TW202316055A - Backlight source for direct-type backlight module wherein the refractive light-emitting elements and the reflective light-emitting elements are simultaneously installed on the base to constitute a hybrid backlight, thereby achieving the purpose of high efficiency and low cost - Google Patents

Abstract

A backlight source for direct-type backlight module comprises a base and a light emitting unit. The base includes a substrate with a setting surface, a surrounding wall extending upward from the periphery of the substrate, and a reflector disposed on the surrounding wall. The surrounding wall and the setting surface jointly define a setting space. The light emitting unit includes a plurality of refractive light-emitting elements and reflective light-emitting elements, both of which are arranged in an array on the setting space and located in the setting space, wherein the reflector is arranged at an angle to the surrounding wall and inclined toward the direction of the light emitting unit. The reflector surrounds the light emitting unit and extends toward the setting space. The distance from the outer periphery of the reflector to the inner periphery of the reflector is the width of the reflector. The width of the reflector is between 28mm~30mm. The shortest vertical distance from the setting surface to the reflector is the minimum height of the reflector. The minimum height of the reflector is between 10mm~15mm. The maximum vertical distance from the setting surface to the reflector is the maximum height of the reflector. The maximum height of the reflector is between 20mm~23mm. According to the present invention, the refractive light-emitting elements and the reflective light-emitting elements are simultaneously installed on the substrate to constitute a hybrid backlight, thereby achieving the purpose of high efficiency and low cost. Furthermore, the specially cut reflector can be set to achieve uniform brightness of the backlight unit.

Description

Backlight applied to direct-lit backlight modules

The invention relates to a backlight source, in particular to a backlight source applied to a direct-lit backlight module.

The backlight unit (BLU) used in the existing direct-lit liquid crystal display module (LCM) is mainly composed of refraction-type light-emitting elements, or entirely composed of reflective-type light-emitting elements. The components can provide higher brightness, while the use of reflective light-emitting components focuses on low-brightness applications with a very small number of chips to achieve low cost.

However, if the brightness of the backlight is to be increased in the existing direct-type liquid crystal display module, the backlight using the refraction light-emitting element needs to increase the number of refraction light-emitting elements, which increases the cost; while the backlight using the reflective light-emitting element To achieve high brightness, there will be a problem of increased power consumption.

Therefore, the object of the present invention is to provide a backlight applied to a direct-lit backlight module.

Therefore, the backlight applied to the direct type backlight module of the present invention includes a base and a light emitting unit.

The base includes a base with a setting surface, a surrounding wall extending upward from the surrounding of the base, and a reflective sheet arranged on the surrounding wall. The surrounding wall and the setting surface jointly define a setting space.

The light-emitting unit includes a plurality of refraction-type light-emitting elements and reflective light-emitting elements arranged in an array on the installation surface and located in the installation space, wherein the reflective sheet is arranged at an angle to the surrounding wall and is inclined toward the light-emitting unit.

The effect of the present invention is that a refraction light-emitting element and a reflective light-emitting element are arranged on the base to form a hybrid backlight to achieve high efficiency and low cost. Uniforms the overall brightness of the source.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numerals.

Referring to FIG. 1 and FIG. 2 , a first embodiment of the present invention applied to a backlight of a direct type backlight module includes a base 2 and a light emitting unit 3 disposed in the base 2 .

The base 2 includes a base 21 with a setting surface 210, a surrounding wall 22 extending upwards from the base 21, and a reflective sheet 23 arranged on the surrounding wall 22, the surrounding wall 22 and the base 21 The installation surface 210 jointly defines an installation space 20 for the lighting unit 3 to be installed, and the reflective sheet 23 is arranged at an angle to the surrounding wall 22 and is inclined toward the direction of the lighting unit 3 .

The light emitting unit 3 includes a plurality of refraction light emitting elements 31 and reflective light emitting elements 32 arrayed on the installation surface 210 and located in the installation space 20 . Specifically, in the first embodiment, the light-emitting units 3 are arranged in a matrix, and the reflective light-emitting elements 32 are formed into a square shape to surround the refraction-type light-emitting elements 31 Arrangement means that the reflective light-emitting elements 32 are arrayed at the outermost periphery, and the refraction-type light-emitting elements 31 are arranged in an array relatively centrally so as to be surrounded by the reflective light-emitting elements 32 .

Preferably, the distance between the outermost periphery of the refraction light emitting elements 31 and the reflective light emitting elements 32 is defined as the light overlapping area A. The width of the light overlapping area A is the distance D between the refraction light-emitting element 31 and the reflective light-emitting element 32, which can be calculated through optical simulation. In this embodiment, the optimum distance D It is between 98nm~102nm to make the white picture more uniform. When the distance D is less than 98nm, it is easy to cause internal bright circles, and if the distance D is greater than 102nm, it is easy to cause internal dark circles.

In the first embodiment, when the backlight applied to the direct-lit backlight module is in the white screen state, the brightness of the four surrounding areas is the brightness of the refraction light emitting elements 31 and the brightness of the reflective light emitting elements 32 Superimposed, it is preferable to allow the brightness of the refraction light emitting elements 31 to account for 40%, and allow the brightness of the reflective light emitting elements 32 to account for 60%; at the same time, in the white picture state, the brightness of the four corners Guided by the reflection sheet 23, the light from the refraction light emitting elements 31 reaches the corners, so that the ratio of the central brightness of the backlight to the brightness of the four corners is below 1.8.

It should be noted that the arrangement of the refraction light emitting elements 31 and the reflective light emitting elements 32 is not particularly limited, and they can also be arranged with a fixed pitch or a progressive pitch. In this embodiment, the refraction light-emitting elements 31 and the reflective light-emitting elements 32 use light-emitting diodes as light sources, and refraction lenses and light-emitting diodes are respectively arranged on a plurality of light-emitting diodes (LEDs). The reflective lens constitutes the refraction light emitting elements 31 and the reflective light emitting elements 32 . In addition, the light emitting diodes may be white light emitting diodes or blue light emitting diodes. In addition, FIG. 1 mainly shows the arrangement relationship between the refraction light emitting elements 31 and the reflective light emitting elements 32, and the structure of the reflective sheet 23 is omitted. The detailed structure of the reflective sheet 23 is shown in FIG. 2 .

The reflective sheet 23 surrounds the light-emitting unit 3 corresponding to the surrounding wall 22 and extends obliquely toward the installation space 20 , and preferably through setting the reflective sheet 23 obliquely and adjusting the distance from the light-emitting unit 3 , etc. The structural design can further make the overall brightness more uniform.

In this embodiment, the overall slope width of the reflective sheet 23 can be defined as the reflective sheet width W from the outer peripheral edge 231 of the reflective sheet 23 to the inner peripheral edge 232 of the reflective sheet, so that the reflective sheet width W is between 28mm ~30mm.

Regarding the height between the reflective sheet 23 and the base 21, the shortest vertical distance from the installation surface 210 to the reflective sheet 23 can be defined as the minimum height H1 of the reflective sheet, so that the minimum height H1 of the reflective sheet is between 10 mm and 15 mm. And define the maximum vertical distance from the setting surface 210 to the reflection sheet 23 as the maximum height H2 of the reflection sheet, so that the maximum height H2 of the reflection sheet is between 20mm~23mm.

Regarding the distance relationship between the reflective sheet 23 and the light-emitting unit 3, in this embodiment, the shortest vertical distance from the center C of the reflective light-emitting element 32 closest to the reflective sheet 23 to the reflective sheet 23 can be defined as The minimum distance L1 from the light-emitting element to the reflective sheet is between 30mm and 40mm; The distance L2 from the wall, the distance L2 from the light emitting element to the surrounding wall is between 30 mm and 60 mm. Through the detailed structure of the reflective sheet 23 defined above, the appearance of the specific example 1 of the reflective sheet 31 shown in FIG. 2 is presented

In addition, black ink printing can be added to the slope of the reflection sheet 23 to adjust the uniformity of the brightness of the overall backlight. The amount of black ink used and the printing area can be adjusted according to the brightness of the overall backlight. It should be noted that in the first embodiment, the reflective light-emitting elements 32 are disposed on the outermost periphery and closest to the reflective sheet 23 , therefore, FIG. 2 uses the reflective light-emitting elements 32 as an example for illustration.

Referring to FIG. 3 to FIG. 5 , different forms of the reflective sheet 23 are shown. The reflective sheet 23 shown in FIG. 3 to FIG. 5 will be described as specific example 2, specific example 3, and specific example 4 below. The reflective sheet 23 of the specific example 2 (Fig. 3) and the specific example 3 (Fig. 4) has little difference from the specific example 1; The difference of the sheet 23 is that the reflective sheet 23 of the specific example 4 surrounds the light-emitting unit 3 and extends away from the installation space 20. The relevant definitions of the specific examples 2 to 4 are the same as those of the specific example 1 Same, that is to say, there is no special limitation on the aspect of the reflective sheet 23 as long as it meets the definition of the specific example 1, and the aspects of other modified examples all belong to the scope of the present invention and are not listed here.

Referring to Fig. 6, a second embodiment of the present invention applied to the backlight of the direct type backlight module is substantially the same as the first embodiment, and the difference between the second embodiment and the first embodiment is that the refractive The light-emitting element 31 and the reflective light-emitting elements 32 are arranged in positions. Specifically, in the second embodiment, the positions of the refraction light emitting elements 31 and the reflective light emitting elements 32 of the first embodiment are reversed, that is, the refraction type light emitting elements 31 are set at The outermost periphery surrounds the reflective light emitting elements 32 .

In summary, by setting the refraction light emitting element 31 and the reflective light emitting element 32 on the base 2 at the same time, and letting the reflective light emitting element 32 surround the refraction light emitting element 31 (or the refraction light emitting element 31 surrounds the reflective light emitting element 32) in a matrix arrangement to form a hybrid backlight, and with the setting of the reflector 23, the overall brightness of the backlight can be uniformed, so the purpose of the present invention can indeed be achieved.

But the above-mentioned ones are only embodiments of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

2: Base 20: Set the space 21: Base 210: set surface 22: around the wall 23: reflector 231: outer periphery 232: inner periphery 3: Lighting unit 31: Refractive luminous parts 32: reflective luminous parts A: Light overlapping area D: Spacing C: center H1: Minimum height of reflector H2: Maximum height of reflector L1: The minimum distance from the luminous part to the reflector L2: the distance from the luminous part to the surrounding wall W: reflector width

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: FIG. 1 is a schematic top view illustrating a first embodiment of the present invention applied to a backlight source of a direct-lit backlight module omitting reflector elements; Fig. 2 is a partial cross-sectional schematic diagram illustrating the specific example 1 of the reflection sheet of the present invention applied to the backlight of the direct type backlight module; Fig. 3 is a partial cross-sectional schematic diagram illustrating the specific example 2 of the present invention applied to the reflection sheet of the backlight of the direct type backlight module; Fig. 4 is a partial cross-sectional schematic diagram illustrating the specific example 3 of the present invention applied to the reflection sheet of the backlight of the direct type backlight module; Fig. 5 is a partial cross-sectional schematic diagram illustrating the specific example 4 of the reflection sheet applied to the backlight of the direct type backlight module of the present invention; and FIG. 6 is a schematic top view illustrating a second embodiment of the present invention applied to a backlight source of a direct-lit backlight module omitting a reflector element.

20: Set the space

21: Base

210: set surface

22: around the wall

23: reflector

231: outer periphery

232: inner periphery

32: reflective luminous parts

C: center

H1: Minimum height of reflector

H2: Maximum height of reflector

L1: The minimum distance from the luminous part to the reflector

L2: the distance from the luminous part to the surrounding wall

W: reflector width

Claims (10)

A backlight applied to a direct-lit backlight module, comprising: A base, including a base with a setting surface, a surrounding wall extending upward from the surrounding of the base, and a reflective sheet arranged on the surrounding wall, the surrounding wall and the setting surface jointly define a setting space; and A light emitting unit, comprising a plurality of arrays of refraction light emitting elements and reflective light emitting elements arranged on the installation surface and located in the installation space, wherein the reflective sheet is arranged at an angle to the surrounding wall and is inclined toward the light emitting unit . The backlight applied to the direct-lit backlight module according to claim 1, wherein the reflective light-emitting elements are arranged around the refractive light-emitting elements. The backlight applied to the direct-lit backlight module according to claim 1, wherein the refraction-type light-emitting elements are arranged around the reflective-type light-emitting elements. The backlight applied to the direct-lit backlight module according to Claim 1, wherein the reflective sheet surrounds the light-emitting unit and extends toward the installation space. The backlight applied to the direct-lit backlight module according to claim 1, wherein the reflective sheet surrounds the light emitting unit and extends away from the installation space. The backlight applied to the direct-type backlight module as described in claim 4 or 5, wherein the distance from the outer periphery of the reflector to the inner periphery of the reflector is defined as the width of the reflector, and the width of the reflector is between 28mm ~30mm. The backlight applied to the direct-lit backlight module as described in Claim 1, wherein the shortest vertical distance from the setting surface to the reflector is defined as the minimum height of the reflector, and the minimum height of the reflector is between 10 mm and 15 mm. The backlight applied to the direct-lit backlight module as described in Claim 1, wherein the maximum vertical distance from the installation surface to the reflector is defined as the maximum height of the reflector, and the maximum height of the reflector is between 20 mm and 23 mm. The backlight applied to the direct-lit backlight module as described in claim 1, wherein, defining the center of the refracting light-emitting element or the reflective light-emitting element closest to the reflective sheet, the shortest vertical distance to the reflective sheet is The minimum distance from the light-emitting element to the reflector is between 30mm and 40mm. The backlight applied to the direct-lit backlight module as described in claim 1, wherein the distance from the surrounding wall to the center of the nearest refractive light-emitting element or the reflective light-emitting element is defined as the distance from the light-emitting element to the surrounding wall , the distance from the luminous element to the surrounding wall is 30-60 mm.

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