CN104713031A - Composite prism unit, backlight module and display device - Google Patents

Abstract

The invention relates to the field of display technology, in particular to a composite prism unit, a backlight module and a display device. The composite prism unit includes a substrate, an upper prism sheet and a lower prism sheet respectively located on the upper and lower surfaces of the substrate; the prism protrusions in the lower prism sheet protrude away from the direction of the substrate, and the prism protrusions are arranged in waves along the Y direction The protruding direction of the prism protrusions in the upper prism sheet is opposite to that of the prism protrusions in the lower prism sheet, and the prism protrusions in the upper prism sheet are arranged in waves along the X direction; the Y direction and the X direction are perpendicular to each other. The composite prism unit, backlight module, and display device provided by the present invention can effectively increase the brightness viewing angle in the left and right directions by setting the prism orientation and arrangement direction of the upper prism sheet and the lower prism sheet, so that the viewing angle of 20° to 50° in the left and right The brightness in the range is the largest, and the brightness of the 0° viewing angle is reduced, which can be applied to car display, two-person entertainment display, etc.

Description

Composite prism unit, backlight module, and display device

technical field

The invention relates to the field of display technology, in particular to a composite prism unit, a backlight module and a display device.

Background technique

In liquid crystal displays, a backlight module is usually used to provide a light source. As shown in Figure 1, the prism unit in the backlight module of the prior art includes an upper prism sheet 1' and a lower prism sheet 2', the upper prism sheet 1' and the lower prism sheet 2' both use the prism direction upward, and the upper and lower prism sheets The angles of the two prisms are perpendicular to each other so as to achieve the function of converging the light and maximize the brightness of the backlight at a viewing angle of 0°. However, it is found in practical applications that this structure limits the brightness and viewing angle of the liquid crystal display module. When the viewing angle increases, the brightness will decrease significantly. It has great advantages in large-size display, public display, vehicle display, and entertainment display for two people (requires low brightness at 0° viewing angle, high brightness at 20°-50° viewing angle), etc. For large limitations, refer to Figure 2.

Contents of the invention

(1) Technical problems to be solved

The object of the present invention is to provide a compound prism unit, backlight module, and display device to overcome the defects that the prism unit in the prior art limits the brightness viewing angle of the display module, and the brightness display is limited in a large-size display mode. .

(2) Technical solutions

In order to solve the above problems, the present invention provides a compound prism unit on the one hand, comprising: a substrate, an upper prism sheet and a lower prism sheet respectively located on the upper and lower surfaces of the substrate;

The prism protrusions in the lower prism sheet protrude away from the direction of the substrate, and the prism protrusions are arranged in waves along the Y direction;

The protruding direction of the prism protrusions in the upper prism sheet is opposite to that of the prism protrusions in the lower prism sheet, and the prism protrusions in the upper prism sheet are arranged in waves along the X direction;

The Y direction and the X direction are perpendicular to each other.

Preferably, the cross section of the prism protrusions in the upper prism sheet along the Y direction is a triangle, and the apex of the triangle is an acute angle or a rounded angle.

Preferably, the cross section of the prism protrusions in the upper prism sheet along the Y direction is semicircular.

Preferably, the cross-section of the prism protrusions in the lower prism sheet along the X direction is a triangle, and the apex of the triangle is an acute angle or a rounded angle.

Preferably, the cross-section of the prism protrusions in the lower prism sheet along the X direction is semicircular.

Preferably, the substrate is made of polyester material.

Preferably, the upper prism sheet and/or the lower prism sheet are made of resin material.

On the other hand, the present invention also provides a backlight module, including the compound prism unit mentioned above.

In yet another aspect, the present invention also provides a display device, including the above-mentioned backlight module.

(3) Beneficial effects

The invention provides a compound prism unit, a backlight module, and a display device. By setting the prism orientation and arrangement direction of the upper prism sheet and the lower prism sheet, the brightness viewing angle in the left and right directions can be effectively increased, so that the left and right 20°-50° The brightness within the viewing angle range is the largest, while the brightness of the 0° viewing angle is reduced. It can be applied to car display, two-person entertainment display, etc., so that the brightness of the screen is the largest when viewed from the left and right sides, and the brightness is reduced when viewed from other directions, reaching 0° viewing angle. The lower brightness is small, and the display effect with high brightness within the viewing angle range of 20° to 50° improves the user's visual experience.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a prism unit in the prior art;

Fig. 2 is the luminance viewing angle simulation curve based on the structure of Fig. 1 in the prior art;

Figure 3 is a schematic structural view of a composite prism sheet according to an embodiment of the present invention;

4 is a schematic diagram of the structure and light of the prism sheet under the composite prism sheet of the embodiment of the present invention;

Fig. 5 is a brightness viewing angle simulation curve based on the structure of Fig. 4;

6 is a schematic diagram of another structure and light of the prism sheet under the composite prism sheet according to the embodiment of the present invention;

Fig. 7 is a brightness viewing angle simulation curve based on the structure of Fig. 6;

Fig. 8 is a schematic diagram of another structure and light of the lower prism sheet of the compound prism sheet according to the embodiment of the present invention;

FIG. 9 is a simulation curve of brightness viewing angle based on the structure in FIG. 8 .

in:

A. Outgoing light; 1. Substrate; 2. Upper prism sheet; 3. Lower prism sheet; B. Incident light.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Fig. 3, the present invention provides a kind of composite prism unit, it comprises: substrate 1, the upper prism sheet 2 and the lower prism sheet 3 that are positioned at the upper and lower surface of substrate 1 respectively;

The prism protrusions in the lower prism sheet 3 protrude away from the substrate 1, and the prism protrusions are arranged in waves along the Y direction;

The protruding direction of the prism protrusions in the upper prism sheet 2 is opposite to that of the prism protrusions in the lower prism sheet 3, and the prism protrusions in the upper prism sheet 2 are arranged in waves along the X direction;

The Y direction and the X direction are perpendicular to each other.

Continuing to refer to Fig. 3, two beams of parallel incident rays B are vertically incident on the composite prism unit, and after the action of the lower prism sheet 3 and the upper prism sheet 2, the direction of the outgoing ray A changes greatly, making the rays go to the left and right diffused to maximize brightness on the left and right sides.

By setting the prism orientation and arrangement direction of the upper prism sheet 2 and the lower prism sheet 3, the brightness viewing angle in the left and right directions can be effectively increased, so that the brightness in the viewing angle range of 20° to 50° from the left and right is the largest, while the brightness in the viewing angle of 0° is reduced , can be applied to car display, two-person entertainment display, etc., which can make the screen brightness the largest when viewed from the left and right sides, while the brightness is reduced when viewed from other directions. The display effect improves the user's visual experience.

The cross-section of the prism protrusion in the upper prism sheet 2 in the Y direction is a triangle or a semicircle, and the apex angle of the triangle is an acute angle or a rounded angle. The divergent rays from the sides are converged to reduce the viewing angle in the up and down directions.

As shown in FIG. 4 , the cross-section of the prism protrusions in the lower prism sheet 3 in the present embodiment along the X direction is a triangle, and the apex angle of the triangle is an acute angle. The cross-section of the prism protrusion is triangular, and the apex angle of the triangle is set in the shape of an acute angle, so that the light on the left and right sides diverges to both sides (the divergence angle is θ1), thereby improving the brightness viewing angle in the left and right directions, making the left and right 20°～ The brightness within the viewing angle range of 50° is the largest, while the brightness at viewing angle of 0° decreases. Refer to Figure 5 for the specific brightness curve.

In addition, as shown in FIG. 6 , the cross-section of the prism protrusions in the lower prism sheet 3 in this embodiment can also be triangular, and the apex of the triangle is rounded. The cross-section of the prism protrusion is triangular, and the top angle of the triangle is rounded, so that the light on the left and right sides diverges to both sides (the divergence angle is θ2), thereby improving the brightness viewing angle in the left and right directions, making the left and right 20 ° ~ 50 The brightness in the viewing angle range of ° is the largest, while the brightness in the viewing angle of 0° is reduced. Refer to Figure 7 for the specific brightness curve.

In addition, as shown in Figure 8, the cross-section of the prism protrusions along the Y direction in the lower prism sheet 3 in this embodiment can also be semicircular, and the cross-section of the prism protrusions is set as a semicircle, so that the left and right sides The light from the light diverges to both sides (the divergence angle is θ3), thereby increasing the brightness viewing angle in the left and right directions, making the brightness in the range of 20° to 50° left and right viewing angles maximum, while the brightness at 0° viewing angle decreases. For the specific brightness curve, refer to Figure 9 .

Among them, the substrate 1 in this embodiment is preferably made of polyester material, and the upper prism sheet 2 and/or the lower prism sheet 3 are preferably made of resin material.

It should be noted that, in addition to being made of polyester material, the base material 1 can also be made of other materials having the same or similar physical properties as the polyester material.

In addition to being made of resin material, the upper prism sheet 2 and/or the lower prism 3 can also be made of other materials having the same or similar physical properties as the resin material.

On the other hand, the present invention also provides a backlight module, including the compound prism unit mentioned above.

In yet another aspect, the present invention also provides a display device, including the above-mentioned backlight module. The display device may be an electronic product such as a liquid crystal display, a liquid crystal TV, a tablet computer, a mobile phone, and an electronic book.

The composite prism unit, backlight module, and display device provided by the present invention can effectively increase the brightness viewing angle in the left and right directions by setting the prism orientation and arrangement direction of the upper prism sheet and the lower prism sheet, so that the viewing angle of 20° to 50° in the left and right The brightness within the range is the largest, while the brightness of the 0° viewing angle is reduced. It can be applied to car display, two-person entertainment display, etc., so that the brightness of the screen is the largest when viewed from the left and right sides, and the brightness is reduced when viewed from other directions, reaching 0° viewing angle. The brightness is small, and the display effect with high brightness within the viewing angle range of 20° to 50° improves the user's visual experience.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (9)

1. a composite prism unit, is characterized in that, comprising: base material, lays respectively at the upper prismatic lens on the upper and lower surface of described base material and lower prismatic lens;

Prism jut in described lower prismatic lens is described base material direction projection dorsad, and described prism jut arranges along Y-direction undulate;

The projection direction of the prism jut in described upper prismatic lens is contrary with the projection direction of prism jut in lower prismatic lens, and the prism jut undulate arrangement in X direction in described upper prismatic lens;

Described Y-direction and X-direction are mutually vertical.

2. composite prism unit as claimed in claim 1, it is characterized in that, in described upper prismatic lens, prism jut is triangle along the cross section of Y-direction, and described leg-of-mutton drift angle is acute angle or fillet.

3. composite prism unit as claimed in claim 1, is characterized in that, in described upper prismatic lens, prism jut is semicircle along the cross section of Y-direction.

4. composite prism unit as claimed in claim 1, it is characterized in that, in described lower prismatic lens, prism jut cross section is in X direction triangle, and described leg-of-mutton drift angle is acute angle or fillet.

5. composite prism unit as claimed in claim 1, is characterized in that, in described lower prismatic lens, prism jut cross section is in X direction semicircle.

6. composite prism unit as claimed in claim 1, it is characterized in that, described base material is made by polyester material.

7. composite prism unit as claimed in claim 1, it is characterized in that, described upper prismatic lens and/or lower prismatic lens are made by resin material.

8. a backlight module, is characterized in that, comprises the composite prism unit described in any one of claim 1-7.

9. a display unit, is characterized in that, comprises backlight module according to claim 8.