TWI657277B - Display device - Google Patents

Abstract

A display device includes a display module and a backlight module. Backlight module Stacked on the display module. The backlight module includes a light guide plate, a plurality of light sources, and a first diaphragm. The light guide plate has a light entrance surface, a bottom surface, and a light exit surface opposite to the bottom surface. The first direction is perpendicular to the light emitting surface. The light source is disposed on the light incident surface. The light source and the light guide plate have the shortest distance in the second direction. The light sources are aligned along the third direction. The first diaphragm is disposed on the light emitting surface. The first diaphragm has a plurality of first raised structures. The refractive index of the first raised structure is greater than or equal to 1.6. One of the light provided by the light source passes through the light guide plate.

Description

Display device

The present invention relates to a display device, and more particularly to a display device with a backlight module.

With the advancement of technology, the role of electronic products in human life is becoming more and more important, and the functions of mobile phones, computers, televisions, smart watches, etc. are also increasing. However, energy needs to be consumed when using various functions of electronic products. Therefore, how to reduce the energy loss of electronic products has become an urgent problem to be solved by various circles.

In an electronic product provided with a display device, in order to display a screen with sufficient brightness, the backlight module of the display device often needs to consume a lot of energy. In some portable electronic products (such as mobile phones, tablet computers, etc.), if the power consumption of the display device is too high, the electronic products are prone to the problem of insufficient battery life. Therefore, how to reduce the power consumption of the display device has become an urgent problem.

The invention provides a display device, which can save the consumption required by a backlight module. Of energy.

In at least one embodiment of the present invention, the display device includes a display module and a backlight module. The backlight module is stacked on the display module along the first direction. The backlight module includes a light guide plate, a plurality of light sources, and a first diaphragm. The light guide plate has a light entrance surface, a bottom surface, and a light exit surface opposite to the bottom surface. The first direction is perpendicular to the light emitting surface. A plurality of light sources are disposed on the light incident surface. The light source and the light guide plate have the shortest distance in the second direction. The light sources are aligned along the third direction. The first direction, the second direction, and the third direction are orthogonal to each other. The first diaphragm is disposed on the light emitting surface. The first diaphragm has a plurality of first raised structures. The refractive index of the first raised structure is greater than or equal to 1.6. The light provided by the light source passes through the light guide plate. With the second direction being 90 degrees and the first direction being 0 degrees, in the light distribution on the plane formed by the light in the first direction and the second direction, part of the light leaving the light emitting surface at 13 degrees to 70 degrees occupies and leaves the light. More than 35% of the total energy of the surface light.

The display device includes a display module and a backlight module. The backlight module is stacked on the display module in the first direction. The backlight module includes a light guide plate, a plurality of light sources, and a first diaphragm. The light guide plate has a light entrance surface, a bottom surface, and a light exit surface opposite to the bottom surface. The first direction is perpendicular to the light emitting surface. A plurality of light sources are disposed on the light incident surface. The light source and the light guide plate have the shortest distance in the second direction. The light sources are aligned along the third direction. The first direction, the second direction, and the third direction are orthogonal to each other. The first diaphragm is disposed on the light emitting surface. The first diaphragm has a plurality of first raised structures. The refractive index of the first raised structure is greater than or equal to 1.6. The light provided by the light source passes through the light guide plate. With the second direction being 90 degrees and the first direction being 0 degrees, in the light distribution on the plane formed by the light in the first direction and the second direction, the maximum brightness of the light leaving the light emitting surface is between 80 degrees and 90 degrees.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

10, 20‧‧‧ display device

100‧‧‧Display Module

200‧‧‧ backlight module

210‧‧‧light guide

220‧‧‧ multiple light sources

230‧‧‧ first cymbal

240‧‧‧Second cymbal

250‧‧‧ diffuser

A1, A2‧‧‧ direction

B‧‧‧ underside

D1‧‧‧ first direction

D2‧‧‧ Second direction

D3‧‧‧ Third direction

E‧‧‧light surface

I‧‧‧ entrance

P‧‧‧Circuit Board

P1‧‧‧First raised structure

P2‧‧‧Second raised structure

R‧‧‧Reflector

X, Y‧‧‧ plane

α, γ‧‧‧ vertical angle

β, δ‧‧‧ horizontal angle

FIG. 1 is a schematic perspective view of a display device according to an embodiment of the invention.

FIG. 2 is a light distribution diagram of a light guide plate according to an embodiment of the present invention.

FIG. 3 is a light distribution diagram of a light guide plate according to an embodiment of the present invention.

FIG. 4 is a light distribution diagram of a light guide plate according to an embodiment of the present invention.

FIG. 5 is a schematic perspective view of a display device according to an embodiment of the invention.

FIG. 6 is a light distribution diagram of a diffusion sheet according to an embodiment of the present invention.

FIG. 7 is a light distribution diagram of a light guide plate according to an embodiment of the present invention.

FIG. 8 is a light distribution diagram of a diffusion sheet according to an embodiment of the present invention.

FIG. 9 is a light distribution diagram of a diffusion sheet according to an embodiment of the present invention.

FIG. 1 is a schematic perspective view of a display device according to an embodiment of the invention.

Please refer to FIG. 1. In this embodiment, the display device 10 includes a display module 100 and a backlight module 200. The backlight module 200 is stacked on the display in a first direction. Module 100. The backlight module 200 includes a light guide plate 210, a plurality of light sources 220, and a first cymbal 230.

In this embodiment, the light guide plate 210 has a light incident surface I, a bottom surface B, and a light emitting surface E opposite to the bottom surface B. The light guide plate 210, the first cymbal 230, and the display module 100 are disposed overlapping each other along the first direction D1. In other words, the first direction D1 is substantially perpendicular to the light emitting surface E. In some embodiments, the bottom surface B and / or the light emitting surface E of the light guide plate 210 has a plurality of microstructures (not shown). The microstructures are distributed on the bottom surface B and / or the light emitting surface E, for example. In some embodiments, the material of the light guide plate 210 is, for example, polycarbonate (PC), polymethyl methacrylate (PMMA), other polymer materials, or a combination of the foregoing materials. This is limited.

In this embodiment, the light source 220 is disposed on the circuit board P, and the light source 220 is disposed on the light incident surface I of the light guide plate 210, that is, the position of the light source 220 corresponds to the light incident surface I. In FIG. 1, the light source 220 is disposed on a side surface of the light guide plate 210 (such as the light incident surface I), so that the light provided by the light source 220 enters the light guide plate from the side surface of the light guide plate to form a side-type backlight module. The light source 220 and the light guide plate 210 have the shortest distance in the second direction D2, and the plurality of light sources 220 are arranged along the third direction D3. Specifically, the second direction D2 is substantially perpendicular to the light incident surface I, the third direction D3 is substantially parallel to the light incident surface I, and the first direction D1, the second direction D2, and the third direction D3 are substantially orthogonal to each other. The light source 220 may emit, for example, white light, blue light, or other colors of light. In this embodiment, the white light source 220 is used as an example, but the present invention is not limited thereto.

In this embodiment, the first cymbal 230 is disposed on the light emitting surface E, so that the first cymbal 230 is located between the display module 100 and the light guide plate 210. The first diaphragm 230 has a plurality of first protruding structures P1. The first convex structure P1 is, for example, a triangular column shape, and the first convex structures P1 are arranged along the direction A1. The refractive index of the first convex structure P1 is greater than or equal to 1.6. The material of the first protruding structure P1 is, for example, a highly crosslinked acrylic resin, other polymer materials, or a combination of the foregoing materials, but the present invention is not limited thereto.

In some embodiments, the backlight module 200 further includes a second mask 240 and a reflective sheet R. The second cymbal 240 is disposed between the first cymbal 230 and the light guide plate 210, and the second cymbal 240 has a plurality of second protruding structures P2. The second convex structure P2 is, for example, a triangular column shape, and the second convex structures P2 are arranged along the direction A2, and the direction A2 is, for example, perpendicular to the direction A1. In FIG. 1, the protruding structures P1 of the first diaphragm 230 are arranged along the direction A1, and the direction A1 is substantially parallel to the second direction D2. At the same time, the protruding structures P2 of the second cymbal 240 are arranged along the direction A2, and the direction A2 is substantially parallel to the third direction D3. In another modification, the convex structures P1 of the first cymbal 230 can be arranged along the direction A2, and the convex structures P2 of the second cymbal 240 can be arranged along the direction A1. In another modification, the direction A1 is substantially perpendicular to the direction A2, that is, the direction of the convex structure P1 of the first cymbal and the direction of the convex structure P2 of the second cymbal are substantially orthogonal, but the direction A1 and the first There is an angle between the two directions D2. In other words, the direction A1 and the second direction D2 are not parallel. Compared to FIG. 1, the direction A1 is based on the second direction D2 and rotated by an angle in a clockwise or counterclockwise direction, which helps reduce optical fringes. . Second convex The refractive index of the structure P2 is greater than or equal to 1.6. The material of the second protruding structure P2 is, for example, a highly crosslinked acrylic resin, other polymer materials, or a combination of the foregoing materials, but the present invention is not limited thereto. In this embodiment, the first convex structure P1 and the second convex structure P2 with a refractive index greater than or equal to 1.6 can better cooperate with the light guide plate 210, so that the The light is more concentrated. Specifically, for a diaphragm with a refractive index greater than or equal to 1.6, the optimal light incident angle is 13 to 70 degrees.

In this embodiment, the reflection sheet R is disposed on the bottom surface B of the light guide plate 210. In some embodiments, the reflectance of the reflective sheet R is greater than or equal to 95%. In particular, when the visible light wavelength range is 380 to 780 nm, the reflectance is greater than or equal to 95%, which is used to increase the optical utilization rate, and Increase brightness. In some embodiments, the reflective sheet further includes diffusion particles, which can reduce the situation that the reflective sheet is adsorbed on the light guide plate, but the present invention is not limited thereto.

FIG. 2 is a light distribution diagram of a light guide plate according to an embodiment of the present invention. FIG. 3 is a light distribution diagram of a light guide plate according to an embodiment of the present invention. FIG. 4 is a light distribution diagram of a light guide plate according to an embodiment of the present invention. 2 to FIG. 4 are light distribution diagrams of the light guide plate of the embodiment of FIG. 1, for example.

FIG. 2 is a light distribution diagram of light provided by the light source 220 at different angles after passing through the light guide plate 210. For example, FIG. 2 is a light distribution diagram of the light emitted by the light source 220 in FIG. 1 leaving the center of the light guide plate 210 at different angles after entering the light guide plate 210.

FIG. 3 shows the light provided by the light source 220 after passing through the light guide plate 210, Light distribution diagrams of rays leaving the light emitting surface E at different vertical angles α, where the vertical angle α can be positive or negative. The unit of the vertical axis in FIG. 3 is nits and the unit of the horizontal axis is degrees. Please refer to FIG. 1 and FIG. 3, with the second direction D2 being 90 degrees and the first direction D1 being 0 degrees, in the light distribution on the plane X formed by the first direction D1 and the second direction D2, the vertical angle α is, for example, the angle between the light leaving the light emitting surface E and the first direction D1 on the plane X, and the vertical angle α between the first direction D1 and the second direction D2 is a positive value, and the first direction D1 is opposite to the second direction The vertical angle α between the directions of the direction D2 is negative. In other words, referring to FIG. 2 at the same time, FIG. 3 corresponds to the line segment L1 of FIG. 2. In FIG. 2, the center point corresponds to 0 degree of FIG. 3. The closer to the line segment L1 in FIG. 2 is, the larger the vertical angle α is. The smaller the vertical angle α near the line segment L1. In this embodiment, in the light distribution on the plane X, part of the light leaving the light emitting surface E at 13 to 70 degrees occupies more than 35% of the total energy of the light leaving the light emitting surface E, and more than 40% good. In other words, the light is preferably focused away from the light exit surface E at a vertical angle α of 13 ° to 70 °, thereby the light guide plate 210 can be better aligned with the cymbals (for example, the first and second cymbals 230 and 2 240) Cooperate to increase the optical brightness of the display device. The energy distribution of the aforementioned light can be obtained, for example, from the integrated area of the light distribution diagram in FIG. 3, that is, the integrated area in the range of 13 degrees to 70 degrees occupies more than 35% of the total integrated area, and more preferably 40% or more .

In this embodiment, in the light distribution on the plane X, the maximum brightness of the light leaving the light emitting surface E is between 80 degrees and 90 degrees. In other words, in this embodiment, the brightness of the light leaving the light emitting surface E at a vertical angle α of 80 degrees to 90 degrees is the largest.

FIG. 4 shows the light provided by the light source 220 arriving at different horizontal angles β. The light distribution diagram of the light of the module 100, wherein the horizontal angle β can be a positive value or a negative value. The horizontal angle β is, for example, an angle between the light reaching the display module 100 and the first direction D1 on the plane Y, and the horizontal angle β between the first direction D1 and the third direction D3 is a positive value, and the first direction D1 is opposite to The horizontal angle β between the directions in the third direction D3 is negative. In other words, referring to FIG. 2 at the same time, FIG. 4 corresponds to the line segment L2 of FIG. 2. In some embodiments, the light emitted by the light source 220 passes through the light guide plate 210, the first fascia 230, the second fascia 240, and other optical films (e.g., a diffusion film, dual brightness enhancement film (DBEF) Or other optical film), and then arrive at the display module 100. The unit of the vertical axis in FIG. 4 is nits and the unit of the horizontal axis is degrees. Please refer to FIGS. 1 and 4, with the third direction D3 being 90 degrees and the first direction D1 being 0 degrees, the light distribution on the plane Y formed by the first direction D1 and the third direction D3 from the light exiting the light emitting surface E. The FWHM is about 49 degrees to 52 degrees, where the FWHM is the half-brightness angle of the light before it enters the display module 100, and includes the area where the horizontal angle β is negative and the horizontal angle β is positive. Area, whereby the light emitted by the backlight module 200 can be more collimated. In some embodiments, the viewing angle of the display device is -24.5 to +24.5 degrees, that is, a positive value is formed based on the first direction D1, The symmetrical viewing angle distribution of negative angles has a FWHM of 49 degrees, but the invention is not limited thereto. In other embodiments, the viewing angle of the display device may be -10 to +39 degrees, that is, an asymmetric viewing angle distribution with positive and negative angles is formed based on the first direction D1.

FIG. 5 is a schematic perspective view of a display device according to an embodiment of the invention. It must be noted here that the embodiment of FIG. 5 follows the component numbers and parts of the embodiment of FIG. 1, and the same or similar reference numerals are used to indicate the same or near Similar elements, and the description of the same technical content is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and details are not described herein.

The main difference between the embodiment of FIG. 5 and the embodiment of FIG. 1 is that the backlight module 200 of the display device 20 of FIG. 5 further includes a diffusion sheet 250. The diffusion sheet 250 is provided in parallel to the light exit surface E of the light guide plate 210, for example. Please refer to FIG. 5, a diffusion sheet 250 is disposed between the light guide plate 210 and the first diaphragm 230.

FIG. 6 is a light distribution diagram of a diffusion sheet according to an embodiment of the present invention. FIG. 6 is a light distribution diagram of light provided by the light source 220 at different angles after passing through the diffusion sheet 250. For example, FIG. 6 is a light distribution diagram of the light emitted by the light source 220 in FIG. 5 leaving the center of the diffusion sheet 250 at different angles after passing through the light guide plate 210 and entering the diffusion sheet 250. FIG. 7 is a light distribution diagram of a light guide plate according to an embodiment of the present invention, such as a light distribution diagram of the light guide plate of the embodiment of FIG. 5. Specifically, FIG. 7 is a light distribution diagram of the light rays provided by the light source 220 leaving the light emitting surface E at different vertical angles α after passing through the light guide plate 210, wherein the vertical angle α may be a positive value or a negative value. The unit of the vertical axis in FIG. 7 is nits and the unit of the horizontal axis is degrees.

Please refer to FIGS. 5 and 7, with the second direction D2 being 90 degrees and the first direction D1 being 0 degrees, in the light distribution on the plane X formed by the first direction D1 and the second direction D2, the vertical angle α is, for example, an angle between the light leaving the light emitting surface E and the first direction D1 on the plane X. In other words, referring to FIG. 6 at the same time, FIG. 7 corresponds to the line segment L1 of FIG. 6. In this embodiment, in the light distribution on the plane X, a part of the light rays leaving the light emitting surface E at 13 to 70 degrees occupy the total light rays leaving the light emitting surface E. More than 35% of the energy, of which more than 40% is better. In other words, the light is preferably focused away from the light exit surface E at a vertical angle α of 13 ° to 70 °, thereby the light guide plate 210 can be better aligned with the cymbals (for example, the first cymbal 230 and the second cymbal 240) Cooperate to increase the optical brightness of the display device. The energy distribution of the aforementioned light can be obtained, for example, from the integrated area of the light distribution diagram in FIG. 6, that is, the integrated area in the range of 13 degrees to 70 degrees occupies more than 35% of the total integrated area, and more preferably 40% or more .

In this embodiment, in the light distribution on the plane X, the maximum brightness of the light leaving the light emitting surface E is between 80 degrees and 90 degrees. In other words, in this embodiment, the brightness of the light leaving the light emitting surface E at a vertical angle α of 80 degrees to 90 degrees is the largest.

FIG. 8 is a light distribution diagram of a diffusion sheet according to an embodiment of the present invention. FIG. 9 is a light distribution diagram of a diffusion sheet according to an embodiment of the present invention. 7 to 9 are light distribution diagrams of the diffusion sheet of the embodiment of FIG. 5, for example.

FIG. 8 is a light distribution diagram of light provided by the light source 220 after passing through the light guide plate 210 and the diffusion sheet 250 and leaving the diffusion sheet 250 at different vertical angles γ. The vertical angle γ can be positive or negative. The unit of the vertical axis in FIG. 8 is nits and the unit of the horizontal axis is degrees. Please refer to FIG. 5 and FIG. 8, with the second direction D2 being 90 degrees and the first direction D1 being 0 degrees, in the light distribution on the plane X formed by the first direction D1 and the second direction D2, the vertical angle γ is, for example, the angle between the light leaving the diffusion sheet 250 and the first direction D1 on the plane X, and the vertical angle γ between the first direction D1 and the second direction D2 is a positive value, and the first direction D1 is opposite to the second direction The vertical angle γ between the directions of the direction D2 is negative. In other words, referring to FIG. 6 at the same time, FIG. 8 corresponds to the line segment L1 of FIG. 6. In FIG. 6, the center point corresponds to 0 degree of FIG. 8. The larger the vertical angle γ near the line segment L1 is, the smaller the vertical angle γ near the line segment L1 in FIG. 6 is. In this embodiment, in the light distribution on the plane X, part of the light leaving the diffusion sheet 250 at 13 to 70 degrees occupies more than 70% of the total energy of the light leaving the light emitting surface E. In other words, the light is preferably focused on leaving the diffusion sheet 250 at a vertical angle γ of 13 degrees to 70 degrees. Thereby, the light guide plate 210 and the diffusion sheet 250 can better cooperate with the cymbal (for example, the first cymbal 230 and the second cymbal 240) to increase the optical brightness of the display device. The energy distribution of the aforementioned light can be obtained, for example, from the integrated area of the light distribution diagram in FIG. 8, that is, the integrated area in the range of 13 degrees to 70 degrees occupies more than 70% of the total integrated area.

In this embodiment, in the light distribution on the plane X, the maximum brightness of the light leaving the diffusion sheet 250 is between 40 degrees and 60 degrees. In other words, in this embodiment, the brightness of the light leaving the light emitting surface E at a vertical angle γ of 40 degrees to 60 degrees is the largest.

FIG. 9 is a light distribution diagram of light rays provided by the light source 220 reaching the display module 100 at different horizontal angles δ. The horizontal angle δ can be a positive value or a negative value. The horizontal angle δ is, for example, an angle between the light reaching the display module 100 and the first direction D1 on the plane Y, and the horizontal angle δ between the first direction D1 and the third direction D3 is a positive value, and the first direction D1 is opposite to The horizontal angle δ between the directions in the third direction D3 is negative. In other words, referring to FIG. 6 at the same time, FIG. 9 corresponds to the line segment L2 of FIG. 6. In some embodiments, the light emitted by the light source 220 passes through the light guide plate 210, the first diaphragm 230, the second diaphragm 240, and other optical films (such as a diffuser, a reflective polarized light enhancement film, or other optical films). , And then arrive at the display module 100. The unit of the vertical axis in FIG. 9 is nits and the unit of the horizontal axis is degrees. Please refer to FIG. 5 and FIG. The direction D3 is 90 degrees and the first direction D1 is 0 degrees. The full width at half maximum height of the light distribution on the plane Y formed by the first direction D1 and the third direction D3 of the light reaching the display module 100 is about 49 degrees to 52 degrees. Degrees, where the full width at half maximum is the half-brightness angle of the light before it enters the display module 100, and includes a region where the horizontal angle δ is negative and a region where the horizontal angle δ is positive. The emitted light can be more collimated. In some embodiments, the viewing angle of the display device is -24.5 to +24.5 degrees, that is, a symmetrical viewing angle distribution with positive and negative angles is formed based on the first direction D1. The height and width are 49 degrees, but the invention is not limited thereto. In other embodiments, the viewing angle of the display device may be -10 to +39 degrees, that is, an asymmetric viewing angle distribution with positive and negative angles is formed based on the first direction D1.

In summary, the display device of the present invention can make the backlight module have higher brightness by adjusting the angle of the light after passing through the light guide plate or the light after passing through the light guide plate and the diffusion sheet, and can reduce the consumption of the display device. Of energy. In some embodiments, the light guide plate with the first and second cymbals can further reduce the horizontal angle of the light, make the light more concentrated, and further increase the brightness of the backlight module.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (9)

A display device includes: a display module; and a backlight module stacked on the display module along a first direction. The backlight module includes: a light guide plate having a light incident surface, a bottom surface, and A light emitting surface opposite to the bottom surface, and the first direction is perpendicular to the light emitting surface; a plurality of light sources are disposed on the light incident surface, and the light sources and the light guide plate have a shortest distance in a second direction, and The light sources are arranged along a third direction, wherein the first direction, the second direction, and the third direction are orthogonal to each other; and a first diaphragm is disposed on the light emitting surface, and the first diaphragm has a plurality of First convex structures, and the refractive indexes of the first convex structures are greater than or equal to 1.6, wherein one light provided by the light sources passes through the light guide plate, wherein the second direction is 90 degrees and the first The direction is 0 degree. In the light distribution on the plane formed by the first direction and the second direction, the part of the light leaving the light exit surface at 13 to 70 degrees occupies the light exiting the light exit surface. More than 35% of total energy, and The three directions are 90 degrees and the first direction is 0 degrees. The FWHM of the light distribution on the plane formed by the first direction and the third direction of the light reaching the display module is about 49 degrees to 52 degrees. degree. The display device according to item 1 of the scope of patent application, wherein the second direction is 90 degrees and the first direction is 0 degrees, in a plane on which the light rays are formed in the first direction and the second direction. In the light distribution, the maximum brightness of the light leaving the light emitting surface is between 80 degrees and 90 degrees. The display device according to item 1 of the scope of patent application, wherein the backlight module further comprises: a second cymbal disposed between the first cymbal and the light guide plate, and the second cymbal has a plurality of The second raised structures, and the refractive indexes of the second raised structures are greater than or equal to 1.6. The display device according to item 1 of the scope of patent application, wherein the backlight module further comprises: a reflective sheet disposed on the bottom surface of the light guide plate, and the reflectance of the reflective sheet is greater than or equal to 95%. The display device according to item 1 of the scope of patent application, wherein the backlight module includes: a reflective sheet disposed on the bottom surface of the light guide plate, and the reflective sheet includes diffusion particles. A display device includes: a display module; and a backlight module stacked on the display module along a first direction. The backlight module includes: a light guide plate having a light incident surface, a bottom surface, and A light emitting surface opposite to the bottom surface, and the first direction is perpendicular to the light emitting surface; a plurality of light sources are disposed on the light incident surface, and the light sources and the light guide plate have a shortest distance in a second direction, and The light sources are arranged along a third direction, wherein the first direction, the second direction, and the third direction are orthogonal to each other; a first diaphragm is disposed on the light emitting surface, and the first diaphragm has a plurality of first A convex structure, and the refractive index of the first convex structures is greater than or equal to 1.6; and a diffusion sheet is disposed between the light guide plate and the first diaphragm, and the light passes through the diffusion sheet, wherein A light provided by the light sources passes through the light guide plate, wherein the second direction is 90 degrees and the first direction is 0 degrees. The light on the plane formed by the light in the first direction and the second direction. In the distribution, leave this at 13 ° ~ 70 ° Part of the light surface occupies more than 35% of the total energy of the light ray leaving the light exit surface, and the second direction is 90 degrees and the first direction is 0 degrees. In the light distribution on the plane formed by the second direction, a part of the light leaving the diffuser at 13 to 70 degrees occupies more than 70% of the total energy of the light. The display device according to item 6 of the scope of patent application, wherein the third direction is 90 degrees and the first direction is 0 degrees, and the light reaching the display module is in the first direction and the third direction. The full-width at half height of the light distribution on the formed plane is about 49 degrees to 52 degrees. A display device includes: a display module; and a backlight module stacked on the display module in a first direction. The backlight module includes: a light guide plate having a light incident surface, a bottom surface, and A light emitting surface opposite to the bottom surface; a plurality of light sources are disposed on the light incident surface, the light sources and the light guide plate have a shortest distance in a second direction, and the light sources are arranged along a third direction, wherein The first direction, the second direction, and the third direction are orthogonal to each other; and a first cymbal is disposed on the light emitting surface, and the first cymbal has a plurality of first convex structures, and the first The refractive index of the convex structure is greater than or equal to 1.6, wherein a light provided by the light sources passes through the light guide plate, wherein the second direction is 90 degrees and the first direction is 0 degrees. In the light distribution on a plane formed by one direction and the second direction, the maximum brightness of the light leaving the light emitting surface is between 80 degrees and 90 degrees, wherein the third direction is 90 degrees and the first direction is 0. Degrees, the light reaching the display module is Half width of light distribution on the plane configuration of the first direction and the third direction is 49 degrees to 52 degrees. A display device includes: a display module; and a backlight module stacked on the display module in a first direction. The backlight module includes: a light guide plate having a light incident surface, a bottom surface, and A light emitting surface opposite to the bottom surface; a plurality of light sources are disposed on the light incident surface, the light sources and the light guide plate have a shortest distance in a second direction, and the light sources are arranged along a third direction, wherein The first direction, the second direction, and the third direction are orthogonal to each other; a first cymbal is disposed on the light emitting surface, and the first cymbal has a plurality of first convex structures, and the first convex structures The refractive index of the structure is greater than or equal to 1.6, wherein a light provided by the light sources passes through the light guide plate, wherein the second direction is 90 degrees and the first direction is 0 degrees. In the light distribution on the plane formed by the direction and the second direction, the maximum brightness of the light leaving the light emitting surface is between 80 degrees and 90 degrees; and a diffuser is disposed between the light guide plate and the first diaphragm. , And the light passes through the diffusion sheet, The second direction is 90 degrees and the first direction is 0 degrees. In the light distribution of the light on a plane formed by the first direction and the second direction, the light exits the light at 13 degrees to 70 degrees. Part of the light ray occupies more than 70% of the total energy of the light, and the third direction is 90 degrees and the first direction is 0 degrees. The light reaching the display module is in the first direction and the first direction. The full width at half maximum of the light distribution on the plane formed by the three directions is about 49 degrees to 52 degrees.