Display device

Abstract

To provide a display device which can improve the readability of characters.SOLUTION: The present invention includes a display panel P having a display region in which a plurality of pixels are arranged in a first direction and in a second direction intersecting the first direction, the display panel P enabling a mirror image of an image when the display region is seen in plan view from one direction, to be visually recognized from another direction. At least a part of the display region includes: a plurality of first regions A1, which are viewable from one direction and are light-shielded in another surface, and a plurality of second regions A2, which are viewable from another direction and are light-shielded in one surface.SELECTED DRAWING: Figure 7C

Description

Technical Field

[0001] The present invention relates to a display device.

Background Art

[0002] Patent Document 1 discloses a display device configured to be able to visually recognize the background on the other side from one side of a display panel. The display device of Patent Document 1 is a so-called transparent display, and includes a display panel having a liquid crystal layer containing polymer-dispersed liquid crystal, and a light source disposed opposite to the side surface of the display panel. Further, in Patent Document 2, a transparent display is configured by a self-emitting organic EL display device in which an interlayer insulating film and a planarization film in a display region are removed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a transparent display, the image viewed from one side and the image viewed from the other side are mirror images. For this reason, when trying to ensure the readability of the character information included in the images on both the image viewed from one side and the image viewed from the other side, a display area twice as large is required. Alternatively, for example, when the font size is reduced to reduce the display area of the character information, the readability of the characters may decrease.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a display device capable of enhancing the readability of characters.

Means for Solving the Problems

[0006] A display device according to an aspect of the present disclosure has a display area in which a plurality of pixels are arranged in a first direction and a second direction intersecting the first direction, and includes a display panel capable of visually recognizing a mirror image of an image viewed from one direction in a plan view from the other direction. At least a part of the display area includes a plurality of first areas that are viewed from one direction and the other surface is shielded from light, and a plurality of second areas that are viewed from the other direction and one surface is shielded from light.

Brief Description of the Drawings

[0007]

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Best Mode for Carrying Out the Invention

[0008] Embodiments for carrying out the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited by the content described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and substantially identical ones. Furthermore, the components described below can be combined as appropriate. Also, the disclosure is merely an example, and for those that can be easily conceived by those skilled in the art with appropriate modifications while maintaining the gist of the disclosure, they are naturally included in the scope of the present disclosure. Also, for the purpose of making the description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but this is merely an example and does not limit the interpretation of the present disclosure. Also, in this specification and each drawing, elements that are the same as those described above with respect to the previously shown drawings may be denoted by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] FIG. 1 is a block diagram showing a schematic configuration of a display device according to an embodiment. In the present disclosure, the display device 100 is a transmissive liquid crystal display device that performs display output in a so-called field sequential color (FSC) method in which pixels are controlled to transmit light of a plurality of colors from the same pixel at different timings.

[0010] As shown in FIG. 1, the display device 100 according to the embodiment includes a display panel module DPM and an image processing circuit 70. The display panel module DPM includes a display panel P and a light source device L.

[0011] The display panel P includes a display area 7, a signal output circuit 8, a scanning circuit 9, a VCOM driving circuit 10, a timing controller 13, and a power supply circuit 14. Hereinafter, one surface of the display panel P when the display area 7 is viewed from one direction in plan view is defined as the first surface, and the other surface on which the mirror image of the display image on the first surface can be visually recognized is defined as the second surface. Also, when described as being on the side of the display device 100, it is located in a direction intersecting (for example, orthogonal) in the direction of opposition between the first surface and the second surface with respect to the display device 100.

[0012] In the display area 7, a plurality of pixels Pix are arranged in a matrix in the X direction (first direction) and the Y direction (second direction). The Y direction (second direction) is a direction intersecting the X direction (first direction). More specifically, in the example shown in FIG. 1, the Y direction (second direction) is a direction orthogonal to the X direction (first direction).

[0013] The pixel Pix includes a switching element 1 and two electrodes. FIG. 2 is a schematic cross-sectional view of the display panel. In FIGS. 1 and 2, as the two electrodes, a pixel electrode 2 and a common electrode 6 are illustrated.

[0014] The display panel P has two opposing substrates and liquid crystal 3 encapsulated between the two substrates. Hereinafter, one of the two substrates is defined as the first substrate 30, and the other is defined as the second substrate 20. In the present disclosure, the surface on the first substrate 30 side of the display panel P is defined as the first surface 7a, and the surface on the second substrate 20 side of the display panel P is defined as the second surface 7b.

[0015] The first substrate 30 includes a light-transmissive glass substrate 35, a pixel electrode 2 laminated on the second substrate 20 side of the glass substrate 35, and an insulating layer 55 laminated on the second substrate 20 side so as to cover the pixel electrode 2. The pixel electrode 2 is provided individually for each pixel Pix. The second substrate 20 includes a light-transmissive glass substrate 21, a common electrode 6 laminated on the first substrate 30 side of the glass substrate 21, and an insulating layer 56 laminated on the first substrate 30 side so as to cover the common electrode 6. The common electrode 6 has a plate-like or film-like shape shared by a plurality of pixels Pix.

[0016] The liquid crystal 3 of Embodiment 1 is a polymer dispersed liquid crystal (PDLC). In other words, in this embodiment, the display panel P is a liquid crystal panel in which the polymer dispersed liquid crystal is encapsulated. Specifically, the liquid crystal 3 includes a bulk 51 and fine particles 52. The orientation of the fine particles 52 changes according to the potential difference between the pixel electrode 2 and the common electrode 6 within the bulk 51. By individually controlling the potential of the pixel electrode 2 for each pixel Pix, the scattering state of the liquid crystal 3 for each pixel Pix is controlled.

[0017] FIG. 2 shows an example in which the pixel electrode 2 and the common electrode 6 are arranged to face each other with the liquid crystal 3 interposed therebetween. However, the display panel P may be configured such that the pixel electrode 2 and the common electrode 6 are provided on one substrate and the orientation changes due to the electric field generated by the pixel electrode 2 and the common electrode 6, and the scattering state of the liquid crystal 3 is controlled.

[0018] Next, the mechanism for controlling the potentials of the pixel electrode 2 and the common electrode 6 will be described.

[0019] The switching element 1 is a switching element using a semiconductor, such as a thin film transistor (TFT). One of the source or drain of the switching element 1 is connected to one of the two electrodes (pixel electrode 2). The other of the source or drain of the switching element 1 is connected to the signal line SDL(m) (m is an integer from 1 to M, and M is the total number of signal lines). The gate of the switching element 1 is connected to the scanning line SCL(n) (n is an integer from 1 to N, and N is the total number of scanning lines). The scanning line SCL(n) applies a potential for opening and closing the source-drain path of the switching element 1 under the control of the scanning circuit 9. The control of the potential is performed by the scanning circuit 9.

[0020] In the example shown in FIG. 1, a plurality of signal lines SDL(n) are arranged along one of the pixel Pix arrangement directions (row direction). The signal line SDL(m) extends along the other of the pixel Pix arrangement directions (column direction). The signal line SDL(m) is shared by the switching elements 1 of a plurality of pixels Pix arranged in the column direction. A plurality of scanning lines SCL(n) are arranged along the column direction. The scanning line SCL(n) extends along the row direction. The scanning line SCL(n) is shared by the switching elements 1 of a plurality of pixels Pix arranged in the row direction.

[0021] In the present disclosure, the extending direction of the scanning line SCL(n) is defined as the X direction (first direction), and the direction in which the plurality of scanning lines SCL(n) are arranged is defined as the Y direction (second direction).

[0022] The common electrode 6 is connected to the VCOM driving circuit 10. The VCOM driving circuit 10 applies a common potential to the common electrode 6.

[0023] The scanning circuit 9 sequentially supplies a driving signal that functions as an on potential (driving potential) of the switching element 1 to the scanning line SCL(n) to which a plurality of pixels Pix arranged in the X direction (first direction) are connected. In other words, the scanning circuit 9 supplies a driving signal to a plurality of pixels Pix arranged in the X direction (first direction) simultaneously. Further, the scanning circuit 9 sequentially supplies a driving signal to a plurality of pixels Pix arranged in the Y direction (second direction).

[0024] The signal output circuit 8 sequentially supplies a pixel signal that functions as pixel data (hereinafter also referred to as "pixel data") of a pixel corresponding to each pixel Pix to the signal line SDL(m) to which a plurality of pixels Pix arranged in the Y direction (second direction) are connected. In other words, the signal output circuit 8 sequentially supplies pixel data to a plurality of pixels Pix arranged in the Y direction (second direction). Further, the signal output circuit 8 supplies pixel data to a plurality of pixels Pix arranged in the X direction (first direction) simultaneously.

[0025] When the scanning circuit 9 supplies a driving signal to the scanning line SCL(n) and the switching elements 1 of a plurality of pixels Pix arranged in the X direction (first direction) are turned on, the signal output circuit 8 supplies a pixel signal to the signal line SDL(m), thereby charging the storage capacitor formed between the pixel electrode 2 and the common electrode 6 of a plurality of pixels Pix arranged in the X direction (first direction) and the liquid crystal 3 (fine particles 52) which is a capacitive load. As a result, a voltage corresponding to the pixel data corresponding to each pixel Pix is applied between the pixel electrode 2 and the common electrode 6 of a plurality of pixels Pix arranged in the X direction (first direction). When the scanning circuit 9 sequentially supplies a driving signal to the scanning lines SCL(n) arranged in the Y direction (second direction), and the signal output circuit 8 supplies pixel data corresponding to a plurality of pixels Pix connected to the scanning line SCL(n) to which the driving signal is supplied by the scanning circuit 9, the pixel data of an image for one sub-frame (a plurality of monochromatic images constituting an image for one frame) is written.

[0026] After the switching element 1 is turned off, the applied voltage between the pixel electrode 2 and the common electrode 6 is held by the storage capacitor and the liquid crystal 3 (fine particles 52) which is a capacitive load. The degree of scattering of the liquid crystal 3 (fine particles 52) is controlled according to the applied voltage between the pixel electrode 2 and the common electrode 6 for each pixel Pix. The liquid crystal 3 may be, for example, a polymer dispersed liquid crystal in which the degree of scattering increases as the applied voltage between the pixel electrode 2 and the common electrode 6 for each pixel Pix increases, or a polymer dispersed liquid crystal in which the degree of scattering increases as the applied voltage between the pixel electrode 2 and the common electrode 6 for each pixel Pix decreases.

[0027] As shown in FIG. 2, a light source device L is arranged on the side of the display panel P (in FIG. 1, below the display panel P). The light source device L includes a light source 11 that irradiates light on the side surface of the display panel P and a light source drive circuit 12 that controls the light source 11. The light source 11 includes a first light source 11R, a second light source 11G, and a third light source 11B.

[0028] The first light source 11R, the second light source 11G, and the third light source 11B emit light under the control of the light source driving circuit 12, respectively. The first light source 11R, the second light source 11G, and the third light source 11B are light sources using light emitting elements such as light emitting diodes (LEDs), for example, but are not limited thereto, and any light source capable of controlling the light emitting timing may be used.

[0029] The light source driving circuit 12 controls the light emitting timings of the first light source 11R, the second light source 11G, and the third light source 11B under the control of the timing controller 13. In the present disclosure, the light emitting color (first color) of the first light source 11R is red (R), the light emitting color (second color) of the second light source 11G is green (G), and the light emitting color (third color) of the third light source 11B is blue (B).

[0030] When light is irradiated from the light source 11, the display area 7 is illuminated by the light (first color, second color, third color) irradiated from one side surface in the Y direction. Each pixel Pix transmits or scatters the light irradiated from one side surface in the Y direction. The degree of scattering of the liquid crystal 3 for each pixel Pix depends on the state of the liquid crystal 3 controlled according to the pixel signal for each pixel Pix.

[0031] The timing controller 13 is a circuit that controls the operation timings of the signal output circuit 8, the scanning circuit 9, the VCOM driving circuit 10, and the light source driving circuit 12. In the present disclosure, the timing controller 13 operates based on the signal input via the image processing circuit 70.

[0032] The image processing circuit 70 outputs a signal based on the display image data to the signal output circuit 8 and the timing controller 13. If data indicating the RGB gradation values assigned to one pixel Pix among the plurality of pixels Pix provided in the display area 7 is defined as pixel data, the display image data input to the image processing circuit 70 to output the display image is a set of a plurality of pixel data for each pixel Pix in the display area 7. Note that the image processing circuit 70 may be provided on one of the substrates constituting the display panel P, may be mounted on a flexible printed circuit board provided with wirings or the like extending from the display panel P, or may be configured to be provided outside the display panel P.

[0033] FIG. 3 is a timing chart showing the sub-frame period and the light emission period in one frame period for displaying display image data. In FIG. 3, the image display period FP of one frame is set to 20 ms. At this time, the image display frame rate in the display device 100 is set to 50 FPS.

[0034] In the display device 100 that performs display output in the FSC method, the image display period FP of one frame based on the display image data is time-divided into a first sub-frame period RF, a second sub-frame period GF, and a third sub-frame period BF as shown in FIG. 3. The first sub-frame period RF, the second sub-frame period GF, and the third sub-frame period BF are each set to 6.67 ms.

[0035] During the vertical scanning period GateScan (first period) of the first sub-frame period RF, writing of pixel data corresponding to the output gradation value of each pixel Pix corresponding to the first color (red (R)) of the display image data is performed. As a result, a voltage corresponding to each pixel data for each pixel Pix is applied to the pixel electrode 2, and the scattering state of the liquid crystal 3 for each pixel Pix is controlled according to the applied voltage of the pixel electrode 2. The vertical scanning period GateScan (first period) of the first sub-frame period RF is set to, for example, 2.5 ms.

[0036] In the subsequent light emission period RON (the second period), the first light source 11R is caused to emit light. In this light emission period RON (the second period), light of the first color (red (R)) corresponding to each pixel data for each pixel Pix written in the immediately preceding vertical scanning period GateScan is scattered and displayed.

[0037] In the vertical scanning period GateScan (the first period) of the second sub-frame period GF, pixel data is written according to the output gradation value of each pixel Pix corresponding to the second color (green (G)) of the display image data. As a result, a voltage corresponding to each pixel data for each pixel Pix is applied to the pixel electrode 2, and according to the applied voltage of the pixel electrode 2, the scattering state of the liquid crystal 3 for each pixel Pix is controlled. The vertical scanning period GateScan (the first period) of the second sub-frame period GF is, for example, 2.5 ms.

[0038] In the subsequent light emission period GON (the second period), the second light source 11G is caused to emit light. In this light emission period GON (the second period), light of the second color (green (G)) corresponding to each pixel data for each pixel Pix written in the immediately preceding vertical scanning period GateScan is scattered and displayed.

[0039] In the vertical scanning period GateScan (the first period) of the third sub-frame period BF, pixel data is written according to the output gradation value of each pixel Pix corresponding to the third color (blue (B)) of the display image data. As a result, a voltage corresponding to each pixel data for each pixel Pix is applied to the pixel electrode 2, and according to the applied voltage of the pixel electrode 2, the scattering state of the liquid crystal 3 for each pixel Pix is controlled. The vertical scanning period GateScan (the first period) of the third sub-frame period BF is, for example, 2.5 ms.

[0040] In the subsequent light emission period BON (the second period), the third light source 11B is caused to emit light. In this light emission period BON (the second period), light of the third color (blue (B)) corresponding to each pixel data for each pixel Pix written in the immediately preceding vertical scanning period GateScan is scattered and displayed.

[0041] In the above-described FSC display device 100, due to the afterimage phenomenon caused by the limitation of the temporal resolution of the human eye, an image in which three colors, i.e., the first color (red (R)), the second color (green (G)), and the third color (blue (B)), are synthesized (color-mixed) is recognized. Further, in the FSC display device 100, since it is not necessary to provide a color filter for each pixel Pix, the light transmittance in the display area 7 can be increased.

[0042] FIG. 4A and FIG. 4B are conceptual diagrams showing an example of a display mode according to a comparative example.

[0043] As described above, the display panel P is configured such that a mirror image of the image of the display area 7 viewed in plan from one direction can be visually recognized from the other direction. In other words, the display image on the first surface 7a of the display panel P when the display area 7 is viewed in plan from one direction and the display image on the second surface 7b of the display panel P when the display area 7 is viewed in plan from the other direction are mirror images of each other.

[0044] FIG. 4A shows a display example on the first surface 7a of the display panel P when the display area 7 is viewed in plan from one direction. FIG. 4B shows a display example on the second surface 7b of the display panel P when the display area 7 is viewed in plan from the other direction. Here, an example is illustrated in which the first character information 200a that can be read when the first surface 7a of the display panel P is viewed in plan from one direction and the second character information 300b that can be read when the second surface 7b of the display panel P is viewed in plan from the other direction are displayed.

[0045] When the first character information 200a is viewed in a plan view from the other direction on the second surface 7b of the display panel P, it is visually recognized as the mirror-inverted first character information 200b. The second character information 300b is visually recognized as the mirror-inverted second character information 300a when the second surface 7b of the display panel P is viewed in a plan view from the other direction. Thus, in the display mode shown in the comparative example, when trying to ensure the readability of the character information both when viewing the first surface 7a of the display panel P from one direction and when viewing the second surface 7b of the display panel P from the other direction, a display area twice as large is required. Alternatively, for example, if the font size is reduced to reduce the display area of the character information, the readability of the characters may decrease.

[0046] FIG. 5A and FIG. 5B are conceptual diagrams showing an example of a character information display area according to an embodiment. FIG. 6A and FIG. 6B are conceptual diagrams showing an example of a display mode in the character information display area according to an embodiment.

[0047] In FIG. 5A, a character information display area AAa on the first surface 7a of the display panel P when the display area 7 is viewed in a plan view from one direction is shown. In FIG. 5B, a character information display area AAb on the second surface 7b of the display panel P when the display area 7 is viewed in a plan view from the other direction is shown.

[0048] In FIG. 6A, a display example of the first character information 200a in the character information display area AAa is shown. In FIG. 5B, a display example of the second character information 300b in the character information display area AAb is shown.

[0049] In the present embodiment, as shown in FIGS. 6A and 6B, the first character information 200a that can be read when the first surface 7a of the display panel P is viewed in a plan view from one direction is displayed in the character information display area AAa shown in FIG. 5A, and the second character information 300b that can be read when the second surface 7b of the display panel P is viewed in a plan view from the other direction is displayed in the character information display area AAb shown in FIG. 5B.

[0050] In the present embodiment, the character information display area AAa and the character information display area AAb are provided integrally on the front and back surfaces of the display panel P, i.e., the first surface 7a and the second surface 7b of the display panel P. When the first surface 7a of the display panel P is viewed in a plan view from one direction, the mirror image of the first character information 200a (corresponding to 200b shown in FIG. 4B) displayed in the character information display area AAa is not visible when the second surface 7b of the display panel P is viewed in a plan view from the other direction. Further, when the second surface 7b of the display panel P is viewed in a plan view from the other direction, the mirror image of the second character information 300b (corresponding to 300a shown in FIG. 4A) displayed in the character information display area AAb is not visible when the first surface 7a of the display panel P is viewed in a plan view from one direction.

[0051] Hereinafter, a configuration capable of realizing the display mode according to the above-described embodiment will be described.

[0052] (Embodiment 1) FIGS. 7A and 7B are enlarged views of the character information display area according to Embodiment 1. FIG. 7C is a cross-sectional view taken along the line A-A shown in FIGS. 7A and 7B. FIG. 7D is a cross-sectional view taken along the line B-B shown in FIGS. 7A and 7B.

[0053] FIG. 7A shows a first light-shielding pattern when the character information display area AAa is viewed in a plan view from one direction. FIG. 7B shows a second light-shielding pattern when the character information display area AAb is viewed in a plan view from one direction through transparency.

[0054] The character information display area AA (AAa, AAb) includes a plurality of first regions A1 whose second surface 7b side is shielded by the first light-shielding pattern S1 and is visible from one direction, and a plurality of second regions A2 whose first surface 7a side is shielded by the second light-shielding pattern S2 and is visible from the other direction.

[0055] In the configuration according to Embodiment 1, the plurality of first regions A1 are provided corresponding to one pixel Pix1 each. Further, the plurality of second regions A2 are provided corresponding to one pixel Pix2 each.

[0056] In the configuration according to Embodiment 1, the first region A1 and the second region A2 are alternately arranged in the X direction (the first direction). Also, the first region A1 and the second region A2 are alternately arranged in the Y direction (the second direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a checkered light-shielding pattern in pixel units.

[0057] The first light-shielding pattern S1 may be formed, for example, by applying a black resin material to the surface of the second substrate 20, or may be formed on a transparent base material different from the second substrate 20 and bonded to the surface of the display panel P on the side of the second substrate 20. Alternatively, the first light-shielding pattern S1 may be provided in a manner where it is provided on the common electrode 6.

[0058] The second light-shielding pattern S2 may be formed, for example, by applying a black resin material to the surface of the first substrate 30, or may be formed on a transparent base material different from the first substrate 30 and bonded to the surface of the display panel P on the side of the first substrate 30. Alternatively, the second light-shielding pattern S2 may be provided in a manner where it is provided on the pixel electrode 2.

[0059] Also, the first light-shielding pattern S1 and the second light-shielding pattern S2 are not limited to resin paints. The first light-shielding pattern S1 and the second light-shielding pattern S2 may be formed, for example, of a light-shielding metal material.

[0060] In the above-described configuration, the image processing circuit 70 performs image processing such that the first character information 200a is visible when the first surface 7a of the display panel P is viewed in plan view from one direction, and the second character information 300b is visible when the second surface 7b of the display panel P is viewed in plan view from the other direction.

[0061] In other words, when the image displayed in the character information display area AAa is viewed from one direction in a plan view of the first surface 7a of the display panel P, the pixels Pix2 corresponding to the second character information 300a, which is the mirror image of the second character information 300b, are masked by the first light-shielding pattern when the first surface 7a of the display panel P is viewed from one direction in a plan view, and are visually recognized as the first character information 200a formed by the pixels Pix1 corresponding to the plurality of first regions A1.

[0062] Also, when the image displayed in the character information display area AAb is viewed from the other direction in a plan view of the second surface 7b of the display panel P, the pixels Pix1 corresponding to the first character information 200b, which is the mirror image of the first character information 200a, are masked by the second light-shielding pattern when the second surface 7b of the display panel P is viewed from the other direction in a plan view, and are visually recognized as the second character information 300b formed by the pixels Pix2 corresponding to the plurality of second regions A2.

[0063] Thereby, it is possible to ensure readability while optimizing the display area and font size of the character information in both the case of viewing the first surface 7a of the display panel P from one direction and the case of viewing the second surface 7b of the display panel P from the other direction. Also, since the mirror image characters are not visually recognized, the visibility of the entire image can be enhanced.

[0064] (First Modified Example) FIGS. 8A and 8B are enlarged views of the character information display area according to the first modified example of Embodiment 1. FIG. 8C is a cross-sectional view taken along the line B-B shown in FIGS. 8A and 8B. Note that descriptions similar to those of Embodiment 1 may be omitted.

[0065] In the configuration according to the first modified example of Embodiment 1, the plurality of first regions A1 are provided corresponding to one pixel column in which the pixels Pix1 are arranged in the Y direction (second direction), respectively. Also, the plurality of second regions A2 are provided corresponding to one pixel column in which the pixels Pix2 are arranged in the Y direction (second direction), respectively.

[0066] Further, in the configuration according to the first modification of Embodiment 1, the first region A1 and the second region A2 are alternately arranged in the X direction (first direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a vertical stripe-shaped light-shielding pattern in units of pixel columns.

[0067] Thus, as in Embodiment 1, in both the case of viewing the first surface 7a of the display panel P from one direction and the case of viewing the second surface 7b of the display panel P from the other direction, it is possible to ensure readability while optimizing the display area and font size of the character information. Also, since mirror image characters are not visible, the visibility of the entire image can be enhanced.

[0068] (Second Modification) FIGS. 9A and 9B are enlarged views of the character information display area according to the second modification of Embodiment 1. FIG. 9C is a cross-sectional view taken along the line A-A shown in FIGS. 9A and 9B. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0069] In the configuration according to the second modification of Embodiment 1, the plurality of first regions A1 are each provided corresponding to one pixel row in which pixels Pix1 are arranged in the X direction (first direction). Also, the plurality of second regions A2 are each provided corresponding to one pixel row in which pixels Pix2 are arranged in the X direction (first direction).

[0070] Further, in the configuration according to the second modification of Embodiment 1, the first region A1 and the second region A2 are alternately arranged in the Y direction (second direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a horizontal stripe-shaped light-shielding pattern in units of pixel rows.

[0071] Thus, as in Embodiment 1, in both the case of viewing the first surface 7a of the display panel P from one direction and the case of viewing the second surface 7b of the display panel P from the other direction, it is possible to ensure readability while optimizing the display area and font size of the character information. Also, since mirror image characters are not visible, the visibility of the entire image can be enhanced.

[0072] (Embodiment 2) FIG. 10A and FIG. 10B are enlarged views of the character information display area according to Embodiment 2. FIG. 10C is an arrow sectional view taken along line A-A shown in FIGS. 10A and 10B. FIG. 10D is an arrow sectional view taken along line B-B shown in FIGS. 10A and 10B. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0073] In the configuration according to Embodiment 2, the plurality of first regions A1 are provided corresponding to the plurality of pixels Pix1, respectively. Also, the plurality of second regions A2 are provided corresponding to the plurality of pixels Pix2, respectively.

[0074] In other words, the plurality of first regions A1 each include a plurality of pixels Pix1 in the X direction (first direction). Also, the plurality of second regions A2 each include a plurality of pixels Pix2 in the X direction (first direction). Here, an example is shown in which the plurality of first regions A1 each include two pixels Pix1 in the X direction (first direction), and the plurality of second regions A2 each include two pixels Pix2 in the X direction (first direction).

[0075] Also, the plurality of first regions A1 each include a plurality of pixels Pix1 in the Y direction (second direction). Also, the plurality of second regions A2 each include a plurality of pixels Pix2 in the Y direction (second direction). Here, an example is shown in which the plurality of first regions A1 each include two pixels Pix1 in the Y direction (second direction), and the plurality of second regions A2 each include two pixels Pix2 in the Y direction (second direction).

[0076] Also, in the configuration according to Embodiment 2, the first region A1 and the second region A2 are provided alternately in the X direction (first direction). Also, the first region A1 and the second region A2 are provided alternately in the Y direction (second direction). As a result, the first light shielding pattern S1 and the second light shielding pattern S2 each become a checkered light shielding pattern in units of a plurality (here, 2×2 = 4) of pixels.

[0077] As a result, similar to Embodiment 1, in both the case of viewing the first surface 7a of the display panel P from one direction and the case of viewing the second surface 7b of the display panel P from the other direction, it is possible to ensure readability while optimizing the display area and font size of the character information. Also, since mirror image characters are not visible, the visibility of the entire image can be enhanced.

[0078] (First Modified Example) FIGS. 11A and 11B are enlarged views of the character information display area according to the first modified example of Embodiment 2. FIG. 11C is a cross-sectional view taken along the line B-B shown in FIGS. 11A and 11B. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0079] In the configuration according to the first modified example of Embodiment 2, the plurality of first regions A1 are provided corresponding to a plurality of pixel columns in which pixels Pix1 are arranged in the Y direction (second direction), respectively. Also, the plurality of second regions A2 are provided corresponding to a plurality of pixel columns in which pixels Pix2 are arranged in the Y direction (second direction), respectively. In other words, the plurality of first regions A1 and the plurality of second regions A2 each include a plurality of pixel columns in the X direction (first direction). Here, an aspect in which the plurality of first regions A1 and the plurality of second regions A2 each include two pixel columns in the X direction (first direction) is illustrated.

[0080] Also, in the configuration according to the first modified example of Embodiment 2, the first region A1 and the second region A2 are alternately arranged in the X direction (first direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a vertical stripe-shaped light-shielding pattern in units of a plurality (here, two) of pixel columns.

[0081] As a result, similar to Embodiment 1, in both the case of viewing the first surface 7a of the display panel P from one direction and the case of viewing the second surface 7b of the display panel P from the other direction, it is possible to ensure readability while optimizing the display area and font size of the character information. Also, since mirror image characters are not visible, the visibility of the entire image can be enhanced.

[0082] (Second Modification Example) Figs. 12A and 12B are enlarged views of the character information display area according to the second modification example of Embodiment 2. Fig. 12C is a cross-sectional view taken along the line A-A shown in Figs. 12A and 12B. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0083] In the configuration according to the second modification example of Embodiment 2, the plurality of first regions A1 are provided corresponding to a plurality of pixel rows in which pixels Pix1 are arranged in the X direction (first direction), respectively. Also, the plurality of second regions A2 are provided corresponding to a plurality of pixel rows in which pixels Pix2 are arranged in the X direction (first direction), respectively. In other words, the plurality of first regions A1 and the plurality of second regions A2 each include a plurality of pixel rows in the Y direction (second direction). Here, an aspect in which the plurality of first regions A1 and the plurality of second regions A2 each include two pixel rows in the Y direction (second direction) is illustrated.

[0084] Also, in the configuration according to the second modification example of Embodiment 2, the first region A1 and the second region A2 are alternately arranged in the Y direction (second direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a horizontal stripe-shaped light-shielding pattern in units of a plurality (here, two) of pixel rows.

[0085] As a result, similar to Embodiment 1, in both the case of viewing the first surface 7a of the display panel P from one direction and the case of viewing the second surface 7b of the display panel P from the other direction, it is possible to ensure readability while optimizing the display area and font size of the character information. Also, since mirror-image characters are not visible, the visibility of the entire image can be improved.

[0086] (Embodiment 3) Figs. 13A and 13B are enlarged views of the character information display area according to Embodiment 3. Fig. 13C is a cross-sectional view taken along the line A-A shown in Figs. 13A and 13B. Fig. 13D is a cross-sectional view taken along the line B-B shown in Figs. 13A and 13B. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0087] In the configuration according to Embodiment 3, the plurality of first regions A1 are each provided corresponding to one or more pixels. Also, the plurality of second regions A2 are each provided corresponding to one or more pixels. In other words, the plurality of first regions A1 and the plurality of second regions A2 each include one or more pixels in the X direction (first direction). Also, the plurality of first regions A1 and the plurality of second regions A2 each include one or more pixels in the Y direction (second direction).

[0088] Also, in the configuration according to Embodiment 3, the first region A1 and the second region A2 are alternately arranged in the X direction (first direction). Also, the first region A1 and the second region A2 are alternately arranged in the Y direction (second direction). Thereby, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a checkered light-shielding pattern in units of one or more pixels.

[0089] As shown in FIGS. 13A, 13B, 13C, and 13D, in the configuration according to Embodiment 3, the first light-shielding pattern S1 and the second light-shielding pattern S2 overlap in a predetermined range including the boundary line between the first region A1 and the second region A2 indicated by a broken line in a plan view. Thereby, light leakage of the second region A2 when viewing the first surface 7a of the display panel P from one direction can be suppressed. Also, light leakage of the first region A1 when viewing the second surface 7b of the display panel P from the other direction can be suppressed.

[0090] (First Modification Example) FIGS. 14A and 14B are enlarged views of a character information display region according to the first modification example of Embodiment 3. FIG. 14C is a cross-sectional view taken along the line B-B shown in FIGS. 14A and 14B with an arrow. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0091] In the configuration according to the first modification of the third embodiment, the plurality of first regions A1 are provided corresponding to one or a plurality of pixel columns in which the pixels Pix1 are arranged in the Y direction (second direction), respectively. Also, the plurality of second regions A2 are provided corresponding to one or a plurality of pixel columns in which the pixels Pix2 are arranged in the Y direction (second direction), respectively. In other words, the plurality of first regions A1 and the plurality of second regions A2 each include one or a plurality of pixel columns in the X direction (first direction).

[0092] Also, in the configuration according to the first modification of the third embodiment, the first region A1 and the second region A2 are alternately arranged in the X direction (first direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a vertical stripe-shaped light-shielding pattern in units of one or a plurality of pixel columns.

[0093] As shown in FIGS. 14A, 14B, and 14C, in the configuration according to the first modification of the third embodiment, the first light-shielding pattern S1 and the second light-shielding pattern S2 overlap in a predetermined range including the boundary line between the first region A1 and the second region A2 indicated by a broken line in a plan view. Thus, similarly to the third embodiment, it is possible to suppress light leakage from the second region A2 when viewing the first surface 7a of the display panel P from one direction. Also, it is possible to suppress light leakage from the first region A1 when viewing the second surface 7b of the display panel P from the other direction.

[0094] (Second Modification) FIGS. 15A and 15B are enlarged views of the character information display region according to the second modification of the third embodiment. FIG. 15C is a cross-sectional view taken along the line A-A shown in FIGS. 15A and 15B. Note that descriptions similar to those of the first embodiment may be omitted.

[0095] In the configuration according to the second modification of Embodiment 3, the plurality of first regions A1 are each provided corresponding to one or a plurality of pixel rows in which pixels Pix1 are arranged in the X direction (first direction). Also, the plurality of second regions A2 are each provided corresponding to one or a plurality of pixel rows in which pixels Pix2 are arranged in the X direction (first direction). In other words, the plurality of first regions A1 and the plurality of second regions A2 each include one or a plurality of pixel rows in the Y direction (second direction).

[0096] Also, in the configuration according to the second modification of Embodiment 3, the first region A1 and the second region A2 are provided alternately in the Y direction (second direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a horizontal stripe-shaped light-shielding pattern in units of one or a plurality of pixel rows.

[0097] As shown in FIGS. 15A, 15B, and 15C, in the configuration according to the second modification of Embodiment 3, the first light-shielding pattern S1 and the second light-shielding pattern S2 overlap in a predetermined range including the boundary line between the first region A1 and the second region A2 indicated by a broken line in a plan view. Thus, similar to Embodiment 3, it is possible to suppress light leakage from the second region A2 when viewing the first surface 7a of the display panel P from one direction. Also, it is possible to suppress light leakage from the first region A1 when viewing the second surface 7b of the display panel P from the other direction.

[0098] (Embodiment 4) FIGS. 16A and 16B are enlarged views of the character information display region according to Embodiment 4. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0099] In the configuration according to Embodiment 4, the plurality of first regions A1 are each provided corresponding to a plurality of pixels Pix1. Also, the plurality of second regions A2 are each provided corresponding to a plurality of pixels Pix2.

[0100] In other words, each of the plurality of first regions A1 includes a plurality of pixels Pix1 in the X direction (first direction). Also, each of the plurality of second regions A2 includes a plurality of pixels Pix2 in the X direction (first direction). Here, an example is illustrated in which each of the plurality of first regions A1 includes four pixels Pix1 in the X direction (first direction), and each of the plurality of second regions A2 includes four pixels Pix2 in the X direction (first direction).

[0101] Also, each of the plurality of first regions A1 includes a plurality of pixels Pix1 in the Y direction (second direction). Also, each of the plurality of second regions A2 includes a plurality of pixels Pix2 in the Y direction (second direction). Here, an example is illustrated in which each of the plurality of first regions A1 includes four pixels Pix1 in the Y direction (second direction), and each of the plurality of second regions A2 includes four pixels Pix2 in the Y direction (second direction).

[0102] Also, in the configuration according to Embodiment 4, the first region A1 and the second region A2 are alternately arranged in the X direction (first direction). Also, the first region A1 and the second region A2 are alternately arranged in the Y direction (second direction). Thereby, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a checkered light-shielding pattern in units of a plurality (here, 4×4 = 16) of pixels.

[0103] As shown in FIGS. 16A and 16B, in the configuration according to Embodiment 4, the image processing circuit 70 performs image processing such that the luminance of the pixel Pix1 adjacent to the second region A2 of the first region A1 is lower than the luminance of the pixel Pix1' not adjacent to the second region A2 of the first region A1. Also, the image processing circuit 70 performs image processing such that the luminance of the pixel Pix2 adjacent to the first region A1 of the second region A2 is lower than the luminance of the pixel Pix2' not adjacent to the first region A1 of the second region A2. Thereby, light leakage of the second region A2 when the first surface 7a of the display panel P is viewed from one direction can be suppressed. Also, light leakage of the first region A1 when the second surface 7b of the display panel P is viewed from the other direction can be suppressed.

[0104] (First Modification Example) FIG. 17A and FIG. 17B are enlarged views of the character information display area according to the first modification of Embodiment 4. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0105] In the configuration according to the first modification of Embodiment 4, the plurality of first regions A1 are provided corresponding to a plurality of pixel columns in which pixels Pix1 are arranged in the Y direction (second direction), respectively. Also, the plurality of second regions A2 are provided corresponding to a plurality of pixel columns in which pixels Pix2 are arranged in the Y direction (second direction), respectively. In other words, the plurality of first regions A1 and the plurality of second regions A2 each include a plurality of pixel columns in the X direction (first direction). Here, an aspect in which the plurality of first regions A1 and the plurality of second regions A2 each include four pixel columns in the X direction (first direction) is illustrated.

[0106] Also, in the configuration according to the first modification of Embodiment 4, the first region A1 and the second region A2 are alternately arranged in the X direction (first direction). As a result, the first light-shielding pattern S1 and the second light-shielding pattern S2 each become a vertical stripe-shaped light-shielding pattern in units of a plurality (here, four) of pixel columns.

[0107] As shown in FIGS. 17A and 17B, in the configuration according to the first modification of Embodiment 4, the image processing circuit 70 performs image processing so that the luminance of the pixel Pix1 adjacent to the second region A2 of the first region A1 is lower than the luminance of the pixel Pix1' not adjacent to the second region A2 of the first region A1, in the same manner as in Embodiment 4. Also, the image processing circuit 70 performs image processing so that the luminance of the pixel Pix2 adjacent to the first region A1 of the second region A2 is lower than the luminance of the pixel Pix2' not adjacent to the first region A1 of the second region A2, in the same manner as in Embodiment 4. As a result, similar to Embodiment 4, light leakage from the second region A2 when the first surface 7a of the display panel P is viewed from one direction can be suppressed. Also, light leakage from the first region A1 when the second surface 7b of the display panel P is viewed from the other direction can be suppressed.

[0108] (Second Modification) Figures 18A and 18B are enlarged views of the character information display area according to the second modification of Embodiment 4. Note that descriptions similar to those in Embodiment 1 may be omitted.

[0109] In the configuration according to the second modification of Embodiment 4, the plurality of first regions A1 are provided corresponding to a plurality of pixel rows in which pixels Pix1 are arranged in the X direction (first direction), respectively. Also, the plurality of second regions A2 are provided corresponding to a plurality of pixel rows in which pixels Pix2 are arranged in the X direction (first direction), respectively. In other words, the plurality of first regions A1 and the plurality of second regions A2 each include a plurality of pixel rows in the Y direction (second direction). Here, an example is shown in which the plurality of first regions A1 and the plurality of second regions A2 each include four pixel rows in the Y direction (second direction).

[0110] Also, in the configuration according to the second modification of Embodiment 4, the first region A1 and the second region A2 are alternately arranged in the Y direction (second direction). Thereby, the first light shielding pattern S1 and the second light shielding pattern S2 each become a horizontal stripe-shaped light shielding pattern in units of a plurality (here, four) of pixel rows.

[0111] As shown in FIGS. 18A and 18B, in the configuration according to the second modification of Embodiment 4, the image processing circuit 70 performs image processing so that the luminance of the pixel Pix1 adjacent to the second region A2 of the first region A1 is lower than the luminance of the pixel Pix1' not adjacent to the second region A2 of the first region A1, in the same manner as in Embodiment 4. Also, the image processing circuit 70 performs image processing so that the luminance of the pixel Pix2 adjacent to the first region A1 of the second region A2 is lower than the luminance of the pixel Pix2' not adjacent to the first region A1 of the second region A2, in the same manner as in Embodiment 4. Thereby, similar to Embodiment 4, light leakage of the second region A2 when the first surface 7a of the display panel P is viewed from one direction can be suppressed. Also, light leakage of the first region A1 when the second surface 7b of the display panel P is viewed from the other direction can be suppressed.

[0112] In each of the above-described embodiments and variations, a transmissive liquid crystal display device that performs display output in the FSC method has been exemplified and described. However, the mode of the display panel P is not limited to a liquid crystal display device using the FSC method. The display panel P may be, for example, a transmissive color liquid crystal display panel in which a first sub-pixel in which a first color filter that passes a first color (for example, red (R)) is arranged in layers, a second sub-pixel in which a second color filter that passes a second color (for example, green (G)) is arranged in layers, and a third sub-pixel in which a third color filter that passes a third color (for example, blue (B)) is arranged in layers constitute one pixel. In this case, the first region A1 and the second region A2 may be configured with the first sub-pixel, the second sub-pixel, and the third sub-pixel as one unit. Alternatively, for example, the display panel P may be configured by an organic EL display device of a self-emitting type.

[0113] As described above, the preferred embodiments of the present disclosure have been described. However, the present disclosure is not limited to such embodiments. The content disclosed in the embodiments is merely an example, and various modifications are possible without departing from the spirit of the present disclosure. For example, appropriate modifications made without departing from the spirit of the present disclosure also naturally belong to the technical scope of the present invention.

Description of Reference Numerals

[0114] 3 Liquid crystal 7 Display area 7a First surface 7b Second surface 11 Light source 11R First light source 11G Second light source 11B Third light source 70 Image processing circuit 100 Display device 200a First character information 200b First character information (mirror image inversion) 300a Second character information (mirror image inversion) 300b Second character information A1 First region A2 Second region AA Character information display area AAa Character information display area (first surface) AAb Character information display area (second surface) DPM Display panel module L Light source device P Display panel Pix, Pix1, Pix1’, Pix2, Pix2’ Pixel S1 First light-shielding pattern S2 Second light-shielding pattern

Claims

1. A display panel having a display area in which a plurality of pixels are arranged in a first direction and a second direction intersecting the first direction, and capable of visually recognizing a mirror image of an image of the display area viewed from one direction from the other direction, At least a part of the display area is a plurality of first regions that are visible from one direction and have the other surface shielded from light, and a plurality of second regions that are visible from the other direction and have one surface shielded from light, including, a display device.

2. The first region and the second region are alternately arranged in the first direction, The display device according to Claim 1.

3. The first region and the second region are alternately arranged in the second direction, The display device according to Claim 1.

4. The first region and the second region are alternately arranged in the first direction, The first region and the second region are alternately arranged in the second direction, The display device according to Claim 1.

5. Each of the first region and the second region includes one pixel in the first direction, The display device according to Claim 2.

6. Each of the first region and the second region includes one pixel in the second direction, The display device according to Claim 3.

7. Each of the first region and the second region includes one pixel in the first direction, Each of the first region and the second region includes one pixel in the second direction, The display device according to Claim 4.

8. In a plan view, a light-shielding portion on the other surface of the first region and a light-shielding portion on one surface of the second region overlap in a predetermined range including a boundary line between the first region and the second region, The display device according to any one of Claims 5 to 7.

9. Each of the first region and the second region includes a plurality of pixels in the first direction, The display device according to Claim 2.

10. Each of the first region and the second region includes a plurality of pixels in the second direction, The display device according to Claim 3.

11. Each of the first region and the second region includes a plurality of pixels in the first direction, Each of the first region and the second region includes a plurality of pixels in the second direction, The display device according to Claim 4.

12. In a plan view, a light-shielding portion on the other surface of the first region and a light-shielding portion on one surface of the second region overlap in a predetermined range including a boundary line between the first region and the second region, The display device according to any one of Claims 9 to 11.

13. The luminance of the pixel adjacent to the second region in the first region is lower than the luminance of the pixel not adjacent to the second region in the first region. The luminance of the pixel adjacent to the first region in the second region is lower than the luminance of the pixel not adjacent to the first region in the second region. The display device according to any one of claims 9 to 11.

14. The luminance of the pixel adjacent to the second region in the first region is lower than the luminance of the pixel not adjacent to the second region in the first region. The luminance of the pixel adjacent to the first region in the second region is lower than the luminance of the pixel not adjacent to the first region in the second region. The display device according to claim 12.

Images