TWI664445B - Display device and direct-type backlight thereof - Google Patents

Abstract

A display device and a direct type backlight plate thereof. The direct type backlight plate includes a central area and a peripheral area. The central area is provided with a plurality of central area light emitting elements to provide light to the liquid crystal display panel. The density of these central region light emitting elements in the central region is the first density. The peripheral area is provided with a plurality of peripheral area light emitting elements to provide light to the liquid crystal display panel. The density of these peripheral region light-emitting elements in the peripheral region is the second density. Wherein, the second density is smaller than the first density.

Description

Display device and direct type backlight plate

The present invention relates to a liquid crystal display device, and more particularly, to a head-mounted display device and a direct type backlight plate thereof.

The liquid crystal display includes a liquid crystal display panel and a backlight. The backlight module can provide a surface light source to the liquid crystal display panel so that the user can view the image displayed by the liquid crystal display panel. Generally speaking, the backlight module can be divided into a direct type backlight and a side type backlight. Compared with the side-light type backlight, the direct-type backlight can provide a higher-brightness surface light source. Therefore, when there is a high demand for the brightness of the backlight source, a direct type backlight module is usually used.

The present invention provides a display device and a direct type backlight plate thereof, so as to effectively improve the contrast in the central region and / or reduce the number of light emitting elements in the peripheral region. The display device of the present invention can be used in a head-mounted display (HMD) device, and the head-mounted display device can be worn by a user so that the user can be placed in a virtual reality (virtual reality) or An augmented reality.

An embodiment of the present invention provides a direct type backlight board. The direct type backlight plate includes a central area and a peripheral area. The central area is provided with a plurality of central area light emitting elements to provide light to the liquid crystal display panel. The density of these central region light emitting elements in the central region is the first density. The peripheral area is provided with a plurality of peripheral area light emitting elements to provide light to the liquid crystal display panel. The density of these peripheral region light-emitting elements in the peripheral region is the second density. Wherein, the second density is smaller than the first density.

An embodiment of the present invention provides a display device. The display device includes a liquid crystal display panel and a direct type backlight panel. The direct type backlight plate includes a central area and a peripheral area. The central area is provided with a plurality of central area light emitting elements to provide light to the liquid crystal display panel. The density of these central region light emitting elements in the central region is the first density. The peripheral area is provided with a plurality of peripheral area light emitting elements to provide light to the liquid crystal display panel. The density of these peripheral region light-emitting elements in the peripheral region is the second density. Wherein, the second density is smaller than the first density.

In the direct type backlight panel according to the embodiments of the present invention, the light emitting elements in different regions have different element densities. The light emitting element in the center region of interest to the user has a high element density. Therefore, the direct type backlight panel described in the embodiments can effectively improve the contrast and image performance of the central area, and can improve the problem of afterimages in dynamic images. The light-emitting element in the peripheral region of the direct type backlight panel has a lower element density. For example, the direct type backlight panel described in the embodiments can reduce the number of light emitting elements in the peripheral area, so as to reduce the cost of the backlight module.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

The term "coupling (or connection)" used throughout the specification of this case (including the scope of patent application) can refer to any direct or indirect means of connection. For example, if the first device is described as being coupled (or connected) to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be connected through another device or some This connection means is indirectly connected to the second device. In addition, wherever possible, the same reference numbers are used in the drawings and embodiments to represent the same or similar parts. Elements / components / steps using the same reference numerals or using the same terms in different embodiments may refer to related descriptions.

FIG. 1 is a schematic diagram of an application scenario of a display device 100 according to an embodiment of the present invention. In the embodiment shown in FIG. 1, the display device 100 may be used in a head-mounted display (HMD) device. That is, the display device 100 may be worn on the head of the user 10 so that the user 10 can view the image displayed by the display device 100.

The display device 100 includes a liquid crystal display panel 110 and a direct type backlight panel 120. The direct type backlight plate 120 can provide a surface light source to the liquid crystal display panel 110 so that the user 10 can view the image displayed by the liquid crystal display panel 110. Generally, when the user 10 wears a head-mounted display device including the display device 100 of the present invention, the user 10 will be placed in a virtual reality or augmented reality. Of view (FOV) 11 is a central area 101 that falls on the liquid crystal display panel 110 (direct-type backlight 120). That is, the central area 101 is an area of interest to the user 10. Compared to the image displayed in the central area 101, the image displayed in the peripheral area 102 of the liquid crystal display panel 110 (the direct-type backlight 120) is relatively less important.

FIG. 2 is a schematic perspective view illustrating the liquid crystal display panel 110 and the direct type backlight panel 120 shown in FIG. 1 according to an embodiment of the present invention. In the direct type backlight panel 120 shown in FIG. 2, each small dot represents a light emitting element. According to design requirements, the light-emitting element may be a light-emitting diode (LED) or other light-emitting element. In the embodiment shown in FIG. 2, the direct type backlight plate 120 includes a central region 101 and a peripheral region 102. The central area 101 may be defined in accordance with a main field of view (FOV) 11 of the user 10. By way of example (but not limited to this), a range covered by the main field of view 11 of 20 ° may be defined as the central region 101.

A plurality of central area light emitting elements are arranged in the central area 101 of the direct type backlight plate 120. In the embodiment shown in FIG. 2, the central region 101 of the direct type backlight plate 120 has 6 * 6 central region light emitting elements. These central area light emitting elements of the central area 101 can provide light to the central area of the liquid crystal display panel 110.

The peripheral region 102 of the direct type backlight plate 120 is provided with a plurality of peripheral region light emitting elements. In the embodiment shown in FIG. 2, the peripheral region 102 of the direct type backlight plate 120 has 6 * 4-2 * 2 peripheral region light-emitting elements. These peripheral area light emitting elements of the peripheral area 102 can provide light to the peripheral area of the liquid crystal display panel 110.

The density of these central region light emitting elements in the central region 101 is the first density, and the density of these peripheral region light emitting elements in the peripheral region 102 is the second density, wherein the second density is smaller than the first density. In other words, the light emitting elements in different regions of the direct type backlight panel 120 have different element densities. The light emitting element in the peripheral region 102 of the direct type backlight plate 120 has a lower element density. For example, the number of light-emitting elements in the peripheral area may be reduced in order to reduce the cost of the direct type backlight plate 120. The light-emitting element in the central region 101 of interest to the user 10 has a high element density. Therefore, the direct type backlight plate 120 can effectively improve the contrast and image performance of the central area 101, and can improve the problem of afterimages in dynamic images.

FIG. 3 is a schematic perspective view illustrating the liquid crystal display panel 110 and the direct type backlight panel 120 shown in FIG. 1 according to another embodiment of the present invention. In the direct type backlight plate 120 shown in FIG. 3, each small dot represents a light emitting element. According to design requirements, the light emitting element may be a light emitting diode (LED) or other light emitting elements. In the embodiment shown in FIG. 3, the direct type backlight panel 120 includes a central region 101 and a peripheral region 102. The central region 101 and the peripheral region 102 shown in FIG. 3 can be deduced by analogy with reference to the related description in FIG.

The direct type backlight plate 120 further includes one or more first regions 103. The first region 103 is disposed between the central region 101 and the peripheral region 102. Each first region 103 is provided with a plurality of first region light emitting elements. In the embodiment shown in FIG. 3, the direct type backlight plate 120 further includes two first regions 103. Each of the first regions 103 is provided with 2 * 4 first region light-emitting elements. These first region light emitting elements can provide light to corresponding regions of the liquid crystal display panel 110. The density of the first region light emitting elements in the first region 103 is a third density, wherein the third density is between the first density and the second density.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

10: user 11: main field of view 100: display device 101: central area 102: peripheral area 103: first area 110: liquid crystal display panel 120: direct-type backlight

FIG. 1 is a schematic diagram of an application scenario of a display device according to an embodiment of the present invention. FIG. 2 is a schematic perspective view illustrating the liquid crystal display panel and the direct type backlight panel shown in FIG. 1 according to an embodiment of the present invention. 3 is a schematic perspective view illustrating the liquid crystal display panel and the direct type backlight panel shown in FIG. 1 according to another embodiment of the present invention.

Claims (12)

A direct type backlight panel includes: a central region configured with a plurality of central region light emitting elements to provide light to a liquid crystal display panel, wherein the density of the central region light emitting elements in the central region is a first density; A peripheral region is provided with a plurality of peripheral region light emitting elements to provide light to the liquid crystal display panel, wherein the density of the peripheral region light emitting elements in the peripheral region is a second density, and the second density is smaller than the first density. And at least one first region is disposed between the central region and the peripheral region, the first region includes four sides, one of the four sides is adjacent to the central region, and the other three of the four sides are adjacent to the A peripheral region, wherein the at least one first region is provided with a plurality of first region light emitting elements to provide light to the liquid crystal display panel, and the density of the first region light emitting elements in the first region is a third density, And the third density is between the first density and the second density. The direct-type backlight panel according to item 1 of the patent application scope, wherein the central region light-emitting elements in the central region of the direct-type backlight panel are used to provide light to a central region of the liquid crystal display panel, and The peripheral area light emitting elements in the peripheral area of the direct type backlight plate are used to provide light to a peripheral area of the liquid crystal display panel. The direct-type backlight panel according to item 1 of the scope of patent application, wherein the light emitting elements in the central region and the light emitting elements in the peripheral region are light emitting diodes. The direct-type backlight panel according to item 1 of the scope of patent application, wherein the central area is defined according to a main field of view of a user. The direct-type backlight panel according to item 4 of the scope of patent application, wherein the range covered by the main field of view of 20 ° is defined as the central area. A display device includes: a liquid crystal display panel; and a direct type backlight panel including a central area, at least a first area, and a peripheral area, wherein the central area is provided with a plurality of central area light emitting elements to provide light to the In a liquid crystal display panel, the density of the light emitting elements in the central region is a first density in the central region. A plurality of light emitting elements in the peripheral region are configured to provide light to the liquid crystal display panel. The density in the peripheral region is a second density, and the second density is smaller than the first density, wherein the at least one first region is disposed between the central region and the peripheral region, and the first region includes four sides One of the four sides is adjacent to the central area, the other three of the four sides are adjacent to the peripheral area, and the at least one first area is configured with a plurality of first area light emitting elements to provide light to the liquid crystal display panel The density of the light emitting elements in the first region in the first region is a third density, and the third density is between the first density and Between the second density. The display device according to item 6 of the patent application, wherein the central area light-emitting elements in the central area of the direct-type backlight plate are used to provide light to a central area of the liquid crystal display panel, and The peripheral area light emitting elements in the peripheral area of the backlight panel are used to provide light to a peripheral area of the liquid crystal display panel. The display device according to item 6 of the scope of patent application, wherein the central region light emitting elements and the peripheral region light emitting elements are light emitting diodes. The display device according to item 6 of the patent application, wherein the central area is defined according to a main field of view of a user. The display device according to item 9 of the scope of patent application, wherein a range covered by the main field of view of 20 ° is defined as the central region. The display device according to item 6 of the scope of patent application, wherein the display device is used for a head-mounted display device. The display device according to item 11 of the scope of patent application, wherein the head-mounted display device is used in a virtual reality or an augmented reality.