Optical prism, prismatic lens, backlight module and liquid crystal display device

Abstract

The invention provides an optical prism, a prismatic lens, a backlight module and a liquid crystal display device, and belongs to the technical field of display. The problem that an existing prismatic lens is low in light utilization rate and small in light emitting visual angle can be solved. The cross section of a prism of the prismatic lens is in a shape of combination of a triangle and a trapezoid, and the bottom edge of the triangle and the upper bottom of the trapezoid coincide. The prismatic lens comprises the optical prism, the backlight module comprises the prismatic lens, and the liquid crystal display device comprises the backlight module. By means of the optical prism, the prismatic lens, the backlight module and the liquid crystal display device, the light utilization rate can be improved, and the light emitting visual angle can be enlarged.

Description

technical field

[0001] The invention belongs to the field of display technology, in particular to an optical prism, a prism sheet,

[0002] A backlight module and a liquid crystal display device. Background technique

[0003] A TFT liquid crystal display generally includes two parts: a display panel and a backlight module. Among them, a prism sheet is usually provided on the light emitting surface side of the light guide plate of the backlight module, which is used to converge the light and improve the brightness of the liquid crystal display in the front view direction (perpendicular to the display plane) without increasing the total luminous flux of the outgoing light. .

[0004] Among them, such as figure 1 with figure 2 As shown, the prism sheet includes a substrate 11, a coating layer 12 and an optical prism 13. The coating layer 12 is arranged on one side of the light-incident surface of the substrate 11, which can achieve uniform light and prevent the effect of s...

Examples

Embodiment 1

[0035] This embodiment provides an optical prism, and the material of the optical prism is preferably polymethyl methacrylate. The shape of the cross section of the prism is a shape composed of a triangle and a trapezoid, wherein the base of the triangle coincides with the upper base of the trapezoid.

[0036] In this example, if Figure 5 with Image 6 As shown, preferably, the triangle is an isosceles right triangle, because the angle of the vertex angle of the optical prism is 90°, it is a better choice in terms of technology and light output effect, and the more preferred isosceles triangle The vertex angle is 90°.

[0037] The trapezoid is an isosceles trapezoid, the hypotenuse of the isosceles right triangle coincides with the upper base of the isosceles trapezoid, and the base angle 136 of the isosceles trapezoid is greater than 45 degrees, and the base angle is represented by α. That is to say, the lower half of the cross-section of the optical prism is changed into...

Embodiment 2

[0052] This embodiment provides a prism sheet, such as Figure 5 with Image 6 As shown, it includes a base body 11. A plurality of optical prisms 13 provided in Embodiment 1 are provided on one side of the light-emitting surface of the base body 11. The material of the optical prisms 13 is polymethyl methacrylate, which plays the role of converging light.

[0053] Preferably, the material of the base 11 is polyethylene terephthalate.

[0054] Preferably, the coating layer 12 plays the role of uniform light and preventing the light-incident surface of the substrate 11 from being scratched. Further preferably, the material of the coating layer 12 is polymethyl methacrylate.

[0055] Preferably, the optical prism 13 is any structure in Embodiment 1, and the refractive index of its material is greater than that of the base 11 .

[0056] Preferably, the plurality of optical prisms 13 are arranged in an array on the light-emitting surface of the substrate 11 . For example, when...

technical field

[0001] The invention belongs to the field of display technology, in particular to an optical prism, a prism sheet,

[0002] A backlight module and a liquid crystal display device. Background technique

[0003] A TFT liquid crystal display generally includes two parts: a display panel and a backlight module. Among them, a prism sheet is usually provided on the light emitting surface side of the light guide plate of the backlight module, which is used to converge the light and improve the brightness of the liquid crystal display in the front view direction (perpendicular to the display plane) without increasing the total luminous flux of the outgoing light. .

[0004] Among them, such as figure 1 with figure 2 As shown, the prism sheet includes a substrate 11, a coating layer 12 and an optical prism 13. The coating layer 12 is arranged on one side of the light-incident surface of the substrate 11, which can achieve uniform light and prevent the effect of s...

Examples

Embodiment 1

[0035] This embodiment provides an optical prism, and the material of the optical prism is preferably polymethyl methacrylate. The shape of the cross section of the prism is a shape composed of a triangle and a trapezoid, wherein the base of the triangle coincides with the upper base of the trapezoid.

[0036] In this example, if Figure 5 with Image 6 As shown, preferably, the triangle is an isosceles right triangle, because the angle of the vertex angle of the optical prism is 90°, it is a better choice in terms of technology and light output effect, and the more preferred isosceles triangle The vertex angle is 90°.

[0037] The trapezoid is an isosceles trapezoid, the hypotenuse of the isosceles right triangle coincides with the upper base of the isosceles trapezoid, and the base angle 136 of the isosceles trapezoid is greater than 45 degrees, and the base angle is represented by α. That is to say, the lower half of the cross-section of the optical prism is changed into...

Embodiment 2

[0052] This embodiment provides a prism sheet, such as Figure 5 with Image 6 As shown, it includes a base body 11. A plurality of optical prisms 13 provided in Embodiment 1 are provided on one side of the light-emitting surface of the base body 11. The material of the optical prisms 13 is polymethyl methacrylate, which plays the role of converging light.

[0053] Preferably, the material of the base 11 is polyethylene terephthalate.

[0054] Preferably, the coating layer 12 plays the role of uniform light and preventing the light-incident surface of the substrate 11 from being scratched. Further preferably, the material of the coating layer 12 is polymethyl methacrylate.

[0055] Preferably, the optical prism 13 is any structure in Embodiment 1, and the refractive index of its material is greater than that of the base 11 .

[0056] Preferably, the plurality of optical prisms 13 are arranged in an array on the light-emitting surface of the substrate 11 . For example, when...

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