CN101393300A - Liquid crystal display and light guide plate thereof - Google Patents

Abstract

The invention relates to a liquid crystal display and a light guide plate thereof. The light guide plate comprises an incident surface, a reflecting surface, a main light guide body and an auxiliary light guide body. The main light guide body is arranged on the reflecting surface and is provided with a first inclined surface and a second inclined surface. The auxiliary light guide body is arranged on the reflecting surface, is provided with a third inclined surface and a fourth inclined surface, and has a distance with the main light guide body. Wherein the interval is in the range of 0.2 microns and 0.5 microns, and the width of the bottom of the auxiliary light guide body on the reflecting surface is smaller than that of the bottom of the main light guide body on the reflecting surface. The liquid crystal display comprises the light guide plate; a light source disposed corresponding to the incident surface; and a liquid crystal panel disposed corresponding to the light guide plate. The invention can make the emergent light of the light guide plate concentrate in the front view angle direction of the display panel, improve the light utilization efficiency of the light guide plate, and reduce the optical films required in the backlight module, thereby saving the cost.

Description

Liquid crystal display and its light guide plate

technical field

The invention relates to a light guide plate, in particular to a light guide plate with a light guide microstructure design in a liquid crystal display.

Background technique

In liquid crystal displays, most of the light guide plates used in the prior art are produced by screen printing, laser dot placement or etching, etc., and the density of the structure in the light guide plate is designed to change the light emitted through the light guide plate, thereby adjusting The uniformity of the brightness of the outgoing light source.

However, in order to make the output angle of the output light source conform to the design of the liquid crystal display, and to consider the viewing angle characteristics of the output light source, it is generally necessary to configure three to four layers of optical films, including light diffusion sheets and brightness enhancement films, etc. Only in this way can the liquid crystal display meet the required brightness specification during operation, but it will consume relatively high material cost and assembly cost.

Contents of the invention

An object of the present invention is to provide a light guide plate, which can concentrate the emitted light through the light guide plate in a specific direction, thereby improving the brightness of the emitted light.

Another object of the present invention is to provide a liquid crystal display, which can not only improve the display brightness of the display, but also save the material cost and assembly cost of the optical film.

An embodiment of the present invention relates to a light guide plate, which includes an incident surface, a reflective surface, a main light guide body and an auxiliary light guide body. The reflective surface is connected to the incident surface. The main light guide is disposed on the reflective surface and has a first inclined surface and a second inclined surface. The auxiliary light guide is disposed on the reflective surface, has a third inclined surface and a fourth inclined surface, and has a distance from the main light guide. Wherein, the pitch ranges between 0.2 μm and 0.5 μm, and the bottom width of the auxiliary light guide on the reflective surface is smaller than the bottom width of the main light guide on the reflective surface.

Another embodiment of the present invention relates to a light guide plate, which includes an incident surface, a reflective surface, a main light guide body and an auxiliary light guide body. The reflective surface is connected to the incident surface. There is a first included angle and a second included angle between the main light guide body and the reflective surface. The auxiliary light guide is adjacent to the main light guide, and has a third included angle and a fourth included angle with the reflective surface. Wherein, the range of the height difference between the auxiliary light guide body and the main light guide body is between 1.5 micrometers (μm) and 5 micrometers (μm), and the width of the bottom of the auxiliary light guide body on the reflective surface is smaller than that of the main light guide body. Base width on reflective surfaces.

Yet another embodiment of the present invention relates to a liquid crystal display, which includes a light guide plate, a light source, an optical film, and a liquid crystal panel. The light guide plate includes an incident surface, a reflective surface and a plurality of light guide groups, wherein the reflective surface is connected to the incident surface, and the light guide groups are arranged on the reflective surface. The light source is configured corresponding to the incident surface, and the liquid crystal panel is configured corresponding to the light guide plate. Wherein, the distance between the two light guide groups in the above light guide group is between 50 microns (μm) and 500 microns (μm), and each light guide group includes a main light guide and multiple The auxiliary light guide body, and the bottom width of each auxiliary light guide body on the reflective surface is smaller than the bottom width of the main light guide body on the reflective surface.

According to the technical content of the present invention, the application of the aforementioned liquid crystal display and its light guide plate can make the outgoing light of the light guide plate more concentrated, improve the light utilization efficiency of the light guide plate, and increase the display brightness of the liquid crystal display.

Description of drawings

FIG. 1A is a combined schematic diagram of an embodiment of the liquid crystal display of the present invention.

Fig. 1B is a side view of another side of the embodiment shown in Fig. 1A.

FIG. 2 is a schematic diagram of the first embodiment of the light guide group of the present invention.

FIG. 3 is a schematic diagram of a second embodiment of the light guide group of the present invention.

FIG. 4 is a schematic diagram of a third embodiment of the light guide group of the present invention.

FIG. 5 is a schematic diagram of a fourth embodiment of the light guide group of the present invention.

FIG. 6 is a combined schematic diagram of another embodiment of the liquid crystal display of the present invention.

FIG. 7 is a schematic diagram of the light path of the liquid crystal display of the present invention.

Wherein, the reference signs are explained as follows:

100, 600: LCD display

110, 610, 710: light guide plate

112, 612: incident surface

114, 614, 714: V-shaped structure

116, 616: reflective surface

120, 620, 720: light source

130, 630: LCD panel

150, 650: light guide group

152, 152a, 152b, 152c, 152d, 652, 752: main light guide

154, 154a, 154b, 154c, 154d, 654, 754: auxiliary light guide

Detailed ways

Please refer to FIG. 1A and FIG. 1B , FIG. 1A is a combined schematic view of an embodiment of the liquid crystal display of the present invention, and FIG. 1B is a side view of another side of the embodiment shown in FIG. 1A . The liquid crystal display 100 includes a light guide plate 110 , a light source 120 and a liquid crystal panel 130 . The light guide plate 110 includes an incident surface 112 , a V-shaped structure 114 , a reflective surface 116 and a plurality of light guide groups 150 . Wherein, the V-shaped structure 114 is a light guide structure with V-shaped grooves, but the extending direction of the V-shaped grooves is perpendicular to the extending direction of the light guide group 150, so the V-shaped structure 114 cannot be observed in FIG. 1A. V-shaped cross-sectional shape, but only its rectangular side shape can be shown.

As shown in FIG. 1A , both the V-shaped structure 114 and the reflective surface 116 are connected to the incident surface 112 , and the reflective surface 116 is disposed corresponding to the V-shaped structure 114 , while the light guide group 150 is disposed on the reflective surface 116 . In a preferred embodiment, there is a distance between two adjacent groups of light guides, and the range of the distance can be between 50 micrometers (μm) and 500 micrometers (μm). In addition, the light source 120 is arranged corresponding to the incident surface 112, and the liquid crystal panel 130 is arranged corresponding to the V-shaped structure 114, so that the light source 120 can enter the light guide plate 110 through the incident surface 112, and pass through the reflective surface 116 and above. After being reflected by the light guide group 150 , it is emitted through the V-shaped structure 114 and transmitted to the liquid crystal panel 130 . Therefore, with respect to the reflection surface 116 , the side of the V-shaped structure 114 facing the liquid crystal panel 130 serves as the outgoing surface of the light guide plate 110 .

In addition, each light guide body set 150 may include a main light guide body 152 and an auxiliary light guide body 154 . The bottom width of the auxiliary light guide body 154 on the reflective surface 116 is smaller than the bottom width of the main light guide body 152 on the reflective surface 116, and there is a specific distance between the auxiliary light guide body 154 and the main light guide body 152, the specific distance Between about 0.2 microns (μm) and 0.5 microns (μm). In addition, the height of the main light guide body 152 is different from that of the auxiliary light guide body 154 , and there is a height difference between them. In one embodiment, the height of the main light guide body 152 is higher than that of the auxiliary light guide body 154; and in another embodiment, the height of the auxiliary light guide body 154 is higher than that of the main light guide body 152 , which depends on the design requirements of the product, and the present invention is not limited thereto.

As shown in FIG. 1B , the V-shaped structure 114 is a light guide structure having a V-shaped groove, and its extending direction is perpendicular to the extending direction of the light guiding body group 150 . Compared with FIG. 1A , FIG. 1B can only show the rectangular side shape of the light guide set 150 , but cannot observe the V-shaped cross-sectional shape of the light guide set 150 . In addition, since the height of the main light guide body 152 is different from that of the auxiliary light guide body 154 , there is a height difference between them, so the rectangular side shape of the light guide body set 150 will have different top ridgelines.

FIG. 2 is a schematic diagram of the first embodiment of the light guide group of the present invention. The light guide group includes a main light guide 152a and an auxiliary light guide 154a, both of which are protruding structures protruding from the reflective surface 116, and there is a distance d between them, and the range of the distance d can be between 0.2 microns ( μm) and 0.5 microns (μm). The main light guide 152a has two inclined surfaces protruding from the reflective surface 116, forming angles θ1 and θ2 with the reflective surface 116 respectively; and the auxiliary light guide 154a also has two inclined surfaces protruding from the reflective surface 116, respectively The reflective surface 116 forms an included angle θ3 and θ4. It can be seen from the figure that the main light guide body 152a and the auxiliary light guide body 154a respectively form inclined surfaces with included angles θ1, θ2, θ3 and θ4 with the reflective surface. The main light guide body 152a is closer to the light source than the auxiliary light guide body 154a, and the order of each included angle also depends on the distance between the corresponding inclined surface and the incident surface. The surface is the closest, the included angle θ2 is next, the included angle θ3 is next, and the included angle θ4 is the farthest from the incident surface. In a preferred embodiment, the included angle θ1 may range between 0.2° and 10°, the included angle θ2 may range between 30° and 50°, and the included angle θ3 may range between 70° and 110°, and the range of the included angle θ4 can be between 30° and 50°.

In addition, the main light guide body 152a has a bottom width M on the reflective surface, and the auxiliary light guide body 154a has a bottom width A on the reflective surface, and the width M is greater than the width A. In a preferred embodiment, the width M can range between 40 micrometers (μm) and 70 micrometers (μm), and the width A can range between 1 micrometer (μm) and 10 micrometers (μm) . In addition, the main light guide body 152a has a height h1, and the auxiliary light guide body 154a has a height h2, and the height difference between the two can range between 1.5 micrometers (μm) and 5 micrometers (μm).

FIG. 3 is a schematic diagram of a second embodiment of the light guide group of the present invention. 2, the main light guide body 152b and the auxiliary light guide body 154b are concave structures recessed into the reflective surface 116, and there is also a distance d between them, which can range from 0.2 microns (μm) and 0.5 microns (μm). The two concave inclined surfaces of the main light guide 152b respectively form angles θ1 and θ2 with the reflective surface, while the two concave inclined surfaces of the auxiliary light guide 154b respectively form included angles θ3 and θ4 with the reflective surface. It can be seen from the figure that the auxiliary light guide body 154b and the main light guide body 152b form inclined surfaces with included angles θ3, θ4, θ1 and θ2 with the reflective surface. The auxiliary light guide body 154b is closer to the light source than the main light guide body 152b, and the sequence of each included angle also depends on the distance between the corresponding inclined surface and the incident surface. The surface is the closest, the included angle θ4 is next, the included angle θ1 is next, and the included angle θ2 is the farthest from the incident surface. In a preferred embodiment, the included angle θ1 may range between 30° and 50°, the included angle θ2 may range between 70° and 110°, and the included angle θ3 may range between 30° and 50°, and the range of the included angle θ4 may be between 0.2° and 10°.

In addition, the bottom width M of the main light guide body 152b on the reflective surface is also larger than the bottom width A of the auxiliary light guide body 154b on the reflective surface, and the width M can range between 40 micrometers (μm) and 70 micrometers (μm) Between, the width A may range between 1 micrometer (μm) and 10 micrometers (μm). In addition, there is also a height difference between the height h1 of the main light guide body 152b and the height h2 of the auxiliary light guide body 154b, and the range of the height difference is between 1.5 micrometers (μm) and 5 micrometers (μm).

FIG. 4 is a schematic diagram of a third embodiment of the light guide group of the present invention. 2, the main light guide body 152c is a protruding structure protruding from the reflective surface 116, while the auxiliary light guide body 154c is a concave structure recessed into the reflective surface 116, and there is also a distance between them d, which may range between 0.2 micrometer (μm) and 0.5 micrometer (μm). The two convex inclined surfaces of the main light guide 152c form angles θ1 and θ2 with the reflective surface respectively, while the two concave inclined surfaces of the auxiliary light guide 154c form included angles θ3 and θ4 with the reflective surface respectively. It can be seen from the figure that the main light guide body 152c and the auxiliary light guide body 154c form inclined surfaces with included angles θ1, θ2, θ3 and θ4 with the reflective surface. The main light guide body 152c is closer to the light source than the auxiliary light guide body 154c, and the order of each included angle also depends on the distance between the corresponding inclined surface and the incident surface. The surface is the closest, the included angle θ2 is next, the included angle θ3 is next, and the included angle θ4 is the farthest from the incident surface.

In addition, the bottom width M of the main light guide body 152c on the reflective surface is also larger than the bottom width A of the auxiliary light guide body 154c on the reflective surface, and the width M can range between 40 micrometers (μm) and 70 micrometers (μm) Between, the width A may range between 1 micrometer (μm) and 10 micrometers (μm). In addition, there is also a height difference between the height h1 of the main light guide body 152c and the height h2 of the auxiliary light guide body 154c, and the range of the height difference is between 1.5 micrometers (μm) and 5 micrometers (μm). In this embodiment, since the main light guide body 152c is a convex structure, and the auxiliary light guide body 154c is a concave structure, the height difference is specifically defined as the absolute value of the difference between the height h1 and the height h2, and the height h1 and The height h2 is all positive numbers.

FIG. 5 is a schematic diagram of a fourth embodiment of the light guide group of the present invention. Compared with FIG. 4 , the main light guide 152d is a concave structure that is recessed into the reflective surface, while the auxiliary light guide 154d is a convex structure that protrudes from the reflective surface, and there is also a distance d between them, Its range is approximately between 0.2 micrometer (μm) and 0.5 micrometer (μm). The two concave inclined surfaces of the main light guide 152d form angles θ1 and θ2 with the reflective surface respectively, while the two convex inclined surfaces of the auxiliary light guide 154d form angles θ3 and θ4 with the reflective surface respectively. It can be seen from the figure that the auxiliary light guide body 154d and the main light guide body 152d form inclined surfaces with included angles θ3, θ4, θ1 and θ2 with the reflective surface. The auxiliary light guide body 154d is closer to the light source than the main light guide body 152d, and the order of each included angle also depends on the distance between the corresponding inclined surface and the incident surface. The surface is the closest, the included angle θ4 is next, the included angle θ1 is next, and the included angle θ2 is the farthest from the incident surface.

In addition, the bottom width M of the main light guide body 152d on the reflective surface is also larger than the bottom width A of the auxiliary light guide body 154d on the reflective surface, and the width M can range between 40 micrometers (μm) and 70 micrometers (μm) Between, the width A may range between 1 micrometer (μm) and 10 micrometers (μm). In addition, there is also a height difference between the height h1 of the main light guide body 152d and the height h2 of the auxiliary light guide body 154d, and the range of the height difference is between 1.5 micrometers (μm) and 5 micrometers (μm). In this embodiment, since the main light guide body 152d is a concave structure, and the auxiliary light guide body 154d is a convex structure, the height difference is specifically defined as the absolute value of the difference between the height h1 and the height h2, and the height h1 and height h2 are both positive numbers.

FIG. 6 is a schematic diagram of another embodiment of the liquid crystal display of the present invention. The liquid crystal display 600 also includes a light guide plate 610, a light source 620, an optical film (not shown in the figure) and a liquid crystal panel 630, wherein the incident surface 612 of the light guide plate 610, the V-shaped structure 614, the reflective surface 616 and a plurality of light guide bodies The configuration of the group 650 is similar to the embodiment shown in FIG. 1A , and there is a separation distance between the two light guide groups in the light guide group, which can be between 50 micrometers (μm) and 500 micrometers ( μm). 1A, each light guide body group 650 may include a main light guide body 652 and a plurality of auxiliary light guide bodies 654, wherein the bottom width of each auxiliary light guide body 654 on the reflective surface 616 is less than The bottom width of the main light guide 652 on the reflective surface 616 . In a preferred embodiment, the width of the bottom of the main light guide 652 can range between 40 micrometers (μm) and 70 micrometers (μm), while the width of the bottom of the auxiliary light guide 654 can range between Between 1 micron (μm) and 10 microns (μm). In addition, there is a distance between the main light guide body 652 and its adjacent auxiliary light guide body 654, which can be between 0.2 microns (μm) and 0.5 microns (μm), and two adjacent auxiliary light guide bodies 654 There is also a distance between them, which can also be between 0.2 micrometer (μm) and 0.5 micrometer (μm).

In addition, the height of the main light guide body 652 is different from that of the auxiliary light guide body 654, and there is a height difference between them, and the main light guide body 652 and the auxiliary light guide body 654 can be designed to protrude from the reflective surface 616 respectively. The convex structure, or the concave structure of the concave reflection surface 616, and the height of the main light guide body 652 can be designed to be higher or lower than the height of the auxiliary light guide body 654 according to actual design requirements. In a preferred embodiment, the range of the height difference between the two is between 1.5 micrometers (μm) and 5 micrometers (μm).

In addition, the angles, heights or even numbers formed by the light guides in the above-mentioned embodiments can vary with the incident distance of the light source into the light guide plate.

FIG. 7 is a schematic diagram of the light path of the liquid crystal display of the present invention. Here, the configuration of the main light guide body closer to the light source than the auxiliary light guide body and both of them are protruding structures are taken as an example for illustration. As shown in the figure, when the light source 720 is incident on the light guide plate 710, part of the light source 720 will be emitted through the V-shaped structure 714 according to the reflection of the main light guide body 752, but part of the light source 720 will still leak out from the main light guide body 752 . At this time, the leaked light source 720 is incident on the auxiliary light guide body 754 again, and is reflected by the auxiliary light guide body 754 again to be emitted through the V-shaped structure 714 . That is, the main directed outgoing light includes light reflected by the main light guide body 752 and light reflected by the auxiliary light guide body 754 . In this way, the leakage of the light source 720 can be reduced, and the utilization efficiency of the light source 720 can be greatly improved.

From the above-mentioned embodiments of the present invention, it can be known that the application of the above-mentioned liquid crystal display and its light guide plate can concentrate the outgoing light of the light guide plate in the direction of the normal viewing angle of the display panel, thereby reducing the situation of light leakage, improving the light utilization efficiency of the light guide plate, and Increases the display brightness of the monitor. Not only that, with the improvement of light utilization efficiency, the required optical films (such as: brightness enhancement film, etc.) in the backlight module can also be reduced, thereby greatly saving the cost of the optical film and the assembly cost of the backlight module.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Any person skilled in the art to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection defined by the appended claims.

Claims (16)

1. light guide plate comprises:

One plane of incidence;

One reflecting surface is connected in this plane of incidence;

One main light conductor is disposed on this reflecting surface, and has one first inclined surface and one second inclined surface; And

One auxiliary light conductor is disposed on this reflecting surface, and has one the 3rd inclined surface and one the 4th inclined surface, has a spacing between this auxiliary light conductor and this main light conductor;

Wherein, the scope of this spacing between 0.2 micron and 0.5 micron, this auxiliary light conductor the bottom width on this reflecting surface less than this bottom width of main light conductor on this reflecting surface.

2. light guide plate comprises:

One plane of incidence;

One reflecting surface is connected in this plane of incidence;

One main light conductor, and accompany one first angle and one second angle between this reflecting surface; And

One auxiliary light conductor is adjacent to this main light conductor, and and this reflecting surface between accompany one the 3rd angle and one the 4th angle;

Wherein, the scope of the difference in height of this auxiliary light conductor and this main light conductor between 1.5 microns and 5 microns, and should auxiliary light conductor the bottom width on this reflecting surface less than this bottom width of main light conductor on this reflecting surface.

3. light guide plate as claimed in claim 2, wherein should auxiliary light conductor in the scope of the bottom width on this reflecting surface between 1 micron and 10 microns, this main light conductor in the scope of the bottom width on this reflecting surface between 40 microns and 70 microns.

4. light guide plate as claimed in claim 2, wherein this main light conductor be the projective structure that protrudes this reflecting surface with assisting light conductor, and this first angle, this second angle, the 3rd angle and the 4th angle are in regular turn away from this plane of incidence.

5. light guide plate as claimed in claim 4, wherein the scope of this first angle is between 0.2 ° and 10 °, and the scope of this second angle is between 30 ° and 50 °.

6. light guide plate as claimed in claim 4, wherein the scope of the 3rd angle is between 70 ° and 110 °, and the scope of the 4th angle is between 30 ° and 50 °.

7. light guide plate as claimed in claim 2, wherein this main light conductor and this auxiliary light conductor be the recessed structure of recessed this reflecting surface, and the 3rd angle, the 4th angle, this first angle and this second angle are in regular turn away from this plane of incidence.

8. light guide plate as claimed in claim 7, wherein the scope of this first angle is between 30 ° and 50 °, and the scope of this second angle is between 70 ° and 110 °.

9. light guide plate as claimed in claim 7, wherein the scope of the 3rd angle is between 30 ° and 50 °, and the scope of the 4th angle is between 0.2 ° and 10 °.

10. LCD comprises:

One light guide plate comprises a plane of incidence, a reflecting surface and a plurality of light conductor group, and wherein this reflecting surface is connected in this plane of incidence, and described light conductor assembly places on this reflecting surface;

One light source is corresponding to this plane of incidence configuration; And

One liquid crystal panel is corresponding to this light guide plate configuration;

Wherein, spacing distance in the described light conductor group between the two light conductor groups is between 50 microns and 500 microns, each described light conductor group all comprises a main light conductor and an a plurality of auxiliary light conductor, and each described auxiliary light conductor at the bottom width on this reflecting surface the bottom width of main light conductor on this reflecting surface all less than this.

11. LCD as claimed in claim 10 wherein has one first spacing between this main light conductor and the adjacent one auxiliary light conductor, the scope of this first spacing is between 0.2 micron and 0.5 micron.

12. LCD as claimed in claim 10 has one second spacing between the two adjacent auxiliary light conductors in the wherein said auxiliary light conductor, the scope of this second spacing is between 0.2 micron and 0.5 micron.

13. LCD as claimed in claim 10, wherein this main light conductor is projective structure that protrudes this reflecting surface or the recessed structure that is recessed into this reflecting surface.

14. LCD as claimed in claim 10 wherein should be projective structure that protrudes this reflecting surface or the recessed structure that is recessed into this reflecting surface by auxiliary light conductor.

15. LCD as claimed in claim 10, wherein each described auxiliary light conductor in the scope of the bottom width on this reflecting surface between 1 micron and 10 microns.

16. LCD as claimed in claim 10, wherein this main light conductor in the scope of the bottom width on this reflecting surface between 40 microns and 70 microns.

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