LCD projection display device and display method

Abstract

The application discloses an LCD projection display device and a display method. The display device adjusts light through two liquid crystal layers. The first liquid crystal layer controls the transmission or shielding of light according to the brightness information of an image, and the second liquid crystal layer controls the transmission or shielding of light according to the brightness value of a color signal. The first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity, so that the light emitted by the backlight source is shielded by the first liquid crystal layer for the first time, the accuracy of the light and dark degree of the light after the first shielding is improved, the light after the first shielding continues to be shielded by the second liquid crystal layer, and the accuracy of the light and dark degree of the light after the second shielding is further improved. The backlight switch is realized at the pixel point level, the pixel point for black display can reach the full black state, the pixel point for light display is normally transmitted, and therefore, a display image with higher contrast is realized, and the effect of improving the image contrast of adjacent areas is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of LCD projection device, and particularly relates to an LCD projection display device and a display method. BACKGROUND

[0002] The existing LCD projection mainly realizes the adjustment of contrast ratio through the adjustment of picture quality parameters or the mode of Local dimming (area backlight technology).

[0003] The adjustment of picture quality parameters mainly realizes the adjustment of image brightness, contrast ratio and backlight brightness and other picture quality related parameters, but essentially the LCD projection still scatters light, so that the heat dissipation cannot be completely shielded or blocked, the black place cannot be completely black, and the effect of the adjustment of picture quality parameters is general; and the adjustment mode of Local dimming is relatively complex in backlight control, and cannot realize the control of pixel points.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] In view of the defects of the prior art, the purpose of the present application is to provide an LCD projection display device and a display method, aiming at solving the problems of how to realize the display of image and how to improve the high contrast ratio of image.

[0006] The technical scheme of the present application is as follows:

[0007] In a first aspect, the present application provides an LCD projection display device, comprising:

[0008] a shell;

[0009] a backlight source arranged in the shell and used for emitting light;

[0010] a first polaroid arranged in the shell;

[0011] a first liquid crystal layer connected to the shell and used for controlling the transmission or shielding of light according to the brightness information of image;

[0012] a second polaroid arranged in the shell;

[0013] a second liquid crystal layer connected to the shell and used for controlling the transmission or shielding of light according to the color signal brightness value, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity;

[0014] a filter arranged in the shell;

[0015] a third polaroid arranged in the shell;

[0016] The backlight source is arranged opposite to the first polarizing plate, the first polarizing plate, the second polarizing plate, the filter and the third polarizing plate are sequentially distributed, the first liquid crystal layer is located between the first polarizing plate and the second polarizing plate, and the second liquid crystal layer is located between the second polarizing plate and the filter.

[0017] In an implementation manner,

[0018] The first driving structure and the second driving structure;

[0019] The first driving structure comprises:

[0020] The first positive electrode circuit board is connected with one side of the first liquid crystal layer;

[0021] The first negative electrode circuit board is connected with the other side of the first liquid crystal layer;

[0022] The second driving structure comprises:

[0023] The second positive electrode circuit board is connected with one side of the second liquid crystal layer;

[0024] The second negative electrode circuit board is connected with the other side of the second liquid crystal layer;

[0025] The first positive electrode circuit board, the first negative electrode circuit board, the second positive electrode circuit board and the second negative electrode circuit board are sequentially distributed, the first negative electrode circuit board is located on the side close to the second polarizing plate, and the second negative electrode circuit board is located on the side close to the third polarizing plate.

[0026] In an implementation manner, the display device further comprises:

[0027] The control chip is connected with the first liquid crystal layer and the second liquid crystal layer, and is used for collecting image information and calculating the first group of signals and the second group of signals according to the image information.

[0028] In an implementation manner, the display device further comprises:

[0029] The first glass substrate is laminatedly connected with the first positive electrode circuit board;

[0030] The second glass substrate is laminatedly connected with the first negative electrode circuit board;

[0031] The third glass substrate is laminatedly connected with the second positive electrode circuit board;

[0032] The fourth glass substrate is laminatedly connected with one side of the filter close to the third polarizing plate.

[0033] In an implementation, the first liquid crystal layer is a backlight control liquid crystal layer, and the second liquid crystal layer is an image display liquid crystal layer.

[0034] The backlight control liquid crystal layer is synchronously adjusted with the image display liquid crystal layer.

[0035] In a second aspect, the present application provides a display method of the LCD projection display device according to any one of the above, wherein the method comprises:

[0036] obtaining an image to be displayed;

[0037] determining respective bright-dark information of each pixel point in the image to be displayed;

[0038] determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the respective bright-dark information of each pixel point; wherein the first group of signals and the second group of signals are both low-voltage differential signals;

[0039] controlling the first liquid crystal layer to transmit or shield light according to the first group of signals, and synchronously controlling the second liquid crystal layer to transmit or shield light according to the second group of signals, to generate an image corresponding to the image to be displayed.

[0040] In an implementation, the bright-dark information of the pixel point comprises red-green-blue levels used to determine the brightness of the pixel point in the image to be displayed; the first group of signals comprises a pixel signal and a first group of brightness signals, and the second group of signals comprises a second group of brightness signals.

[0041] The determining of the first group of signals and the second group of signals corresponding to the image to be displayed according to the respective bright-dark information of each pixel point comprises:

[0042] determining a low-voltage differential signal corresponding to each pixel point according to the respective red-green-blue levels of each pixel point;

[0043] determining a pixel signal, a first group of brightness signals and a second group of brightness signals corresponding to the image to be displayed according to the low-voltage differential signals corresponding to each pixel point.

[0044] In an implementation, the bright-dark information of the pixel point further comprises coordinates used to determine the position of the pixel point in the image to be displayed.

[0045] The determining of the low-voltage differential signal corresponding to each pixel point according to the respective red-green-blue levels of each pixel point comprises:

[0046] determining the low-voltage differential signal corresponding to each pixel point according to the respective coordinates and the respective red-green-blue levels of each pixel point.

[0047] In an implementation, the image to be displayed comprises a first region and a second region adjacent to the first region; the first group of luminance signals and the second group of luminance signals each have a value range of 0 to 255;

[0048] The first liquid crystal layer is controlled to transmit or shield light according to the first group of signals, and the second liquid crystal layer is synchronously controlled to transmit or shield light according to the second group of signals, to generate an image corresponding to the image to be displayed, comprising:

[0049] When the first group of luminance signals and the second group of luminance signals in the first region are 0, the first driving structure is controlled to apply a voltage to the first liquid crystal layer to make the first liquid crystal layer completely shield the light of the backlight, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer to make the second liquid crystal layer completely shield the light of the backlight, to generate an image corresponding to the first region;

[0050] When the first group of luminance signals and the second group of luminance signals in the second region are 255, the first driving structure is controlled to apply a voltage to the first liquid crystal layer to make the first liquid crystal layer completely transmit the light of the backlight, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer to make the second liquid crystal layer completely transmit the light of the backlight, to generate an image corresponding to the second region;

[0051] According to the image corresponding to the first region and the image corresponding to the second region, an image corresponding to the image to be displayed is obtained, so that the image corresponding to the first region and the image corresponding to the second region do not affect each other.

[0052] In an implementation, the first liquid crystal layer is controlled to transmit or shield light according to the first group of signals, and the second liquid crystal layer is synchronously controlled to transmit or shield light according to the second group of signals, to generate an image corresponding to the image to be displayed, further comprising:

[0053] When the first group of luminance signals and the second group of luminance signals in the first region are 0, the first driving structure is controlled to apply a voltage to the first liquid crystal layer to make the first liquid crystal layer completely shield the light of the backlight, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer to make the second liquid crystal layer completely shield the light of the backlight, to generate an image corresponding to the first region;

[0054] When the first group of luminance signals and the second group of luminance signals in the second region are 125, the first driving structure is controlled to apply a voltage to the first liquid crystal layer to make the first liquid crystal layer partially shield the light of the backlight, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer to make the second liquid crystal layer partially shield the light of the backlight, to generate an image corresponding to the second region.

[0055] Beneficial effects: the LCD projection display device and display method provided by the application adjust light through two liquid crystal layers, the first liquid crystal layer controls the transmission or shielding of light according to the brightness information of an image, the second liquid crystal layer controls the transmission or shielding of light according to the brightness value of a color signal, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity, so that the light emitted by the backlight source is shielded for the first time through the first liquid crystal layer, the accuracy of the light and dark degree of the light after the first shielding is improved, the light after the first shielding continues to be shielded through the second liquid crystal layer, the accuracy of the light and dark degree of the light after the second shielding is further improved, the pixel point level backlight switch is realized, the pixel point of black display can reach the full black state, the pixel point of bright display is normally transmitted by the backlight, and thus a display image with higher contrast is realized, and the effect of improving the image contrast of adjacent regions is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 The flow chart of the LCD projection display method of the application is shown in the figure.

[0057] Figure 2 The projection structure schematic diagram of the LCD projection display device of the application is shown in the figure.

[0058] Figure 3 The architecture schematic diagram of the LCD projection display device of the application is shown in the figure.

[0059] Figure 4 The image signal control processing flow chart of the application is shown in the figure.

[0060] BRIEF DESCRIPTION OF DRAWINGS

[0061] 100-backlight source; 200-first liquid crystal layer; 300-second liquid crystal layer; 311-first polaroid; 312-first glass substrate; 313-first positive circuit board; 314-first negative circuit board; 315-second glass substrate; 320-second polaroid; 321-third glass substrate; 322-second positive circuit board; 323-second negative circuit board; 324-filter; 325-fourth glass substrate; and 326-third polaroid. DETAILED DESCRIPTION

[0062] The application provides an LCD projection display device and display method, in order to make the purpose, technical scheme and effect of the application more clear and explicit, the application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0063] It is to be noted that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or indirectly on the other component with intervening components. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component with intervening components.

[0064] It should be further noted that the same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0065] The existing LCD projection mainly adjusts the backlight to realize the adjustment of the image contrast, or through the LocalDimming mode, but the backlight control is complex, and the pixel point level control cannot be realized, and there is still some space to improve. Therefore, in the existing display scheme, the pixel point level control cannot be realized, and then a higher contrast cannot be achieved, and users cannot see more details.

[0066] In order to solve the above problems, the present application provides an LCD projection display device, which can make the black pixel point not transmit light by controlling the first liquid crystal layer (backlight control liquid crystal layer), so as to achieve real black, so as to make the contrast of the LCD projection higher, and output the best projection effect; as Figure 2 Or Figure 3 As shown, it comprises:

[0067] A shell (not shown in the figure);

[0068] A backlight 100 is arranged in the shell and used for emitting light;

[0069] A first polaroid 311 is arranged in the shell;

[0070] A first liquid crystal layer 200 is connected to the shell and used for controlling the transmission or shielding of light according to the brightness information of an image;

[0071] A second polaroid 320 is arranged in the shell;

[0072] A second liquid crystal layer 300 is connected to the shell and used for controlling the transmission or shielding of light according to the color signal brightness value, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity.

[0073] The filter 324 (i.e. a color filter) is arranged in the housing.

[0074] The third polarizer 326 is arranged in the housing.

[0075] The backlight 100 is arranged opposite to the first polarizer 311, the first polarizer 311, the second polarizer 320, the filter 324 and the third polarizer 326 are arranged in sequence, the first liquid crystal layer 200 is located between the first polarizer 311 and the second polarizer 320, and the second liquid crystal layer 300 is located between the second polarizer 320 and the filter 324.

[0076] The present application is a double liquid crystal layer controlled LCD projection, which can not change the original whole projection device light path layout, according to image information, through the processing of the image signal by the main chip, outputting two groups of LVDS signals (Low-Voltage Differential Signaling, low voltage differential signal), one group of LVDS signals is used for image display, and the other group of LVDS signals is only used for outputting brightness signal and is used for controlling the backlight control liquid crystal layer, realizing the pixel point level backlight switch, so that the pixel point of black display can reach the full black state, and the pixel point of bright display is normally transmitted by the backlight, so that the super high contrast is realized. It should be noted that the first group of low-voltage differential signals includes the brightness information of the image, and the second group of low-voltage differential signals includes the R, G and B color signal brightness values.

[0077] It should be noted that the brightness of the white light emitted by the backlight 100 towards the side of the first polarizer 311 is consistent, the parameters and structures of the first polarizer 311, the second polarizer 320 and the third polarizer 326 are the same (consistent in size and thickness), the first liquid crystal layer 200 and the second liquid crystal layer 300 both contain liquid crystal molecules, the direction of the liquid crystal molecules has a certain regularity, when the two sides of the liquid crystal layer are powered on, the liquid crystal molecules are arranged in order, so that the light is easy to pass through, when the power is off, the liquid crystal molecules are arranged in disorder, and the light is prevented from passing through; the power supply under the on-off control will affect the light transmittance or reflectivity of the liquid crystal unit, so as to control the transmission or shielding function of the light source, so as to control each pixel point to generate an image with different gray levels and colors.

[0078] Taking the area of a pixel point as an example, the red, green and blue areas of the whole pixel point are adjusted synchronously:

[0079] When no voltage is applied to the liquid crystal layer, the white light emitted by the backlight 100 is completely transmitted by the first liquid crystal layer 200 and the second liquid crystal layer 300, and passes through the filter 324, and the red, green and blue are mixed in the same proportion, so that a white pixel point is finally displayed;

[0080] When a voltage is applied to the liquid crystal layer (i.e., the same voltage is applied to the first and second liquid crystal layers), the liquid crystal molecules in the liquid crystal layer reflect some of the light, causing the light reaching the filter 324 to be greatly reduced. As a result, the theoretical color is generated when red, green and blue light are mixed and the red, green and blue light are generated in a weaker ratio. By controlling the magnitude of the control voltage, the arrangement of liquid crystal molecules can be controlled, and thus the color of the pixel can be controlled.

[0081] It is important to note that for an LCD screen to display black, the liquid crystal molecules in the liquid crystal layer need to be fully expanded and parallel to the polarizer to completely block the emitted backlight. However, the liquid crystal molecules cannot be completely closed. Even when they are closed to the maximum extent, there will still be some light. Therefore, when displaying an image, the contrast between the two areas is low. For example, when displaying black, it cannot be truly black, and a slight amount of light will still be emitted, resulting in a low contrast with the surrounding white light.

[0082] The present invention adjusts the light through at least two liquid crystal layers, so that the light emitted by the backlight 100 is first blocked by the first liquid crystal layer 200, thereby improving the accuracy of the brightness of the light after the first blocking. The light after the first blocking continues to be blocked by the second liquid crystal layer 300, thereby further improving the accuracy of the brightness of the light after the second blocking, thereby achieving a higher contrast display image and improving the contrast of adjacent areas of the image.

[0083] In this embodiment, the first liquid crystal layer 200 is a backlight control liquid crystal layer, and the second liquid crystal layer 300 is an image display liquid crystal layer. The backlight control liquid crystal layer 200 and the image display liquid crystal layer 300 are adjusted synchronously. It should be noted that the backlight control liquid crystal layer and the image display liquid crystal layer are composed of a pixel-to-pixel stacked architecture.

[0084] Specifically, the first liquid crystal layer 200 and the second liquid crystal layer 300 need to be synchronized so that the rotation direction of the liquid crystal molecules in the two liquid crystal layers is consistent, thereby ensuring the accuracy of the pixel brightness obtained after the light passes through the liquid crystal layer, and thus improving the contrast ratio.

[0085] In this embodiment, a first driving structure and a second driving structure are also included;

[0086] The first driving structure includes:

[0087] The first positive electrode circuit board 313 is located on one side of the first liquid crystal layer 200 (i.e., Figure 3 (Lower side) connection;

[0088] The first negative electrode circuit board 314 is located on the other side of the first liquid crystal layer 200 (i.e., Figure 3 (Top) connection;

[0089] The second driving structure includes:

[0090] The second positive electrode circuit board 322 is located on one side of the second liquid crystal layer 300 (i.e., Figure 3 (Lower side) connection;

[0091] The second negative electrode circuit board 323 is located on the other side of the second liquid crystal layer 300 (i.e., Figure 3 (Top) connection;

[0092] The first positive electrode circuit board 313, the first negative electrode circuit board 314, the second positive electrode circuit board 322 and the second negative electrode circuit board 323 are distributed sequentially. The first negative electrode circuit board 314 is located on the side closer to the second polarizer 320, and the second negative electrode circuit board 323 is located on the side closer to the third polarizer 326.

[0093] In this embodiment, it also includes:

[0094] The first glass substrate 312 is stacked and connected to the first positive electrode circuit board 313;

[0095] The second glass substrate 315 is stacked and connected to the first negative electrode circuit board 314;

[0096] The third glass substrate 321 is stacked and connected to the second positive electrode circuit board layer 322;

[0097] The fourth glass substrate 325 is laminated and connected to the side of the filter 324 that is close to the third polarizer 326.

[0098] Specifically, such as Figure 3 As shown, from bottom to top, the following components are arranged sequentially: a first polarizer 311, a first glass substrate 312, a first positive electrode circuit board 313, a first liquid crystal layer 200, a first negative electrode circuit board 314, a second glass substrate 315, a second polarizer 320, a third glass substrate 321, a second positive electrode circuit board 322, a second liquid crystal layer 300, a second negative electrode circuit board 323, a filter 324, a fourth glass substrate 325, and a third polarizer 326. Figure 3 The sizes of the elements are all the same, ensuring the accuracy of the brightness at the edges and improving contrast.

[0099] It should be noted that the image display liquid crystal layer has the same architecture as a regular LCD, while the backlight control liquid crystal layer has been simplified accordingly. It does not require a color filter, and the double-layer liquid crystal stacking reduces the number of polarizers between the two liquid crystal layers, requiring only one.

[0100] The driving of the backlight control liquid crystal layer can be processed by the SOC (System on Chip) of the LCD projection mainboard, and the brightness of each pixel point of each frame of image is obtained, such as the brightness value of a pixel point is 0, then the liquid crystal molecules of the liquid crystal layer are not deflected, and the polarized light cannot pass through the pixel point, so the corresponding image display is black, so that the black color becomes darker, thereby improving the contrast of the image.

[0101] The SOC of the projection mainboard processes the image information, and outputs two groups of LVDS signals (low-voltage differential signals) to control the backlight control layer and the image signal layer respectively. The LVDS signal of the image signal layer is the same as the conventional projection signal, and will not be described here. The LVDS signal output of the backlight control layer is 0 to 255, which is calculated according to the brightness of the image. That is, the low-voltage differential signal of the image to be displayed obtained by the SOC processing and transmitted to the image signal layer (the second liquid crystal layer 300) includes the RGB pixel signal and the first group of brightness signal, and the low-voltage differential signal of the image to be displayed obtained by the SOC processing and transmitted to the backlight control layer (the first liquid crystal layer 200) is the second group of brightness signal.

[0102] It should be noted that the two groups of low-voltage differential signals are calculated by using 8-bit data bits, so the value range is 0 to 255; but the first group of brightness signal is the brightness information of the image, and the second group of brightness signal is the brightness value of the R, G and B color signals.

[0103] In the embodiment, the display device further comprises:

[0104] The control chip (SOC, System on Chip) is connected with the first liquid crystal layer and the second liquid crystal layer, and is used for collecting image information (including the light and dark information corresponding to the pixel points) and calculating the first group of signals and the second group of signals according to the image information, that is, controlling the first liquid crystal layer according to the first group of signals and controlling the second liquid crystal layer according to the second group of signals.

[0105] It should be noted that the working principle of the LCD is that the LCD projection display device is a display assembly based on liquid crystal, which controls the rotation direction of the liquid crystal molecules by controlling the voltage at both ends of the liquid crystal molecules, and then controls the projection degree of polarized light of each pixel point to achieve the purpose of display. The LCM (LCD Module) commonly used at present is a component assembled by the display device (LCD), the control and driving chip, the PCB board, the backlight source, the structural part and the connector and many other parts.

[0106] Based on the above embodiment, the application further provides a display method of the LCD projection display device, applied to the LCD projection display device, having all the beneficial effects of the LCD projection display device, and comprising the following steps:

[0107] Step S100, acquiring an image to be displayed.

[0108] Specifically, the image to be displayed is acquired, for example, the first region is bright and the second region is black.

[0109] Step S200, determining the bright-dark information corresponding to each pixel point in the image to be displayed.

[0110] Specifically, the bright-dark information corresponding to the pixel point includes the red-green-blue level for determining the brightness of the pixel point in the image to be displayed and the coordinates for determining the position of the pixel point in the image to be displayed. The image information is collected by the control chip, wherein the image information includes the bright-dark information corresponding to each pixel point.

[0111] It should be noted that the liquid crystal layer in the application is controlled by the same polarity, and does not require positive and negative polarity.

[0112] Further, the red-green-blue level of each pixel point is the value of RGB, ranging from 0 to 255, and the value of RGB of each pixel point is the same, and the value of RGB of each pixel point is adjusted synchronously. For example, according to the image to be displayed, the red-green-blue level of a pixel point is determined as (125, 125, 125), the red-green-blue level of a pixel point is determined as (0, 0, 0), and the red-green-blue level of a pixel point is determined as (255, 255, 255).

[0113] Step S300, determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the bright-dark information corresponding to each pixel point.

[0114] Specifically, the control chip calculates the first group of signals and the second group of signals according to the image information, that is, controls the first liquid crystal layer according to the first group of signals and controls the second liquid crystal layer according to the second group of signals. The first group of signals and the second group of signals are both low-voltage differential signals; the first group of signals includes pixel signals and a first group of brightness signals, and the second group of signals includes a second group of brightness signals. It should be noted that the brightness signal is also the value of the RGB level, such as (0, 0, 0) and (255, 255, 255).

[0115] The step S300 specifically comprises:

[0116] Step S310, determining the low-voltage differential signal corresponding to each pixel point according to the red-green-blue level corresponding to each pixel point;

[0117] Step S320, determining the pixel signal corresponding to the to-be-displayed image, the first group of luminance signals and the second group of luminance signals according to the low-voltage differential signals corresponding to the respective pixel points; the value ranges of the first group of luminance signals and the second group of luminance signals are both 0 to 255.

[0118] Specifically, the first group of luminance signals is the same as the second group of luminance signals, when the red-green-blue level of a pixel point is (125, 125, 125), the low-voltage differential signal output of the pixel point is (125, 125, 125); when the red-green-blue level of a pixel point is (0, 0, 0), the low-voltage differential signal output of the pixel point is (0, 0, 0); when the red-green-blue level of a pixel point is (255, 255, 255), the low-voltage differential signal output of the pixel point is (255, 255, 255), thereby the low-voltage differential signals of the above-mentioned multiple pixel points are collected to obtain the first group of luminance signals and the second group of luminance signals.

[0119] In an implementation manner, the step S310 specifically comprises:

[0120] Step S311, determining the low-voltage differential signal corresponding to each respective pixel point according to the coordinates and the red-green-blue level corresponding to each respective pixel point.

[0121] Step S400, controlling the first liquid crystal layer to transmit or shield light according to the first group of signals, and synchronously controlling the second liquid crystal layer to transmit or shield light according to the second group of signals, to generate the image corresponding to the to-be-displayed image.

[0122] Specifically, the to-be-displayed image comprises a first region and a second region adjacent to each other.

[0123] It should be noted that when the luminance signal is 0, the liquid crystal layer cannot transmit the light of the backlight source; when the luminance signal is 255, the liquid crystal layer completely transmits the light of the backlight source; when the luminance signal is other values (such as 125), by applying the corresponding voltage, the liquid crystal can be in the corresponding deflection state, so as to control the brightness of the backlight source, and further accurately control the brightness.

[0124] The step S400 specifically comprises:

[0125] Step S410, when the first group of luminance signals and the second group of luminance signals in the first region are 0, controlling the first driving structure to apply voltage to the first liquid crystal layer to make the first liquid crystal layer completely shield the light of the backlight source, and controlling the second driving structure to apply voltage to the second liquid crystal layer to make the second liquid crystal layer completely shield the light of the backlight source, to generate the image corresponding to the first region;

[0126] Step S420, when the first group of brightness signals and the second group of brightness signals in the second region are 255, the first driving structure is controlled to apply a voltage to the first liquid crystal layer to make the first liquid crystal layer completely transmit the light of the backlight, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer to make the second liquid crystal layer completely transmit the light of the backlight, to generate the image corresponding to the second region; or

[0127] When the first group of brightness signals and the second group of brightness signals in the second region are 125, the first driving structure is controlled to apply a voltage to the first liquid crystal layer to make the first liquid crystal layer partially shield the light of the backlight, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer to make the second liquid crystal layer partially shield the light of the backlight, to generate the image corresponding to the second region.

[0128] Step S430, according to the image corresponding to the first region and the image corresponding to the second region, the image corresponding to the image to be displayed is obtained, so that the image corresponding to the first region and the image corresponding to the second region do not affect each other.

[0129] It should be noted that the two groups of different brightness signals can be any value of 0-255, so that the image corresponding to the image to be displayed is determined by the two images corresponding to the two regions, to ensure the coordination of the two regions of the image and improve the contrast of the two regions of the image.

[0130] In summary, the present application provides an LCD projection display device and a display method, the present application adjusts the light through two liquid crystal layers, so that the light emitted by the backlight is first shielded by the first liquid crystal layer, to improve the accuracy of the light and dark degree after the first shielding, and the light after the first shielding is further shielded by the second liquid crystal layer, to further improve the accuracy of the light and dark degree after the second shielding, to realize the pixel point level backlight switch, so that the pixel point of black display can reach the full black state, and the pixel point of bright display can normally transmit the backlight, to realize a display image with higher contrast, and to improve the contrast of the image of adjacent regions.

[0131] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An LCD projection display apparatus, characterized by comprising: The display device comprises: a shell; a backlight source arranged in the shell and used for emitting light; a first polarizer arranged in the shell; a first liquid crystal layer connected to the shell and used for controlling transmission or shielding of light according to brightness information of an image; a second polarizer arranged in the shell; a second liquid crystal layer connected to the shell and used for controlling transmission or shielding of light according to a color signal brightness value, the first liquid crystal layer and the second liquid crystal layer being controlled by the same polarity; a filter arranged in the shell; a third polarizer arranged in the shell; wherein the backlight source and the first polarizer are arranged oppositely, the first polarizer, the second polarizer, the filter and the third polarizer are sequentially distributed, the first liquid crystal layer is located between the first polarizer and the second polarizer, the second liquid crystal layer is located between the second polarizer and the filter, and the first polarizer, the second polarizer and the third polarizer have the same parameters and structure. The display device further comprises: a first driving structure and a second driving structure; the first driving structure comprises: a first positive electrode circuit board connected to one side of the first liquid crystal layer; a first negative electrode circuit board connected to the other side of the first liquid crystal layer; the second driving structure comprises: a second positive electrode circuit board connected to one side of the second liquid crystal layer; a second negative electrode circuit board connected to the other side of the second liquid crystal layer; wherein the first positive electrode circuit board, the first negative electrode circuit board, the second positive electrode circuit board and the second negative electrode circuit board are sequentially distributed, the first negative electrode circuit board is located on the side close to the second polarizer, and the second negative electrode circuit board is located on the side close to the third polarizer. The display device further comprises: a control chip connected to the first liquid crystal layer and the second liquid crystal layer, used for collecting image information and calculating a first group of signals and a second group of signals according to the image information; the first liquid crystal layer is a backlight control liquid crystal layer, and the second liquid crystal layer is an image display liquid crystal layer; the backlight control liquid crystal layer and the image display liquid crystal layer are synchronously adjusted; the control chip is further used for controlling the backlight control liquid crystal layer according to the first group of signals and controlling the image display liquid crystal layer according to the second group of signals; the first group of signals and the second group of signals are both low-voltage differential signals, and the low-voltage differential signals have a value range of 0-255; the first group of signals comprises a pixel signal and a first group of brightness signals, and the second group of signals comprises a second group of brightness signals; the first group of brightness signals and the second group of brightness signals are the same, and the red, green and blue levels corresponding to each pixel point of each image to be displayed are the low-voltage differential signals corresponding to the pixel point.

2. The LCD projection display apparatus according to claim 1, wherein The display device further comprises: a first glass substrate laminatedly connected to the first positive electrode circuit board; a second glass substrate laminatedly connected to the first negative electrode circuit board; a third glass substrate laminatedly connected to the second positive electrode circuit board; a fourth glass substrate laminatedly connected to one side of the filter close to the third polarizer.

3. A display method of the LCD projection display apparatus according to claim 1 or 2, characterized by, The method comprises: acquiring an image to be displayed; determining brightness and darkness information corresponding to each pixel point of the image to be displayed respectively; According to the bright-dark information corresponding to each pixel point, a first group of signals and a second group of signals corresponding to the image to be displayed are determined, wherein the first group of signals and the second group of signals are low-voltage differential signals; According to the first group of signals, the first liquid crystal layer is controlled to transmit or shield light, and according to the second group of signals, the second liquid crystal layer is synchronously controlled to transmit or shield light, thereby generating an image corresponding to the image to be displayed.

4. The display method of the LCD projection display apparatus according to claim 3, wherein The bright-dark information corresponding to the pixel point includes red-green-blue levels used to determine the brightness of the pixel point in the image to be displayed; the first group of signals includes a pixel signal and a first group of brightness signals, and the second group of signals includes a second group of brightness signals; The method for determining the first group of signals and the second group of signals corresponding to the image to be displayed according to the bright-dark information corresponding to each pixel point includes: According to the red-green-blue levels corresponding to each pixel point, low-voltage differential signals corresponding to each pixel point are determined; According to the low-voltage differential signals corresponding to each pixel point, a pixel signal, a first group of brightness signals and a second group of brightness signals corresponding to the image to be displayed are determined.

5. The display method of the LCD projection display apparatus according to claim 4, wherein The bright-dark information corresponding to the pixel point further includes coordinates used to determine the position of the pixel point in the image to be displayed; The method for determining the low-voltage differential signals corresponding to each pixel point according to the red-green-blue levels corresponding to each pixel point includes: According to the coordinates and the red-green-blue levels corresponding to each pixel point, the low-voltage differential signals corresponding to each pixel point are determined.

6. The display method of the LCD projection display apparatus according to claim 4, wherein The image to be displayed includes a first region and a second region adjacent to each other; the value range of the first group of brightness signals and the second group of brightness signals is 0 to 255; The method for generating an image corresponding to the image to be displayed by controlling the first liquid crystal layer to transmit or shield light according to the first group of signals and synchronously controlling the second liquid crystal layer to transmit or shield light according to the second group of signals includes: When the first group of brightness signals and the second group of brightness signals in the first region are 0, a first driving structure is controlled to apply a voltage to the first liquid crystal layer so that the first liquid crystal layer completely shields the light of a backlight source, and a second driving structure is controlled to apply a voltage to the second liquid crystal layer so that the second liquid crystal layer completely shields the light of the backlight source, thereby generating an image corresponding to the first region; When the first group of brightness signals and the second group of brightness signals in the second region are 255, the first driving structure is controlled to apply a voltage to the first liquid crystal layer so that the first liquid crystal layer completely transmits the light of the backlight source, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer so that the second liquid crystal layer completely transmits the light of the backlight source, thereby generating an image corresponding to the second region; According to the image corresponding to the first region and the image corresponding to the second region, an image corresponding to the image to be displayed is obtained, so that the image corresponding to the first region and the image corresponding to the second region do not affect each other.

7. The display method of the LCD projection display apparatus according to claim 6, wherein The first liquid crystal layer is controlled to transmit or shield light according to the first group of signals, and the second liquid crystal layer is synchronously controlled to transmit or shield light according to the second group of signals, to generate an image corresponding to the image to be displayed, and the method further comprises: When the first group of luminance signals and the second group of luminance signals in the first area are 0, the first driving structure is controlled to apply a voltage to the first liquid crystal layer, so that the first liquid crystal layer completely shields the light of the backlight source, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer, so that the second liquid crystal layer completely shields the light of the backlight source, to generate an image corresponding to the first area; When the first group of luminance signals and the second group of luminance signals in the second area are 125, the first driving structure is controlled to apply a voltage to the first liquid crystal layer, so that the first liquid crystal layer partially shields the light of the backlight source, and the second driving structure is controlled to apply a voltage to the second liquid crystal layer, so that the second liquid crystal layer partially shields the light of the backlight source, to generate an image corresponding to the second area.

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