Light guide plate for improving backlight ray utilization rate of liquid crystal module

Abstract

The utility model discloses a light guide plate capable of improving the backlight ray utilization rate of a liquid crystal module, which relates to the technical field of liquid crystal display and comprises a light guide plate main body for transmitting light rays in a total reflection manner and lattice points for breaking the total reflection of the light rays in the light guide plate main body, and the lattice points are positioned on the bottom surface of the light guide plate main body. The distribution area of the lattice points on the bottom face of the light guide plate body is smaller than the corresponding liquid crystal panel display area, and the refractive index of the light guide plate body is larger than the air refractive index. The light guide plate can utilize light outside a liquid crystal panel display area of a conventional liquid crystal module, the brightness of the liquid crystal module is improved, and the backlight optical utilization rate of the liquid crystal module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, and in particular to a light guide plate for improving the utilization rate of backlight of a liquid crystal module. Background Art

[0002] The backlight system of the LCD module includes backlight strips and optical film materials. There are two ways of light entry for backlight strips: side-entry and direct-down. The optical film materials corresponding to different light entry methods of backlight strips are slightly different, mainly reflected in the use of light guide plates or diffusers. The side-entry backlight strips use light guide plates, and the direct-down backlight strips use diffusers.

[0003] The light guide plate can guide and change the direction of light, that is, convert the light from the side-entry backlight bar horizontally incident into the light guide plate into vertically emitted light. This light guiding function mainly utilizes the law of refraction and total reflection of light. When light is incident from a material with a high refractive index to a material with a low refractive index, when the incident angle exceeds the critical angle, no refraction will occur, only total reflection will occur. Adding dots to the bottom of the light guide plate destroys the total reflection of the light, changes the refraction direction of the light and transmits out of the light guide plate. In addition to the light-incoming side, the light guide plate can add side edge reflection strips on other sides to reflect the light that does not transmit out of the light guide plate but reaches the side edge of the light guide plate back into the light guide plate, thereby realizing the utilization of light.

[0004] In the prior art, Chinese Patent Publication No.: CN104832885A, Publication Date: August 12, 2015, discloses a liquid crystal display, a light guide plate and a backlight module, a light guide plate, characterized in that the light guide plate includes an incident light guiding portion, a light emitting portion and a connecting portion; the connecting portion connects the incident light guiding portion and the light emitting portion, the incident light guiding portion and the light emitting portion are parallel, the incident light guiding portion and the light emitting portion of the light guide plate are located on one side of the bending direction of the connecting portion, so that the side surface of the light guide plate presents a folded structure; the outer side surface of the light emitting portion is provided with a light emitting surface; the light emitting surface presents a dot-shaped structure.

[0005] However, the above prior art has obvious shortcomings:

[0006] 1. The distribution range of dots at the bottom of the light guide plate is generally larger than the display area of ​​the liquid crystal panel. The light transmitted from the light guide plate and outside the display area of ​​the liquid crystal panel will not pass through the liquid crystal panel. The light in this area is not utilized, resulting in light waste. Summary of the invention

[0007] The purpose of the utility model is to overcome the above problems existing in the existing light guide plate, and to provide a light guide plate for improving the utilization rate of the backlight of the liquid crystal module, thereby improving the utilization rate of the backlight of the liquid crystal module without increasing the cost of the light guide plate.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0009] A light guide plate for improving the utilization rate of backlight of a liquid crystal module, characterized in that it includes a light guide plate body for causing light to be fully reflected and propagated, and mesh points for destroying the total reflection of light in the light guide plate body, wherein the mesh points are located on the bottom surface of the light guide plate body, the distribution area of ​​the mesh points on the bottom surface of the light guide plate is smaller than the corresponding display area of ​​the liquid crystal panel, and the refractive index of the light guide plate body is greater than the refractive index of air.

[0010] A reflective sheet is also arranged at the bottom of the light guide plate body, and the grid points are located between the bottom surface of the light guide plate body and the reflective sheet.

[0011] The reflective sheet is used to reflect the light transmitted from the bottom of the light guide plate into the light guide plate.

[0012] The side surface of the light guide plate body corresponding to the light incident side surface is a non-light incident side surface, and a side edge reflection strip is arranged on the non-light incident side surface.

[0013] The side edge reflection strip is used to guide the light entering the interior of the light guide plate from the light incident side to the non-light incident side and then reflect it back into the interior of the light guide plate.

[0014] The optical film is used to adjust the direction of light to be nearly perpendicular to the liquid crystal panel.

[0015] The overlapping area corresponding to the display area of ​​the liquid crystal panel on the light guide plate body forms a light emitting area of ​​the light guide plate.

[0016] The portion of the bottom surface of the light guide plate body corresponding to the area formed by 2 to 3 mm from the edge of the light emitting area of ​​the light guide plate forms a light guide plate grid point distribution area, and the grid points are arranged in the light guide plate grid point distribution area.

[0017] The dots are evenly distributed in the dot distribution area of ​​the light guide plate.

[0018] The advantages of adopting the utility model are:

[0019] 1. By adjusting the dot distribution of the light guide plate on the basis of the conventional light guide plate, the liquid crystal panel of the conventional liquid crystal module can utilize the light outside the display area, thereby improving the brightness of the liquid crystal module and the optical utilization rate of the liquid crystal module backlight.

[0020] Second, since only the dot distribution of the light guide plate is adjusted, the manufacturing cost of the light guide plate will not increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of light guiding of the light guide plate of the utility model;

[0022] Figure 2 It is a schematic diagram of each area of ​​the light guide plate and liquid crystal panel of the utility model.

[0023] The markings in the figure are: 1. Light guide plate body, 2. Dots, 3. LCD panel display area, 4. Reflector, 5. Light incident side, 6. Side edge reflection strip, 7. LCD panel, 8. Optical film, 9. Light guide plate light exit area, 10. Light guide plate dot distribution area. DETAILED DESCRIPTION

[0024] Example 1

[0025] This embodiment further illustrates the structure and principle of the utility model in conjunction with the accompanying drawings:

[0026] A light guide plate for improving the utilization rate of backlight of a liquid crystal module comprises a light guide plate body for making the light propagate through total reflection and mesh points for destroying the total reflection of the light in the light guide plate body, wherein the mesh points are located on the bottom surface of the light guide plate body, the distribution area of ​​the mesh points on the bottom surface of the light guide plate body is smaller than the corresponding display area of ​​the liquid crystal panel, and the refractive index of the light guide plate body is greater than the refractive index of air.

[0027] A reflective sheet is also arranged at the bottom of the light guide plate body, and the grid points are located between the bottom surface of the light guide plate body and the reflective sheet.

[0028] The reflective sheet is used to reflect the light transmitted from the bottom of the light guide plate body into the light guide plate.

[0029] The side surface of the light guide plate body corresponding to the light incident side surface is a non-light incident side surface, and a side edge reflection strip is arranged on the non-light incident side surface.

[0030] The side edge reflection strip is used to guide the light entering the interior of the light guide plate from the light incident side to the non-light incident side and then reflect it back into the interior of the light guide plate.

[0031] The optical film is used to adjust the direction of light to be nearly perpendicular to the liquid crystal panel.

[0032] The overlapping area corresponding to the display area of ​​the liquid crystal panel on the light guide plate body forms a light emitting area of ​​the light guide plate.

[0033] Example 2

[0034] like Figure 1 As shown, the light emitted by the light source on the light incident side 5 enters the interior of the light guide plate body 1 at a certain angle and meets the full side edge reflection condition, and the light will not be transmitted from the light exiting surface and the bottom of the light guide plate body 1. The addition of the dots 2 on the bottom surface of the light guide plate body 1 destroys the total reflection of the light inside the light guide plate, and the light is transmitted from the light exiting surface and the bottom of the light guide plate. The light transmitted from the bottom of the light guide plate enters the light guide plate again after being reflected by the reflective sheet 4, and then transmits from the light exiting surface of the light guide plate to the upper liquid crystal panel display area 3; the light propagating to the non-light incident side passes through the side edge reflective strip 6 and enters the interior of the light guide plate again.

[0035] like Figure 2 As shown, the dot distribution area 10 at the bottom of the light guide plate is smaller than the corresponding liquid crystal panel display area 3. The specific method for determining the dot distribution area 10 at the bottom of the light guide plate is as follows:

[0036] 1. Determine the size of the light guide plate body 1 according to the structural backplane of the liquid crystal module, the matching middle frame size and the outer size of the liquid crystal panel.

[0037] 2. Determine the display area size of the LCD panel according to the LCD panel specifications of the LCD module.

[0038] 3. According to the placement and stacking method of the light guide plate and the liquid crystal panel of the liquid crystal module, the corresponding overlapping area of ​​the liquid crystal panel display area 3 on the light guide plate is determined, and the area is defined as the light guide plate light emitting area 9.

[0039] 4. Add dots 2 at the bottom of the light guide plate light emitting area 9. The dots are distributed in an area of ​​about 2-3 mm within the light guide plate light emitting area 10, and are not distributed on the edge of the light guide plate light emitting area 10. This area is defined as the light guide plate dot distribution area 10; the light guide plate dot distribution area 10 is slightly smaller than the light guide plate light emitting area 9.

[0040] The light transmitted from the light guide plate is not perpendicular to the light emitting surface of the light guide plate, and there is a certain angle between the light and the light emitting surface of the light guide plate. After passing through the upper optical film of the light guide plate, the direction of the light is close to perpendicular to the light emitting surface of the light guide plate, that is, the angle between the direction of the light and the light emitting surface of the light guide plate becomes larger, close to 90°, so that the light emitted by the light source into the light guide plate can be transmitted through the light guide plate and the optical film, enter the display area of ​​the liquid crystal panel, and can reach the edge of the display area of ​​the liquid crystal display panel, so that there will be light at the edge of the display area after the liquid crystal display panel is lit, and the edge of the liquid crystal panel will not be dark.

[0041] The above description is only an embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the principle and spirit of the utility model shall be included in the protection scope of the utility model.

Claims

1. A light guide plate for improving the utilization rate of backlight of a liquid crystal module, characterized in that: The invention comprises a light guide plate body (1) for causing total reflection and propagation of light, and mesh points (2) for destroying total reflection of light in the light guide plate body, wherein the mesh points (2) are located on the bottom surface of the light guide plate body (1), the distribution area of ​​the mesh points (2) on the bottom surface of the light guide plate body (1) is smaller than the corresponding liquid crystal panel display area (3), and the refractive index of the light guide plate body (1) is greater than the refractive index of air.

2. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 1, characterized in that: A reflective sheet (4) is also provided at the bottom of the light guide plate body (1), and the grid points (2) are located between the bottom surface of the light guide plate body (1) and the reflective sheet (4).

3. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 2, characterized in that: The reflective sheet (4) is used to reflect light transmitted through the bottom of the light guide plate body (1) into the light guide plate.

4. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 1, characterized in that: The side surface of the light guide plate body (1) corresponding to the light incident side surface (5) is a non-light incident side surface, and a side edge reflection strip (6) is provided on the non-light incident side surface.

5. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 4, characterized in that: The side edge reflection strip (6) is used to guide the light incident from the light incident side into the interior of the light guide plate to the non-light incident side and then reflect it back into the interior of the light guide plate.

6. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 1, characterized in that: The upper layer of the light guide plate body (1) is provided with an optical film (8), and the optical film (8) is used to adjust the direction of light to be nearly perpendicular to the liquid crystal panel (7).

7. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 1, characterized in that: The corresponding overlapping area of ​​the liquid crystal panel display area (3) on the light guide plate body (1) forms a light guide plate light output area (9).

8. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 5, characterized in that: The portion of the bottom surface of the light guide plate body (1) corresponding to the area formed 2 to 3 mm from the edge of the light guide plate light exit area (9) forms a light guide plate grid point distribution area (10), and the grid points (2) are arranged in the light guide plate grid point distribution area (10).

9. The light guide plate for improving the backlight utilization rate of a liquid crystal module according to claim 2, characterized in that: The mesh dots (2) are evenly distributed in the light guide plate mesh dot distribution area (10).

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