CN108646465A - Display device - Google Patents

Abstract

A display device includes a display module and a backlight module. The backlight module is stacked on the display module. The backlight module includes a light guide plate, a plurality of light sources and a first prism sheet. The light guide plate has a light incident 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 arranged 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 arranged along the third direction. The first prism sheet is disposed on the light exit surface. The first prism sheet has a plurality of first protruding structures. The refractive index of the first protruding structure is greater than or equal to 1.6. A light provided by the light source passes through the light guide plate.

Description

display device

technical field

The invention relates to a display device, and in particular to a display device with a backlight module.

Background technique

With the advancement of science and technology, electronic products play an increasingly important role in human life, and mobile phones, computers, TVs, smart watches... and other products have more and more functions. However, energy consumption is required when using various functions of electronic products. Therefore, how to reduce the energy consumption of electronic products has become an urgent problem to be solved by all walks of life.

In an electronic product equipped with a display device, in order to display images with sufficient brightness, the backlight module of the display device often consumes 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 to be solved.

Contents of the invention

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

In at least one embodiment of the present invention, a 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 prism sheet. The light guide plate has a light incident 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 arranged on the light incident surface. There is the shortest distance between the light source and the light guide plate in the second direction. The light sources are arranged along the third direction. The first direction, the second direction and the third direction are orthogonal to each other. The first prism sheet is arranged on the light emitting surface. The first prism sheet has a plurality of first convex structures. The refractive index of the first protrusion structure is greater than or equal to 1.6. Light provided by the light source passes through the light guide plate. Taking the second direction as 90 degrees and the first direction as 0 degrees, in the light distribution of the light on the plane formed by the first direction and the second direction, part of the light exiting the light exit surface at 13 degrees to 70 degrees occupies the exiting light 35% or more of the total energy of the light rays on the surface.

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 prism sheet. The light guide plate has a light incident 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 arranged on the light incident surface. There is the shortest distance between the light source and the light guide plate in the second direction. The light sources are arranged along the third direction. The first direction, the second direction and the third direction are orthogonal to each other. The first prism sheet is arranged on the light emitting surface. The first prism sheet has a plurality of first convex structures. The refractive index of the first protrusion structure is greater than or equal to 1.6. Light provided by the light source passes through the light guide plate. Taking the second direction as 90 degrees and taking the first direction as 0 degrees, in the light distribution of the light on the plane formed by the first direction and the second direction, the maximum brightness of the light exiting the light exit surface is between 80 degrees and 90 degrees.

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

Description of drawings

FIG. 1 is a schematic oblique view of a display device according to an embodiment of the present 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 oblique view of a display device according to an embodiment of the present 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 diffuser 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.

Explanation of reference signs:

10, 20: display device

100: display module

200: backlight module

210: light guide plate

220: multiple light sources

230: first prism sheet

240: second prism sheet

250: Diffuser

A1, A2: direction

B: Bottom

D1: first direction

D2: Second direction

D3: Third direction

E: Light-emitting surface

I: incident surface

P: circuit board

P1: first raised structure

P2: Second raised structure

R: reflector

X, Y: Plane

α, γ: vertical angle

β, δ: Horizontal angle

Detailed ways

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

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

In this embodiment, the light guide plate 210 has a light incident surface I, a bottom surface B, and a light exit surface E opposite to the bottom surface B. As shown in FIG. The light guide plate 210 , the first prism sheet 230 and the display module 100 are stacked and disposed 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), for example, the microstructures are distributed on the bottom surface B and/or the light-emitting surface E. In some embodiments, the material of the light guide plate 210 is polycarbonate (Polycarbonate, PC), polymethyl methacrylate (Polymethyl methacrylate, PMMA), other polymer materials or a combination of the above materials, but the present invention is not based on This is the limit.

In this embodiment, the light source 220 is disposed on the circuit board P, for example, 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 the 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, forming an edge-type backlight module. The distance between the light source 220 and the light guide plate 210 is the shortest 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 can, for example, emit white light, blue light or light of other colors. In this embodiment, the light source 220 emitting white light is taken as an example, but the present invention is not limited thereto.

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

In some embodiments, the backlight module 200 further includes a second prism sheet 240 and a reflective sheet R. As shown in FIG. The second prism sheet 240 is disposed between the first prism sheet 230 and the light guide plate 210, and the second prism sheet 240 has a plurality of second protruding structures P2. The second protruding structures P2 are, for example, triangular prisms, and the second protruding structures P2 are arranged along a direction A2, which is, for example, perpendicular to the direction A1. In FIG. 1 , the protruding structures P1 of the first prism sheet 230 are arranged along a direction A1, and the direction A1 is substantially parallel to the second direction D2. Meanwhile, the protruding structures P2 of the second prism sheet 240 are arranged along the direction A2, and the direction A2 is substantially parallel to the third direction D3. In another modified example, the protruding structures P1 of the first prism sheet 230 can be arranged along the direction A2, and the protruding structures P2 of the second prism sheet 240 can be arranged along the direction A1. In another modified example, the direction A1 is substantially perpendicular to the direction A2, that is, the direction of the protruding structure P1 of the first prism sheet is substantially perpendicular to the direction of the protruding structure P2 of the second prism sheet, but the direction A1 is substantially perpendicular to the direction of the first prism sheet. There is an angle between the two directions D2. In other words, the direction A1 is not parallel to the second direction D2. Compared with FIG. 1, the direction A1 is based on the second direction D2 and rotated by an angle clockwise or counterclockwise to help reduce optical fringes. . The refractive index of the second protruding structure P2 is greater than or equal to 1.6. The material of the second protruding structure P2 is, for example, a crosslinked acrylic resin, other polymer materials, or a combination of the above materials, but the present invention is not limited thereto. In this embodiment, the first protruding structure P1 and the second protruding structure P2 with a refractive index greater than or equal to 1.6 can preferably cooperate with the light guide plate 210, so that the light rays leaving the first prism sheet 230 and the second prism sheet 240 more focused. Specifically, for a prism sheet with a refractive index greater than or equal to 1.6, the optimum light incident angle is 13-70 degrees.

In this embodiment, the reflective 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%. Specifically, in terms of the visible light wavelength range of 380-780nm, the reflectivity is greater than or equal to 95%, which is used to increase the optical utilization, and then 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 4 are, for example, light distribution diagrams of the light guide plate of the embodiment shown in FIG. 1 .

FIG. 2 is a light distribution diagram at different angles after the light provided by the light source 220 passes 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 after entering the light guide plate 210 and leaving the center of the light guide plate 210 at different angles.

3 is a light distribution diagram of the light provided by the light source 220 passing through the light guide plate 210 and exiting the light exit surface E at different vertical angles α, where the vertical angle α can be positive or negative. The unit of the vertical axis of FIG. 3 is nits and the unit of the horizontal axis is degree. Please refer to FIG. 1 and FIG. 3, taking the second direction D2 as 90 degrees and the first direction D1 as 0 degrees, in the light distribution of the light 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 exiting 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 first direction D1. The vertical angle α between the directions of the two directions D2 is negative. In other words, comparing with Fig. 2 at the same time, Fig. 3 corresponds to the line segment L1 in Fig. 2. In Fig. 2, the center point corresponds to 0 degrees in Fig. 3. The closer the vertical angle α is to the top of the line segment L1 in Fig. The vertical angle α is smaller the closer to the lower part of the line segment L1. In this embodiment, in the light distribution on the plane X, the part of the light that exits the light exit surface E at 13° to 70° occupies more than 35% of the total energy of the light exiting the light exit surface E, and preferably 40% or more . In other words, the light is preferably concentrated on leaving the light-emitting surface E at a vertical angle α of 13 degrees to 70 degrees, whereby the light guide plate 210 can be preferably combined with the prism sheet (such as the first prism sheet 230 and the second prism sheet 240) Cooperate to increase the optical brightness of the display device. The aforementioned energy distribution of light can be obtained, for example, from the integral area of the light distribution diagram in FIG.

In this embodiment, in the light distribution on the plane X, the maximum brightness of the light exiting the light exit surface E is located at 80°-90°. In other words, in this embodiment, the brightness of the light exiting the light exit surface E at a vertical angle α of 80° to 90° is maximum.

FIG. 4 is a light distribution diagram of light provided by the light source 220 reaching the display module 100 at different horizontal angles β, wherein the horizontal angle β can be positive or negative. The horizontal angle β is, for example, the angle between the light arriving at 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 directions in the third direction D3 is negative. In other words, referring to FIG. 2 at the same time, FIG. 3 corresponds to the line segment L2 in FIG. 2 . In some embodiments, the light emitted by the light source 220 passes through the light guide plate 210, the first prism sheet 230, the second prism sheet 240 and other optical films (such as a diffuser, a Dual Brightness Enhancement Film (DBEF) or other optical film), and then reach the display module 100. The unit of the vertical axis of FIG. 4 is nits and the unit of the horizontal axis is degree. Please refer to FIG. 1 and FIG. 4, with the third direction D3 as 90 degrees and the first direction D1 as 0 degrees, the light distribution of the light exiting the light-emitting surface E on the plane Y formed by the first direction D1 and the third direction D3 The full width at half maximum is about 49 degrees to 52 degrees, where the full width at half maximum is the half brightness angle of light before entering the display module 100, and includes the area where the horizontal angle β is negative and the area where the horizontal angle β is positive. In this way, 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, the first direction D1 is used as a reference to form a positive value and a negative value. The symmetrical viewing angle distribution of the value angle has a full width at half maximum of 49 degrees, but the present 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 of positive and negative angles is formed based on the first direction D1 .

FIG. 5 is a schematic oblique view of a display device according to an embodiment of the present invention. It must be noted here that the embodiment in FIG. 5 follows the component numbers and part of the content of the embodiment in FIG. 1 , wherein the same or similar numbers are used to denote the same or similar components, and the description of the same technical content is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, and details are not repeated here.

The main difference between the embodiment in FIG. 5 and the embodiment in FIG. 1 is that: the backlight module 200 of the display device 20 in FIG. 5 further includes a diffusion sheet 250 . The diffusion sheet 250 is, for example, disposed parallel to the light emitting surface E of the light guide plate 210 . Please refer to FIG. 5 , the diffusion sheet 250 is disposed between the light guide plate 210 and the first prism sheet 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 at different angles after the light provided by the light source 220 passes through the diffuser 250 . For example, FIG. 6 is a light distribution diagram of the light emitted by the light source 220 in FIG. 5 , after passing through the light guide plate 210 and entering the diffusion sheet 250 , leaving the center of the diffusion sheet 250 at different angles. FIG. 7 is a light distribution diagram of a light guide plate according to an embodiment of the present invention, for example, the light distribution diagram of the light guide plate in the embodiment of FIG. 5 . Specifically, FIG. 7 is a light distribution diagram of light provided by the light source 220 passing through the light guide plate 210 and exiting the light exit surface E at different vertical angles α, where the vertical angle α can be positive or negative. The unit of the vertical axis of FIG. 7 is nits and the unit of the horizontal axis is degree.

Please refer to FIG. 5 and FIG. 7, taking the second direction D2 as 90 degrees and the first direction D1 as 0 degrees, in the light distribution of the light 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 exiting the light exit 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 in FIG. 6 . In this embodiment, in the light distribution on the plane X, the part of the light that exits the light exit surface E at 13° to 70° occupies more than 35% of the total energy of the light exiting the light exit surface E, and preferably 40% or more . In other words, the light is preferably concentrated on leaving the light-emitting surface E at a vertical angle α of 13 degrees to 70 degrees, so that the light guide plate 210 can be preferably combined with the prism sheet (for example, the first prism sheet 230 and the second prism sheet 240 ) cooperate to increase the optical brightness of the display device. The energy distribution of the aforementioned light rays can be obtained, for example, from the integral area of the light distribution diagram in FIG.

In this embodiment, in the light distribution on the plane X, the maximum brightness of the light exiting the light exit surface E is located at 80°-90°. In other words, in this embodiment, the brightness of the light exiting the light exit surface E at a vertical angle α of 80° to 90° is maximum.

FIG. 8 is a light distribution diagram of a diffuser 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, for example, light distribution diagrams of the diffusion sheet of the embodiment shown in FIG. 5 .

8 is a light distribution diagram of the light provided by the light source 220 passing through the light guide plate 210 and the diffuser 250 and exiting the diffuser 250 at different vertical angles γ, where the vertical angle γ can be positive or negative. The unit of the vertical axis of FIG. 8 is nits and the unit of the horizontal axis is degree. Please refer to FIG. 5 and FIG. 8, taking the second direction D2 as 90 degrees and the first direction D1 as 0 degrees, in the light distribution of the light 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 diffuser 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 first direction D1. The vertical angle γ between the directions of the two directions D2 is negative. In other words, comparing with Fig. 6 at the same time, Fig. 8 corresponds to the line segment L1 in Fig. 6, and in Fig. 6, the center point corresponds to 0 degrees in Fig. 8, and the vertical angle γ nearer to the top of the line segment L1 in Fig. The vertical angle γ is smaller closer to below the line segment L1. In this embodiment, in the light distribution on the plane X, part of the light rays leaving the diffuser 250 at 13°-70° occupies more than 70% of the total energy of the light rays leaving the light exit surface E. In other words, the light rays are preferably concentrated to exit the diffuser 250 at a vertical angle γ of 13 degrees to 70 degrees. Thereby, the light guide plate 210 and the diffusion sheet 250 can preferably cooperate with the prism sheet (for example, the first prism sheet 230 and the second prism sheet 240 ) to increase the optical brightness of the display device. The aforementioned energy distribution of light rays can be obtained, for example, from the integral area of the light distribution diagram in FIG. 8 , that is, the integral area within the range of 13° to 70° occupies more than 70% of the total integral area.

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

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. Wherein the horizontal angle δ can be positive or negative. The horizontal angle δ is, for example, the angle between the light arriving at 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 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 in FIG. 6 . In some embodiments, the light emitted by the light source 220 will pass through the light guide plate 210, the first prism sheet 230, the second prism sheet 240 and other optical films (for example, a diffuser, a reflective polarizer or other optical films) , and then reach the display module 100 . The unit of the vertical axis of FIG. 9 is nits and the unit of the horizontal axis is degree. Please refer to FIG. 5 and FIG. 9 , with the third direction D3 being 90 degrees and the first direction D1 being 0 degrees, the light distribution of the light rays reaching the display module 100 on the plane Y formed by the first direction D1 and the third direction D3 The full width at half maximum is about 49 degrees to 52 degrees, where the full width at half maximum is the half brightness angle of light before entering the display module 100, and includes the area where the horizontal angle δ is negative and the area where the horizontal angle δ is positive. In this way, 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, the first direction D1 is used as a reference to form a positive value and a negative value. The symmetrical viewing angle distribution of the value angle has a full width at half maximum of 49 degrees, but the present 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 of positive and negative angles is formed based on the first direction D1 .

To sum up, the display device of the present invention can make the backlight module have higher brightness by adjusting the angle of the light passing through the light guide plate or the light passing through the light guide plate and the diffusion sheet, and can reduce the energy consumed by the display device. . In some embodiments, the horizontal angle of the light can be further narrowed by using the light guide plate together with the first prism sheet and the second prism sheet, so that the light can be more concentrated, and the brightness of the backlight module can be further increased.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined by the claims.

Claims (12)

1. A display device, comprising: a display module; and A backlight module, stacked on the display module along a first direction, the backlight module includes: A light guide plate has a light incident surface, a bottom surface and a light exit surface opposite to the bottom surface, and the first direction is perpendicular to the light exit surface; A plurality of light sources, arranged on the light incident surface, have the shortest distance between the light sources and the light guide plate in a second direction, and the light sources are arranged along a third direction, wherein the first direction, the second direction and the third directions are mutually orthogonal; and A first prism sheet is arranged on the light-emitting surface, and the first prism sheet has a plurality of first raised structures, and the refractive index of the first raised structures is greater than or equal to 1.6, wherein A light provided by the light sources passes through the light guide plate, where the second direction is 90 degrees and the first direction is 0 degrees, on the plane formed by the light in the first direction and the second direction In the light distribution, the part of the light exiting the light exit surface at 13°-70° occupies more than 35% of the total energy of the light exiting the light exit surface. 2. The display device according to claim 1, wherein the second direction is 90 degrees and the first direction is 0 degrees, the light on the plane formed by the first direction and the second direction of the light In the distribution, the maximum brightness of the light leaving the light-emitting surface is between 80 degrees and 90 degrees. 3. The display device as claimed in claim 1, wherein the backlight module further comprises: A second prism sheet, arranged between the first prism sheet and the light guide plate, and the second prism sheet has a plurality of second raised structures, and the refractive index of the second raised structures is greater than or equal to 1.6 . 4. The display device as claimed in claim 1, wherein the backlight module further comprises: A reflection sheet is arranged on the bottom surface of the light guide plate, and the reflection rate of the reflection sheet is greater than or equal to 95%. 5. The display device as claimed in claim 1, wherein the third direction is 90 degrees and the first direction is 0 degrees, the light rays arriving at the display module are formed by the first direction and the third direction The full width at half maximum of the light distribution on a plane is about 49 degrees to 52 degrees. 6. The display device as claimed in claim 1, wherein the backlight module further comprises: A diffusion sheet is arranged between the light guide plate and the first prism sheet, and the light passes through the diffusion sheet, where the second direction is 90 degrees and the first direction is 0 degrees, when the light is at the In the light distribution on the plane formed by the first direction and the second direction, the part of the light that leaves the diffuser at 13°-70° occupies more than 70% of the total energy of the light. 7. The display device as claimed in claim 6 , wherein the third direction is 90 degrees and the first direction is 0 degrees, the light rays arriving at the display module are formed by the first direction and the third direction The full width at half maximum of the light distribution on a plane is about 49 degrees to 52 degrees. 8. The display device as claimed in claim 1, wherein the backlight module comprises: A reflection sheet is arranged on the bottom surface of the light guide plate, and the reflection sheet includes diffusion particles. 9. A display device comprising: a display module; and A backlight module is stacked on the display module in a first direction, and the backlight module includes: A light guide plate has a light incident surface, a bottom surface and a light exit surface opposite to the bottom surface; A plurality of light sources, arranged on the light incident surface, have the shortest distance between the light sources and the light guide plate in a second direction, and the light sources are arranged along a third direction, wherein the first direction, the second direction and the third directions are mutually orthogonal; and A first prism sheet is arranged on the light-emitting surface, and the first prism sheet has a plurality of first raised structures, and the refractive index of the first raised structures is greater than or equal to 1.6, wherein A light provided by the light sources passes through the light guide plate, where the second direction is 90 degrees and the first direction is 0 degrees, on the plane formed by the light 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. 10. The display device as claimed in claim 9 , wherein the third direction is 90 degrees and the first direction is 0 degrees, the light rays arriving at the display module are formed by the first direction and the third direction The full width at half maximum of the light distribution on a plane is about 49 degrees to 52 degrees. 11. The display device as claimed in claim 9, wherein the backlight module further comprises: A diffusion sheet is arranged between the light guide plate and the first prism sheet, and the light passes through the diffusion sheet, where the second direction is 90 degrees and the first direction is 0 degrees, when the light is at the In the light distribution on the plane formed by the first direction and the second direction, the part of the light away from the light-emitting surface at 13°-70° occupies more than 70% of the total energy of the light. 12. The display device as claimed in claim 11 , wherein the third direction is 90 degrees and the first direction is 0 degrees, the light rays arriving at the display module are formed by the first direction and the third direction The full width at half maximum of the light distribution on a plane is about 49 degrees to 52 degrees.