CN114545684A - Backlight module and display panel - Google Patents

Abstract

The application provides a backlight unit and display panel, backlight unit includes: the LED light source comprises a substrate, a backlight source and a light reflecting retaining wall, wherein the backlight source is arranged on the substrate and comprises a plurality of light mixing units which are arranged in an array manner, each light mixing unit comprises two rows of LED chips which are arranged in a staggered manner, and each row of LED chips comprises a red LED chip, a green LED chip and a blue LED chip; the light emitting color of any one LED chip in the light mixing unit is different from the light emitting colors of all the adjacent LED chips; the light reflecting retaining wall is arranged on the substrate and surrounds the light mixing unit, the light reflecting retaining wall is used for mixing the light units, one end of each light mixing unit is three, and the LED chips are separated from the other end of each light mixing unit. The backlight module can improve the uniformity of mixed light.

Description

Backlight Modules and Display Panels

technical field

The present application belongs to the field of display technology, and in particular relates to a backlight module and a display panel.

Background technique

The backlight module is a device in the display panel that provides a light source for the liquid crystal cell, and its luminous effect and performance parameters directly affect the visual effect of the display panel. LED light-emitting elements have the advantages of excellent optoelectronic performance and small size, so they have gradually become the mainstream light sources in backlight modules. The LED light-emitting elements used in the direct-type backlight module are increasingly miniaturized. After the size of the LED light-emitting element becomes smaller, the LED light-emitting elements in the backlight module are made more dense, which reduces the light mixing distance and the thickness of the module. The display panel is energy-saving, thin and light, and has a high color gamut, but it is also prone to the problem of uneven light mixing.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a backlight module and a display panel to solve the problem of uneven light mixing in the existing backlight module.

In a first aspect, the embodiments of the present application provide a backlight module, including:

substrate;

The backlight source is arranged on the substrate, the backlight source includes a plurality of light mixing units arranged in an array, the light mixing unit includes two rows of LED chips arranged in a staggered position, and each row of the LED chips includes one A red LED chip, a green LED chip, and a blue LED chip; the light-emitting color of any one of the LED chips in the light mixing unit is different from the light-emitting color of all the adjacent LED chips;

A reflective blocking wall, the reflective blocking wall is disposed on the substrate, the reflective blocking wall surrounds the light mixing unit and connects the three LED chips at one end of the light mixing unit with the three LED chips at the other end. The LED chips are separated.

Optionally, the width of the LED chip is 20-500 μm.

Optionally, the distance between two adjacent LED chips in the light mixing unit is 20-500 μm.

Optionally, the triangle formed by the connection of the three LED chips at one end of the light mixing unit is congruent with the triangle formed by the connection of the three LED chips at the other end of the light mixing unit.

Optionally, the triangle formed by the connection of the three LED chips at one end of the light mixing unit is an isosceles triangle or an equilateral triangle; and/or,

The triangle formed by the connecting lines of the three LED chips at the other end of the light mixing unit is an isosceles triangle or an equilateral triangle.

Optionally, the reflective blocking wall is an adhesive layer mixed with highly reflective materials.

Optionally, the shape of the reflective blocking walls surrounding the three LED chips in the light mixing unit is rectangle, circle, hexagon, trapezoid, triangle or irregular polygon.

Optionally, the height of the reflective blocking wall is greater than the height of the LED chip.

In a second aspect, an embodiment of the present application further provides a display panel, where the display panel includes the backlight module according to any one of the above.

In the backlight source of the backlight module provided by the embodiment of the present application, each light mixing unit has two rows of LED chips in a staggered arrangement, and the staggered arrangement can make each LED chip and the adjacent two LED chips in the adjacent row. The distance difference between them is small, and there is no situation in which the LED chips are relatively close to the aligned LED chips and are farther from the adjacent non-aligned LED chips when the LED chips are aligned and arranged. At the same time, the position of the LED chips in the row can also be adjusted as required, so that each LED chip has a suitable light mixing distance with one or two adjacent LED chips in the same row, and also has a suitable light mixing distance with the adjacent LED chips in the adjacent row. There is a suitable light mixing distance between one or two LED chips, so as to achieve the required light mixing effect. Wherein, each row of LED chips includes a red LED chip, a green LED chip and a blue LED chip, and the emission color of any LED chip in the light mixing unit is different from the emission color of all adjacent LED chips. , that is, any LED chip has a different color from one or two adjacent LED chips in the same row, and is different from one or two adjacent LED chips in an adjacent row. At this time, the three LED chips adjacent to each other must be a red LED chip, a green LED chip, and a blue LED chip, and the light mixing of the three can obtain a full color gamut spectrum. The backlight source includes a plurality of light mixing units arranged in an array, and the three-color LED chips are distributed more evenly, which can obtain a better light mixing effect, and at the same time, the color gamut of the entire backlight module can also be improved. At the same time, the backlight module is also equipped with a reflective wall, which can reflect the light that hits the side back, thereby improving the light efficiency. The luminous efficiency is higher under the same energy consumption, and the reflected light can continue to be mixed. light, and further improve the uniformity of light mixing.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of a backlight module provided by an embodiment of the present application.

FIG. 2 is a schematic structural diagram of the backlight module shown in FIG. 1 from another viewing angle.

FIG. 3 is a schematic diagram of a first arrangement of backlight sources in the backlight module shown in FIG. 1 .

FIG. 4 is a schematic diagram of a second arrangement of backlight sources in the backlight module shown in FIG. 1 .

FIG. 5 is a schematic diagram of a third arrangement of backlight sources in the backlight module shown in FIG. 1 .

FIG. 6 is a schematic diagram of a fourth arrangement of backlight sources in the backlight module shown in FIG. 1 .

FIG. 7 is a schematic diagram of a fifth arrangement of backlight sources in the backlight module shown in FIG. 1 .

FIG. 8 is a schematic diagram of a sixth arrangement of backlight sources in the backlight module shown in FIG. 1 .

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

Embodiments of the present application provide a backlight module and a display panel to solve the problem of uneven light mixing in the existing backlight module.

The backlight modules provided in the embodiments of the present application can be applied to display panels. The display panel generally includes a backplane, a backlight module, a diffuser plate, an optical film combination, a middle frame, a liquid crystal layer and an upper frame, which are arranged in order from bottom to top. The backlight module provides a light source for the display panel, and the light mixing uniformity of the backlight module is directly related to the display effect of the display panel.

In order to more clearly illustrate the structure of the backlight module of the embodiments of the present application, the backlight module will be introduced below with reference to the accompanying drawings.

Exemplarily, please refer to FIG. 1 and FIG. 2 for understanding. FIG. 1 is a schematic structural diagram of an embodiment of a backlight module provided by an embodiment of the present application. FIG. 2 is a schematic structural diagram of the backlight module shown in FIG. 1 from another viewing angle. The backlight module includes: a substrate 100, a backlight source 200, and a reflective blocking wall 300. The backlight source 200 is disposed on the substrate 100. The backlight source 200 includes a plurality of light mixing units 210 arranged in an array. The light mixing unit 210 includes two rows of LED chips 211 that are staggered, and each row of the LED chips 211 includes a red LED chip 211R, a green LED chip 211G and a blue LED chip 211B; the light mixing unit 210 The light-emitting color of any one of the LED chips 211 is different from the light-emitting color of all adjacent LED chips 211 ; the reflective blocking wall 300 is disposed on the substrate 100 , and the reflective blocking wall 300 surrounds the The light mixing unit 210 separates the three LED chips 211 at one end of the light mixing unit 210 from the three LED chips 211 at the other end.

In the backlight source 200 of the backlight module provided by the embodiment of the present application, each light mixing unit 210 has two rows of LED chips 211 in a staggered arrangement. The distance difference between the two LED chips 211 is small, and there is no situation that the LED chips 211 are relatively close to the aligned LED chips 211 and far away from the adjacent non-aligned LED chips 211 when they are aligned. At the same time, the position of the LED chips 211 in the row can also be adjusted as required, so that each LED chip 211 has a suitable light mixing distance with one or two adjacent LED chips 211 in the same row, and also has a suitable light mixing distance with the adjacent row. There is a suitable light mixing distance between one or two LED chips 211 adjacent to each other, so as to achieve the required light mixing effect. Wherein, each row of LED chips 211 includes a red LED chip 211R, a green LED chip 211G and a blue LED chip 211B, and the light emission color of any LED chip 211 in the light mixing unit 210 is the same as that of all adjacent LEDs. The emitting colors of the chips 211 are all different, that is, any LED chip 211 has a different color from one or two adjacent LED chips 211 in the same row, and is different from one or two adjacent LED chips 211 in an adjacent row. At this time, the three LED chips 211 adjacent to each other must be a red LED chip 211R, a green LED chip 211G, and a blue LED chip 211B, and the three can be mixed to obtain a full color gamut spectrum. The backlight source 200 includes a plurality of light mixing units 210 arranged in an array, and the three-color LED chips 211 are distributed more uniformly, which can achieve better light mixing effect, and the color gamut of the entire backlight module can also be improved. At the same time, in this embodiment, a reflective blocking wall 300 is also provided, and the reflective blocking wall 300 can reflect the light incident to the side back, thereby improving the light efficiency, and the luminous efficiency is higher under the same energy consumption, and the reflected light can continue to be Light mixing is performed to further improve the uniformity of light mixing. The reflective blocking wall 300 separates the light mixing unit 210 into two independent light mixing spaces, so that the light emitted by the LED chips 211 in different light mixing spaces will not affect each other, so the light mixing in each light mixing space can be controlled more accurately The effect is also beneficial to improve the light mixing uniformity of each light mixing space.

Any arrangement of the LED chips 211 that can meet the arrangement requirements of the LED chips 211 in the light mixing unit 210 can be applied to the solution of the present application. Exemplarily, the following describes intuitively the settings of the light mixing unit 210 with reference to FIGS. 3 to 8 . Please refer to FIG. 3. FIG. 3 is a schematic diagram of the first arrangement of the backlight sources 200 in the backlight module shown in FIG. 1. At this time, the three LED chips 211 in the upper row of the light mixing unit 210 are R (red). Light LED chips 211R)/B (blue LED chips 211B)/G (green LED chips 211G), and the three LED chips 211 in the next row are G/R/B. The green LED chips 211G in the next row face the position between the red LED chips 211R and the blue LED chips 211B in the previous row. At this time, the green LED chips 211G in the next row can be directly opposite the red LEDs in the previous row. The gap between the chip 211R and the blue LED chip 211B may also be partially located below the red LED chip 211R or the blue LED chip 211B in the previous row. The red LED chip 211R in the next row faces the position between the green LED chip 211G and the blue LED chip 211B in the previous row. At this time, the red LED chip 211R in the next row can be directly opposite the blue LED chip in the previous row. The gap between 211B and the green LED chip 211G may also be partially located below the blue LED chip 211B or the green LED chip 211G in the previous row. The green LED chip 211G in the upper row faces the part between the red LED chip 211R and the blue LED chip 211B in the next row. At this time, the green LED chip 211G in the upper row may be facing the red light in the next row. The gap between the LED chip 211R and the blue LED chip 211B may also be partially located above the red LED chip 211R or the blue LED chip 211B in the next row. At this time, the three LED chips 211 at one end of the light mixing unit 210 include a first row of red LED chips 211R, a first row of blue LED chips 211B and a second row of green LED chips 211G. The three LED chips 211 at the other end of the light mixing unit 210 include a first row of green LED chips 211G, a second row of red LED chips 211R, and a second row of blue LED chips 211B. Please refer to FIG. 4 . FIG. 4 is a schematic diagram of the second arrangement of the backlight sources 200 in the backlight module shown in FIG. 1 . At this time, the three LED chips 211 in the upper row of the light mixing unit 210 are B/R /G, the three LED chips 211 in the next row are G/B/R. The green LED chip 211G in the next row faces the position between the blue LED chip 211B and the red LED chip 211R in the previous row. At this time, the green LED chip 211G in the next row can be directly opposite the blue LED chip in the previous row. The gap between 211B and the red LED chip 211R may also be partially located below the blue LED chip 211B or the red LED chip 211R in the previous row. The blue LED chips 211B in the next row face the position between the red LED chips 211R and the green LED chips 211G in the previous row. At this time, the blue LED chips 211B in the next row can be directly opposite the red LED chips in the previous row. The gap between 211R and the green LED chip 211G may also be partially located below the red LED chip 211R or the green LED chip 211G in the previous row. The green LED chips 211G in the previous row face the part between the blue LED chips 211B and the red LED chips 211R in the next row. At this time, the green LED chips 211G in the previous row may be opposite to the blue LEDs in the next row. The gap between the chip 211B and the red LED chip 211R may also be partially located above the blue LED chip 211B or the red LED chip 211R in the next row. At this time, the three LED chips 211 at one end of the light mixing unit 210 include a first row of blue LED chips 211B, a first row of red LED chips 211R, and a second row of green LED chips 211G. The three LED chips 211 at the other end of the light mixing unit 210 include a first row of green LED chips 211G, a second row of blue LED chips 211B and a second row of red LED chips 211R. Please refer to FIG. 5 . FIG. 5 is a schematic diagram of a third arrangement of the backlight sources 200 in the backlight module shown in FIG. 1 . At this time, the three LED chips 211 in the upper row of the light mixing unit 210 are G/R /B, the three LED chips 211 in the next row are B/G/R. The blue LED chip 211B in the next row is facing the position between the green LED chip 211G and the red LED chip 211R in the previous row. At this time, the blue LED chip 211B in the next row can be the green LED chip facing the previous row. The gap between 211G and the red LED chip 211R may also be partially located below the green LED chip 211G or the red LED chip 211R in the previous row. The green LED chips 211G in the next row face the position between the red LED chips 211R and the blue LED chips 211B in the previous row. At this time, the green LED chips 211G in the next row can be directly opposite the red LEDs in the previous row. The gap between the chip 211R and the blue LED chip 211B may also be partially located below the red LED chip 211R or the blue LED chip 211B in the previous row. The blue LED chip 211B in the previous row faces the part between the green LED chip 211G and the red LED chip 211R in the next row. At this time, the blue LED chip 211B in the previous row may be facing the green LED in the next row. The gap between the chip 211G and the red LED chip 211R may also be partially located above the green LED chip 211G or the red LED chip 211R in the next row. At this time, the three LED chips 211 at one end of the light mixing unit 210 include a first row of green LED chips 211G, a first row of red LED chips 211R, and a second row of blue LED chips 211B. The three LED chips 211 at the other end of the light mixing unit 210 include a first row of blue LED chips 211B, a second row of green LED chips 211G, and a second row of red LED chips 211R. Please refer to FIG. 6 . FIG. 6 is a schematic diagram of a fourth arrangement of the backlight sources 200 in the backlight module shown in FIG. 1 . At this time, the three LED chips 211 in the upper row of the light mixing unit 210 are R/G /B, the three LED chips 211 in the next row are B/R/G. The blue LED chips 211B in the next row face the position between the red LED chips 211R and the green LED chips 211G in the previous row. At this time, the blue LED chips 211B in the next row can be directly opposite the red LED chips in the previous row. The gap between 211R and the green LED chip 211G may also be partially located below the red LED chip 211R or the green LED chip 211G in the previous row. The red LED chip 211R in the next row faces the position between the green LED chip 211G and the blue LED chip 211B in the previous row. At this time, the red LED chip 211R in the next row can be opposite the green LED in the previous row. The gap between the chip 211G and the blue LED chip 211B may also be partially located below the green LED chip 211G or the blue LED chip 211B in the previous row. The blue LED chips 211B in the previous row face the part between the red LED chips 211R and the green LED chips 211G in the next row. At this time, the blue LED chips 211B in the previous row can be directly opposite the red LEDs in the next row. The gap between the chip 211R and the green LED chip 211G may also be partially located above the red LED chip 211R or the green LED chip 211G in the next row. At this time, the three LED chips 211 at one end of the light mixing unit 210 include a first row of red LED chips 211R, a first row of green LED chips 211G, and a second row of blue LED chips 211B. The three LED chips 211 at the other end of the light mixing unit 210 include a first row of blue LED chips 211B, a second row of red LED chips 211R, and a second row of green LED chips 211G. Please refer to FIG. 7 . FIG. 7 is a schematic diagram of a fifth arrangement of the backlight sources 200 in the backlight module shown in FIG. 1 . At this time, the three LED chips 211 in the upper row of the light mixing unit 210 are B/G /R, the three LED chips 211 in the next row are R/B/G. The red LED chip 211R in the next row faces the position between the blue LED chip 211B and the green LED chip 211G in the previous row. At this time, the red LED chip 211R in the next row can be opposite the blue LED chip in the previous row. The gap between 211B and the green LED chip 211G may also be partially located below the blue LED chip 211B or the green LED chip 211G in the previous row. The blue LED chip 211B in the next row is facing the position between the green LED chip 211G and the red LED chip 211R in the previous row. At this time, the blue LED chip 211B in the next row can be the green LED chip facing the previous row. The gap between 211G and the red LED chip 211R may also be partially located below the green LED chip 211G or the red LED chip 211R in the previous row. The red LED chip 211R in the previous row faces the part between the blue LED chip 211B and the green LED chip 211G in the next row. At this time, the red LED chip 211R in the previous row may be the blue LED facing the next row. The gap between the chip 211B and the green LED chip 211G may also be partially located above the blue LED chip 211B or the green LED chip 211G in the next row. At this time, the three LED chips 211 at one end of the light mixing unit 210 include a first row of blue LED chips 211B, a first row of green LED chips 211G and a second row of red LED chips 211R. The three LED chips 211 at the other end of the light mixing unit 210 include a first row of red LED chips 211R, a second row of blue LED chips 211B and a second row of green LED chips 211G. Please refer to FIG. 8 . FIG. 8 is a schematic diagram of the sixth arrangement of the backlight sources 200 in the backlight module shown in FIG. 1 . At this time, the three LED chips 211 in the upper row of the light mixing unit 210 are G/B /R, the three LED chips 211 in the next row are R/G/B. The red LED chip 211R in the next row faces the position between the green LED chip 211G and the blue LED chip 211B in the previous row. At this time, the red LED chip 211R in the next row can be opposite the green LED in the previous row. The gap between the chip 211G and the blue LED chip 211B may also be partially located below the green LED chip 211G or the blue LED chip 211B in the previous row. The green LED chip 211G in the next row faces the position between the blue LED chip 211B and the red LED chip 211R in the previous row. At this time, the green LED chip 211G in the next row can be directly opposite the blue LED chip in the previous row. The gap between 211B and the red LED chip 211R may also be partially located below the blue LED chip 211B or the red LED chip 211R in the previous row. The red LED chip 211R in the previous row faces the part between the green LED chip 211G and the blue LED chip 211B in the next row. At this time, the red LED chip 211R in the previous row may be facing the green LED chip in the next row. The gap between the LED chip 211G and the blue LED chip 211B may also be partially located above the green LED chip 211G or the blue LED chip 211B in the next row. At this time, the three LED chips 211 at one end of the light mixing unit 210 include a first row of green LED chips 211G, a first row of blue LED chips 211B and a second row of red LED chips 211R. The three LED chips 211 at the other end of the light mixing unit 210 include a first row of red LED chips 211R, a second row of green LED chips 211G, and a second row of blue LED chips 211B. The above-mentioned six configuration modes of the light mixing units 210 can all meet the requirements of the embodiments of the present application, achieve the purpose of improving the light mixing effect, and at the same time improve the color gamut of the entire backlight module.

The LED chip 211 in the backlight module provided by the embodiment of the present application may be an ordinary size LED chip 211 or a Mini LED chip 211 with a width of 20-500 μm. No matter which specification of the LED chip 211 is used, the LED chip 211 can be used to a certain extent. Improving the light mixing uniformity of the corresponding backlight module can also play a role in improving the color mixing effect. Compared with the traditional LED chip 211, the Mini LED chip 211 is smaller in size, and the arrangement design of the LEDs is more critical. Therefore, when the LED chip 211 in the backlight module provided by the embodiment of the present application is the Mini LED chip 211, the effect is particularly effective. Significantly.

When the LED chips 211 are Mini LED chips 211, the distance between two adjacent LED chips 211 in the light mixing unit 210 should not be too far. Exemplarily, two adjacent LED chips in the light mixing unit 210 The spacing between 211 is 20-500 μm. In actual operation, the distance between two adjacent LED chips 211 can be selected according to the specific specifications and light mixing requirements of the LED chips 211 , which is not specifically limited here. By adjusting the distance between two adjacent LED chips 211, different light mixing effects can be achieved as required.

Referring further to FIG. 1 , in order to improve the uniformity of light mixing, a triangle formed by connecting the three LED chips 211 at one end of the light mixing unit 210 may be arranged to be connected with the three LED chips 211 at the other end of the light mixing unit 210 . The triangles formed by connecting the LED chips 211 are congruent. At this time, the three LED chips 211 at one end of the light mixing unit 210 and the three LED chips 211 at the other end have a symmetrical arrangement, and their emission colors and positions have a certain complementary effect, which can further improve the light mixing. uniformity.

The uniformity of light mixing can also be improved by controlling the distance between the LED chips 211 . For example, please refer to FIG. 1 . The triangle formed by connecting the three LED chips 211 at one end of the light mixing unit 210 is isosceles. A triangle or an equilateral triangle; at this time, the distances between the three LED chips 211 are partially the same or completely the same, and the light mixing effect of the three LED chips 211 at one end of the light mixing unit 210 will be further improved. Certainly, the triangle formed by the connecting lines of the three LED chips 211 at the other end of the light mixing unit 210 may also be set as an isosceles triangle or an equilateral triangle. Similarly, at this time, the light mixing effect of the three LED chips 211 at the other end of the light mixing unit 210 will be further improved.

Wherein, the reflective blocking wall 300 is an adhesive layer mixed with highly reflective materials. The highly reflective material may be a reflective material commonly used in backlight modules such as titanium dioxide, the adhesive layer is generally white silica gel, and the adhesive layer mixed with the highly reflective material is formed on the substrate 100 by dispensing or printing.

The reflective blocking walls 300 surrounding the three LED chips 211 in the light mixing unit 210 enclose an independent light mixing space, the shape of which can be selected according to the needs of light mixing, for example, the shape can be Hexagons, trapezoids, triangles or irregular polygons, etc. Please further refer to FIG. 1 and FIG. 2 , in this embodiment, the shape of the reflective blocking walls 300 surrounding the three LED chips 211 in the light mixing unit 210 is a rectangle, and the light mixing space of each rectangle is a rectangle. are the same size, so a more uniform light mixing effect can be achieved.

Referring to FIG. 2 , in order to obtain a better light mixing effect, the height of the reflective blocking wall 300 may be set to be greater than the height of the LED chip 211 . At this time, the light can be concentrated in the respective independent light mixing spaces, which reduces the mutual interference of the LED chips 211 in different light mixing spaces, and ensures a better light mixing effect.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

In the description of this application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more features. The backlight modules provided by the embodiments of the present application have been introduced in detail above, and the principles and implementations of the present application are described with specific examples. At the same time, for those skilled in the art, according to the idea of the application, there will be changes in the specific implementation and application scope. In conclusion, the content of this specification should not be construed as a limitation to the application.

Claims (9)

1. A backlight module, comprising:

a substrate;

the backlight source is arranged on the substrate and comprises a plurality of light mixing units arranged in an array manner, each light mixing unit comprises two rows of LED chips arranged in a staggered manner, and each row of LED chips comprises a red LED chip, a green LED chip and a blue LED chip; the light emitting color of any one LED chip in the light mixing unit is different from the light emitting colors of all the adjacent LED chips;

the light-reflecting retaining wall, the light-reflecting retaining wall set up in on the base plate, the light-reflecting retaining wall encircles mix the light unit and will mix in the light unit three of one end the LED chip separates with the three of other one end the LED chip.

2. The backlight module as claimed in claim 1, wherein the width of the LED chip is 20-500 μm.

3. The backlight module as claimed in claim 2, wherein the distance between two adjacent LED chips in the light mixing unit is 20-500 μm.

4. The backlight module according to any of claims 1 to 3, wherein a triangle formed by connecting lines of three LED chips at one end of the light mixing unit is equal to a triangle formed by connecting lines of three LED chips at the other end of the light mixing unit.

5. The backlight module according to any of claims 1 to 3, wherein a triangle formed by connecting lines of the three LED chips at one end of the light mixing unit is an isosceles triangle or an equilateral triangle; and/or the presence of a gas in the atmosphere,

and a triangle formed by connecting lines of the three LED chips at the other end of the light mixing unit is an isosceles triangle or an equilateral triangle.

6. The backlight module as claimed in claim 1, wherein the light-reflecting walls are glue layers mixed with high-reflection materials.

7. The backlight module as claimed in claim 1, wherein the reflecting walls surrounding the three LED chips in the light mixing unit are rectangular, circular, hexagonal, trapezoidal, triangular or irregular polygonal.

8. The backlight module as claimed in claim 1, wherein the height of the reflective wall is greater than that of the LED chip.

9. A display panel comprising a backlight module according to any one of claims 1-8.

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