display area AA2 required for display based on the image signal, the first pixel row and column data, and the second pixel row and column data. The arithmetic circuit 25 inputs the numerical values representing the calculated brightness into the backlight control circuit 22.

[0084] The backlight control circuit 22 controls the LED driver 23 according to the value representing the luminance input from the arithmetic circuit 25, and adjusts the light emission amount from the LED 17. Through the correction process of the correction circuit 24, the first display area AA1 and the second display area AA2 are properly opposed to the light emission area EA1. Therefore, even in a state where the liquid crystal panel 11 is physically deviated from the backlight device 16, that is, a state where the display area AA is deviated from the light emission area EA, it is possible to control the light amount of the light irradiating the first display area AA1 and the second display area AA2 as designed, and excellent display quality can be obtained.

[0085] In addition, the arithmetic circuit 25 may be directly connected to the image signal processing circuit 19 without passing through the correction circuit 24, and directly receive the image signal from the image signal processing circuit 19. In addition, the arithmetic circuit 25 may be connected to the memory 26. In this case, the arithmetic circuit 25 can directly obtain the first pixel row data and the second pixel row data stored in the memory 26 from the memory 26.

[0086] Next, a manufacturing method of the liquid crystal display device 10 will be described. The manufacturing method of the liquid crystal display device 10 includes an assembling process, a position deviation detection process, and a correction process.

[0087] In the assembling process, the liquid crystal panel 11 is mounted on the backlight device 16 to obtain the liquid crystal display device 10. In the liquid crystal display device 10, due to dimensional errors and assembling errors of the constituent components, it is possible to generate a position deviation between the first default display area AAD1 and the light emission area EA1, and between the second default display area AAD2 and the light emission area EA1.

[0088] If the above-mentioned position deviation occurs, among the pixels PX in each first default display area AAD1, there are included pixels PX opposed to the corresponding first light emission area EA1 and pixels PX not opposed (first pixels PX1). The same applies to the pixels PX in each second default display area AAD2. Among them, the first pixel PX is opposed to another first light emission area EA1, or is not opposed to any of the light emission areas EA1. Therefore, if the position data of the first pixel PX1 is acquired, it is possible to determine the position deviation direction and the position deviation amount of the first default display area AAD1 and the second default display area AAD2 with respect to the light emission area EA1.

[0089] In the position offset detection process, non-opposing pixel data indicating the position data of the X coordinate and Y coordinate of the first pixel PX1 in the display area AA is generated and stored in the memory 26. Next, based on the non-opposing pixel data, position offset data indicating the position offset direction and the position offset amount is created and stored in the memory 26. The storage of the non-opposing pixel data and the position offset data in the memory 26 can be performed by an operator related to the position offset detection process, or can be performed by an inspection device or its peripheral devices used in the position offset detection process. When a position offset as described above is detected in the inspection result in the position offset detection process, the correction process is then performed. In addition, when no position offset is detected, the correction process is not performed.

[0090] Describe the correction process performed when a position offset is detected. In the above position offset detection process, it is assumed that the position offsets shown in Figure 6 and Figure 7 are detected. That is, the first default display area AAD1 and the second default display area AAD2 are shifted by 2 columns of the pixel PX in the +x axis direction and 2 rows of the pixel PX in the +Y axis direction with respect to the light emitting area EA1.

[0091] In the correction process, as shown in Figure 8 , the first display area A1 is set at a position shifted by 2 columns of the pixel PX in the -X axis direction and 2 rows of the pixel PX in the -Y axis direction with respect to the first default display area AAD1. That is, the first display area AAl is set such that the upper end of the first display area AAl is adjacent to the lower end of the first pixel group composed of the first pixels PX1 arranged in the X axis direction, and the right end is adjacent to the left end of the second pixel group composed of the first pixels PX1 arranged in the Y axis direction. By setting the first display area AA1 in this way, the first display area AA1 does not include the first pixel PX1 but includes the second pixel PX2.

[0092] The first display area AA1 is composed of pixels PX opposite to the first light emitting area EA1, and the first display area AA1 is appropriately opposite to the light emitting area EA1. Such correction is performed for all the first default display areas AAD1 and the second default display areas AAD2, and all the first display areas AA1 and the second display areas AA2 are appropriately opposed to the light emitting area EA1. When observing the liquid crystal display device 10 in its thickness direction, the boundary line of the first display area AA1 coincides with the boundary line of the corresponding light emitting area EA1, and the boundary line of the second display area AA2 coincides with the boundary line of the corresponding light emitting area EA1.

[0093] In addition, since the positions of the outer edges of the display area AA remain unchanged, after the correction process, the number of pixels PX in the first display area AA1 and the second display area AA2 adjacent to the upper end and the right end of the display area AA is larger than the number of pixels PX in the first default display area AAD1 and the second default display area AAD2. That is, it substantially becomes larger than the areas of the first default display area AAD1 and the second default display area AAD2 corresponding to the areas of the first display area A1 and the second display area AA2. On the other hand, the number of pixels PX in the first display area AA1 and the second display area AA2 adjacent to the lower end and the left end of the display area AA is smaller than the number of pixels PX in the corresponding first default display area AAD1 and the second display area AAD2. That is to say, the areas of the first display area AA1 and the second display area AA2 are substantially smaller than the areas of the corresponding first default display area AAD1 and the second default display area AAD2.

[0094] As described above, when a positional deviation occurs between the liquid crystal panel 11 and the backlight device 16 in the assembly process, positional deviation data indicating the positional deviation direction and the positional deviation amount of the first default display area AAD1 and the second default display area AAD2 with respect to the light-emitting area EA1 is generated in the positional deviation detection process. And, in the correction process, the first display area AA1 and the second display area AA2 are reset based on the positional deviation data. The set first display area AA1 and second display area AA2 are properly opposed to the light-emitting area EA1. Therefore, even in a state where the liquid crystal panel 11 is physically deviated with respect to the backlight device 16, that is, in a state where the display area AA is deviated with respect to the light-emitting area EA, it is possible to perform light quantity control (local dimming) of the light irradiating the first display area AA1 and the second display area AA2 as designed. According to the above method, compared with the prior art, a liquid crystal display device 10 having more excellent contrast performance and display quality can be provided.

[0095] (Embodiment 2)

[0096] Refer to Figures 10 to 19 The liquid crystal display device 110 according to Embodiment 2 and its manufacturing method will be described. The liquid crystal display device 110 includes a liquid crystal panel 111, a backlight device 116, and a control circuit 118. In addition, a part of the configurations of the liquid crystal panel 111 and the control circuit 118 is the same as those of the liquid crystal panel 11 and the control circuit 18 in the above-described Embodiment 1. Therefore, repeated descriptions of the same structures, operations, and effects are omitted.

[0097] Such as Figure 10 And Figure 11As shown, the liquid crystal panel 111 has a display area AA, a non-display area NAA, and a preliminary display area RA. The preliminary display area RA is in the shape of an octagonal frame along the outer edge of the display area AA and is located between the display area AA and the non-display area NAA( Figure 10 and Figure 11 the lattice-like grid part in).

[0098] The preliminary display area RA does not belong to the display area AA in terms of design. In the preliminary display area RA, there are provided a gate wiring 12, a source wiring 13, a TFT 14, a pixel electrode 15, a color filter, a light-shielding part (refer to Figure 2 ), and a pixel PX. The pixel PX arranged in the preliminary display area RA becomes a dummy pixel that is not used for display in terms of design. However, as will be described later, when correcting the first default display area AAD1 and the second default display area AAD2 and associating the pixel PX arranged in the preliminary display area RA with the first display area AA1 or the second display area AA2, it is used for display. When no correction is performed, all the pixels PX arranged in the preliminary display area RA are driven to display a black image.

[0099] As Figure 12 shown, the control circuit 118 includes an image signal processing circuit 119, a gate driver 120 (display driver), a source driver 121 (display driver), a backlight control circuit 122 (lighting device control circuit), an LED driver 23 (light source driver), a correction circuit 124, an arithmetic circuit 125, and a memory 126. The correction circuit 124 is connected to the image signal processing circuit 119, the arithmetic circuit 125, the memory 126, the gate driver 120, and the source driver 121. The gate driver 120 and the source driver 121 are connected to the correction circuit 124 and the liquid crystal panel 111. The backlight control circuit 122 is connected to the arithmetic circuit 125 and the LED driver 23. The LED driver 23 is connected to the LED 117.

[0100] In the memory 126, the position data of the pixel PX, the first default pixel row and column data, and the second default pixel row and column data are stored. In addition, when a position shift occurs between the liquid crystal panel 111 and the backlight device 116, non-relative pixel data and position shift data are stored.

[0101] When the correction circuit 124 stores the non-opposite pixel data in the memory 126, the following correction process is performed: based on the position deviation data, the first default display area AAD1 is corrected to set the first display area AA1 opposite to the light-emitting area EA1, and the second default display area AAD2 is corrected to set the second display area AA2 opposite to the light-emitting area EA1. In this correction process, the pixels PX arranged in the preliminary display area RA are sometimes associated with the first display area AA1 and the second display area AA2.

[0102] In the liquid crystal display device 10 according to the first embodiment, the area of the first display area AA1 or the second display area AA2 adjacent to the lower end or the left end of the display area AA is substantially smaller than the areas of the first default display area AAD1 and the second default display area AAD2. However, in the liquid crystal display device 110 according to the present embodiment, by using the pixels PX arranged in the preliminary display area RA, the areas of the first display area AA1 and the second display area AA2 set in the correction process can be made the same as or larger than the areas of the first default display area AAD1 and the second default display area AAD2.

[0103] The correction circuit 124 inputs the image signal processed by the image signal processing circuit 119, the first pixel row and column data, and the second pixel row and column data to the arithmetic circuit 125. In addition, the correction circuit 124 drives the pixels PX included in the first pixel row and column data and the second pixel row and column data by the gate driver 120 and the source driver 121 to perform image display. That is, among the pixels PX arranged in the preliminary display area RA, the pixels PX marked in the first display area AA1 or the second display area AA2 are also used for image display.

[0104] According to the above, the area of the first display area AAl can be made equal to the area of the first default display area AAD1, and the area of the second display area AA2 can be made equal to the area of the second default display area AAD2. Therefore, better display quality can be obtained.

[0105] A specific description of the correction process is given. When a position shift occurs between the liquid crystal panel 111 and the backlight device 116, the non-opposite pixel data and the position shift data are stored in the memory 126. Therefore, the correction circuit 124 performs Figure 15 the correction process as shown.

[0106] For example, it is assumed that Figure 13 and Figure 14 the position shift shown is detected. That is, the first default display area AAD1 and the second default display area AAD2 are shifted two columns of pixels PX in the +x-axis direction and two columns of pixels PX in the +y-axis direction with respect to the light-emitting area EA1. In addition, inFigure 13 and Figure 14 In Figure 14 , the first default display area AAD1 and the second default display area AAD2 are represented by solid lines. In addition, the light-emitting area EA1 and the LED 17 are shown by a double-dashed line.

[0107] In Figure 13 In Figure 13 , the pixels PX in the first default display area AAD1 located on the upper side and not facing the upper light-emitting area EA1 are taken as the first pixels PX1 and schematically shown. In addition, among the pixels PX not included in the first default display area AAD1 located on the upper side, the pixels PX overlapping with the upper light-emitting area EA1 are taken as the second pixels PX2 and schematically shown.

[0108] In Figure 14 In Figure 14 , the pixels PX in the first default display area AAD1 located on the left side and not facing the left light-emitting area EA1 are taken as the first pixels PX1 and schematically shown. In addition, among the pixels PX not included in the first default display area AAD1 located on the left side, the pixels PX overlapping with the left light-emitting area EA1 are taken as the second pixels PX2 and schematically shown.

[0109] The correction circuit 124 refers to the memory 126 (S21) and determines whether there is non-facing pixel data (S22). Here, in the case where no position shift occurs, there is no non-two-column pixel data in the memory 126 (No), so the correction circuit 24 does not perform correction and ends the correction process.

[0110] In some cases (Yes), position shift data indicating that the first default display area AAD1 and the second default display area AAD2 are shifted by two columns of pixels PX in the +X axis direction and two rows of pixels PX in the +Y axis direction with respect to the light-emitting area EA1 is stored in the memory 126.

[0111] Therefore, the correction circuit 124 corrects the first default display area AAD1 and the second default display area AAD2 based on the position deviation data and sets the first display area AA1 and the second display area AA2. That is, the correction circuit 124 sets the first display area AA1 and the second display area AA2 at positions where the first default display area AAD1 is shifted by two columns of pixels PX in the -X axis direction and two rows of pixels PX in the -Y axis direction.

[0112] In addition, through the above setting, the correction circuit 124 obtains the position data of the pixels PX not disposed in both the first display area AA1 and the second display area AA2 and generates black display pixel data. These pixels PX are driven in such a way as to always display a black image based on the black display pixel data.

[0113] The correction circuit 124 will be specifically described. For the pixel rows and columns included in the first default pixel row and column data, the correction circuit 124 selects the pixel rows and columns that are offset by two column amounts of the pixel PX in the -x axis direction and by two row amounts of the pixel PX in the -Y axis direction, associates them with the first display area AA1, and generates the first pixel row and column data (S23). In addition, for the pixel rows and columns included in the second default pixel row and column data, the correction circuit 124 selects the pixel rows and columns at the position that is offset by two column amounts of the pixel PX in the -x axis direction and by two row amounts of the pixel PX in the -Y axis direction, associates them with the second display area AA2, and creates the second pixel row and column data (S26). Then, the correction circuit 124 stores the first pixel row and column data and the second pixel row and column data in the memory 126 (S24, S27).

[0114] Here, in Figure 14 a part of the pixel PX assigned to the first display area AA1 for which the left - hand first default display area AD1 is corrected and set is arranged in the preparatory display area RA as Figure 19 shown. In the present embodiment, these pixel PX are also marked on the first display area Al. In Embodiment 1, since there are no such pixel PX, the number of pixel PX marked in the above - mentioned first display area AA1 is smaller than the number of pixel PX marked in the corresponding first default display area AAD1, and the area of the first display area AA1 is substantially reduced. In this regard, in the present embodiment, since the number of pixel PX marked in the above - mentioned first display area AA1 is the same as the number of pixels marked in the first default display area AAD1, the area of the first display area AA1 can be made the same as the area of the first default display area AAD1.

[0115] Refer to Figures 13 to 17 to specifically describe the generation of the first pixel row and column data and the second pixel row and column data. For the sake of simplicity of description, here, refer to Figures 15 to 17 the case of the upper - side first default display area AAD1 for correction Figure 13 and the left - hand first default display area AAD1 for correction Figure 14 will be described. Figure 16 And Figure 17 For convenience, one first default display area AAD1 and the first display area AA1 are shown. The actual number of pixel PX, row numbers, and column numbers included in the first default display area AAD1 and the first display area AA1 are different from the actual ones. In addition, the row numbers (RX1~RX3, X1~X23, X101~X123) and serial numbers (RY1~RY3, Y1~Y36) are added for the purpose of explanation.

[0116] First, the case of the first default display area AAD1 on the upper side in the correction Figure 13 is described. In the first default display area AAD1, pixels PX (first default pixel row and column data) of rows X1 to X10 and columns Y21 to Y30 are associated.

[0117] Based on the position deviation data, the correction circuit 124 generates data of pixel rows and columns including pixels PX of rows X3 to X12 and columns Y19 to Y28, which are associated with the first display area AA1 corresponding to the light emission area EA1, generates the first pixel row and column data (S23), and stores it in the memory 126 (S24).

[0118] Here, pixels PX of rows X1 and X2 adjacent to the upper end of the first default display area AAD1 and columns Y21 to Y30 do not carry any first display area AA1 and are not used for image display. Therefore, the correction circuit 124 generates black display pixel data as the position data of these pixels PX (S29) and stores it in the memory 126 (S30).

[0119] Next, the case of the first default display area AAD1 on the left side in the correction Figure 15 is described. In the first default display area AAD1, Figure 17 pixel rows and columns including pixels PX of rows X101 to X110 and columns Y1 to Y10 are associated (first default pixel row and column data).

[0120] Based on the position deviation data, the correction circuit 24 generates pixel rows and columns including pixels PX of rows X103 to X112 and columns RY2 to Y8, which are associated with the first display area AA1 corresponding to the light emission area EA1 (S23), generates the first pixel row and column data representing the rows and columns of pixels PX associated with the first display area AA1, and stores it in the memory 126 (S24).

[0121] Here, pixels PX of rows X103 to X112, columns RY2, and RY3 adjacent to the left end of the first default display area AAD1 are arranged in the preliminary display area RA. In Embodiment 1, since there are no such pixels PX, the first display area AA1 is only associated with pixels PX of rows X103 to X112 and columns Y1 to Y8, and the substantial area (area) is smaller than the corresponding first default display area AAD1.

[0122] In the present embodiment, since pixels PX arranged in the preliminary display area RA are also associated with the first display area AA1, the same number of pixels as those associated with the corresponding first default display area AAD1 are associated. Therefore, the substantial area (area) is the same as that of the corresponding first default display area AAD1.

[0123] For all the first default display areas AAD1, the correction circuit 124 and the above-mentioned step S23 are performed, and the first pixel row-column data of all the first display areas AA1 are stored in the memory 126. The correction circuit 124 determines whether the above-mentioned step S23 (S25) has been performed for all the first default display areas AAD1. If the above-mentioned step S23 has not been performed (No), the process returns to step S23.

[0124] If it has been performed (Yes), the same process is also performed for the second default display area AAD2 (S26), data representing the rows and columns of the pixels PX added to the second display area AA2 (second pixel row-column data) is generated, and is stored in the memory 126 (S27). The correction circuit 124 determines whether the above-mentioned step S26 (S28) has been performed for all the second default display areas AAD2. If it has not been performed (No), the process returns to step S36. If it has been performed (Yes), the correction circuit 124 generates black display pixel data representing the pixels PX not associated with the first display area AA1 and the second display area AA2, stores it in the memory 126 (S30), and ends the correction process.

[0125] The correction circuit 124 inputs the first pixel row-column data, the second pixel row-column data, the video signal, etc. to the arithmetic circuit 125. The arithmetic circuit 125 calculates values representing the brightnesses of the required first display area AA1 and second display area AA2 based on the input data and the video signal. The arithmetic circuit 125 inputs the data containing the calculated values to the backlight control circuit 122.

[0126] The backlight control circuit 122 controls the light emission amount of the light emission area EA1 according to the input from the arithmetic circuit 125. In this way, light amounts suitable for their respective brightnesses are supplied from the plurality of divided light emission areas EA1 to the first display area AA1 and the second display area AA2 respectively, and it is difficult for the light amounts irradiated from the respective divided light emission areas EA1 corresponding to the first display area AA1 and the second display area AA2 to be excessive or insufficient. Through the above, while appropriately performing local dimming control, the reliability of improving the contrast performance becomes higher, and excellent display quality can be obtained.

[0127] In addition, the correction circuit 124 inputs the first pixel row-column data, the second pixel row-column data, the black display pixel data, and the video signal from the video signal processing circuit 119 to the gate driver 120 and the source driver 121. The gate driver 120 and the source driver 121 drive the pixels PX included in the first pixel row-column data and the second pixel row-column data based on the input data and the video signal, and perform image display.

[0128] In addition, the gate driver 120 and the source driver 121 cause the pixels PX included in the black display pixel data to always display a black image regardless of the video signal. In addition, in Figure 18 and Figure 19 , the range where the black image is displayed is illustrated as a dot pattern grid.

[0129] According to the above configuration, the first display area AA1 and the second display area AA2 are appropriately opposed to the light-emitting area EA1. In addition, the areas of the first display area AA1 and the second display area AA2 can be the same as or larger than the areas of the first default display area AD1 and the second display area AD2. Moreover, the pixels PX that are not used in image display can always display a black image regardless of the video signal. As a result, the display quality of the images displayed in each of the first display area AA1 and the second display area AA2 is more excellent.

[0130] In addition, the arithmetic circuit 125 can also be directly connected to the video signal processing circuit 119 to form a configuration that directly inputs the processed video signal. In addition, the arithmetic circuit 125 can also be connected to the memory 126. In this case, the arithmetic circuit 125 can directly obtain the first pixel row data and the second pixel row data from the memory 26.

[0131] Next, a manufacturing method of the liquid crystal display device 110 will be described. In addition, regarding the assembly process, it is the same as that of the liquid crystal display device 10 of the first embodiment, so the position deviation detection process and the correction process will be described. To simplify the description, here, it is assumed that Figure 13 and Figure 14 the position deviation shown occurs. That is, the first default display area AAD1 and the second default display area AAD2 are shifted by two columns of the pixel PX in the +x-axis direction and two columns of the pixel PX in the +Y-axis direction with respect to the light-emitting area EA1.

[0132] In the position deviation detection process, it is determined whether there are pixels PX in the pixels PX included in the first default display area AAD1 and the second default display area AAD2 that are not opposed to the corresponding light-emitting area EA1. In some cases, non-opposing pixel data of the position data of the X coordinate and the Y coordinate of the first pixel PX1 in the display area AA is generated, and the non-opposing pixel data is stored in the memory 126.

[0133] Next, based on the non-opposing pixel data, the position offset direction and the position offset amount are determined. Position offset data representing the position offset direction and the position offset amount is generated and stored in the memory 126. The storage of the non-opposing pixel data in the memory 126 can be performed by an operator related to the position offset detection process, or can be performed by an inspection device or its peripheral equipment used in the position offset detection process. When the inspection result in the position offset detection process detects the above-mentioned position offset, the correction process is then performed. In addition, when no position offset is detected, the correction process is not performed.

[0134] To generate Figure 13 and Figure 14 Taking the case of the position offset shown as an example, the correction process will be described. The non-opposing pixel data stored in the memory 126 indicates that two columns of pixels PX and two rows of pixels PX do not face the light-emitting area EA1. In addition, the position offset data indicates that with respect to the light-emitting area EA1, the first default display area AAD1 is offset by two columns of pixels PX in the +X axis direction and by two rows of pixels PX in the +Y axis direction.

[0135] In the correction process, the first display area A1 is set at a position offset by two columns of pixels PX in the -X axis direction and by two rows of pixels PX in the -Y axis direction with respect to the first default display area AAD1. Here, close to Figure 13 and Figure 14 a part of the light-emitting area EA1 of the hypotenuse end between the left end and the upper end of the liquid crystal panel 111 close to the left end is opposed to the preliminary display area RA. That is, a part of the second pixel PX2 among the pixels PX not included in the first default display area AAD1 or the second default display area AAD2 and opposed to the above-mentioned light-emitting area EA1 is arranged in the preliminary display area RA. The first pixel PX1 and the second pixel PX2 other than this are both arranged in the display area AA.

[0136] Therefore, when the first default display area AAD1 and the second default display area AAD2 are corrected as described above, in the set first display area AA1 and second display area AA2, the first display area AA1 and the second display area AA2 close to the hypotenuse end between the left end and the upper end of the liquid crystal panel 111 include the pixels PX arranged in the display area AA and the pixels PX arranged in the preliminary display area RA. That is, each first display area Al includes the same number of pixels PX as each first default display area AAD1. Each second display area AA2 includes the same number of pixels PX as each second default display area AAD2.

[0137] In Embodiment 1, when the above-described correction is performed, the number of pixels PX included in the first display area AA1 becomes smaller than the number of pixels PX included in the corresponding first pixel row and column data. The same applies to the second display area AA2. In the present embodiment, the number of pixels PX included in the first display area AA1 is the same as the number of pixels PX arranged in the corresponding first default display area AAD1. The same applies to the second display area AA2. Therefore, more excellent display quality can be obtained.

[0138] In addition, in the first display area AA1 of the first display area AAl set in the correction process, which is close to the upper end of the liquid crystal panel 111, the first pixel PX1 close to the upper end is not included. That is, the first pixel PX1 close to the upper end among the pixels PX in the display area AA in the design is not included in the display area AA composed of the set first display area AA1 and the second display area AA2. In the correction process, black display pixel data as the position data of the pixels PX not included in such a display area AA is created and stored in the memory 126. The pixels PX included in the display pixel data are driven to always display a black image regardless of the video signal.

[0139] According to the above manufacturing method, based on the position offset data, the newly set first display area AA1 and the second display area AA2 can be made to face the light-emitting area EA1 appropriately. Therefore, even in a state where the liquid crystal panel 11 is physically deviated from the backlight device 116, that is, in a state where the display area AA is deviated from the light-emitting area EA, the light quantity control (local dimming) of the light irradiating the first display area AA1 and the second display area AA2 can be performed as designed. Compared with the prior art, a liquid crystal display device 110 with more excellent contrast performance and display quality can be provided.

[0140] In addition, the pixels PX arranged in the preliminary display area RA are also included in the newly set first display area AA1 and the second display area AA2. Therefore, the number of pixels PX actually used for image display can be equal to the number of pixels in the design. Therefore, compared with Embodiment 1, the liquid crystal display device 110 according to the present embodiment can improve the contrast performance and obtain more excellent display quality.

[0141] In addition, since the black display pixel data is stored in the memory 126, a black image can be displayed in the pixels PX not used in the actual image display, and more excellent display quality can be obtained.

[0142] (Embodiment 3)

[0143] Refer to Figures 20 to 24The brightness uniformity process and the position offset detection process included in the liquid crystal display device 210 and its manufacturing method according to Embodiment 3 will be described. Duplicate descriptions of the same structures, operations, and effects as those in Embodiment 2 above will be omitted.

[0144] As Figure 20 shown, the liquid crystal display device 210 includes a liquid crystal panel 211, a backlight device 216, and a control circuit 218. The backlight device 216 includes a plurality of LEDs 217. The control circuit 218 includes an image signal processing circuit 219, a gate driver 220 (display driver), a source driver 221 (display driver), a backlight control circuit 222 (lighting device control circuit), an LED driver 23 (light source driver), a correction circuit 224, an arithmetic circuit 125, and a memory 226.

[0145] The correction circuit 224 is connected to the image signal processing circuit 219, the arithmetic circuit 125, the memory 126, the gate driver 120, and the source driver 121. The gate driver 220 and the source driver 221 are connected to the correction circuit 224 and the liquid crystal panel 211. The backlight control circuit 222 is connected to the arithmetic circuit 125 and the LED driver 23. The LED driver 23 is connected to the LEDs 217.

[0146] In the liquid crystal display device 210, before performing the Figure 9 correction process shown, a brightness uniformity process and a position offset detection process are first performed. First, the brightness uniformity process will be described.

[0147] The backlight control circuit 222 controls the LED driver 23 to turn on all the LEDs 217, making the entire first display area AA1 and second display area AA2 of the liquid crystal panel 211 white display. The brightness of the first display area AA1 and the second display area AA2 is measured by an external device connected to the control circuit 218. The first display area AA1 and the second display area AA2 with a brightness higher than a specified value are determined by the external device, and first brightness correction data including these position data is generated. In addition, the first display area AA1 and the second display area AA2 with a brightness lower than the specified value are specified, and second brightness correction data is generated.

[0148] The control circuit 218 receives the first and second brightness correction data from the external device, drives the LED driver 23, reduces the light emission amount of the corresponding LEDs 217 according to the first brightness correction data, and increases the light emission amount of the corresponding LEDs 217 according to the second brightness correction data. As a result, the brightness of the display area AA of the liquid crystal panel 211 is made uniform. By performing the brightness uniformity process, the detection accuracy of the subsequent position deviation detection process can be improved compared to the case where the brightness uniformity process is not performed.

[0149] Stored in the memory 226 is the specified light-emitting area data representing the light-emitting area EA1 where light is emitted through the position offset detection process. In addition, stored in the memory 226 is the specified display area data representing the first display area AA1 where light passes through in the position offset detection process.

[0150] The specified light-emitting area data includes the position data of the specified light-emitting areas EA1A, EA1B, EA1C, EA1D, EA1E, EA1F, EA1G, EA1H, EA1J, EA1K, EA1L, EA1M, EA1N, EA1P, EA1Q, EA1R, EA1S, EA1T, EA1U, EA1V, and EA1W that are specified to emit light through the position offset detection process.

[0151] Specified light-emitting area Based on the specified light-emitting area EA1A located in the middle of the light-emitting area EA, positions are set in the up, down, left, right, upper right, upper left, lower right, and lower left directions. Therefore, the middle specified light-emitting area EA1A is set as the reference light-emitting area EA1A. The specified light-emitting areas other than the reference light-emitting area EA1A Based on the reference light-emitting area EA1A, for the first direction XY1 and the second direction XY2 that are inclined with respect to the X-axis direction, Y-axis direction, X-axis direction and Y-axis direction, every three light-emitting areas EA1 are selected and specified as the specified light-emitting areas In addition, the selected light-emitting areas EA1 are not limited to every three. It can also be at intervals of every 1, 2, 4, or more.

[0152] In this embodiment, for example, the four specified light-emitting areas EA1B, EA1E, EA1H, and EA1L located above, below, left, and right of the reference light-emitting area EA1 are at the same distance from the reference light-emitting area EA1. In addition, the four specified light-emitting areas EA1C, EA1F, EA1J, and EA1M are located at positions outside the specified light-emitting areas EA1B, EA1E, EA1H, and EA1L and at the same distance from the reference light-emitting area EA1A.

[0153] The backlight control circuit 222 controls the LED driver 23 to turn on the LEDs 217 corresponding to the specified light-emitting areas and emit light from the specified light-emitting areas emit. In addition, in Figure 21 the specified light-emitting areas are represented in white, and the other light-emitting areas EA1 are represented by a dotted pattern grid.

[0154] The specified display area data includes those corresponding to the specified light-emitting areas The corresponding first default display area AAD1 and the position data of the specified display areas AA1A, AA1B, AA1C, AA1D, AA1E, AA1F, AA1G, AA1H, AA1J, AA1K, AA1L, AA1M, AA1N, AA1P, AA1Q, AA1R, AA1S, AA1T, AA1U, AA1V, and AA1W used in the position deviation detection process. In addition, since the specified display area AA1A is located at the center of the display area AA and corresponds to the reference light-emitting area EA1A, it is set as the reference display area AA1A.

[0155] Regarding the specific setting method of the specified display area it will be described below with reference to Figure 22 and Figure 23 as follows.

[0156] The specified display area AA1B selects the pixel row and column at a position where the pixel PX is offset by three columns in the +X axis direction with respect to the pixel row and column in the first default display area AAD1 that is the third one starting from the reference display area AA1A in the +X axis direction ( Figure 22 the right side in ), and sets the range where this pixel row and column are arranged as the specified display area AA1B.

[0157] The specified display area AA1C selects the pixel row and column at a position where the pixel PX is offset by six columns in the +X axis direction with respect to the pixel row and column in the first default display area AAD1 that is the sixth one starting from the reference display area AA1A in the +X axis direction, and sets the range where this pixel row and column are arranged as the specified display area AA1C.

[0158] The specified display area AA1D selects the pixel row and column at a position where the pixel PX is offset by nine columns in the +X axis direction with respect to the pixel row and column in the first default display area AAD1 that is the ninth one starting from the reference display area AA1A in the +X axis direction, and sets the range where this pixel row and column are arranged as the specified display area AA1D.

[0159] The specified display area AA1E selects the pixel row and column at a position where the pixel PX is offset by three columns in the +Y axis direction with respect to the pixel row and column in the first default display area AAD1 that is the third one starting from the reference display area AA1A in the +Y axis direction ( Figure 22 the upper side in ), and sets the range where this pixel row and column are arranged as the specified display area AA1E.

[0160] The designated display area AA1F selects pixel rows and columns that are offset by six columns of pixels PX in the +Y axis direction relative to the pixel rows and columns configured in the first default display area AAD1, which is the sixth pixel row and column in the +Y axis direction from the reference display area AA1A, and sets the range in which the pixel rows and columns are configured as the designated display area AA1F.

[0161] The designated display area AA1G selects pixel rows and columns that are offset by nine columns of pixel PX in the +Y axis direction relative to the pixel rows and columns configured in the first default display area AAD1, which is the ninth pixel row and column in the +Y axis direction from the reference display area AA1A, and sets the range in which the pixel rows and columns are configured as the designated display area AA1G.

[0162] The designated display area AA1H is arranged in the direction from the reference display area AA1A to the −X axis direction ( Figure 22 From the pixel rows and columns in the third first default display area AAD1 (on the left side of the figure), select the pixel rows and columns that are offset by three rows of pixels in the -X axis direction, and set the range in which the pixel rows and columns are configured as the designated display area AA1H.

[0163] The designated display area AA1J selects pixel rows and columns that are offset by six rows of pixels in the -X axis direction relative to the pixel rows and columns configured in the first default display area AAD1, which is the sixth pixel row and column in the -X axis direction from the reference display area AA1A, and sets the range where the pixel rows and columns are configured as the designated display area AA1J.

[0164] The designated display area AA1K selects pixel rows and columns that are offset by nine pixel rows in the -X axis direction relative to the pixel rows and columns configured in the first default display area AAD1, which is the ninth pixel row in the -X axis direction from the reference display area AA1A, and sets the range where the pixel rows and columns are configured as the designated display area AA1K.

[0165] The designated display area AA1L is arranged in the direction of −Y axis ( Figure 22 From the pixel rows and columns in the third first default display area AAD1 (in the lower side), select the pixel rows and columns that are offset by three rows of pixels in the -Y axis direction, and set the range in which the pixel rows and columns are configured as the designated display area AA1L.

[0166] The designated display area AA1M selects pixel rows and columns that are offset by six rows of pixels in the -Y axis direction relative to the pixel rows and columns configured in the first default display area AAD1, which is the sixth pixel row and column in the -Y axis direction from the reference display area AA1A, and sets the range where the pixel rows and columns are configured as the designated display area AA1M.

[0167] The specified display area AA1N is selected with respect to the pixel rows and columns in the first default display area AAD1 that is the ninth in the -Y axis direction starting from the reference display area AA1A. The pixel rows and columns at a position where the pixels are offset by nine rows in the -Y axis direction are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1N.

[0168] The specified display area AA1P is relative to the pixel rows and columns arranged in the first default display area AAD1 that is the third in the +X axis direction and the third in the +Y axis direction (in Figure 22 it, the third from the upper right along the first direction XY1 starting from the reference display area AA1A). The pixel rows and columns at a position where the pixels are offset by PX columns in the +X axis direction and three rows in the +Y axis direction are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1P.

[0169] The specified display area AA1Q is relative to the pixel rows and columns arranged in the first default display area AAD1 that is the sixth in the +X axis direction and the sixth in the +Y axis direction (in Figure 22 it, the sixth from the upper right along the first direction XY1 starting from the reference display area AA1A). The pixel rows and columns at a position where the pixels are offset by PX columns in the +X axis direction and six rows in the +Y axis direction are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1Q.

[0170] The specified display area AA1R is relative to the pixel rows and columns arranged in the first default display area AAD1 that is the third in the -X axis direction and the third in the +Y axis direction (in Figure 22 it, the third from the upper left along the second direction XY2 starting from the reference display area AA1A). The pixel rows and columns at a position where the pixels are offset by PX columns in the -X axis direction and three rows in the +Y axis direction are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1R.

[0171] The specified display area AA1S is relative to the pixel rows and columns arranged in the first default display area AAD1 that is the sixth in the -X axis direction and the sixth in the +Y axis direction (in Figure 22 it, the sixth from the upper left along the second direction XY2 starting from the reference display area AA1A). The pixel rows and columns at a position where the pixels are offset by PX columns in the -X axis direction and six rows in the +Y axis direction are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1S.

[0172] The specified display area AA1T is relative to the pixel rows and columns arranged in the first default display area AAD1 that is the third in the -X axis direction and the third in the -Y axis direction (inFigure 22 Among them, for the pixel rows and columns arranged in the first default display area AAD1 which is the third from the bottom left along the second direction XY2 starting from the reference display area AA1A, select the pixel rows and columns at positions where the pixels PX are staggered by three columns in the -X axis direction and three rows in the -Y axis direction, and set the range where these pixel rows and columns are arranged as the specified display area AA1T.

[0173] The specified display area AA1U is relative to the sixth along the -X axis direction and the sixth along the -Y axis direction starting from the reference display area AA1A (the sixth from the bottom left along the second direction XY2 starting from the reference display area AA1A). Figure 22 Among them, for the pixel rows and columns arranged in the first default display area AAD1 which is the sixth from the bottom left along the second direction XY2 starting from the reference display area AA1A, select the pixel rows and columns at positions where the pixels PX are staggered by six columns in the -X axis direction and six rows in the -Y axis direction, and set the range where these pixel rows and columns are arranged as the specified display area AA1U.

[0174] The specified display area AA1V is relative to the third along the +X axis direction and the third along the -Y axis direction starting from the reference display area AA1A (the third from the bottom right along the first direction XY1 starting from the reference display area AA1A). Figure 22 Among them, for the pixel rows and columns arranged in the first default display area AAD1 which is the third from the bottom right along the first direction XY1 starting from the reference display area AA1A, select the pixel rows and columns at positions where the pixels PX are staggered by three columns in the +X axis direction and three rows in the -Y axis direction, and set the range where these pixel rows and columns are arranged as the specified display area AA1V.

[0175] The specified display area AA1W is relative to the sixth along the +X axis direction and the sixth along the -Y axis direction starting from the reference display area AA1A (the sixth from the bottom right along the first direction XY1 starting from the reference display area AA1A). Figure 22 Among them, for the pixel rows and columns arranged in the first default display area AAD1 which is the sixth from the bottom right along the first direction XY1 starting from the reference display area AA1A, select the pixel rows and columns at positions where the pixels PX are staggered by six columns in the +X axis direction and six rows in the -Y axis direction, and set the range where these pixel rows and columns are arranged as the specified display area AA1W.

[0176] In addition, in the above settings, the specified light-emitting area Taking the reference light-emitting area EA1A as a reference, it is specified every 3, but it can also be every 1, or more than 4 intervals. Also, the same applies to the first default display area AAD1 which is the reference for setting the specified display area Regarding the setting of the pixel rows and columns included in the specified display area The number of pixel columns and pixel rows offset relative to the pixel rows and columns arranged in the first default display area AAD1 is not limited to the above settings.

[0177] Alternatively, it is also possible not to use the designated display areas AA1D, AA1G, AA1K, AA1N, AA1Q, AA1S, AA1U, and AA1W for position offset detection processing. Alternatively, it is also possible not to use the designated display areas AA1C, AA1F, AA1J, AA1M, AA1P, AA1R, AA1T, and AA1V for position offset detection processing.

[0178] Alternatively, the light emitting area even further outside can be set as the designated light emitting area used in the position detection processing. In this case, it is also possible not to use the designated light emitting areas EA1D, EA1G, EA1K, EA1N, EA1Q, EA1S, EA1U, and EA1W. Alternatively, it is also possible not to use the designated light emitting areas EA1C, EA1F, EA1J, EA1M, EA1P, EA1R, EA1T, and EA1V.

[0179] The backlight control circuit 222 controls the LED driver 23 to turn on the LEDs 217 corresponding to the reference light emitting area EA1A and the designated light emitting area so that they emit light from the reference light emitting area EA1A and the designated light emitting area In this state, the gate driver 220 and the source driver 221 drive the pixels in the reference display area AA1A and the designated display area so that light passes through the reference display area AA1A and the designated display area

[0180] Through an external device, the transmitted light amounts of the reference display area AA1A and the designated display areas AA1B to AA1W are measured, the designated display area with the largest transmitted light amount is determined among the reference display area AA1A and the designated display areas AA1B to AA1W, and the determination result is sent to the control circuit 218.

[0181] The correction circuit 224 determines the position offset amount based on the number of pixel rows or columns not included in the corresponding first default display area AAD1 among the pixels included in the area with the largest transmitted light amount, determines the position offset direction based on which direction the above pixels are located relative to the first default display area AAD1, generates position offset data representing the position offset direction and the position offset amount, and stores it in the memory 226.

[0182] For example, assume that a position offset as shown in Figure 24 occurs between the light emitting area EA1 and the first default display area AAD1. That is, the designated light emitting area EA1P coincides with the designated display area AA1P. In this case, the light passing through the designated display area AA1P is close to the set value.

[0183] The designated display areas AA1B to AA1N, AA1Q to AA1W other than the designated light-emitting area EA1P do not coincide with the designated light-emitting areas EA1B to EA1N, EA1Q to EA1W. A part of the light emitted from the designated light-emitting areas EA1B to EA1N, EA1Q to EA1W cannot pass through the corresponding designated display areas AA1B to AA1N, AA1Q to AA1W, and the transmitted light amount is insufficient. The same applies to the reference display area A1A.

[0184] Therefore, the amount of transmitted light from the designated display area AA1P is the largest, and it is determined that the designated display area AA1P is the area with the largest transmitted light amount.

[0185] Refer to Figure 23 , the designated display area AA1P is an area including pixel rows and columns at a position that is offset by 3 column pixels PX in the +X-axis direction and 3 row pixels in the +Y-axis direction with respect to the corresponding first default display area AAD1. Therefore, position offset data equivalent to the position offset amounts of 3 column pixels and 3 row pixels and indicating the position offset direction along the + side of the first direction XY1 is generated.

[0186] Through the above-described brightness uniformity processing and position offset detection processing, correct position offset data indicating the position offset amount and the position offset direction can be generated. The correction circuit 224 can perform accurate correction processing based on the accurate position deviation data. The correction circuit 224 performs the same correction processing as the correction processing performed by the correction circuit 24 in Embodiment 1 based on the position offset data stored in the memory 226. Figure 9 The same correction processing as shown in

[0187] According to such a configuration, correction processing based on more correct position offset data can be performed. Even in a state where the liquid crystal panel 211 is physically deviated from the backlight device 216, that is, in a state where the display area AA is deviated from the light-emitting area EA, the light amount control (local dimming) of the light irradiating the first display area AA1 and the second display area AA2 can be performed as designed. Therefore, compared with the prior art, a liquid crystal display device 210 having more excellent contrast performance and display quality can be provided.

[0188] Next, a manufacturing method of the liquid crystal display device 210 will be described. The manufacturing method of the liquid crystal display device 210 includes an assembly process, a brightness uniformity process, a position offset detection process, and a correction process. In addition, since the correction process is the same as the correction process in Embodiment 1, the assembly process, the brightness uniformity process, and the position offset detection process will be described here.

[0189] In the assembly process, the liquid crystal panel 211 is mounted on the backlight device 216 to obtain the liquid crystal display device 210. In the liquid crystal display device 210, due to dimensional errors and assembly errors of the components, there may be a positional shift between the image signal processing circuit and the light-emitting area EA1, and between the second default display area AAD2 and the light-emitting area EA1. Therefore, after reducing the brightness unevenness in the display area AA of the liquid crystal panel 211 and achieving brightness uniformity, the positional shift is detected and correction processing is performed.

[0190] The brightness uniformity process will be described. First, all the LEDs 217 are turned on, and the entire first display area AA1 and the second display area AA2 of the liquid crystal panel 211 are white-displayed. That is, light is transmitted through the first display area AA1 and the second display area AA2. Next, the brightness of the first display area AA1 and the second display area AA2 is measured. The first display area AA1 and the second display area AA2 with brightness higher than the specified value are determined, and first brightness correction data including these position data is generated. In addition, the first display area AA1 and the second display area AA2 with brightness lower than the specified value are determined, and second brightness correction data including these position data is generated. Based on the first brightness correction data, the light emission amount of the corresponding LED 217 is reduced. Based on the second brightness correction data, the light emission amount of the corresponding LED 217 is increased. Thus, the brightness of the display area AA of the liquid crystal panel 211 is made uniform.

[0191] After the brightness uniformity process is completed, the positional shift detection process is performed. In the positional shift detection process, first, the light-emitting area EA1 located at the center of the light-emitting area EA is set as the reference light-emitting area EA1A. Based on the reference light-emitting area EA1A, for the X-axis direction, the Y-axis direction, and the first direction XY1 and the second direction XY2 which are inclined with respect to the X-axis direction and the Y-axis direction, every three light-emitting areas EA1 are selected, and the selected light-emitting areas EA1 are set as the designated light-emitting areas EA1B, EA1C, EA1D, EA1E, EA1F, EA1G, EA1H, EA1J, EA1K, EA1L, EA1M, EA1N, EA1P, EA1Q, EA1R, EA1S, EA1T, EA1U, EA1V, and EA1W.

[0192] Designated light-emitting area data including the position data of the reference light-emitting area EA1A and the designated light-emitting areas EA1B to EA1W is created and stored in the memory 226.

[0193] Set the specified display areas AA1A, AA1B, AA1C, AA1D, AA1E, AA1F, AA1G, AA1H, AA1J, AA1K, AA1L, AA1M, AA1N, AA1P, AA1Q, AA1R, AA1S, AA1T, AA1U, AA1V, and AA1W used in the position offset detection process corresponding to the specified light emission areas EA1A to EA1Y. In addition, since the specified display area AA1A is located in the middle of the display area AA and corresponds to the reference light emission area EA1A, it is set as the reference display area AA1A.

[0194] Regarding the specific setting method of the specified display area is as described above. Generate the specified display area data including the position data of the reference display area AA1A and the specified display area AA1W and store it in the memory 226.

[0195] Based on the specified light emission area data, turn on the LEDs 217 corresponding to the reference light emission area EA1A and the specified light emission areas EA1B to EA1W, and make light emit from the reference light emission area EA1A and the specified light emission areas EA1B to EA1W.

[0196] Based on the specified display area data, drive the pixels in the reference display area AA1A and the specified display area to make light pass through the reference display area AA1A and the specified display area

[0197] Measure the transmitted light amounts of the reference display area (AA1A) and the specified display areas (AA1B to AA1W), and determine the area with the largest transmitted light amount among the reference display area (AA1A) and the specified display areas (AA1B to AA1W). Save the determination result in the memory 226.

[0198] According to the above determination result, determine the position offset amount based on the number of rows or columns of the pixels PX that are not included in the corresponding first default display area AAD1 among the pixels PX included in the display area with the largest transmitted light amount among the reference display area AA1A and the specified display areas . In addition, determine the position offset direction according to which direction the above pixels PX are located relative to the first default display area AAD1. Generate the position offset data indicating the position offset direction and the position offset amount and store it in the memory 226.

[0199] Based on the position offset data stored in the above memory 226, perform the same correction process as in the correction process of Embodiment 1.

[0200] In the above manufacturing method, since the position deviation detection process is performed after the brightness uniformity improvement process, more accurate position deviation data can be produced, and a correction process based on the more accurate position deviation data can be performed. Even in a state where the liquid crystal panel 211 is physically deviated from the backlight device 216, that is, in a state where the display area AA is deviated from the light emission area EA, the light quantity control (local dimming) of the light irradiating the first display area AA1 and the second display area AA2 can be performed as designed. Therefore, compared with the prior art, a liquid crystal display device 210 with more excellent contrast performance and display quality can be provided.

[0201] In addition, this manufacturing method can also be applied to Embodiment 1.

[0202] <Other Embodiments>

[0203] The technology disclosed in this specification is not limited to the embodiments described according to the above description and the drawings. For example, embodiments such as the following are also included in the technical scope.

[0204] (1) In the position deviation detection process, the determination of the display area with the largest transmitted light quantity among the display areas AA1B to AA1W can be set and performed multiple times. For example, in the first setting where the display area AA1B is specified, for the pixel rows and columns included in the default pixel row and column data, the pixel rows and columns located at a position offset by three pixel columns PX are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1B. Then, the display area with the largest transmitted light quantity is determined. In the second setting, for the pixel rows and columns included in the default pixel row and column data, the pixel rows and columns located at a position offset by two pixel columns PX are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1B. Then, the display area with the largest transmitted light quantity can also be determined. The first and the second can be compared, and based on the setting with the larger transmitted light quantity, the position deviation direction and the position deviation amount can be determined, and position deviation data can be generated.

[0205] (2) For the above (1), the determination of the display area with the largest transmitted light quantity can also be performed for the third time. For example, in the third time, for the pixel rows and columns included in the default pixel row and column data, the pixel rows and columns located at a position offset by one pixel column PX are selected, and the range in which these pixel rows and columns are arranged is set as the specified display area AA1B. Then, the display area with the largest transmitted light quantity can also be determined. The second and the third can be compared, and based on the setting with the larger transmitted light quantity, the position deviation direction and the position deviation amount can be determined, and position deviation data can be generated. In addition, for other specified display areas the above-mentioned change of the setting of the specific display area can be similarly performed.

[0206] (3) The planar shapes of the first display region AA1 and the light-emitting region EA1 may also be horizontally long rectangles, squares, or the like.

[0207] (4) The number of rows and columns of the first display region AA1 and the number of rows and columns of the light-emitting region EA1 may be different.

[0208] (7) The number of LEDs included in one light-emitting region EA1 may be one or three or more.

[0209] (5) The control circuits 18 and 118 may not include the correction circuits 24 and 124. In this case, the correction circuits may be provided separately from the control circuits 18 and 118. For example, the correction circuits may be provided in the host system that is the supply source of the video signal.

[0210] (6) The control circuits 18 and 118 may not include the arithmetic circuits 25 and 125. For example, the backlight control circuits 22, 122, and 222 may have the functions of the arithmetic circuits 25 and 125. Additionally, the arithmetic circuits 25 and 125 may be provided separately from the control circuits 18 and 118.

[0211] ⑺ The gate drivers 20, 120, and 220, the source drivers 21, 121, and 221, and the LED driver 23 may also be provided separately from the control circuits 18 and 118.

[0212] (8) As the light source, in addition to the LEDs 17, 117, and 217, organic EL elements or the like can also be used.

[0213] (9) The outer shapes of the display region AA and the light-emitting region EA may also be square, trapezoidal, circular, elliptical, or the like.

[0214] (10) The outer shapes of the liquid crystal panels 11, 111, and 211 and the backlight devices 16 and 216 may also be square, trapezoidal, circular, elliptical, or the like.

[0215] (11) The liquid crystal display devices 10, 110, and 210 can also be used for applications other than head-mounted displays.

[0216] Description of Reference Numerals

[0217] 10, 110, 210... liquid crystal display device (display device); 11, 111, 211... liquid crystal panel (display panel); 16, 216... backlight device (lighting device); 18, 118, 218... control circuit; 19, 119... image signal processing circuit; 20, 120, 220... gate driver (display driver); 21, 121, 221... source driver (display driver); 22, 122, 222... backlight control circuit (lighting device control circuit); 24, 124, 224... correction circuit; 25, 125... arithmetic circuit; AA... display area; AA1... first display area; AA2... second display area; AA1A... reference display area; AA1B to AA1W... designated display areas; EA... light-emitting area; EA1... light-emitting area; EA1A... reference light-emitting area, ... designated light-emitting areas, PX... pixel, RA... preliminary display area.

Claims

1. A display device, characterized in that, Comprising: A lighting device, having a plurality of light sources and having a light-emitting area from which light emitted from the plurality of light sources exits, the light-emitting area having a plurality of light-emitting zones divided corresponding to the plurality of light sources; A display panel, which is mounted on the lighting device and has a display area and a non-display area, the display area facing the light-emitting area and displaying an image, the non-display area being located around the display area, the display panel further comprising a plurality of pixels arranged in a matrix in the display area, the display area having a plurality of display zones divided to face the plurality of light-emitting zones; A memory, which stores default pixel row-column data, the default pixel row-column data including position data of a plurality of pixel rows and columns formed by associating the plurality of pixels designed in the plurality of display zones, and stores non-facing pixel data and position offset data when a position offset occurs between the light-emitting area and the display area, the non-facing pixel data including position data of pixels that do not face the light-emitting area when the position offset occurs among the plurality of pixels, the position offset data including data representing a position offset direction and a displacement amount related to the position offset between a plurality of pixel rows and columns facing the plurality of light-emitting zones and the plurality of pixel rows and columns included in the default pixel row-column data when the position offset occurs; A correction circuit, which is connected to the memory, determines whether the non-facing pixel data is stored in the memory, and when it is stored, the correction circuit stores pixel row-column data in the memory, the pixel row-column data being pixel row-column data generated by newly associating, for each of the plurality of display zones, a plurality of pixel rows and columns formed by the plurality of pixels existing at positions offset only by the position offset amount in the position offset direction represented by the position offset data with respect to the plurality of pixel rows and columns included in the default pixel row-column data.

2. The display device according to claim 1, wherein The position offset data represents in which direction the plurality of pixel rows and columns included in the default pixel row-column data are offset by several rows and several columns of the plurality of pixels with respect to the plurality of pixel rows and columns facing the plurality of light-emitting zones.

3. The display device according to claim 1 or 2, characterized in that, It further comprises a display driver, which is connected to the display panel and displays the image in the plurality of display zones associated with the plurality of pixel rows and columns included in the pixel row-column data.

4. The display device according to claim 3, wherein: The display panel has a preliminary display area between the display area and the non-display area and comprises a plurality of pixels arranged in a matrix in the preliminary display area; The correction circuit generates pixel row-column data obtained by newly associating a plurality of pixel rows and columns with each of the plurality of display zones and stores the pixel row-column data in the memory; The plurality of pixel rows and columns are formed by the plurality of pixels arranged in the display area and the plurality of pixels arranged in the preliminary display area that exist at positions offset only by the position offset amount in the position offset direction represented by the position offset data.

5. The display device according to claim 3 or 4, characterized in that, further comprising an image signal processing circuit, which is connected to the correction circuit, receives the image signal related to the image displayed in the plurality of display areas, processes the image signal, and inputs the processed image signal to the display driver, the display driver receives the processed image signal and causes the plurality of display areas to display the image according to the image signal.

6. The display device according to claim 5, wherein, It further includes an arithmetic circuit, which is connected to the correction circuit, receives the pixel row and column data from the correction circuit, and calculates, for each of the plurality of display areas, a value representing the luminance necessary for displaying the image according to the pixel row and column data.

7. The display device according to claim 6, wherein The arithmetic circuit receives the processed image signal from the correction circuit and calculates, for each of the plurality of display areas, a value representing the luminance necessary for displaying the image based on the pixel row and column data and the processed image signal.

8. The display device according to claim 4, characterized in that, the correction circuit generates black display pixel data and stores it in the memory, and the black display pixel data includes the position data of the plurality of pixels not associated with the plurality of display areas; the display driver causes the plurality of pixels included in the black display pixel data to display a black image.

9. A method for manufacturing a display device, characterized in that, for an illumination device having a plurality of light sources and a light-emitting area for emitting light from the plurality of light sources, the light-emitting area is divided corresponding to the plurality of light sources, and a plurality of light-emitting areas are set, for a display panel having a display area for displaying an image and a non-display area around the display area, and having a plurality of pixels arranged in a matrix in the display area, the display area is divided to face the plurality of light-emitting areas, and a plurality of display areas are set; mount the display panel on the illumination device, take the plurality of display areas as a plurality of default display areas, and determine whether a position shift occurs between the plurality of pixel rows and columns formed by the plurality of pixels arranged in the plurality of default display areas and the plurality of light-emitting areas facing the plurality of pixel rows and columns, in the case where a position shift occurs, judge the position shift direction and position shift amount of the plurality of pixel matrices relative to the plurality of light-emitting areas, for the plurality of pixel rows and columns, set the area where the plurality of pixel rows and columns formed by the plurality of pixels existing at the positions only shifted by the position shift amount in the position shift direction are arranged as a new plurality of display areas.

10. The method for manufacturing a display device according to claim 9, characterized in that, before the determination of the position shift, turn on all the plurality of light sources and cause light to be transmitted from the plurality of display areas corresponding to the plurality of light-emitting areas, measure the luminance of each of the plurality of display areas; compare the luminance of each of the plurality of display areas with a specified value; determine the display areas having a luminance higher than the specified value and the display areas having a luminance lower than the specified value, Reduce the luminous flux of a plurality of the light sources corresponding to the light-emitting regions facing the display regions having a luminance higher than the specified value among the plurality of light-emitting regions; Increase the luminous flux of the plurality of light sources corresponding to the light-emitting regions facing the display regions having a luminance lower than the specified value, so as to make the luminance in the display region uniform.

11. The manufacturing method of the display device according to claim 10, wherein: Set the light-emitting region located at the center of the light-emitting region among the plurality of light-emitting regions as the reference light-emitting region; Set four light-emitting regions existing at the upper, lower, left, and right positions having the same distance from the reference light-emitting region with respect to the reference light-emitting region among the plurality of light-emitting regions as the designated light-emitting regions respectively; Select default display regions respectively facing the designated light-emitting regions from the plurality of default display regions; Set the designated display regions at positions where only a specified pixel amount is offset with respect to the pixel rows and columns of the pixels arranged in the selected default display regions; Turn on a plurality of the light sources corresponding to the designated light-emitting regions; Drive the plurality of pixels arranged in the designated display regions; Measure the amount of transmitted light from the designated display regions; Determine the designated display region with the largest amount of transmitted light; Determine the position offset direction and the position offset amount by judging in which direction and by how much the determined designated display region is offset with respect to the default display region corresponding to the determined designated display region.

12. The manufacturing method of the display device according to claim 11, wherein: Set four light-emitting regions existing at the upper, lower, left, and right positions having the same distance from the reference light-emitting region and located outside the four light-emitting regions with respect to the reference light-emitting region among the plurality of light-emitting regions as the designated light-emitting regions respectively; Select default display regions respectively facing the designated light-emitting regions from the plurality of default display regions; Set the designated display regions at positions where only a specified pixel amount is offset with respect to the pixel columns composed of the pixels arranged in the selected default display regions.

13. The manufacturing method of the display device according to claim 12, wherein: Set four light-emitting regions existing at the upper right, upper left, lower right, and lower left positions having the same distance from the reference light-emitting region among the plurality of light-emitting regions as the designated light-emitting regions respectively; Select default display regions respectively facing the designated light-emitting regions from the plurality of default display regions; Set the designated display regions at positions where only a specified pixel amount is offset with respect to the pixel rows and columns composed of the pixels arranged in the selected default display regions.

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