Indication device

Abstract

To provide a display device capable of improving display quality. [Solution] According to one embodiment, the display device comprises a display panel and a first light-emitting unit that irradiates light onto the display panel. The display panel comprises a first transparent substrate, a second transparent substrate, a liquid crystal layer located between the first and second transparent substrates and containing polymer-dispersed liquid crystal, a first wiring extending in a first direction, and a second wiring intersecting the first wiring. The second transparent substrate has a first side surface, and the edge of the first side surface extends along the first direction in a plan view. The first light-emitting unit comprises a plurality of first light-emitting elements having a first light-emitting surface and a plurality of second light-emitting elements having a second light-emitting surface. The plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged alternately along the first side surface. The first normal of the first light-emitting surface extends in a direction different from the first direction and a second direction perpendicular to the first direction. The second normal of the second light-emitting surface extends in a direction different from the first direction, the second direction, and the direction in which the first normal extends.

Description

Technical Field

[0001] Embodiments of the present invention relate to a display device.

Background Art

[0002] In recent years, various display devices using polymer dispersed liquid crystal (PDLC) that can be switched between a scattering state and a transparent state have been proposed. In one example, the display device includes a display panel including polymer dispersed liquid crystal and a light source disposed along a side surface of a transparent substrate.

[0003] A part of the illumination light emitted from the light source may be reflected by wiring perpendicular to its traveling direction. Reflection by the wiring is prominent in the wiring close to the light source. Therefore, such an undesired reflection causes a deterioration in display quality.

[0004] In order to avoid this problem, a technique of providing the wiring in a curved shape is known.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present embodiment is to provide a display device capable of improving display quality.

Means for Solving the Problems

[0007] According to one embodiment, the display device The device comprises a display panel and a first light-emitting unit that illuminates the display panel with light. The display panel comprises a first transparent substrate, a second transparent substrate superimposed on the first transparent substrate, a liquid crystal layer located between the first and second transparent substrates and containing polymer-dispersed liquid crystal, a first wiring located between the first transparent substrate and the liquid crystal layer and extending in a first direction, and a second wiring located between the first transparent substrate and the liquid crystal layer and intersecting the first wiring. The second transparent substrate has a first side surface, the edge of which extends along a first direction in a plan view. The first light-emitting unit comprises a plurality of first light-emitting elements having a first light-emitting surface that emits light, and a plurality of second light-emitting elements having a second light-emitting surface that emits light. The plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged alternately along the first side surface. The first normal of the first light-emitting surface extends in a direction different from the first direction and a second direction perpendicular to the first direction. The second normal of the second light-emitting surface extends in a direction different from the first direction, the second direction, and the direction in which the first normal extends. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a plan view showing the configuration of a display device according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view of the display device along the line A and B shown in Figure 1. [Figure 3] Figure 3 is an enlarged view of the first light-emitting section shown in Figure 1. [Figure 4] Figure 4 is a magnified view of the first light-emitting element shown in Figure 3. [Figure 5] Figure 5 shows an example of the wiring layout included in the display panel shown in Figure 1. [Figure 6] Figure 6 is a cross-sectional view of the display device along the CD line shown in Figure 5. [Figure 7] Figure 7 is a magnified view of a portion of the display device shown in Figure 1. [Figure 8] Figure 8 is a schematic diagram illustrating how the light-emitting element shown in Figure 7 illuminates the display panel. [Figure 9] Figure 9 is an enlarged view of the light guide, the first light-emitting element, and a portion of the second light-emitting element shown in Figure 2. [Figure 10] FIG. 10 is an enlarged view of a part of the light guide, the first light emitting element, and the second light emitting element shown in FIG. 2. [Figure 11] FIG. 11 is a diagram showing the layout of the wiring portion included in the display device according to the comparative example of the first embodiment. [Figure 12] FIG. 12 is a plan view showing the configuration of the display device according to the second embodiment. [Figure 13] FIG. 13 is an enlarged view of the first light emitting element shown in FIG. 12. [Figure 14] FIG. 14 is a cross-sectional view of the display device according to the modified example. [Figure 15] FIG. 15 is a plan view of the display device according to the third embodiment. [Figure 16] FIG. 16 is an enlarged view of a part of the display device shown in FIG. 15. [Figure 17] FIG. 17 is a diagram showing only the light emitting elements of the display device shown in FIG. 15. [Figure 18] FIG. 18 is a diagram schematically showing how the light emitting element irradiates light on the display panel in the display device according to the third embodiment. [Figure 19] FIG. 19 is a plan view of the display device according to the fourth embodiment. [Figure 20] FIG. 20 is a diagram showing only the light emitting elements of the display device shown in FIG. 19. [Figure 21] FIG. 21 is a diagram schematically showing how the light emitting element irradiates light on the display panel in the display device according to the fourth embodiment. Embodiments for Carrying Out the Invention

[0009] Some embodiments will be described with reference to the drawings. 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 invention, they are naturally included in the scope of the present invention. Also, for the sake of clearer explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but it is merely an example and does not limit the interpretation of the present invention. Further, in this specification and each figure, components that exhibit the same or similar functions as those previously described with respect to the already presented figures may be given the same reference numerals, and detailed descriptions that are redundant may be appropriately omitted.

[0010] In the drawings, for the sake of easier understanding as necessary, the X-axis, Y-axis, and Z-axis are described. The direction along the X-axis is referred to as the first direction X, the direction along the Y-axis is referred to as the second direction Y, and the direction along the Z-axis is referred to as the third direction Z. Looking at various elements parallel to the third direction Z is called a plan view. In one example, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but they may intersect at an angle other than 90 degrees.

[0011] In the following description, "overlay" not only includes the case where another element overlaps the target element from the third direction Z, but also includes the case where it overlaps from the direction opposite to the third direction Z. Also, "overlap" includes not only the case where the target elements are in direct contact with each other, but also the state where the target elements are spaced apart or the state where other elements are located between the target elements.

[0012] Also, in the following description, terms indicating the positional relationship between two or more components such as "above", "upper", "between", "opposite", etc. include not only the case where the two or more target components are in direct contact with each other, but also the case where they are separated from each other by a gap or other components in between.

[0013] In the example shown in the figure, the display device is positioned such that the first direction X coincides with the horizontal direction (left-right direction) of the display device. Furthermore, the display device is positioned such that the second direction Y coincides with the vertical direction (up-down direction) of the display device. Additionally, the display device is positioned such that the third direction Z coincides with the thickness direction of the display device. In the example shown in the figure, a positive direction X corresponds to the right of the display device and display panel, and a negative direction X corresponds to the left of the display device and display panel. In the example shown in the figure, a positive direction Y corresponds to the top of the display device and display panel, and a negative direction Y corresponds to the bottom of the display device and display panel. In the example shown in the figure, a positive direction Z corresponds to the back (back) of the display device, and a negative direction Z corresponds to the front (front) of the display device. The display device according to this embodiment displays an image to the front.

[0014] [First Embodiment] Figure 1 is a plan view showing the configuration of a display device DSP according to the first embodiment.

[0015] The display device DSP comprises a display panel PA and a first light-emitting unit LP1. The display panel PA comprises a first transparent substrate 110, a second transparent substrate 120, a liquid crystal layer LC, and a seal SE. Each of the first transparent substrate 110 and the second transparent substrate 120 is formed in a flat plate shape parallel to the XY plane defined by the first direction X and the second direction Y, and they overlap each other in a plan view. The first transparent substrate 110 extends further in the second direction Y than the second transparent substrate 120. In the illustrated example, both the first transparent substrate 110 and the second transparent substrate 120 are formed in a rectangular shape, but are not limited to this. For example, the first transparent substrate 110 and the second transparent substrate 120 may be any shape other than a rectangle, such as a polygon, circle, ellipse, or semicircle.

[0016] The second transparent substrate 120 has a first side surface SS1, the edge of which extends along a first direction X in a plan view.

[0017] The liquid crystal layer LC is located between the first transparent substrate 110 and the second transparent substrate 120 and is sealed by a seal SE. In the example shown schematically in an enlarged view in Figure 1, the liquid crystal layer LC comprises a polymer-dispersed liquid crystal containing a polymer PL and liquid crystal molecules LM. In one example, the polymer PL is a liquid crystalline polymer and is formed in streaks extending along a first direction X. The liquid crystal molecules LM are dispersed in the gaps of the polymer PL and are oriented so that their long axes are aligned along the first direction X. Both the polymer PL and the liquid crystal molecules LM have optical anisotropy or refractive index anisotropy. The responsiveness of the polymer PL to the electric field is lower than that of the liquid crystal molecules LM to the electric field.

[0018] In one example, the orientation direction of the polymer PL remains almost unchanged regardless of the presence or absence of an electric field. On the other hand, the orientation direction of the liquid crystal molecules LM changes in response to the electric field when a voltage above a threshold is applied to the liquid crystal layer LC. When no voltage is applied to the liquid crystal layer LC, the optical axes of the polymer PL and liquid crystal molecules LM are parallel to each other. Therefore, light incident on the liquid crystal layer LC is transmitted through with almost no scattering (transparent state). When a voltage is applied to the liquid crystal layer LC, the optical axes of the polymer PL and liquid crystal molecules LM intersect each other. Therefore, light incident on the liquid crystal layer LC is scattered within the liquid crystal layer LC (scattered state).

[0019] The composition of polymer-dispersed liquid crystals, including polymer PL and liquid crystal molecules LM, is not limited to the examples described above.

[0020] The display panel PA has a display area DA for displaying an image. The display area DA comprises multiple pixels PX arranged in a matrix in a first direction X and a second direction Y. In the illustrated example, the display area DA is formed as a rectangle as shown by the dashed line, but it is not limited to this. For example, the display area DA may be any shape other than a rectangle, such as a polygon, circle, ellipse, or semicircle.

[0021] As shown in the enlarged view in Figure 1, each pixel PX is equipped with a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, etc. The switching element SW is composed of, for example, a thin-layer transistor (TFT) and is electrically connected to the scan line G (first wiring) and the signal line S (second wiring). The scan line G extends in the first direction X and is electrically connected to the switching element SW in each of the pixels PX aligned in the first direction X. The signal line S extends in the second direction Y, intersects with the scan line G, and is electrically connected to the switching element SW in each of the pixels PX aligned in the second direction Y. In the example shown in the figure, the signal line S and the scan line G are orthogonal, but the direction in which the signal line S extends is not limited to this. That is, the signal line S may extend in a direction different from the second direction Y. The pixel electrode PE is electrically connected to the switching element SW. Each pixel electrode PE faces the common electrode CE and drives the liquid crystal layer LC (particularly the liquid crystal molecules LM) by the electric field generated between the pixel electrode PE and the common electrode CE. Capacitance CS is formed, for example, between an electrode at the same potential as the common electrode CE and an electrode at the same potential as the pixel electrode PE.

[0022] The scan lines G, signal lines S, switching elements SW, and pixel electrodes PE are formed between the first transparent substrate 110 and the liquid crystal layer LC. The common electrode CE is formed between the second transparent substrate 120 and the liquid crystal layer LC.

[0023] IC chips CP and flexible printed circuit boards (not shown) are mounted on the first transparent substrate 110.

[0024] The first light-emitting unit LP1 is configured to emit illumination light to illuminate the liquid crystal layer LC onto the display panel PA. The first light-emitting unit LP1 faces the first side surface SS1 of the display panel PA.

[0025] The first light-emitting unit LP1 comprises a plurality of light-emitting elements LE and a circuit board CI. The plurality of light-emitting elements LE are mounted on the circuit board CI. Furthermore, the plurality of light-emitting elements LE are arranged at intervals along the first side surface SS1 of the second transparent substrate 120. In other words, the plurality of light-emitting elements LE are arranged at intervals along the first direction X.

[0026] The light-emitting element (LE), though not described in detail, comprises a red light-emitting section, a green light-emitting section, and a blue light-emitting section. These red, green, and blue light-emitting sections may be lit sequentially, or all of them may be lit simultaneously.

[0027] Figure 2 is a cross-sectional view of the DSP display device along the AB line shown in Figure 1.

[0028] The first transparent substrate 110 and the second transparent substrate 120 are, for example, glass substrates, but may also be resin substrates.

[0029] The second transparent substrate 120 has a main surface 20A facing the first transparent substrate 110 in the third direction Z, and a back surface 20B located on the opposite side of the main surface 20A. The first side surface SS1 connects the main surface 20A and the back surface 20B. The second transparent substrate 120 also has a second side surface SS2 located on the opposite side of the first side surface SS1, which connects the main surface 20A and the back surface 20B. Both the first side surface SS1 and the second side surface SS2 are parallel to the XZ plane defined by the first direction X and the third direction Z.

[0030] The liquid crystal layer LC is located between the first transparent substrate 110 and the second transparent substrate 120. Each pixel electrode PE of a pixel PX is located between the first transparent substrate 110 and the liquid crystal layer LC and is covered with a first alignment film AL1. A common electrode CE facing multiple pixel electrodes PE is located between the second transparent substrate 120 and the liquid crystal layer LC and is covered with a second alignment film AL2. The liquid crystal layer LC is in contact with the first alignment film AL1 and the second alignment film AL2. The pixel electrodes PE and the common electrode CE are transparent electrodes formed from a transparent conductive material such as indium tin oxide (ITO).

[0031] The display device DSP further includes a light guide LG located between the second transparent substrate 120 and the first light-emitting section LP1. The light guide LG is formed of, for example, glass or resin. The light guide LG faces the first side surface SS1 with an air layer in between.

[0032] In Figure 2, the first light-emitting unit LP1 is shown with a simplified representation of its configuration. The first light-emitting unit LP1 is configured to emit illumination light toward the second transparent substrate 120. The illumination light emitted from the first light-emitting unit LP1 first enters the light guide LG and then passes through the light guide LG. The illumination light that has passed through the light guide LG enters the second transparent substrate 120 from the first side surface SS1.

[0033] The second transparent substrate 120 functions as a light guide plate that propagates illumination light along the second direction Y. In one example, illumination light incident from the first side surface SS1 propagates within the display panel PA, undergoing repeated total internal reflection between the outer surface of the first transparent substrate 110 (the interface between the transparent substrate and air) and the outer surface of the second transparent substrate 120. A portion of the propagated illumination light is emitted from the main surface 20A. The illumination light emitted from the main surface 20A then reaches the liquid crystal layer LC. The light that reaches the liquid crystal layer LC is used to display an image.

[0034] Figure 3 is an enlarged view of the first light-emitting unit LP1 shown in Figure 1. In Figure 3, some of the components of the first light-emitting unit LP1 are omitted.

[0035] The first light-emitting unit LP1 comprises a circuit board CI and a plurality of light-emitting elements LE. The plurality of light-emitting elements LE are mounted on the mounting surface MS of the circuit board CI. The plurality of light-emitting elements LE comprises a plurality of first light-emitting elements LE1 and a plurality of second light-emitting elements LE2.

[0036] Multiple first light-emitting elements LE1 and multiple second light-emitting elements LE2 are arranged alternately along the first side surface SS1 of the second transparent substrate 120. In other words, multiple first light-emitting elements LE1 and multiple second light-emitting elements LE2 are arranged alternately along the first direction X.

[0037] As shown in a more magnified view in Figure 3, the first light-emitting element LE1 has a first light-emitting surface EM1. The second light-emitting element LE2 has a second light-emitting surface EM2. In the example shown in Figure 3, the first light-emitting surface EM1 and the second light-emitting surface EM2 are orthogonal to the mounting surface MS. The first light-emitting element LE1 and the second light-emitting element LE2 have an anode AN and a cathode CA on the surface facing the mounting surface MS.

[0038] The first normal vector N1, which is a straight line perpendicular to the first light-emitting surface EM1, extends in a direction different from the first direction X and the second direction Y. The first normal vector N1 is inclined clockwise by a first angle θ1 in a plan view with respect to the second direction Y. The second normal vector N2, which is a straight line perpendicular to the second light-emitting surface EM2, extends in a direction different from the first direction X, the second direction Y, and the first normal vector N1. The second normal vector N2 is inclined counterclockwise by a second angle θ2 in a plan view with respect to the second direction Y. Both the first angle θ1 and the second angle θ2 are greater than 0 degrees and less than or equal to 45 degrees. In one example, the first angle θ1 and the second angle θ2 are equivalent.

[0039] In the illustrated example, the first normal vector N1 is tilted to the right of the display device DSP, and the first light-emitting surface EM1 faces to the right of the display device DSP. Also, the second normal vector N2 is tilted to the left of the display device DSP, and the second light-emitting surface EM2 faces to the left of the display device DSP. In other words, on the circuit board CI, the first light-emitting element LE1, which faces to the right of the display device DSP, and the second light-emitting element LE2, which faces to the left of the display device DSP, are arranged alternately.

[0040] Multiple mounting terminals MT are provided on the mounting surface MS. Each of the multiple mounting terminals MT includes a positive terminal PT and a negative terminal NT. Multiple first light-emitting elements LE1 and multiple second light-emitting elements LE2 are mounted on the mounting surface MS of the circuit board CI by the mounting terminals MT. In the illustrated example, one light-emitting element LE is mounted on the circuit board CI by one positive terminal PT and one negative terminal NT.

[0041] The anode AN of one first light-emitting element LE1 is electrically connected to the positive terminal PT, and the cathode CA is electrically connected to the negative terminal NT. The anode AN of one second light-emitting element LE2 is electrically connected to the positive terminal PT, and the cathode CA is electrically connected to the negative terminal NT.

[0042] Multiple first light-emitting elements LE1 and multiple second light-emitting elements LE2 are superimposed on each other with respect to the circuit board CI in a plan view. The mounting terminals MT are located between the circuit board CI and each light-emitting element LE. In a plan view, the multiple mounting terminals MT are arranged in a staggered pattern on the mounting surface MS. At this time, multiple positive terminals PT and negative terminals NT are arranged alternately in a plan view. A pair of positive terminals PT and negative terminals NT are arranged diagonally on the mounting surface MS (in a direction intersecting the first direction X and the second direction Y). In the display device DSP according to the first embodiment, the orientation of the first normal N1 and the second normal N2 can be adjusted by the layout of the mounting terminals MT. In other words, in the display device DSP according to the first embodiment, the layout of the mounting terminals MT can be determined according to the required orientation of the first normal N1 and the second normal N2.

[0043] Figure 4 is an enlarged view of the first light-emitting element LE1 shown in Figure 3. The structure of the light-emitting element LE will be explained with reference to Figure 4. In Figure 4, one first light-emitting element LE1 is shown as an example, but the other first light-emitting elements LE1 and the second light-emitting elements LE2 have a similar structure.

[0044] In Figure 4, the surface indicated by vertical stripes is the first light-emitting surface EM1. Here, the first light-emitting element LE1 has an anode AN and a cathode CA on the surface adjacent to the first light-emitting surface EM1. That is, the mounting terminal MT shown in Figure 3 is in contact with the first light-emitting element LE1 on the surface adjacent to the first light-emitting surface EM1. With this side-view structure, when the first light-emitting element LE1 is mounted on the circuit board CI, the first light-emitting surface EM1 and the mounting surface MS are orthogonal.

[0045] Figure 5 shows an example of the wiring layout included in the display panel PA.

[0046] Multiple scan lines G each extend in a first direction X and are aligned in a second direction Y. Multiple signal lines S each extend in a second direction Y and are aligned in the first direction X. The switching element SW, shown in a simplified diagram here, is located at the intersection of the scan lines G and the signal lines S.

[0047] The light L1 (white arrow in the figure) emitted from the first light-emitting surface EM1 of the first light-emitting element LE1 mainly travels along the first normal N1. In other words, the light L1 travels at a rightward tilt relative to the display panel PA.

[0048] The light L2 (white arrow in the figure) emitted from the second light-emitting surface EM2 of the second light-emitting element LE2 mainly travels along the second normal N2. In other words, the light L2 travels at a leftward tilt relative to the display panel PA.

[0049] In this state, light sources L1 and L2 are almost perpendicular to the scan line G. This suppresses the reflection of illumination light from the first light-emitting element LE1 and the second light-emitting element LE2 onto the display panel PA by the scan line G. In other words, the display quality of the image displayed by the display device DSP is improved.

[0050] Furthermore, in the display device DSP according to the first embodiment, the wiring length can be shortened compared to the case where the wiring is curved. This suppresses the increase in wiring resistance and capacitance, making it possible to improve display quality and reduce power consumption.

[0051] Figure 6 is a cross-sectional view of the DSP display device along the CD line shown in Figure 5.

[0052] The insulating layer 111 is located on the first transparent substrate 110. The scanning line G is located on the insulating layer 111. The insulating layer 112 is located on the insulating layer 111. These insulating layers 111 and 112 are inorganic insulating layers formed from, for example, silicon oxide, silicon nitride, or silicon oxynitride. The insulating layer IL is located on the insulating layer 112. The insulating layer IL is an organic insulating layer. The transparent electrode TE covers the insulating layer IL. The insulating layer 113 is located on the insulating layer 112 and covers the transparent electrode TE. The pixel electrode PE is located on the insulating layer 113. The insulating layer 113 is interposed between the transparent electrode TE and the pixel electrode PE. The first alignment film AL1 covers the pixel electrode PE and the insulating layer 113 and is in contact with the liquid crystal layer LC.

[0053] The scan line G is positioned on an insulating layer 111 and covered by an insulating layer 112. The scan line G is a multilayer body including, for example, an aluminum layer formed of an aluminum-based material and a titanium layer formed of a titanium-based material.

[0054] The signal line S is placed on the insulating layer 112 and covered with the insulating layer IL. The signal line S is a multilayer, for example, containing a titanium layer and an aluminum layer.

[0055] The materials forming the scan lines G and signal lines S are not limited to the examples above. For example, the signal lines S may include a molybdenum layer formed from a molybdenum-based material.

[0056] The light-shielding layer BM is positioned between the second transparent substrate 120 and the liquid crystal layer LC. Furthermore, the light-shielding layer BM is located directly above the scan lines G and signal lines S. Although not shown in the diagram, the light-shielding layer BM is also located directly above the switching element SW.

[0057] The common electrode CE faces the pixel electrode PE in the third direction Z and covers the light-shielding layer BM. The second alignment layer AL2 covers the common electrode CE and is in contact with the liquid crystal layer LC.

[0058] Figure 7 is an enlarged view of a portion of the display device DSP shown in Figure 1. Referring to Figure 7, the arrangement of the light-emitting elements LE in the first light-emitting section LP1 will be explained in more detail. As mentioned above, in the first light-emitting section LP1, the first light-emitting element LE1 and the second light-emitting element LE2 are arranged alternately along the first direction X, forming a row.

[0059] Now, let's look at the light-emitting elements LE located at the ends of the column. As shown in a more magnified view in Figure 7, the light-emitting element T-LE1 located at the left end of the column is one of several first light-emitting elements LE1. That is, the light-emitting element T-LE1 emits illumination light that is tilted to the right, from the left end of the display device DSP toward the display area DA. Similarly, the light-emitting element T-LE2 located at the right end of the column is one of several second light-emitting elements LE2. That is, the light-emitting element T-LE2 emits illumination light that is tilted to the left, from the right end of the display device DSP toward the display area DA.

[0060] In other words, as the light-emitting element T-LE1 moves in the positive direction of the first direction X, the distance between the light-emitting surface and the first side surface SS1 increases. Similarly, as the light-emitting element T-LE2 moves in the positive direction of the first direction, the distance between the light-emitting surface and the first side surface SS1 decreases.

[0061] To put it another way, light-emitting element T-LE1 faces the adjacent second light-emitting element LE2 in the first direction X. Also, light-emitting element T-LE2 faces the adjacent first light-emitting element LE1 in the first direction X.

[0062] Figure 8 is a schematic diagram showing how the light-emitting elements T-LE1 and T-LE2, shown in Figure 7, illuminate the display panel PA. In Figure 8, the display panel PA is shown with some of its components omitted. In Figure 8, the illumination area IA, which is illuminated by the illumination light emitted from the light-emitting elements T-LE1 and T-LE2, is represented by a dotted line.

[0063] In the example display device DSP, the light-emitting element T-LE1 emits illumination light directed toward the display area DA, tilted to the right. In this case, most of the illumination area IA of the light-emitting element T-LE1 is included in the display area DA. Therefore, the brightness is improved in the display device DSP according to the first embodiment compared to the case where the light-emitting element LE located at the left end of the column is the second light-emitting element LE2 instead of the first light-emitting element LE1.

[0064] Furthermore, in the example display device DSP, the light-emitting element T-LE2 emits illumination light that is tilted to the left and directed towards the display area DA. In this case, most of the illumination area IA of the light-emitting element T-LE2 is included in the display area DA of the display panel PA. Therefore, compared to the case where the light-emitting element LE located at the right end of the column is the first light-emitting element LE1 instead of the second light-emitting element LE2, the brightness is improved in the display device DSP according to the first embodiment.

[0065] Figures 9 and 10 illustrate preferred shape examples for the light guide LG shown in Figure 2.

[0066] Figure 9 shows an example configuration of the light guide LG of the first embodiment. The light guide LG has a first light-receiving surface EN1 and a second light-receiving surface EN2. The first light-receiving surface EN1 is parallel to the first light-emitting surface EM1, and the second light-receiving surface EN2 is parallel to the second light-emitting surface EM2. Illumination light emitted from the first light-emitting surface EM1 is incident on the light guide LG along the direction normal to the first light-receiving surface EN1. Illumination light emitted from the second light-emitting surface EM2 is incident on the light guide LG along the direction normal to the second light-receiving surface EN2.

[0067] As a result, reflection of illumination light emitted from the first light-emitting element LE1 at the first light-receiving surface EN1 is suppressed, and reflection of illumination light emitted from the second light-emitting element LE2 at the second light-receiving surface EN2 is suppressed. Therefore, the illumination light emitted from the first light-emitting element LE1 and the second light-emitting element LE2 is efficiently incident on the light guide LG. Thus, the display panel PA can be illuminated with high-brightness illumination light.

[0068] Figure 10 shows another configuration example of the light guide LG of the first embodiment. In the example shown in Figure 10, the display device DSP further includes an auxiliary light guide SLG separate from the light guide LG. The auxiliary light guide SLG is made of the same material as the light guide LG. The auxiliary light guide SLG is bonded to the light guide LG with a transparent adhesive. The refractive index of the adhesive is equivalent to that of the auxiliary light guide SLG and the light guide LG. Therefore, unwanted reflections between the auxiliary light guide SLG and the light guide LG are suppressed.

[0069] The auxiliary light guide SLG has a first light-receiving surface EN1 parallel to the first light-emitting surface EM1 and a second light-receiving surface EN2 parallel to the second light-emitting surface EM2. Furthermore, the auxiliary light guide SLG is in contact with the light guide LG at the surface connecting the first light-receiving surface EN1 and the second light-receiving surface EN2. The configuration example shown in Figure 10 can achieve the same effect as the configuration example shown in Figure 9. That is, the illumination light emitted from the first light-emitting element LE1 and the second light-emitting element LE2 is efficiently incident on the light guide LG. Therefore, the display panel PA can be illuminated with high-brightness illumination light.

[0070] [Comparative Example] Figure 11 shows the wiring layout of the display device DSP1 according to a comparative example of the first embodiment.

[0071] The comparative example display device DSP1 includes a display panel PA with the same configuration as the first embodiment.

[0072] As shown in Figure 11, in the comparative example display device DSP1, the normal vector N, which is a straight line perpendicular to the light-emitting surface EM of the multiple light-emitting elements LE, extends along the second direction Y.

[0073] Light L (white arrow in the figure) emitted from the light-emitting surface EM mainly travels along the normal N. That is, the direction of propagation of light L is roughly perpendicular to the scan line G extending along the first direction X. Consequently, the illumination light illuminating the display panel PA is easily reflected by the scan line G and leaks outside the display panel, which can be one of the causes of deterioration in display quality.

[0074] On the other hand, in the display device DSP according to the first embodiment, the first normal N1 is tilted clockwise in a plan view with respect to the second direction Y. Also, in the display device DSP according to the first embodiment, the second normal N2 is tilted counterclockwise in a plan view with respect to the second direction Y (see Figure 5). Therefore, as described above, the display device DSP according to the first embodiment can suppress the reflection of illumination light on the scan lines G. This improves the display quality of the image displayed by the display device DSP.

[0075] [Second Embodiment] Figure 12 is a plan view showing the configuration of a display device DSP according to the second embodiment.

[0076] The second embodiment differs from the first embodiment in that the first light-emitting element LE1 and the second light-emitting element LE2 are mounted on an inclined mounting surface MS. The following description will focus on the differences, while other components are the same as in the first embodiment, and detailed descriptions may be omitted.

[0077] The mounting surface MS of the circuit board CI includes a first inclined surface BS1 on which the first light-emitting element LE1 is mounted, and a second inclined surface BS2 on which the second light-emitting element LE2 is mounted. The first inclined surface BS1 is parallel to the first light-emitting surface EM1. The second inclined surface BS2 is parallel to the second light-emitting surface EM2.

[0078] Figure 13 is an enlarged view of the first light-emitting element LE1 shown in Figure 12. The structure of the light-emitting element LE will be explained with reference to Figure 13. In Figure 13, one first light-emitting element LE1 is shown as an example, but the other first light-emitting elements LE1 and the second light-emitting elements LE2 have a similar structure.

[0079] In Figure 13, the surface indicated by vertical stripes is the first light-emitting surface EM1. Here, the first light-emitting element LE1 has an anode AN and a cathode CA on the surface opposite to the first light-emitting surface EM1. That is, the mounting terminal MT is in contact with the first light-emitting element LE1 on the surface opposite to the first light-emitting surface EM1. With this top-view structure, when the first light-emitting element LE1 is mounted on the circuit board CI, the first light-emitting surface EM1 and the mounting surface MS become parallel.

[0080] In the second embodiment, the same effects as in the first embodiment can be obtained. That is, the display device DSP according to the second embodiment can suppress the reflection of illumination light on the scan line G. Therefore, the display quality of the image displayed by the display device DSP is improved.

[0081] [Differentiation] Figure 14 is a cross-sectional view of a modified display device DSP.

[0082] The modified display device DSP includes a first light-emitting unit LP1 and a light guide LG similar to those in the first embodiment. In Figure 14, the first light-emitting unit LP1 is shown in a simplified form.

[0083] The modified display device DSP includes a display panel PA. The modified display panel PA differs from the display panel of the first embodiment in that it further includes a third transparent substrate 130 and a fourth transparent substrate 140. Each of the first transparent substrate 110, the second transparent substrate 120, the third transparent substrate 130, and the fourth transparent substrate 140 is formed in a flat plate shape parallel to the XY plane defined by the first direction X and the second direction Y, and superimposed on each other from the third direction Z. The third transparent substrate 130 and the fourth transparent substrate 140 are, for example, glass substrates, but may also be resin substrates.

[0084] The liquid crystal layer LC is sealed between the first transparent substrate 110 and the third transparent substrate 130 by a seal SE.

[0085] Each pixel electrode PE of a pixel PX is located between the first transparent substrate 110 and the liquid crystal layer LC and is covered with the first alignment film AL1. A common electrode CE facing multiple pixel electrodes PE is located between the third transparent substrate 130 and the liquid crystal layer LC and is covered with the second alignment film AL2. The liquid crystal layer LC is in contact with the first alignment film AL1 and the second alignment film AL2.

[0086] The fourth transparent substrate 140 is located on the outside of the first transparent substrate 110. The fourth transparent substrate 140 and the first transparent substrate 110 are bonded together by a first adhesive layer AD1 located between the two substrates. The fourth transparent substrate 140 functions, for example, as a cover member.

[0087] The second transparent substrate 120 is located outside the third transparent substrate 130. The second transparent substrate 120 and the third transparent substrate 130 are bonded together by a second adhesive layer AD2 located between the two substrates. In this configuration, the second transparent substrate 120 functions as a cover member and is thicker than the first transparent substrate 110 and the third transparent substrate 130 that sandwich the liquid crystal layer LC.

[0088] The first adhesive layer AD1 and the second adhesive layer AD2 have refractive indices equivalent to those of the first transparent substrate 110, the second transparent substrate 120, the third transparent substrate 130, and the fourth transparent substrate 140. Therefore, unwanted interfacial reflections are suppressed between the second transparent substrate 120 and the third transparent substrate 130, and between the first transparent substrate 110 and the fourth transparent substrate 140.

[0089] In the modified version, the same effects as in the first embodiment can be obtained. That is, the DSP display device according to the modified version can suppress the reflection of illumination light on the scan line G. Therefore, the display quality of the image displayed by the DSP display device is improved.

[0090] The modified display device DSP may have a light-emitting section similar to that of the display device according to the first embodiment. That is, the modified display device DSP may have a light-emitting element LE with a side-view structure as shown in the first embodiment. Furthermore, the modified display device DSP may have a light-emitting section similar to that of the display device according to the second embodiment. That is, the modified display device DSP may have a light-emitting element LE with a top-view structure as shown in the second embodiment.

[0091] [Third Embodiment] Figure 15 is a plan view of a display device DSP according to the third embodiment.

[0092] The display device DSP according to the third embodiment includes a first light-emitting unit LP1 and a display panel PA, similar to those in the first embodiment.

[0093] The display device DSP according to the third embodiment further comprises a second light-emitting unit LP2 located on the opposite side of the first light-emitting unit LP1, with the display panel PA in between.

[0094] The second light-emitting unit LP2 can be configured in the same way as the first light-emitting unit LP1.

[0095] Specifically, the second light-emitting unit LP2 is configured to emit illumination light to the display panel PA for illuminating the liquid crystal layer LC. The second light-emitting unit LP2 comprises a plurality of light-emitting elements LE and a circuit board CI. The plurality of light-emitting elements LE are mounted on the circuit board CI.

[0096] Furthermore, the second light-emitting unit LP2 faces the second side surface SS2 of the display panel PA.

[0097] Multiple light-emitting elements LE are configured to irradiate illumination light onto the second side surface SS2 of the second transparent substrate 120. The multiple light-emitting elements LE provided in the second light-emitting unit LP2 include multiple third light-emitting elements LE3 and multiple fourth light-emitting elements LE4.

[0098] Multiple third light-emitting elements LE3 and multiple fourth light-emitting elements LE4 are arranged alternately along the second side surface SS2 of the second transparent substrate 120. In other words, multiple third light-emitting elements LE3 and multiple fourth light-emitting elements LE4 are arranged alternately along the first direction X.

[0099] The third light-emitting element LE3 has a third light-emitting surface EM3. The fourth light-emitting element LE4 has a fourth light-emitting surface EM4. The third and fourth light-emitting elements LE3 and LE4 may have the side view structure shown in the first embodiment. The third and fourth light-emitting elements LE3 and LE4 may also have the top view structure shown in the second embodiment.

[0100] The third normal vector N3, which is a straight line perpendicular to the third light-emitting surface EM3, extends in a direction different from the first direction X and the second direction Y. The third normal vector N3 is inclined clockwise by a third angle θ3 in a plan view, with respect to the second direction Y. The fourth normal vector N4, which is a straight line perpendicular to the fourth light-emitting surface EM4, extends in a direction different from the first direction X, the second direction Y, and the third normal vector N3. The fourth normal vector N4 is inclined counterclockwise by a fourth angle θ4 in a plan view, with respect to the second direction Y. Both the third angle θ3 and the fourth angle θ4 are greater than 0 degrees and less than or equal to 45 degrees. In one example, the third angle θ3 and the fourth angle θ4 are equivalent.

[0101] In the illustrated example, the third normal vector N3 is tilted to the left of the display device DSP, and the third light-emitting surface EM3 faces to the left of the display device DSP. Also, the fourth normal vector N4 is tilted to the right of the display device DSP, and the fourth light-emitting surface EM4 faces to the right of the display device DSP.

[0102] Figure 16 is an enlarged view of a portion of the display device DSP shown in Figure 15. Referring to Figure 16, an example of the arrangement of light-emitting elements LE in the first light-emitting section LP1 and the second light-emitting section LP2 will be explained in more detail.

[0103] As described above, in the first light-emitting section LP1, the first light-emitting element LE1 and the second light-emitting element LE2 are arranged alternately along the first direction, forming a row. Similarly, in the second light-emitting section LP2, the third light-emitting element LE3 and the fourth light-emitting element LE4 are arranged alternately along the first direction, forming a row.

[0104] Now, let's look at the light-emitting elements LE located at the ends of these rows. In the second light-emitting section LP2, the light-emitting element T-LE3 located at the left end of the row is one of several third light-emitting elements LE3. That is, the light-emitting element T-LE3 emits illumination light that is tilted to the left, from the left end of the display device DSP toward the display area DA. Also, the light-emitting element T-LE4 located at the right end of the row is one of several fourth light-emitting elements LE4. That is, the light-emitting element T-LE4 emits illumination light that is tilted to the right, from the right end of the display device DSP toward the display area DA.

[0105] In other words, as the light-emitting element T-LE3 moves in the positive direction of the first direction X, the distance between the light-emitting surface and the second side surface SS2 decreases. Conversely, as the light-emitting element T-LE4 moves in the positive direction of the first direction, the distance between the light-emitting surface and the second side surface SS2 increases.

[0106] To put it another way, the light-emitting element T-LE3 faces away from the adjacent fourth light-emitting element LE4 in the first direction X. Also, the light-emitting element T-LE4 faces away from the adjacent third light-emitting element LE3 in the first direction X.

[0107] As described above, the light-emitting element LE located at the left end of the row in the first light-emitting unit LP1 is the first light-emitting element LE1. That is, the first light-emitting element LE1 (light-emitting element T-LE1) emits illumination light tilted to the right from the left end of the display device DSP toward the display area DA. Also, the light-emitting element LE located at the right end of the row in the first light-emitting unit LP1 is the second light-emitting element LE2. That is, the second light-emitting element LE2 (light-emitting element T-LE2) emits illumination light tilted to the left from the right end of the display device DSP toward the display area DA.

[0108] In the example shown in Figure 16, the first normal N1 is parallel to the third normal N3. Also, the second normal N2 is parallel to the fourth normal N4.

[0109] Figure 17 is a diagram showing only the light-emitting element LE of the display device DSP shown in Figure 15. Referring to Figure 17, an example of the arrangement of light-emitting elements LE in the first light-emitting section LP1 and the second light-emitting section LP2 will be explained in more detail.

[0110] As shown in Figure 17, one of the first light-emitting elements LE1 faces one of the multiple third light-emitting elements LE3 in the second direction Y. Also, one of the second light-emitting elements LE2 faces one of the fourth light-emitting elements LE4 in the second direction Y.

[0111] Figure 18 is a schematic diagram showing how light-emitting elements T-LE1, T-LE2, T-LE3, and T-LE4 illuminate the display panel PA in a display device DSP according to the third embodiment. In Figure 18, the display panel PA is shown with some of its components omitted. In Figure 18, the illumination area IA, which is illuminated by the illumination light emitted from light-emitting elements T-LE1, T-LE2, T-LE3, and T-LE4, is represented by a dotted line.

[0112] The display device DSP according to the third embodiment includes a second light-emitting unit LP2. In this case, the display panel PA is illuminated with illumination light from both the top and bottom. Therefore, the non-uniformity of brightness in the vertical direction (second direction Y) of the display device DSP is mitigated.

[0113] The display device DSP according to the third embodiment includes a first light-emitting unit LP1 and a second light-emitting unit LP2, in which light-emitting elements LE (first light-emitting element LE1 or fourth light-emitting element LE4) tilted to the right and light-emitting elements LE (second light-emitting element LE2 or third light-emitting element LE3) tilted to the left are arranged alternately to form a row.

[0114] In the example shown in Figure 18, the light-emitting element LE (light-emitting element T-LE3) at the left end of the second light-emitting unit LP2 emits illumination light that is tilted to the left toward the display area DA. This improves the brightness at the left end of the display device DSP. Also in the example shown in Figure 18, the light-emitting element LE (light-emitting element T-LE4) at the right end of the second light-emitting unit LP2 emits illumination light that is tilted to the right toward the display area DA. This improves the brightness at the right end of the display device DSP.

[0115] The display device DSP according to the third embodiment can achieve the same effects as the first embodiment. Furthermore, the display device DSP according to the third embodiment can improve the brightness uniformity of the displayed image in the vertical direction. Moreover, the display device DSP according to the third embodiment can improve the brightness uniformity of the displayed image in the horizontal direction.

[0116] [Fourth Embodiment] Figure 19 is a plan view of the display device DSP according to the fourth embodiment.

[0117] The display device DSP according to the fourth embodiment includes a first light-emitting unit LP1 and a display panel PA, similar to the first embodiment. In Figure 19, some of the components of the display panel PA are omitted. The display device DSP according to the fourth embodiment further includes a second light-emitting unit LP2 located on the opposite side of the display panel PA from the first light-emitting unit LP1. The second light-emitting unit LP2 includes a circuit board CI, a third light-emitting element LE3, and a fourth light-emitting element LE4, similar to the third embodiment.

[0118] The display device DSP according to the fourth embodiment differs from the display device DSP according to the third embodiment in that the light-emitting element LE located at the left end of the row in the second light-emitting unit LP2 is one of a plurality of fourth light-emitting elements LE4. That is, the fourth light-emitting element LE4 (light-emitting element T-LE4) emits illumination light tilted to the right from the left end of the display device DSP toward the display area DA.

[0119] Furthermore, the display device DSP according to the fourth embodiment differs from the display device DSP according to the third embodiment in that the light-emitting element LE located at the right end of the row in the second light-emitting section LP2 is one of a plurality of third light-emitting elements LE3. That is, the third light-emitting element LE3 (light-emitting element T-LE3) emits illumination light tilted to the left from the right end of the display device DSP toward the display area DA.

[0120] In other words, as the light-emitting element T-LE4 moves in the positive direction of the first direction X, the distance between the light-emitting surface and the second side surface SS2 increases. Conversely, as the light-emitting element T-LE3 moves in the positive direction of the first direction, the distance between the light-emitting surface and the second side surface SS2 decreases.

[0121] To put it another way, the light-emitting element T-LE4 faces the adjacent third light-emitting element LE3 in the first direction X. Also, the light-emitting element T-LE3 faces the adjacent fourth light-emitting element LE4 in the first direction X.

[0122] Figure 20 is a diagram showing only the light-emitting element LE of the display device DSP shown in Figure 19. Referring to Figure 20, an example of the arrangement of light-emitting elements LE in the first light-emitting section LP1 and the second light-emitting section LP2 will be explained in more detail.

[0123] As shown in Figure 20, one of the first light-emitting elements LE1 faces one of the multiple fourth light-emitting elements LE4 in the second direction Y. Also, one of the second light-emitting elements LE2 faces one of the third light-emitting elements LE3 in the second direction Y.

[0124] Figure 21 is a schematic diagram showing how light-emitting elements T-LE1, T-LE2, T-LE3, and T-LE4 illuminate the display panel PA in a display device DSP according to the third embodiment. In Figure 21, the display panel PA is shown with some of its components omitted. In Figure 21, the illumination area IA, which is illuminated by the illumination light emitted from light-emitting elements T-LE1, T-LE2, T-LE3, and T-LE4, is represented by a dotted line.

[0125] In the example shown in Figure 21, the leftmost light-emitting element LE (light-emitting element T-LE4) of the second light-emitting unit LP2 emits illumination light that is tilted to the right toward the display area DA. That is, most of the illumination area IA of the light-emitting element T-LE4 is included in the display area DA of the display panel PA. Note that if the light-emitting element LE located at the left end of the row is the third light-emitting element LE3 instead of the fourth light-emitting element LE4 (third embodiment), a portion of the illumination area IA of the leftmost light-emitting element LE is not included in the display area DA (see Figure 18). Therefore, compared to such a case, the brightness is improved in the display device DSP according to the fourth embodiment.

[0126] Furthermore, in the example shown in Figure 21, the light-emitting element LE (light-emitting element T-LE3) at the right end of the second light-emitting unit LP2 emits illumination light tilted to the left toward the display area DA. That is, most of the illumination area IA of the light-emitting element T-LE3 is included in the display area DA of the display panel PA. Note that if the light-emitting element LE located at the right end of the row is the fourth light-emitting element LE4 instead of the third light-emitting element LE3 (third embodiment), a portion of the illumination area IA of the rightmost light-emitting element LE is not included in the display area DA (see Figure 18). Therefore, compared to such a case, the brightness is improved in the display device DSP according to the fourth embodiment.

[0127] As described above, the display device DSP according to the fourth embodiment can efficiently illuminate the display area DA. That is, since most of the illumination light emitted from the light-emitting elements LE located at the right and left ends of the display device DSP reaches the display area DA, the overall brightness of the displayed image is increased.

[0128] The third and fourth embodiments can be appropriately selected according to the specifications and applications of the display device DSP.

[0129] All display devices that a person skilled in the art can implement by appropriately modifying the design based on the display devices described above as embodiments of the present invention also fall within the scope of the present invention insofar as they encompass the gist of the present invention.

[0130] Within the scope of the concept of this invention, a person skilled in the art can conceive of various modifications, and such modifications are also understood to fall within the scope of this invention. For example, any modifications made by a person skilled in the art to add, delete, or change the design of any of the above-described embodiments, or to add, omit, or change the conditions of any process, are also included within the scope of this invention, as long as they retain the essence of this invention.

[0131] Furthermore, any other effects and advantages brought about by the embodiments described above that are obvious from the description herein or that can be appropriately conceived by those skilled in the art are naturally considered to be brought about by the present invention. [Explanation of Symbols]

[0132] X...First direction, Y...Second direction, Z...Third direction, DSP...Display device, PA...Display panel, LP1...First light-emitting part, LP2...Second light-emitting part, LG...Light guide, SLG...Auxiliary light guide, 110...First transparent substrate, 120...Second transparent substrate, 130...Third transparent substrate, 140...Fourth transparent substrate, PX...Pixel, DA...Display area, IA...Illumination area, CI...Circuit board, CP...IC chip, LE...Light-emitting element, LE1...First light-emitting element, LE2...Second light-emitting element, LE3...Third light-emitting element, LE4...Fourth light-emitting element, AN...Anode, CA...Cathode, MT...Mounting terminal, PT...Positive terminal, NT...Negative Electrode terminal, LC...Liquid crystal layer, LM...Liquid crystal molecule, PL...Polymer, SW...Switching element, PE...Pixel electrode, CE...Common electrode, G...Scan line, S...Signal line, CS...Capacitance, AL1...First alignment layer, AL2...Second alignment layer, AD1...First adhesive layer, AD2...Second adhesive layer, SS1...First side surface, SS2...Second side surface, EM1...First light-emitting surface, EM2...Second light-emitting surface, EM3...Third light-emitting surface, EM4...Fourth light-emitting surface, MS...Mounting surface, N1...First normal, N2...Second normal, N3...Third normal, N4...Fourth normal, First light-receiving surface...EN1, Second light-receiving surface...EN2, BS1...First bevel, BS2...Second bevel

Claims

1. A display panel that displays images, The system includes a first light-emitting unit that illuminates the display panel with light, The aforementioned display panel is First transparent substrate and A second transparent substrate superimposed on the first transparent substrate, A liquid crystal layer containing polymer-dispersed liquid crystal is located between the first transparent substrate and the second transparent substrate, A first wiring is located between the first transparent substrate and the liquid crystal layer and extends in a first direction, The first transparent substrate and the liquid crystal layer are located between the first transparent substrate and the liquid crystal layer, and the second wiring intersects with the first wiring, The second transparent substrate has a first side surface, The edge of the first side extends along the first direction in a plan view. The first light-emitting unit is, A plurality of first light-emitting elements having a first light-emitting surface that emits light, It has a plurality of second light-emitting elements, each having a second light-emitting surface that emits light, The plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged alternately along the first side surface. The first normal of the first light-emitting surface extends in a direction different from the first direction and the second direction perpendicular to the first direction. A display device wherein the second normal of the second light-emitting surface extends in a direction different from the first direction, the second direction, and the direction in which the first normal extends.

2. The first normal is inclined at a first angle clockwise in a plan view, with respect to the second direction. The second normal is inclined at a second angle counterclockwise in a plan view, with respect to the second direction. Each of the first and second angles is greater than 0 degrees and less than or equal to 45 degrees. The display device according to claim 1.

3. The first angle is equal to the second angle. The display device according to claim 2.

4. The device further comprises a light guide positioned between the first side surface and the first light-emitting portion. The display device according to claim 1.

5. The light guide has a first light-receiving surface parallel to the first light-emitting surface and a second light-receiving surface parallel to the second light-emitting surface. The display device according to claim 4.

6. The first light-emitting unit further comprises a circuit board having a mounting surface on which the plurality of first light-emitting elements and the plurality of second light-emitting elements are mounted, The aforementioned mounting surface is perpendicular to the first light-emitting surface and the second light-emitting surface, Mounting terminals for mounting the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a staggered pattern on the mounting surface. The display device according to claim 1.

7. The first light-emitting unit further comprises a circuit board having a mounting surface on which the plurality of first light-emitting elements and the plurality of second light-emitting elements are mounted, The aforementioned mounting surface is The first inclined surface on which the first light-emitting element is mounted, The device comprises a second inclined surface on which the second light-emitting element is mounted, The first inclined plane is parallel to the first light-emitting surface, The second inclined plane is parallel to the second light-emitting surface. The display device according to claim 1.

8. The device further includes a seal that seals the liquid crystal layer between the first transparent substrate and the second transparent substrate. The display device according to claim 1.

9. A third transparent substrate located between the first transparent substrate and the second transparent substrate, The system further comprises a seal that seals the liquid crystal layer between the first transparent substrate and the third transparent substrate, The third transparent substrate is bonded to the second transparent substrate. The display device according to claim 1.

10. The display panel is further provided with a second light-emitting section located on the opposite side of the first light-emitting section, The second transparent substrate has a second side surface located opposite to the first side surface, The second light-emitting section is, A plurality of third light-emitting elements having a third light-emitting surface that emits light, It has a plurality of fourth light-emitting elements, each having a fourth light-emitting surface that emits light, The plurality of third light-emitting elements and the plurality of fourth light-emitting elements are arranged alternately along the second side surface. The third normal of the third light-emitting surface extends in a direction different from the first and second directions. The fourth normal of the fourth light-emitting surface extends in a direction different from the directions in which the first, second, and third normals extend. The display device according to any one of claims 1 to 9.

11. The third normal is inclined at a third angle clockwise in a plan view, with respect to the second direction. The fourth normal is inclined at a fourth angle counterclockwise in a plan view, with respect to the second direction. Each of the third and fourth angles is greater than 0 degrees and less than or equal to 45 degrees. The display device according to claim 10.

12. The aforementioned third angle is equal to the aforementioned fourth angle. The display device according to claim 11.

13. The first normal is parallel to the third normal, The second normal is parallel to the fourth normal. The display device according to claim 11.

14. One of the plurality of first light-emitting elements faces one of the plurality of third light-emitting elements in the second direction. One of the plurality of second light-emitting elements faces one of the plurality of fourth light-emitting elements in the second direction. The display device according to claim 13.

15. One of the plurality of first light-emitting elements faces one of the plurality of fourth light-emitting elements in the second direction. One of the plurality of second light-emitting elements faces one of the plurality of third light-emitting elements in the second direction. The display device according to claim 13.

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