Backlight and display device

Abstract

To enable local dimming.SOLUTION: A backlight 12 is divided into a plurality of groups G, and each of the plurality of groups G includes a group of lasers 32R, 32G, 32B, 32R'. The group of lasers 32R, 32G, 32B, 32R' includes two or more lasers 32R, 32G, 32B. The two or more lasers 32R, 32G, 32B have a plurality of lasers differing from each other in light color, and a plurality of light-guiding blocks 22 which are separated from each other, each of which has an incident surface 30 onto which light can be incident from each of a corresponding group of lasers 32R, 32G, 32B, 32R' of the plurality of groups G, and each of which has an emission surface 28 from which light can exit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a backlight and a display device. [Background technology]

[0002] A backlight used in a display device has a light source and a light guide plate, and the light guide plate is designed so that the entire light-emitting surface thereof is illuminated uniformly (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2021-514488 Summary of the Invention [Problem to be solved by the invention]

[0004] Contrast can be improved by local dimming, which adjusts the brightness of the backlight for each area according to the light and dark areas displayed on the screen. However, a light guide plate, which illuminates evenly across its entire light-emitting surface, cannot achieve local dimming.

[0005] The present invention aims to enable local dimming. [Means for solving the problem]

[0006] The backlight is divided into a plurality of groups, each of which includes a group of lasers, the group of lasers including two or more lasers, the two or more lasers being different from each other in light color, and a plurality of light guide blocks which are separated from each other, each of which has an entrance surface onto which the light from each of the groups of lasers corresponding to one of the plurality of groups can enter, and each of which has an exit surface from which the light can exit.

[0007] The display device includes the backlight and a display panel into which the light emitted from the emission surface is incident from the rear surface. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a display device according to an embodiment. [Diagram 2] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the present invention can be embodied in various forms without departing from the spirit of the present invention, and the present invention should not be interpreted as being limited to the description of the embodiment exemplified below.

[0010] In order to clarify the description, the drawings may show the width, thickness, shape, etc. of each part in a schematic manner compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each drawing, elements having the same functions as those explained in the previous drawings may be given the same reference numerals, and duplicate explanations may be omitted.

[0011] Furthermore, in the detailed description of the present invention, when defining the positional relationship between a certain component and another component, "above" and "below" do not only mean a component being located directly above or below another component, but also include a component being located between the other components, unless otherwise specified.

[0012] 1 is a cross-sectional view of a display device according to an embodiment. The display device has a display panel 10. The display panel 10 is a non-emitting panel such as a liquid crystal display panel, and requires illumination, so the display device has a backlight 12. Light from the backlight 12 is incident on the back surface of the display panel 10 to display an image. An upper prism 14, a lower prism 16, a diffusion sheet 18, and a diffusion plate 20 are overlapped between the display panel 10 and the backlight 12 to make the light uniform.

[0013] 2 is a bottom view of the backlight 12. The backlight 12 has a plurality of light guide blocks 22. The light guide blocks 22 are separated from each other. Therefore, light (different in color) does not mix inside adjacent light guide blocks 22. Each light guide block 22 has an inverted truncated pyramid shape and includes a bottom surface 24 and a top surface 26 that are opposite to each other. The top surface 26 is larger than the bottom surface 24.

[0014] Each light guide block 22 has an exit surface 28 from which light can exit. Top surface 26 is exit surface 28. Light is emitted in a planar manner from exit surface 28. The light emitted from exit surface 28 is incident on the rear surface of display panel 10. Each light guide block 22 has an entrance surface 30 into which light can enter. Bottom surface 24 is the entrance surface 30.

[0015] The backlight 12 has a plurality of lasers. Lasers differ from light-emitting diodes in that they have a resonator structure and emit light in the form of a narrow beam. The plurality of lasers are divided into a plurality of groups G. Each of the plurality of groups G includes a group of lasers 32R, 32G, 32B, and 32R'. Light can be incident on the incident surface 30 of each light-guiding block 22 from a group of lasers 32R, 32G, 32B, and 32R' included in a corresponding one of the plurality of groups G.

[0016] The group of lasers 32R, 32G, 32B, 32R' includes two or more lasers 32R, 32G, 32B. The two or more lasers 32R, 32G, 32B are different from each other in light color. The colors are, for example, red, green, and blue. The group of lasers 32R, 32G, 32B, 32R' includes at least one laser 32R' that is the same in light color as one of the two or more lasers 32R, 32G, 32B. The light of one of the two or more lasers 32R, 32G, 32B (laser 32R) and the at least one laser 32R' is red. The interval D between one of the two or more lasers 32R, 32G, 32B (laser 32R) and the at least one laser 32R' is larger than the interval d between the other adjacent lasers. The two or more lasers 32R, 32G, 32B are arranged at equal intervals from each other.

[0017] In this embodiment, multiple lasers are used, but the multiple light guiding blocks 22 are separated from one another, making local dimming possible.

[0018] [Overview of the embodiment] (1) A backlight 12 having a plurality of groups G, each of which includes a group of lasers 32R, 32G, 32B, 32R', each of which includes two or more lasers 32R, 32G, 32B, each of which includes a plurality of lasers differing from each other in light color, and a plurality of light guide blocks 22 which are separated from each other, each of which has an entrance surface 30 onto which light can be incident from each of a corresponding group of lasers 32R, 32G, 32B, 32R' of the plurality of groups G, and each of which has an exit surface 28 from which light can exit. Since the multiple light guide blocks 22 are separated from one another, local dimming is possible even though multiple lasers are used. (2) In the backlight 12 described in (1), the group of lasers 32R, 32G, 32B, 32R' includes two or more lasers 32R, 32G, 32B and at least one laser 32R' that is the same in light color as one of the two or more lasers 32R, 32G, 32B. (3) The backlight 12 described in (2), in which the light of one of the two or more lasers 32R, 32G, 32B and the light of the at least one laser 32R' is red. (4) The backlight 12 according to (2) or (3), wherein the distance D between one of the two or more lasers 32R, 32G, 32B and the at least one laser 32R' is greater than the distance d between the other adjacent lasers. (5) The backlight 12 according to any one of (1) to (4), wherein the two or more lasers 32R, 32G, and 32B are arranged at equal intervals from each other. (6) A backlight 12 according to any one of (1) to (5), wherein each of a plurality of light-guiding blocks 22 includes a bottom surface 24 and a top surface 26 opposite each other, the incident surface 30 is the bottom surface 24, the exit surface 28 is the top surface 26, and the top surface 26 is larger than the bottom surface 24. (7) The backlight 12 according to (6), wherein each of the plurality of light guide blocks 22 has an inverted pyramid shape. (8) A display device having a backlight 12 according to any one of (1) to (7) and a display panel 10 in which light emitted from an exit surface 28 is incident on the rear surface.

[0019] The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the configurations described in the embodiments can be replaced with substantially the same configurations, configurations that provide the same effects, or configurations that can achieve the same purpose. [Explanation of symbols]

[0020] 10 display panel, 12 backlight, 14 upper prism, 16 lower prism, 18 diffusion sheet, 20 diffusion plate, 22 light guide block, 24 bottom surface, 26 top surface, 28 exit surface, 30 entrance surface, 32R laser, 32R´ laser, 32G laser, 32B laser, D spacing, d spacing, G group.

Claims

1. a plurality of lasers divided into a plurality of groups, each of the plurality of groups including a group of lasers, the group of lasers including two or more lasers, the two or more lasers being different from each other in color of light; a plurality of light guide blocks separated from each other, each having an entrance surface onto which the light from each of the groups of lasers corresponding to the plurality of groups can be incident, and each having an exit surface from which the light can be exited; Having a backlight.

2. 2. The backlight according to claim 1, The group of lasers includes the two or more lasers and at least one laser that is the same in the color of the light as one of the two or more lasers.

3. 3. The backlight according to claim 2, A backlight, wherein said one of said two or more lasers and said light of said at least one laser is red.

4. 3. The backlight according to claim 2, A backlight, wherein the spacing between the one of the two or more lasers and the at least one laser is greater than the spacing between other adjacent lasers.

5. 2. The backlight according to claim 1, A backlight, wherein the two or more lasers are arranged at equal intervals from each other.

6. 2. The backlight according to claim 1, Each of the plurality of light guiding blocks includes opposed bottom and top surfaces; the entrance surface is the bottom surface and the exit surface is the top surface; A backlight having a top surface larger than a bottom surface.

7. 7. The backlight according to claim 6, A backlight, in which each of the plurality of light guiding blocks has an inverted pyramid shape.

8. A backlight according to any one of claims 1 to 7; a display panel in which the light emitted from the exit surface is incident on a rear surface of the display panel; A display device having the above configuration.

Images