Display device and illumination device

Abstract

To provide a display device and a lighting device capable of suppressing deterioration of display quality and being easily manufactured.SOLUTION: A display device according to an embodiment includes a light guide plate, a first transparent substrate, a second transparent substrate, a plurality of light emitting elements arranged in a first direction, a liquid crystal layer including stripe-shaped polymers and liquid crystal molecules, and a transparent layer, wherein the transparent layer includes a plurality of belt portions arranged in the first direction, extending in a second direction orthogonal to the first direction, and having a refractive index lower than that of the second transparent substrate, each of the plurality of strip portions includes a first end portion located on a side facing the light emitting element and a linear second end portion on a side opposite to the first end portion, each of the plurality of strip portions includes a first portion surrounded by the first end portion, and a first edge and a second edge facing each other, and the first edge and the second edge extend in directions different from each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD OF THE INVENTION The present invention relates to a display device and a lighting device. [Background technology]

[0002] Various display devices using polymer-dispersed liquid crystals have been proposed that can switch between a scattering state that scatters incident light and a transparent state that transmits incident light. Display devices using polymer-dispersed liquid crystals sometimes use an edge-light system in which a light-emitting module is located at the edge of the display panel. Because such display devices have high transmittance, they are expected to be used in a variety of fields. However, there is a demand for improvements to be made to the phenomenon in which brightness decreases with increasing distance from the light-emitting module. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-180535 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present embodiment is to provide a display device and a lighting device that can suppress degradation of display quality and that can be easily manufactured. [Means for solving the problem]

[0005] According to one embodiment, a display device comprises a light guide plate, a first transparent substrate, a second transparent substrate arranged between the first transparent substrate and the light guide plate, a plurality of light-emitting elements arranged in a first direction, a liquid crystal layer arranged between the first transparent substrate and the second transparent substrate and containing striated polymer and liquid crystal molecules, and a transparent layer arranged between the first transparent substrate and the light guide plate, wherein the transparent layer comprises a plurality of band portions arranged in the first direction, extending in a second direction perpendicular to the first direction, and having a refractive index lower than that of the second transparent substrate, each of the plurality of band portions comprising a first end portion located on the side facing the light-emitting elements and a linear second end portion opposite the first end portion, and each of the plurality of band portions comprising a first portion surrounded by the first end portion and a first edge and a second edge facing each other, the first edge and the second edge extending in different directions from each other.

[0006] According to one embodiment, an illumination device comprises a light guide plate, a plurality of light-emitting elements arranged in a first direction, and a transparent layer, the transparent layer comprising a plurality of band portions arranged in the first direction, extending in a second direction perpendicular to the first direction, and having a refractive index lower than that of the light guide plate, each of the plurality of band portions comprising a first end portion located on the side facing the light-emitting elements and a linear second end portion opposite the first end portion, each of the plurality of band portions comprising a first portion surrounded by the first end portion and a first edge and a second edge facing each other, the first edge and the second edge extending in different directions from each other. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a plan view showing an example of the configuration of a display device according to this embodiment. [Figure 2] FIG. 2 is an exploded perspective view showing a main part of the display device shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view showing an example of the configuration of the display device shown in FIG. [Figure 4] FIG. 4 is a plan view showing an example of the configuration of the light guide element shown in FIG. [Figure 5]FIG. 5 is a cross-sectional view showing an example of the configuration of the display device of this embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing another example of the configuration of the display device shown in FIG. [Figure 7] FIG. 7 is a plan view showing another example of the configuration of the light guide element shown in FIG. [Figure 8] FIG. 8 is a plan view showing another example of the configuration of the light guide element shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present embodiment will be described below with reference to the drawings. The disclosure is merely an example, and appropriate modifications that a person skilled in the art can easily make while maintaining the gist of the invention are naturally included within the scope of the present invention. Furthermore, the drawings may be schematic in terms of the width, thickness, shape, etc. of each part compared to the actual embodiment for clarity of explanation, but these are merely examples and are not intended to limit the interpretation of the present invention. Furthermore, in this specification and each drawing, components that perform the same or similar functions as those described above with reference to the previous drawings are designated by the same reference numerals, and redundant detailed descriptions may be omitted as appropriate.

[0009] FIG. 1 is a plan view showing an example of the configuration of the display device DSP of this embodiment. In one example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, but they may intersect at an angle other than 90 degrees. The first direction X and the second direction Y correspond to directions parallel to the main surfaces of the substrates constituting the display device DSP, and the third direction Z corresponds to the thickness direction of the display device DSP. In this specification, the direction from the first substrate SUB1 to the second substrate SUB2 is referred to as the "upper side" (or simply "up"), and the direction from the second substrate SUB2 to the first substrate SUB1 is referred to as the "lower side" (or simply "lower"). When referring to a "second member above the first member" and a "second member below the first member," the second member may be in contact with the first member or may be spaced apart from the first member. Furthermore, the tip of the arrow indicating the third direction Z is assumed to be an observation position for observing the display device DSP, and viewing from this observation position toward the XY plane defined by the first direction X and the second direction Y is referred to as planar view.

[0010] In this embodiment, a liquid crystal display device using a polymer dispersed liquid crystal is disclosed as an example of the display device DSP. As shown in Fig. 1, the display device DSP includes a display panel PNL, an IC chip 1, and a wiring substrate 2.

[0011] The display panel PNL includes a first substrate SUB1, a second substrate SUB2, a liquid crystal layer LC, and a seal SE. The first substrate SUB1 and the second substrate SUB2 are formed in the shape of flat plates parallel to the XY plane. The first substrate SUB1 and the second substrate SUB2 overlap each other in a planar view. The first substrate SUB1 and the second substrate SUB2 are bonded together with the seal SE.

[0012] The first substrate SUB1 has edge portions E11 and E12 extending along the first direction X. The second substrate SUB2 has edge portions E21 and E22 extending along the first direction X. The edge portion E11 does not overlap the edge portion E21. The edge portion E12 overlaps the edge portion E22. The edge portion E21 is located between the edge portions E11 and E12 in the second direction Y. The first substrate SUB1 has an extending portion Ex extending from the edge portion E21 in the second direction Y. In the example shown in FIG. 1, the extending portion Ex corresponds to the region of the first substrate SUB1 that does not overlap with the second substrate SUB2.

[0013] The liquid crystal layer LC is disposed between the first substrate SUB1 and the second substrate SUB2, and is sealed with a seal SE. In Fig. 1, the liquid crystal layer LC is indicated by dots, and the seal SE is indicated by diagonal lines.

[0014] As schematically shown in an enlarged view in FIG. 1, the liquid crystal layer LC includes a polymer-dispersed liquid crystal including a polymer 31 and liquid crystal molecules 32. In one example, the polymer 31 is a liquid crystal polymer. The polymer 31 is formed in stripes extending along a first direction X. The liquid crystal molecules 32 are dispersed in gaps between the polymer 31 and are oriented with their major axes aligned along the first direction X. Each of the polymer 31 and the liquid crystal molecules 32 has optical anisotropy or refractive index anisotropy. The responsiveness of the polymer 31 to an electric field is lower than that of the liquid crystal molecules 32 to an electric field.

[0015] In one example, the alignment direction of the polymer 31 hardly changes regardless of the presence or absence of an electric field. On the other hand, the alignment direction of the liquid crystal molecules 32 changes in response to an electric field when a high voltage equal to or greater than a threshold value 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 31 and the liquid crystal molecules 32 are parallel to each other, and light incident on the liquid crystal layer LC is transmitted through the liquid crystal layer LC with almost no scattering within the liquid crystal layer LC (transparent state). When a voltage is applied to the liquid crystal layer LC, the optical axes of the polymer 31 and the liquid crystal molecules 32 intersect with each other, and light incident on the liquid crystal layer LC is scattered within the liquid crystal layer LC (scattered state).

[0016] The display panel PNL includes a display section DA that displays an image in an area where the first substrate SUB1 and the second substrate SUB2 overlap in a plan view, and a non-display section NDA that surrounds the display section DA. The seal SE is located in the non-display section NDA. The display section DA includes pixels PX arranged in a matrix in the first direction X and the second direction Y. The display section DA has edges E41 and E42 that extend along the first direction X. The edge E41 is located between the edge E21 and the edge E42. The edge E42 is located between the edge E12 and the edge E41.

[0017] As shown enlarged in FIG. 1, each pixel PX includes a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, etc. The switching element SW is formed, for example, by a thin film transistor (TFT) and is electrically connected to a scanning line G and a signal line S. The scanning line G extends in a 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 a second direction Y and is electrically connected to the switching element SW in each of the pixels PX aligned in 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, liquid crystal molecules 32) by an electric field generated between the pixel electrode PE and the common electrode CE. The capacitance CS is formed, for example, between an electrode having the same potential as the common electrode CE and an electrode having the same potential as the pixel electrode PE.

[0018] The IC chip 1 and the wiring board 2 are each connected to the extension portion Ex. The IC chip 1 has built-in, for example, a display driver that outputs signals necessary for image display. The wiring board 2 is a bendable flexible printed circuit board. The IC chip 1 may be connected to the wiring board 2. The IC chip 1 and the wiring board 2 may read signals from the display panel PNL, but they mainly function as signal sources that supply signals to the display panel PNL.

[0019] 1, the display device DSP includes a reflective member RM disposed on the side surface along the edges E12 and E22. The reflective member RM is formed of a metal material with high reflectivity, such as aluminum, silver, or titanium. The reflective member RM may be a sheet adhered to the side surface, or may be a thin film formed directly on the side surface by a method such as vapor deposition.

[0020] FIG. 2 is an exploded perspective view showing the main part of the display device DSP shown in FIG. The display device DSP includes a light guide element LG and a light emitting module LM in addition to the display panel PNL. The first substrate SUB1, the second substrate SUB2, and the light guide element LG are arranged in this order along the third direction Z.

[0021] The light guide element LG includes a transparent substrate 30, a transparent layer 40, and a protective layer 70. The transparent substrate 30 has an edge portion E31 and an edge portion E32 extending along the first direction X. The edge portion E31 overlaps the edge portion E21 in a planar view. The edge portion E32 overlaps the edges E12 and E22 in a planar view. The transparent substrate 30 further has a side surface 31C along the edge portion E31. The side surface 31C is a plane substantially parallel to the XZ plane defined by the first direction X and the third direction Z. The side surface 31C is located on the side facing the light emitting element LD in a planar view. The side surface 31C faces the plurality of light emitting elements LD in the second direction Y.

[0022] The light-emitting module LM includes a plurality of light-emitting elements LD, a light guide LB, and a wiring board F. The plurality of light-emitting elements LD are arranged at intervals in the first direction X. Each of the plurality of light-emitting elements LD is connected to the wiring board F. In the example shown in FIG. 2, each of the plurality of light-emitting elements LD overlaps the extension portion Ex in a planar view. The light-emitting element LD is, for example, a light-emitting diode. Although not described in detail, the light-emitting element LD includes a red light-emitting portion, a green light-emitting portion, and a blue light-emitting portion. Light emitted from the light-emitting element LD travels along the direction of the arrow indicating the second direction Y. The light guide LB is formed in a rod shape extending in the first direction X, and is disposed between the light-emitting element LD and the light guide element LG in the second direction Y.

[0023] Fig. 3 is a cross-sectional view showing an example of the configuration of the display device DSP shown in Fig. 1. Here, a cross section of the display unit DA in the XZ plane defined by the first direction X and the third direction Z will be described.

[0024] The first substrate SUB1 includes a transparent substrate 10, insulating layers 11 and 12, a capacitance electrode 13, a switching element SW, a pixel electrode PE, and an alignment film AL1. The first substrate SUB1 further includes the scanning lines G and signal lines S shown in FIG. 1. The scanning lines G are disposed, for example, between the transparent substrate 10 and the insulating layer 11.

[0025] The transparent substrate 10 has a main surface (lower surface) 10A and a main surface (upper surface) 10B opposite to the main surface 10A. The main surfaces 10A and 10B are surfaces that are approximately parallel to the XY plane. The switching element SW is disposed on the main surface 10B, for example. The insulating layer 11 covers the switching element SW and the main surface 10B. The capacitance electrode 13 is disposed between the insulating layers 11 and 12.

[0026] The pixel electrode PE is disposed for each pixel PX between the insulating layer 12 and the alignment film AL1. The pixel electrode PE is electrically connected to the switching element SW through an opening OP in the capacitance electrode 13. The pixel electrode PE overlaps with the capacitance electrode 13 with the insulating layer 12 sandwiched therebetween, forming a capacitance CS for the pixel PX. The alignment film AL1 covers the pixel electrode PE and the insulating layer 12.

[0027] The second substrate SUB2 includes a transparent substrate 20, a light-shielding layer BM, a common electrode CE, and an alignment film AL2.

[0028] The transparent substrate 20 has a main surface (lower surface) 20A and a main surface (upper surface) 20B opposite to the main surface 20A. The main surfaces 20A and 20B are surfaces that are approximately parallel to the XY plane. The main surface 20A of the transparent substrate 20 faces the main surface 10B of the transparent substrate 10.

[0029] The light-shielding layer BM and the common electrode CE are disposed on the main surface 20A. The light-shielding layer BM is located, for example, directly above the switching element SW and overlaps the light-shielding layer BM in a planar view. The light-shielding layer BM may be located directly above the signal line S and the scanning line G (not shown). The common electrode CE is disposed across the plurality of pixels PX, faces each of the pixel electrodes PE in the third direction Z via the liquid crystal layer LC, and directly covers the light-shielding layer BM. The common electrode CE is electrically connected to the capacitance electrode 13 and has the same potential as the capacitance electrode 13.

[0030] The alignment film AL2 covers the common electrode CE. The liquid crystal layer LC is located between the main surface 10B and the main surface 20A, and is in contact with the alignment films AL1 and AL2.

[0031] The light guide element LG includes a transparent substrate 30, a transparent layer 40, and a protective layer 70. The transparent substrate 30 includes a main surface (lower surface) 30A and a main surface (upper surface) 30B opposite the main surface 30A. The main surfaces 30A and 30B are surfaces that are approximately parallel to the XY plane. The main surface 30A faces the main surface 20B of the transparent substrate 20.

[0032] The transparent layer 40 is disposed between the principal surface 30A and the principal surface 20B. In the example shown in FIG. 3, the transparent layer 40 is disposed on the principal surface 30A. The transparent layer 40 includes a plurality of band portions 50 and a frame portion 60 (not shown). The band portions 50 are arranged side by side at intervals in the first direction X and extend along the second direction Y. The principal surface 30A is exposed between adjacent band portions 50. The band portions 50 are located, for example, directly above the switching elements SW and overlap the switching elements SW in a planar view. The band portions 50 may be located directly above the signal lines S (not shown) and overlap the signal lines S in a planar view. The detailed shape of the transparent layer 40 will be described later. The protective layer 70 is disposed between the principal surface 30A and the principal surface 20B and directly covers the transparent layer 40.

[0033] In the first substrate SUB1, the switching element SW, insulating layers 11 and 12, capacitive electrode 13, pixel electrode PE, and alignment film AL1 are located between the main surface 10B and the liquid crystal layer LC. In the second substrate SUB2, the light-shielding layer BM, common electrode CE, and alignment film AL2 are located between the main surface 20A and the liquid crystal layer LC. In the light guide element LG, the transparent layer 40 and the protective layer 70 are located between the main surface 30A and the main surface 20B.

[0034] The transparent substrates 10 and 20 are insulating substrates such as glass substrates or plastic substrates. The transparent substrate 30 is an insulating substrate such as a glass substrate or a plastic substrate made of polymethyl methacrylate (PMMA), polycarbonate (PC), etc. The insulating layers 11 and 12 are inorganic insulating films such as silicon oxide, silicon nitride, and silicon oxynitride, or organic insulating films such as acrylic resin.

[0035] The capacitance electrode 13, pixel electrode PE, and common electrode CE are transparent electrodes made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The light-shielding layer BM may be a light-absorbing layer made of a light-absorbing material, or a light-reflecting layer made of a light-reflective material. The light-shielding layer BM may also be an insulating layer made of an inorganic or organic material, or a conductive layer made of a metal material.

[0036] The alignment films AL1 and AL2 are horizontal alignment films having an alignment restriction force substantially parallel to the XY plane. In one example, the alignment films AL1 and AL2 are subjected to an alignment treatment along the first direction X. The alignment treatment may be a rubbing treatment or a photo-alignment treatment.

[0037] The transparent layer 40 is an insulating layer made of an organic material such as a siloxane-based resin or a fluorine-based resin, etc. The protective layer 70 is an insulating film made of an organic material or an inorganic material, for example.

[0038] The transparent substrate 10 has a thickness T1, the transparent substrate 20 has a thickness T2, and the transparent substrate 30 has a thickness T3. In this specification, the thickness corresponds to the length along the third direction Z. In the illustrated example, the thickness T1 is equal to the thickness T2, and the thickness T3 is thicker than the thicknesses T1 and T2. The thickness T3 may be equal to the thicknesses T1 and T2.

[0039] The transparent substrates 10, 20, 30 and the protective layer 70 have refractive indices n10, n20, n30, and n70, respectively. The transparent layer 40 has a refractive index n40 that is smaller than the refractive indices n10, n20, n30, and n70. For example, the refractive indices n10, n20, n30, and n70 are approximately 1.5, and the refractive index n40 is 1.0 or greater and 1.50 or less. The refractive indices n10, n20, n30, and n70 are equivalent. Here, "equivalent" does not necessarily mean that the difference in refractive index is zero, but also includes a difference in refractive index of 0.03 or less.

[0040] Fig. 4 is a plan view showing a configuration example of the light guide element LG shown in Fig. 2. The protective layer 70 is omitted in Fig. 4. In Fig. 4, the band portion 50 is schematically shown with an enlarged width in the first direction X. In Fig. 4, the area that overlaps with the display unit DA when the light guide element LG overlaps with the display panel PNL shown in Fig. 2 is shown by a dashed dotted line.

[0041] The transparent layer 40 includes a plurality of band portions 50 and a frame portion 60. The plurality of band portions 50 are arranged at intervals in the first direction X and extend in the second direction Y.

[0042] The band portion 50 has a first end portion 501 located on the side facing the light-emitting element LD, and a second end portion 502 on the opposite side to the first end portion 501. The first end portions 501 are arranged on the same straight line along the first direction X. In the example shown in FIG. 4, each of the first end portions 501 is located between the edge portion E31 and the edge portion E41 in a plan view (i.e., in a region overlapping with the non-display portion NDA in a plan view), but is not limited to this.

[0043] The second ends 502 are arranged on the same straight line along the first direction X. In the example shown in FIG. 4, the second ends 502 are located between the edge E41 and the edge E42 (i.e., in a region overlapping with the display unit DA in a plan view), but this is not limiting. The second ends 502 are formed in a straight line. In the example shown in FIG. 4, the second ends 502 are formed in a straight line along the first direction X.

[0044] Each of the first end 501 and the second end 502 has a first width W1 and a second width W2. In this specification, the term "width" refers to the length along the first direction X. The first width W1 is larger than the second width W2. In one example, the first width W1 is smaller than the width WL of one light-emitting element LD, and one light-emitting element LD is arranged across multiple strip portions 50 aligned in the first direction X. The first width W1 is equal to or smaller than the width WP of one pixel electrode PE (or the pitch of the pixel electrodes PE aligned in the first direction X). The first width W1 is approximately the same for all strip portions 50. The second width W2 is approximately the same for all strip portions 50.

[0045] The band portion 50 further includes a first edge 503, a second edge 504, a third edge 505, and a fourth edge 506. The first edge 503 and the second edge 504 face each other. The third edge 505 and the fourth edge 506 face each other. The first edge 503 and the second edge 504 are disposed between the light-emitting element LD and the third edge 505 and the fourth edge 506.

[0046] The first edge 503 and the second edge 504 are each connected to the first end 501, and the third edge 505 and the fourth edge 506 are each connected to the second end 502. Furthermore, the first edge 503 is connected to the third edge 505, and the second edge 504 is connected to the fourth edge 506.

[0047] The strip portion 50 includes a first portion 50a surrounded by a first end portion 501, a first edge 503, and a second edge 504. The strip portion 50 also includes a second portion 50b surrounded by a second end portion 502, a third edge 505, and a fourth edge 506. The first portion 50a is disposed between the second portion 50b and the light-emitting element LD. The first portion 50a is connected to the second portion 50b.

[0048] The first edge 503 and the second edge 504 extend in different directions and are non-parallel to each other between the first end 501 and the second portion 50b. The first edge 503 and the second edge 504 each extend in a direction different from, for example, the first direction X and the second direction Y. For example, a direction intersecting the second direction Y at an acute angle clockwise is defined as direction D1, and a direction intersecting the second direction Y at an acute angle counterclockwise is defined as direction D2. In the example shown in FIG. 4 , the angle θ1 between the second direction Y and the direction D1 and the angle θ2 between the second direction Y and the direction D2 are the same. However, this is not limiting, and the angle θ1 between the second direction Y and the direction D1 and the angle θ2 between the second direction Y and the direction D2 may be different. For example, the first edge 503 extends along the direction D1, and the second edge 504 extends along the direction D2. In the example shown in FIG. 4, the first edge 503 and the second edge 504 both extend linearly, but may be formed in a curved shape.

[0049] The third edge 505 and the fourth edge 506 extend in the same direction and are parallel to each other between the first portion 50a and the second end 502. In the example shown in Fig. 4, each of the third edge 505 and the fourth edge 506 extends in the second direction Y.

[0050] The first width W1 corresponds to the distance between the first edge 503 and the second edge 504 in the first direction X, and the second width W2 corresponds to the distance between the third edge 505 and the fourth edge 506 in the first direction X.

[0051] From another perspective, the first portion 50a has an approximately trapezoidal shape with the first end 501 as one base and the first edge 503 and the second edge 504 as two sides, and the second portion 50b has an approximately rectangular shape with the second end 502, the third edge 505, and the fourth edge 506 as three sides.

[0052] In the band portion 50 having such a shape, the first portion 50a has a width that gradually decreases at a constant rate or at an arbitrary rate as it moves away from the first end portion 501 in the second direction Y. That is, the distance in the first direction X between the first edge 503 and the second edge 504 decreases as it moves away from the light-emitting element LD in the second direction Y. On the other hand, the second portion 50b has a substantially constant width along the second direction Y. That is, the distance in the first direction X between the third edge 505 and the fourth edge 506 is substantially constant along the second direction Y. The multiple band portions 50 have the same width along the first direction X at positions equidistant from the edge E31 along the second direction Y.

[0053] 4, the length L1 of the first portion 50a in the second direction Y is greater than the length L2 of the second portion 50b in the second direction, but this is not limited to this. When the distance in the second direction Y from the edge E31 to the edge E32 is L, the first portion 50a extends, for example, to about 1 / 2 to 3 / 4 of the distance L.

[0054] The pitch between adjacent strip portions 50 is preferably equal to or less than twice the width WP of the pixel electrode PE (or the pitch between the pixel electrodes PE aligned in the first direction X). In the example shown in Fig. 4, one pixel electrode PE overlaps two adjacent strip portions 50 in a plan view. The pixel electrode PE overlaps the main surface 30A of the transparent substrate 30 between the adjacent strip portions 50.

[0055] If the pitch between adjacent strip portions 50 and the pitch between adjacent signal lines S are the same, moire may occur, so it is desirable that the pitch between adjacent strip portions 50 be different from the pitch between adjacent signal lines S. In FIG. 4, the signal lines S that overlap with the transparent substrate 30 when the light guide element LG and the display panel PNL shown in FIG. 2 are overlapped are indicated by dashed dotted lines. The multiple signal lines S are arranged side by side at intervals in the first direction X and extend in the second direction Y. As shown in the figure, the pitch between adjacent strip portions 50 is, for example, smaller than the pitch between adjacent signal lines S.

[0056] The frame portion 60 has a frame shape that surrounds the multiple band portions 50. The frame portion 60 has a first portion 60a and a second portion 60b that extend along a first direction X, and a third portion 60c and a fourth portion 60d that extend along a second direction Y. The first portion 60a and the second portion 60b face each other in the second direction Y. The third portion 60c and the fourth portion 60d face each other in the first direction X.

[0057] For example, the first portion 60a is located between the edge E31 and the edge E41, and the second portion 60b is located between the edge E32 and the edge E42. In the example shown in Fig. 4, each of the first ends 501 of the multiple band portions 50 is connected to the first portion 60a, and each of the second ends 502 of the multiple band portions 50 is spaced apart from the second portion 60b in the second direction Y. The multiple band portions 50 and the frame portion 60 are, for example, integrally formed from the same material.

[0058] 2, the bands 50 overlap the display area DA, and the frame 60 overlaps the non-display area NDA.

[0059] In the display unit DA, of the pixel electrodes overlapping with the first portion 50a of the band portion 50, attention is focused on the pixel electrode PE1 closest to the light-emitting element LD and the pixel electrode PE2 farthest from the light-emitting element LD. The area where the pixel electrode PE1 overlaps with the transparent layer 40 is larger than the area where the pixel electrode PE2 overlaps with the transparent layer 40. In other words, the area where the main surface 30A and the pixel electrode PE1 overlap without the transparent layer 40 is smaller than the area where the main surface 30A and the pixel electrode PE2 overlap without the transparent layer 40.

[0060] Also, in the display unit DA, attention is focused on the pixel electrode PE2 and the pixel electrode PE3 that is farthest from the light-emitting element LD. The area where the pixel electrode PE2 overlaps with the transparent layer 40 is larger than the area where the pixel electrode PE3 overlaps with the transparent layer 40. In other words, the area where the main surface 30A and the pixel electrode PE2 overlap without the transparent layer 40 is smaller than the area where the main surface 30A and the pixel electrode PE3 overlap without the transparent layer 40.

[0061] In this way, the overlapping area between the pixel electrode PE and the transparent layer 40 is larger in the region close to the light emitting element LD than in the region away from the light emitting element LD.

[0062] As will be described later, the area overlapping the transparent layer 40 corresponds to an area where almost no light from the light-emitting element LD enters the display panel PNL, and the area overlapping the main surface 30A without going through the transparent layer 40 corresponds to an area where light from the light-emitting element LD can enter the display panel PNL.

[0063] Fig. 5 is a cross-sectional view showing an example of the configuration of the display device DSP shown in Fig. 1. Note that only the main part of the display panel PNL is shown. With reference to Fig. 5, the light emitted from the light emitting element LD will be described.

[0064] The light emitting element LD emits light L1 toward the side surface 31C. The light L1 emitted from the light emitting element LD is refracted at the side surface 31C and enters the transparent substrate 30. Of the light L1 that enters the transparent substrate 30, a portion of the light that travels from the transparent substrate 30 toward the transparent layer 40 is reflected at the interface between the transparent substrate 30 and the transparent layer 40 and does not reach the second substrate SUB2, the liquid crystal layer LC, or the first substrate SUB1. Furthermore, of the light that travels from the transparent substrate 30 toward the transparent layer 40, light that has an incident angle smaller than the critical angle passes through the transparent layer 40 and reaches the liquid crystal layer LC, as indicated by the dashed line.

[0065] Furthermore, of the light L1 incident on the transparent substrate 30, the light traveling toward the main surface 30B is reflected at the interface between the transparent substrate 30 and the air layer. In this way, most of the light L1 travels inside the transparent substrate 30 while being repeatedly reflected near the side surface 31C (or the region where the transparent layer 40 is present). Of the traveling light L1, the light traveling toward the region where the transparent layer 40 is not present, i.e., the region where the transparent substrate 30 and the protective layer 70 are in contact, passes through the transparent substrate 30 and then passes through the transparent substrate 20 via the protective layer 70.

[0066] The liquid crystal layer LC of a pixel to which a voltage is applied scatters the light L1, while the liquid crystal layer LC of a pixel to which no voltage is applied transmits the light L1.

[0067] 5, when a reflecting member RM is provided on the opposite side of the light-emitting element LD, for example, light L1 that reaches the side surface opposite to side surface 31C is reflected by the reflecting member RM toward the display unit. This prevents light from leaking from the side surface opposite to side surface 31C, and improves the utilization efficiency of light L1 compared to when the reflecting member RM is not provided.

[0068] In this embodiment, the light guide element LG and the light emitting module LM can be regarded as an illumination device that illuminates the display panel PNL. That is, the display device DSP includes the display panel PNL and an illumination device that faces the display panel PNL in the third direction Z.

[0069] As described with reference to FIG. 4, the overlapping area between the pixel electrode PE and the transparent layer 40 is larger in the region close to the light-emitting element LD than in the region away from the light-emitting element LD. Therefore, in the region close to the light-emitting element LD, the incidence of light L1 on the pixel electrode PE is suppressed, while in the region away from the light-emitting element LD, the incidence of light L1 on the pixel electrode PE is promoted. Note that in the region close to the light-emitting element LD, the light L1 is not completely blocked from entering the display panel PNL. As shown in FIG. 4, the light L1 enters the display panel PNL through gaps between adjacent strip portions 50, and light with an incident angle outside the total reflection condition also enters the display panel PNL. In regions spaced the same distance from the light-emitting element LD, the overlapping area between the pixel electrode PE and the transparent layer 40 is the same. Therefore, in regions spaced the same distance from the light-emitting element LD, the light L1 is incident on each pixel electrode PE to the same extent.

[0070] Of the light incident on the liquid crystal layer LC, light traveling toward the transparent layer 40 is reflected at the interface between the transparent substrate 30 and the transparent layer 40. Light L1 incident on the liquid crystal layer LC passes through pixels in the transparent state and is scattered by pixels in the scattering state. The display device DSP can be observed from both the main surface 10A side and the main surface 30B side. The display device DSP is a so-called transparent display, and the background of the display device DSP can be observed through the display device DSP whether observed from the main surface 10A side or the main surface 30B side.

[0071] According to this embodiment, it is possible to prevent the luminance of the display panel PNL from becoming non-uniform. When focusing on the luminance distribution of the light L1 from the light emitting element LD, the luminance tends to decrease in areas farther from the light emitting element LD. One cause of this decrease in luminance is the absorption and scattering of undesired light L1 by the liquid crystal layer LC, the switching element SW, the signal line S, various insulating films, etc.

[0072] The area where the transparent layer 40 overlaps the pixel electrode PE corresponds to the area where light L1 from the light-emitting element LD is hardly incident on the display panel PNL, and the area where the transparent layer 40 does not overlap the pixel electrode PE (or the area between adjacent band portions 50) corresponds to the area where light L1 from the light-emitting element LD is incident on the display panel PNL.

[0073] In the region close to the light-emitting element LD, the overlapping area of ​​the transparent layer 40 per pixel electrode PE is larger than in the region farther from the light-emitting element LD. Therefore, in the region close to the light-emitting element LD, the incidence of light L1 on the display panel PNL is suppressed, and absorption and scattering of light L1 by the liquid crystal layer LC, switching element SW, signal line S, various insulating films, etc. is suppressed. On the other hand, in the region farther from the light-emitting element LD, the incidence of light L1 on the display panel PNL is promoted. As described above, the light from the light-emitting element LD attenuates with increasing distance from the light-emitting element LD.

[0074] 4, the overlapping area between the pixel electrode PE1 and the transparent layer 40 is larger than the overlapping area between the pixel electrode PE2 and the transparent layer 40. Therefore, the area of ​​the region where light L1 can enter the pixel electrode PE1 is smaller than the area of ​​the region where light L1 can enter the pixel electrode PE2. On the other hand, the intensity of the light entering the pixel electrode PE1 is stronger than the intensity of the light entering the pixel electrode PE2. Therefore, the luminance of the display panel PNL at the pixel electrodes PE1 and PE2 can be equalized.

[0075] 4, the overlapping area between the pixel electrode PE2 and the transparent layer 40 is larger than the overlapping area between the pixel electrode PE3 and the transparent layer 40. Therefore, the area of ​​the region where the light L1 can be incident on the pixel electrode PE2 is smaller than the area of ​​the region where the light L1 can be incident on the pixel electrode PE3. On the other hand, the intensity of the light incident on the pixel electrode PE2 is stronger than the intensity of the light incident on the pixel electrode PE3. Therefore, the luminance of the display panel PNL at the pixel electrodes PE2 and PE3 can be equalized.

[0076] In this way, according to this embodiment, it is possible to prevent the luminance of the display panel PNL from becoming non-uniform, and therefore it is possible to prevent a decrease in the display quality of the image displayed on the display panel PNL.

[0077] If the second width W2 of the second end 502 of the strip 50 is too small, it may be difficult to form the strip 50 in manufacturing the display device DSP.

[0078] In the band portion 50 shown in FIG. 4 , the second end portion 502 is formed linearly. Each of the multiple band portions 50 includes a first portion 50a surrounded by a first end portion 501 and a first edge 503 and a second edge 504 facing each other. Each of the multiple band portions 50 further includes a second portion 50b surrounded by a second end portion 502 and a third edge 505 and a fourth edge 506 facing each other and parallel to each other. The first edge 503 and the second edge 504 extend in different directions. The third edge 505 and the fourth edge 506 extend in the same direction and are parallel to each other. By forming the band portion 50 in this shape, the second width W2 of the second end portion 502 can be set to a certain value or greater while maintaining the same brightness of the display panel PNL. This prevents the band portions 50 from becoming difficult to form.

[0079] As described above, according to this embodiment, it is possible to provide a display device DSP that can suppress a decrease in the display quality of an image displayed on the display panel PNL and that can be easily manufactured.

[0080] Fig. 6 is a plan view showing another configuration example of the display device DSP shown in Fig. 3. The configuration example shown in Fig. 6 differs from the configuration example shown in Fig. 3 in that the second substrate SUB2 has a transparent layer 40, and the light guide element LG does not have the transparent layer 40.

[0081] The second substrate SUB2 includes a transparent substrate 20, a light-shielding layer BM, a common electrode CE, a transparent layer 40, a protective layer 70, and an alignment film AL2.

[0082] The light-shielding layer BM and the common electrode CE are disposed on the main surface 20 A. The common electrode CE is disposed across the plurality of pixels PX, faces each of the pixel electrodes PE in the third direction Z via the liquid crystal layer LC, and directly covers the light-shielding layer BM.

[0083] The transparent layer 40 is disposed between the main surface 20A and the alignment film AL2. In the example shown in Fig. 6, the transparent layer 40 is disposed between the common electrode CE and the protective layer 70, and is formed on the surface of the common electrode CE that faces the liquid crystal layer LC. The transparent layer 40 includes a plurality of band portions 50 and a frame portion 60 (not shown).

[0084] The protective layer 70 is disposed between the common electrode CE and the alignment film AL2, and covers the transparent layer 40. The alignment film AL2 covers the protective layer 70. The principal surface 20B and the principal surface 30A are bonded together by, for example, a transparent adhesive layer AD. In this configuration example, the same effects as those in the configuration example shown in FIG. 3 can be obtained.

[0085] Fig. 7 is a plan view showing another example of the configuration of the light guide element LG shown in Fig. 4. The protective layer 70 is omitted in Fig. 7. The band portion 50 is also shown in Fig. 7 by enlarging its width in the first direction X. In Fig. 7, the area that overlaps with the display unit DA when the light guide element LG overlaps with the display panel PNL shown in Fig. 2 is shown by a dashed dotted line.

[0086] The configuration example shown in FIG. 7 differs from the configuration example shown in FIG. 2 in that the transparent layer 40 includes a plurality of band portions 50 having different lengths in the second direction Y.

[0087] 7, when seven strip portions 50 arranged in the first direction X form a repeating unit U, in one repeating unit U, the length in the second direction Y of the strip portions 50 is longest for the strip portion 51 closest to the fourth portion 60d of the frame portion 60, and is shortest for the strip portion 54 farthest from the fourth portion 60d. Furthermore, the length in the second direction Y of the strip portions 50 gradually decreases from strip portion 51 to strip portion 54.

[0088] For example, the length L2 in the second direction Y of the second portion 50b of each band 50 is longest for band 51 and shortest for band 54, and gradually decreases from band 51 to band 54. The length L1 in the second direction Y of the first portion 50a of each band 50 is the same for all bands 50.

[0089] 7, the band portion 54 includes a first portion 50a surrounded by a first end portion 501, a first edge 503, a second edge 504, and a second end portion 502, but does not include a second portion 50b. Note that the band portion 54 may also include the second portion 50b.

[0090] 7, seven band portions 50 aligned in the first direction X are defined as one repeating unit U, but the number of band portions 50 included in one repeating unit U is not particularly limited as long as it is two or more. For example, one repeating unit U may include ten band portions 50 aligned in the first direction X.

[0091] The length L2 of the band portion 50 in the second direction Y may be smallest at band portion 51 and largest at band portion 54, and gradually increase from band portion 51 to band portion 54.

[0092] Here, attention is focused on the band portion 51, the band portion 52 adjacent to the band portion 51 in the first direction X, and the band portion 53 adjacent to the band portion 52 in the first direction X. The band portions 51, 52, and 53 are aligned in this order in the first direction X. The transparent layer 40 has a plurality of band portions 51, 52, and 53. The plurality of band portions 51 are aligned in the first direction X at a pitch P1. The plurality of band portions 52 are aligned in the first direction X at a pitch P2. The plurality of band portions 53 are aligned in the first direction X at a pitch P3. The pitches P1, P2, and P3 are approximately the same.

[0093] In the display unit DA, among the pixel electrodes overlapping the first portion 50a of the band portion 50, attention is focused on the multiple pixel electrodes PE1 closest to the light-emitting element LD and the multiple pixel electrodes PE2 farthest from the light-emitting element LD. The area where the multiple pixel electrodes PE1 overlap with the transparent layer 40 is larger than the area where the multiple pixel electrodes PE2 overlap with the transparent layer 40. In other words, the area where the multiple pixel electrodes PE1 overlap with the main surface 30A without the transparent layer 40 interposed therebetween is smaller than the area where the multiple pixel electrodes PE2 overlap with the main surface 30A without the transparent layer 40 interposed therebetween.

[0094] In the display unit DA, attention is focused on the plurality of pixel electrodes PE2 and the plurality of pixel electrodes PE3 that are farthest from the light-emitting element LD. The area where the plurality of pixel electrodes PE2 overlap with the transparent layer 40 is larger than the area where the plurality of pixel electrodes PE3 overlap with the transparent layer 40. In other words, the area where the plurality of pixel electrodes PE2 overlap with the main surface 30A without the transparent layer 40 interposed therebetween is smaller than the area where the plurality of pixel electrodes PE3 overlap with the main surface 30A without the transparent layer 40 interposed therebetween.

[0095] Also, in the display unit DA, attention is focused on the pixel electrode PE3 and the plurality of pixel electrodes PE4 located between the pixel electrodes PE2 and PE3. The area where the plurality of pixel electrodes PE4 overlap with the transparent layer 40 is larger than the area where the plurality of pixel electrodes PE3 overlap with the transparent layer 40. In other words, the area where the plurality of pixel electrodes PE4 overlap with the main surface 30A without the transparent layer 40 interposed therebetween is smaller than the area where the plurality of pixel electrodes PE3 overlap with the main surface 30A without the transparent layer 40 interposed therebetween.

[0096] In this way, in the region close to the light emitting element LD, the overlapping area between the plurality of pixel electrodes PE and the transparent layer 40 is larger than in the region away from the light emitting element LD.

[0097] In a display device DSP including a transparent layer 40 having a plurality of band portions 50, when each of the second ends 502 is arranged on the same straight line along the first direction X, the area overlapping with the transparent layer 40 in the region between the same straight line and the edge E42 is suddenly smaller than the region between the edge E41 and the same straight line. This results in a large change in luminance between the regions, which may result in a decrease in the display quality of the display device DSP.

[0098] The plurality of strip portions 50 have different lengths in the second direction Y, and the distance from the second end 502 to the edge E42 varies. This allows the area overlapping with the transparent layer 40 to gradually decrease from the region close to the edge E41 to the region away from the edge E41 and close to the edge E42, thereby preventing abrupt changes in brightness. In this way, the configuration example shown in FIG. 7 can further prevent a decrease in the display quality of the image displayed on the display panel PNL. Furthermore, this configuration example also provides the same effects as the configuration example shown in FIG. 2.

[0099] Fig. 8 is a plan view showing another example of the configuration of the light guide element LG shown in Fig. 7. The protective layer 70 is omitted in Fig. 8. The band portion 50 is also shown in Fig. 8 with an enlarged width in the first direction X. In Fig. 8, the area that overlaps with the display unit DA when the light guide element LG overlaps with the display panel PNL shown in Fig. 2 is shown by a dashed dotted line.

[0100] The configuration example shown in FIG. 8 differs from the configuration example shown in FIG. 7 in that a plurality of band portions 50 having different lengths in the second direction Y are randomly arranged in the first direction X.

[0101] Here, attention is focused on band portion 51, band portion 52 adjacent to band portion 51 in the first direction X, and band portion 53 adjacent to band portion 52 in the first direction X. The multiple band portions 51 are lined up in the first direction X at a pitch P1. The multiple band portions 52 are lined up in the first direction X at a pitch P2. The multiple band portions 53 are lined up in the first direction X at a pitch P3. The pitches P1, P2, and P3 are different from one another. In the example shown in FIG. 8, pitch P1 is larger than pitch P2, and pitch P3 is larger than pitch P2, but this is not limited to this.

[0102] In the example shown in Figure 8, the length in the second direction Y of band portion 51 is greater than the length in the second direction Y of band portions 52 and 53, and the length in the second direction Y of band portion 52 is greater than the length in the second direction Y of band portion 53, but this is not limited to this.

[0103] 7, the length of strip 50 in the second direction Y gradually decreases along the first direction X from strip 51 to strip 54, and second end 502 gradually moves away from edge E42 in the second direction Y. That is, the distance in the second direction Y over which light L1 is repeatedly reflected and travels inside transparent substrate 30 gradually decreases along the first direction X. Therefore, the intensity of light incident on pixel electrode PE3, which is farthest from light-emitting element LD, gradually decreases along the first direction X, and the luminance of pixel electrode PE3 gradually decreases along the first direction X.

[0104] The length of the strip portion 50 in the second direction Y is shortest at strip portion 54 and longest at strip portion 51 adjacent to strip portion 54 in the first direction X. In other words, the distance in the second direction Y over which light L1 is repeatedly reflected and travels inside the transparent substrate 30 is smallest in the region overlapping with strip portion 54 and rapidly increases in the region overlapping with the adjacent strip portion 51. As a result, the intensity of light incident on the pixel electrode PE3 rapidly increases, and the luminance of the pixel electrode PE3 rapidly increases.

[0105] In this way, the luminance of the pixel electrode PE3 gradually decreases along the first direction X, but suddenly increases in a specific region. For this reason, the change in luminance in the specific region may be particularly noticeable, making the change in luminance more visible.

[0106] 8, a plurality of strip portions 50 having different lengths in the second direction Y are randomly arranged in the first direction X. That is, the distance in the second direction Y over which the light L1 is repeatedly reflected and travels inside the transparent substrate 30 can be randomized along the first direction X. This makes it possible to randomize the intensity of light incident on the pixel electrode PE3, thereby preventing the occurrence of areas where changes in luminance are particularly noticeable and preventing changes in luminance from becoming easily visible.

[0107] Therefore, in the configuration example shown in Fig. 8, it is possible to further suppress the deterioration of the display quality of the image displayed on the display panel PNL. Furthermore, in such a configuration example, the same effects as those in the configuration example shown in Fig. 7 can be obtained.

[0108] The configuration examples shown in FIGS. 7 and 8 can be applied to either of the display device DSPs shown in FIGS.

[0109] As described above, according to this embodiment, it is possible to provide a display device capable of suppressing degradation in display quality.

[0110] In this embodiment, for example, transparent substrate 10 corresponds to the first transparent substrate, transparent substrate 20 corresponds to the second transparent substrate, transparent substrate 30 corresponds to the light guide plate, pixel electrode PE1 corresponds to the first pixel electrode, pixel electrode PE2 corresponds to the second pixel electrode, pixel electrode PE3 corresponds to the third pixel electrode, pixel electrode PE4 corresponds to the fourth pixel electrode, band portion 51 corresponds to the first band portion, band portion 52 corresponds to the second band portion, and band portion 53 corresponds to the third band portion.

[0111] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0112] DSP...Display device PNL...Display panel SE...Seal DA...Display area NDA...Non-display area PX...Pixel LC...liquid crystal layer 31...polymer 32...liquid crystal molecules LG: Light guide element LD: Light emitting element SW: Switching element PE: Pixel electrode CE: Common electrode G...Scanning line S...Signal line RM: Reflective material 10...Transparent substrate 20...Transparent substrate 30...Transparent substrate 40...Transparent layer 50...Obi part 50a...First part 50b...Second part 501...First end 502...Second end 503...First edge 504...Second edge 60...Frame part 70...Protective layer

Claims

1. A light guide plate; a first transparent substrate; a second transparent substrate disposed between the first transparent substrate and the light guide plate; A plurality of light-emitting elements arranged in a first direction; a liquid crystal layer disposed between the first transparent substrate and the second transparent substrate, the liquid crystal layer including streaky polymer and liquid crystal molecules; a transparent layer disposed between the first transparent substrate and the light guide plate, the transparent layer includes a plurality of band portions arranged side by side in the first direction, extending in a second direction perpendicular to the first direction, and having a refractive index lower than that of the second transparent substrate; each of the plurality of strip portions includes a first end portion located on a side facing the light emitting element and a linear second end portion opposite the first end portion; Each of the plurality of band portions includes a first portion surrounded by the first end portion and a first edge and a second edge facing each other, The display device, wherein the first edge and the second edge extend in different directions from each other.

2. Each of the plurality of band portions further includes a second portion connected to the first portion, the first portion is disposed between the second portion and the light-emitting element, The display device according to claim 1 , wherein the second portion is bounded by the second end and a third edge and a fourth edge that are parallel and opposite to each other.

3. The display device according to claim 2 , wherein the width of the first end is greater than the width of the second end.

4. a width of the first portion in the first direction gradually decreases as the width increases away from the first end, The display device according to claim 2 , wherein the width of the second portion in the first direction is substantially constant.

5. The display device according to claim 2 , wherein the length of the first portion in the second direction is greater than the length of the second portion in the second direction.

6. The plurality of band portions include a plurality of first band portions and a plurality of second band portions, The display device according to claim 1 , wherein the lengths of the first bands in the second direction are different from the lengths of the second bands in the second direction.

7. The plurality of band portions include a plurality of first band portions and a plurality of second band portions, a length in the second direction of the first portions of the plurality of first band portions is the same as a length in the second direction of the first portions of the plurality of second band portions, The display device according to claim 2 , wherein lengths of the second portions of the plurality of first bands in the second direction are different from lengths of the second portions of the plurality of second bands in the second direction.

8. The display device according to claim 6 , wherein the plurality of first band portions and the plurality of second band portions are arranged in the first direction in a random order.

9. The plurality of first band portions are arranged at a predetermined pitch in the first direction, The display device according to claim 6 , wherein the second band portions are arranged in the first direction at a pitch different from the predetermined pitch.

10. The plurality of first band portions are arranged at a predetermined pitch in the first direction, The display device according to claim 6 , wherein the second band portions are arranged in the first direction at the same pitch as the predetermined pitch.

11. The plurality of band portions include a plurality of first band portions, a plurality of second band portions, and a plurality of third band portions, The length of the second band portions in the second direction is smaller than the length of the first band portions in the second direction, The lengths of the third band portions in the second direction are smaller than the lengths of the second band portions in the second direction, The plurality of first band portions are arranged at a predetermined pitch in the first direction, the plurality of second band portions and the plurality of third band portions are arranged in the first direction at the same pitch as the predetermined pitch, The display device according to claim 1 , wherein the first band portion, the second band portion, and the third band portion are arranged in this order in the first direction.

12. the transparent layer further includes a frame portion surrounding the plurality of band portions; the first end is connected to the frame portion, The display device according to claim 1 , wherein the second end is spaced apart from the frame portion.

13. The display device further includes a display unit that displays an image and a non-display unit that surrounds the display unit, The display device according to claim 12 , wherein, in a plan view, the plurality of band portions overlap the display portion, and the frame portion overlaps the non-display portion.

14. A light guide plate; A plurality of light-emitting elements arranged in a first direction; a transparent layer; the transparent layer includes a plurality of band portions arranged side by side in the first direction, extending in a second direction perpendicular to the first direction, and having a refractive index lower than that of the light guide plate; each of the plurality of strip portions includes a first end portion located on a side facing the light emitting element and a linear second end portion opposite the first end portion; Each of the plurality of band portions includes a first portion surrounded by the first end portion and a first edge and a second edge facing each other, The first edge and the second edge extend in different directions.

15. Each of the plurality of band portions further includes a second portion connected to the first portion, the first portion is disposed between the second portion and the light-emitting element, 15. The lighting device of claim 14, wherein the second portion is bounded by the second end and opposing parallel third and fourth edges.

Images