WO2017152613A1

WO2017152613A1 - Backlight device and control method therefor

Info

Publication number: WO2017152613A1
Application number: PCT/CN2016/099174
Authority: WO
Inventors: 宁超; 曹谦; 苏文华; 姚键; 潘柏宇; 王冀
Original assignee: 合一智能科技（深圳）有限公司
Priority date: 2016-03-07
Filing date: 2016-09-18
Publication date: 2017-09-14
Also published as: CN105736963A

Abstract

A backlight device and a control method therefor. The backlight device comprises: a light source component (2), an optical coupling component (1), optical fibers (3), and point light sources (4). The optical fibers (3) are located near edges of the optical coupling component (1). Light from the point light sources (4) can irradiate the tail end of each optical fiber (3), part of the light being emitted from side walls of the optical fibers (3). The light emitted from the light source component (2) and the side walls of the optical fibers (3) are converted into planar light by means of the optical coupling component (1). By disposing the optical fibers (3), whose side walls can emit light, near the edges of the optical coupling component (1), and irradiating the optical coupling component (1) by using the point light sources (4) for light emission, the optical fibers (3) and the light source component (2) are combined to provide a backlight source for the backlight device. In this way, the capability of adjusting the illumination to the edges of the optical coupling component (1) is enhanced, so that the backlight device can flexibly control the display brightness of edges of a screen according to requirements.

Description

Backlight device and control method thereof

cross reference

The present application claims priority to Chinese Patent Application No. 201610128236.2, filed on Mar.

Technical field

The present invention relates to the field of display devices, and in particular, to a backlight device and a control method thereof.

Background technique

There are two main types of backlights for existing television sets: direct-lit backlights and side-lit backlights. The direct type backlight device converts the point light source at the bottom of the screen into a surface light source, and the side-in type backlight device converts the line light source on the side of the screen into a surface light source. For a direct type backlight device, the brightness of the periphery of the screen is generally dark. For a side-lit backlight device, the brightness of the edge of the screen where the line source is not normally placed is relatively dark. In some cases, the darkness of the edge of the screen affects the display, so you need to increase the display brightness. In some other cases, you may want the edge of the screen to be darker, so you need to reduce the display brightness. However, the backlight device of the prior art does not flexibly control the display brightness of the edge of the screen as needed.

Summary of the invention

technical problem

In view of this, the present invention provides a backlight device and a control method thereof, which can control the display brightness of the edge of the screen according to the need for display brightness in different situations.

solution

In one aspect, a backlight device is provided, wherein the backlight device comprises: a light source a component, an optical coupling component, an optical fiber, and a point source, the fiber being located adjacent an edge of the optical coupling component; the light of the point source being capable of illuminating an end of the fiber, a portion of the light passing through a side of the fiber The wall emits light; the light emitted by the light source assembly and the sidewall of the fiber is converted into planar light via the light coupling assembly.

In a possible implementation, the light source component is located on one side or opposite sides of the light coupling component, and the optical fiber is disposed on at least one of the light coupling component except the side of the light source component. Near the edge of the side.

In a possible implementation, the light source assembly is located below the light coupling assembly, and the optical fiber is disposed adjacent at least one of the four edges of the light coupling assembly.

In a possible implementation, the optical fiber includes a first fiber portion and a second fiber portion, and light of the point source is irradiated to an end of the first fiber portion and transmitted to the second fiber via the first fiber portion In part, a portion of the light transmitted to the second fiber portion is emitted outside the fiber via the sidewall of the second fiber portion.

In a possible implementation, one end of each of the optical fibers is provided with one of the point sources.

In a possible implementation manner, the illumination parameters of each point source can be independently adjusted.

In a possible implementation, the second fiber portion is a side optical fiber.

On the other hand, a control method of a backlight device for controlling the backlight device is proposed. The control method includes: illuminating the point light source to illuminate a corresponding optical fiber when it is required to increase edge display brightness Therefore, the display brightness of the edge where the corresponding fiber is located is increased.

In a possible implementation manner, the control method further includes: turning off the point light source to make the corresponding optical fiber not emit light when the edge display brightness needs to be reduced, so that the display brightness of the edge where the corresponding optical fiber is located is decreased.

In a possible implementation manner, the control method further includes: controlling the point light source to cause an optical fiber at an edge near the first region in the display screen to emit light, and the optical fiber at an edge near the second region No light is emitted, wherein the display brightness of the first area is higher than the display brightness of the second area.

Beneficial effect

The optical fiber is disposed near the edge of the optical coupling component and is illuminated by the point light source. The optical fiber is combined with the light source component to provide a backlight source for the backlight device, thereby enhancing the light. The illumination adjustment capability of the edge of the coupling component is such that the backlight device according to an embodiment of the present invention can flexibly control the display brightness of the edge of the screen as needed.

Further features and aspects of the present invention will become apparent from the Detailed Description of the Drawing.

DRAWINGS

The accompanying drawings, which are incorporated in FIG

FIG. 1 shows a front view of a backlight device according to an example of an embodiment of the present invention.

2 is a diagram showing the effect of a backlight device according to an example of an embodiment of the present invention.

FIG. 3 illustrates a cross-sectional view of a backlight device according to another example of an embodiment of the present invention.

Figure 4a shows a schematic diagram of the principle of optical transmission of a conventional optical fiber.

Figure 4b shows a schematic diagram of the optical transmission principle of a side wall illuminated fiber.

List of reference signs

1-optical coupling component, 2-light source component, 3-fiber, 31-first fiber section, 32-second fiber section, 4-point source, 5-core, 6-cladding

detailed description

Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the drawings. The same reference numerals in the drawings denote the same or similar elements. Although the implementation is shown in the drawings Various aspects of the examples, but the drawings are not necessarily drawn to scale unless otherwise indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustrative." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or preferred.

In addition, numerous specific details are set forth in the Detailed Description of the invention in the Detailed Description. Those skilled in the art will appreciate that the invention may be practiced without some specific details. In other instances, well-known methods, means, components, and circuits are not described in detail to facilitate the invention.

Example 1

FIG. 1 shows a front view of a backlight device in accordance with an embodiment of the present invention. As shown in FIG. 1, the backlight device mainly comprises: a light source component 2, an optical coupling component 1, an optical fiber 3 and a point light source 4. The optical fiber 3 is located near the edge of the optical coupling component 1; the light of the point light source 4 can illuminate the end of the optical fiber 3. A part of the light is emitted via the side wall of the optical fiber 3; the light emitted from the light source assembly 2 and the side wall of the optical fiber 3 can be converted into planar light via the optical coupling assembly 1.

In this embodiment, the optical fiber 3 capable of emitting light from the side wall is disposed near the edge of the optical coupling component 1 and is illuminated by the point light source 4, and the optical fiber 3 is combined with the light source assembly 1 to provide a backlight source for the backlight device. Thus, the illumination adjustment capability to the edge of the optical coupling unit 1 is enhanced, so that the backlight device according to the embodiment of the present invention can flexibly control the display brightness of the screen edge as needed.

Light source assembly 2

In this embodiment, the light source assembly 2 provides a light source for the backlight device, which may include a light source, a light source reflecting member, a light source protecting member, and the like. The type of the light source can be selected as needed, and for example, a light emitting diode (LED), a cold cathode tube fluorescent lamp (CCFL), or an electroluminescence (EL) can be used. In different application scenarios, the light emitted by the light source assembly 2 may be point light or linear light.

Optical coupling component 1

In this embodiment, the optical coupling component 1 can be used to convert point light or linear light into a planar shape. The components of the light may include, for example, a reflector, a light guide, a diffusion sheet, and the like. The reflector can reflect the light emitted by the light source assembly, and the reflected light passes through the light guide plate or the diffusion sheet to form a uniformly distributed surface light source.

Fiber 3

The optical fiber 3 according to the present embodiment is an optical fiber that emits part of light through the side wall of the optical fiber after the light is irradiated on the end portion of the optical fiber.

Figure 4a shows a schematic diagram of the principle of optical transmission of a conventional optical fiber. Due to the unique design of the refractive index of the core 5 and the cladding 6 of the conventional optical fiber, when the light is conducted in the optical fiber, it does not diffuse outside the optical fiber due to total reflection, but the specially processed or fabricated optical fiber can be in the light transmission process. Part of the light is scattered into the external environment of the sidewall of the fiber, making the fiber similar to a line source. Figure 4b is a schematic diagram showing the principle of optical transmission of a sidewall-illuminated fiber, in which some methods can be used to destroy the uniformity structure of the fiber core and the cladding, for example, using a high-energy laser to illuminate certain positions of the core, changing it The refractive index, and thus the light, scatters as it propagates to these locations, so that light is emitted from the sidewalls of the fiber. When special processing is applied to the optical fiber by this method, the optical parameters of each position can be controlled to be consistent by controlling the optical parameters of each position.

In one possible implementation, the optical fiber may include a first fiber portion 31 and a second fiber portion 32, the first fiber portion 31 being a conventional fiber, and the second fiber portion 32 being a specially treated or fabricated sidewall that can emit light. The fiber, the light of the point source 4 can be irradiated to the end of the first fiber portion 31 and transmitted to the second fiber portion 32 via the first fiber portion 31, and a portion of the light transmitted to the second fiber portion 32 via the second fiber portion 32. The sidewalls are emitted outside the fiber.

In a possible implementation, the end of each of the optical fibers 3 may be provided with a point source 4. The illumination parameters (e.g., illumination brightness, color, time, etc.) of each point source 4 can be independently adjusted to achieve more flexible control. However, the corresponding manner of the point light source 4 and the optical fiber 3 is not limited thereto. For example, the plurality of optical fibers 3 may share one point light source 4, and those skilled in the art may set them as needed.

In one possible implementation, the second optical fiber 32 portion may be a side optical fiber, for example, a solid core side optical fiber or a liquid core side optical fiber.

Point light source 4

The point light source 4 in this embodiment can illuminate the end of the optical fiber 3. Since the optical fiber 3 is specially processed or fabricated, the optical fiber 3 itself can be regarded as a line light source during the conduction process, and the point light source 4 can be adjusted. The illuminating parameters, in turn, change the illuminating parameters of the optical fiber 3, thereby flexibly controlling the brightness of the screen edge display according to the need for display brightness in different situations. The point light source 4 may be a light emitting diode (LED).

Different examples of the present embodiment will be described below by taking a side-lit backlight device and a direct-lit backlight device as examples, respectively. These examples are for ease of understanding and are not intended to limit the invention in any way.

In one possible implementation, the light source assembly 2 may be located on one side or opposite sides of the optical coupling assembly 1 in this manner, commonly referred to as a side-lit backlight device, as shown in FIGS. 1 and 2. The light source assembly 2 can be a linear light source assembly, for example the light source can be a cold cathode tube fluorescent lamp (CCFL). The optical fiber 3 may be disposed near an edge of at least one side of the optical coupling assembly 1 other than the side where the light source assembly is located. Preferably, if the light source component 2 is located on either side of the light coupling component 1, the optical fiber 3 may be disposed near the edge of the three sides other than the side where the light coupling component 1 is located, and FIG. 1 is a front view of the backlight device in this case. 2 is a schematic diagram of the effect of the backlight device. Compared with FIG. 1, in the case of illuminating the point light source 4, since the side wall of the optical fiber 3 emits light, the brightness of the vicinity of the edges of the three sides of the optical fiber 3 in FIG. 2 is increased. If the light source unit 2 is located on opposite sides of the light coupling unit 1, the optical fibers 3 may be disposed near the edges of the opposite sides other than the side where the light coupling unit 1 is located.

In another possible implementation, the light source assembly 2 can be located below the light coupling assembly 1, which is generally referred to as a direct type backlight device, as shown in FIG. FIG. 3 illustrates a cross-sectional view of a backlight device according to another example of an embodiment of the present invention. The same components in Fig. 3 as those in Fig. 1 have the same functions, and a detailed description of these components will be omitted for the sake of brevity. As shown in FIG. 3, the main difference between the backlight device shown in FIG. 3 and the backlight device shown in FIG. 1 is that both the light source assembly 2 and the optical coupling assembly 1 are The relative positional relationship is different. The light source assembly 2 can be a point light source assembly, for example the light source can be a light emitting diode (LED). The optical fiber 3 may be disposed near an edge of at least one of the four sides of the optical coupling assembly 1. 3 shows a cross-sectional view of a direct type backlight device in which the optical fibers 3 are disposed near edges of opposite sides of the light coupling assembly 1, wherein the point source is not shown. The optical fibers 3 may also be disposed near the edges of the four sides of the optical coupling assembly 1.

By utilizing the characteristics that the optical fiber is easily bent, the point light source 4 can be disposed at any position below the optical coupling assembly 1, that is, without affecting normal illumination, and can fully utilize the space under the optical coupling assembly.

Example 2

Another embodiment of the present invention also provides a method of controlling a backlight device. This control method can be used to control the backlight device described in Embodiment 1.

In one example, the method may include illuminating the point source 4 to cause the corresponding optical fiber 3 to illuminate if the brightness of the edge display needs to be increased, thereby increasing the display brightness of the edge where the corresponding optical fiber 3 is located. In some application scenarios, it may be necessary to increase the display brightness of the edge. For example, when displaying photos, especially night scene photos, due to the camera, things in the center of the photo are generally highlighted, while things outside the center are relatively dim. Sometimes you can't even recognize any details near the edge of the photo, but you need to increase the display brightness of the edges to enrich the information about the edges. In this case, the point source can be illuminated to illuminate the corresponding fiber, thereby increasing the display brightness of the edge where the corresponding fiber is located.

In one example, the control method may further include turning off the point light source 4 so that the corresponding optical fiber 3 does not emit light, in order to reduce the brightness of the edge display, thereby lowering the display brightness of the edge where the corresponding optical fiber 3 is located.

In some applications, it may be necessary to reduce the brightness of the edge display. For example, many 4K or 1080P resolution TVs in the existing market usually set the replay rate to 100% in order to display the HD source in a point-to-point manner. In this mode, low-resolution sources are displayed, especially when some VCDs are produced in the early stage, which will show the edges of the screen, and these impurities will affect the viewer. Visual effects, so it is necessary to reduce the display brightness of the edges to weaken the display of the matte edges. In this case, the point source can be turned off so that the corresponding fiber does not emit light, so that the display brightness of the edge where the corresponding fiber is located is lowered.

In another example of this embodiment, the controlling method may further include: causing the optical fiber at the edge near the first region in the display screen to emit light, and the optical fiber at the edge near the second region does not emit light, wherein the display of the first region The brightness is higher than the display brightness of the second area. In this example, if it is determined that the display brightness of the first area is higher than the display brightness of the second area, for example, a picture includes a moon and a path, the moon is located in the first area, and the path is located in the second area, in order to highlight the moonlight The quietness of the chastity and the path needs to increase the display brightness of the first area and reduce the display brightness of the second area. In this case, the corresponding point source can be illuminated to illuminate the corresponding fiber near the first area, and the corresponding The point light source makes the corresponding optical fiber in the vicinity of the second area not emit light, so that the brightness of the backlight is consistent with the brightness of the picture display, and the screen display effect is enhanced.

In a possible implementation manner, the backlight device of the present invention can also cooperate with a local backlighting function to flexibly control the display brightness of the screen edge according to requirements, so that the overall brightness of the screen is displayed. The brightness of the picture is coordinated to enhance the display.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Practicality

According to an embodiment of the present invention, a backlight device and a control method thereof are provided by arranging an optical fiber capable of emitting light from a side wall near an edge of a light coupling component, and illuminating the light source by using a point light source. Providing a backlight source for the backlight device together enhances the illumination adjustment capability of the edge of the light coupling component, thereby enabling the backlight device according to an embodiment of the present invention to flexibly control the display brightness of the edge of the screen as needed.

Claims

A backlight device, comprising: a light source assembly (2), an optical coupling assembly (1), an optical fiber (3), and a point light source (4),

The optical fiber (3) is located near an edge of the optical coupling component (1);

The light of the point source (4) is capable of illuminating the end of the optical fiber (3), a portion of the light being emitted via a sidewall of the optical fiber (3);

Light emitted by the light source assembly (2) and the side walls of the optical fiber (3) is converted into planar light via the optical coupling assembly (1).
The backlight device according to claim 1, wherein the light source component (2) is located on one side or opposite sides of the light coupling component (1), and the optical fiber (3) is disposed on the light The vicinity of the edge of at least one side of the coupling assembly (1) other than the side on which the light source assembly (2) is located.
The backlight device according to claim 1, wherein the light source component (2) is located below the light coupling component (1), and the optical fiber (3) is disposed on the light coupling component (1) Near at least one of the edges.
The backlight device according to claim 1, wherein said optical fiber (3) comprises a first optical fiber portion (31) and a second optical fiber portion (32), and said point light source (4) illuminates said light The end of the first fiber portion (31) is transferred to the second fiber portion (32) via the first fiber portion (31), and a portion of the light transmitted to the second fiber portion (32) is passed through the second fiber portion (32) The sidewalls are emitted outside the fiber.
A backlight device according to claim 1, characterized in that one end of each of said optical fibers (3) is provided with said point light source (4).
The backlight device according to any one of claims 1 to 5, characterized in that the illumination parameters of the point light sources (4) can be independently adjusted.
The apparatus of claim 4 wherein said second fiber portion (32) is a side optical fiber.
A control method of a backlight device for controlling a backlight device according to any one of claims 1 to 7, the control method comprising:

In the case where it is required to increase the brightness of the edge display, the point light source (4) is illuminated to cause the corresponding optical fiber (3) to emit light, thereby increasing the display brightness of the edge where the corresponding optical fiber (3) is located.
The control method according to claim 8, further comprising:

In the case where it is desired to reduce the brightness of the edge display, the point source (4) is turned off so that the corresponding fiber (3) does not emit light, so that the display brightness of the edge where the corresponding fiber (3) is located is lowered.
The control method according to claim 8, further comprising:

Controlling the point light source such that the optical fiber (3) at the edge near the first area in the display screen emits light, and the optical fiber (3) at the edge near the second area does not emit light, wherein the display brightness of the first area is higher than the second The display brightness of the area.