RGBW full-spectrum backlight module

Abstract

The utility model discloses a RGBW full spectrum backlight module, include: backboard, backboard is equipped with accommodation space, substrate, substrate is placed in accommodation space, a plurality of light emitting units, a plurality of light emitting units are equipped with the one side of substrate away from backboard, and every light emitting unit includes red light LED, green light LED, blue light LED and white light LED, reflection dam, reflection dam is equipped with the circumferential side of red light LED, green light LED, blue light LED and white light LED, optical element, optical element is placed in accommodation space and is located the top of light emitting unit and reflection dam. The light emitting unit of this backlight module includes red, green, blue, white four color light source, and the reflection effect of cooperation reflection dam can show the full spectrum light emitting effect of backlight module and the full spectrum display effect of display device, thereby improve display brightness, and the color is richer, and the stereoscopic color domain is wider, and the color rendering index and spectrum continuity are better, and simultaneously are favorable for reducing blue light harm, reach the eye protection effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid crystal display, and particularly relates to an RGBW full-spectrum backlight module. Background Art

[0002] A backlight module is a device that provides light source located at the rear side of a display, and the luminous effect of the backlight module is directly related to the display effect of the display. In the current display industry, the liquid crystal display technology based on Mini LED backlight has emerged unexpectedly. As a transition technology for Micro LED, it can not only make up for many deficiencies of the existing liquid crystal display technology, but also has cost advantages and local performance advantages that can directly compete with OLED in high-end fields, especially in large-size products. Due to the small size of Mini LED chips, higher-precision multi-zone backlight control can be adopted, thereby achieving a HDR (High Dynamic Range) display effect with better visual perception.

[0003] In a Mini LED backlight module, one light-emitting unit is generally composed of R (red), G (green), and B (blue) chips to form full-color pixels, which can present millions of colors, thereby bringing people richer and more real color experience. However, the brightness of an RGB display completely depends on the mixing of three primary color lights, and the three-primary-color white light can only be synthesized when the red, green and blue lights emit light simultaneously, which leads to high energy consumption and low brightness. Summary of the Utility Model

[0004] The object of the present utility model is to disclose an RGBW full-spectrum backlight module, which has the characteristics of high brightness and low energy consumption.

[0005] In order to achieve the above object, the present utility model discloses an RGBW full-spectrum backlight module, comprising: a back plate, wherein the back plate is provided with an accommodation space; a substrate, wherein the substrate is arranged in the accommodation space; a plurality of light-emitting units, wherein the plurality of light-emitting units are arranged on a side of the substrate facing away from the back plate, and each light-emitting unit comprises a red light LED, a green light LED, a blue light LED and a white light LED; a reflective dam, wherein the reflective dam is arranged on the peripheral sides of the red light LED, the green light LED, the blue light LED and the white light LED; an optical element, wherein the optical element is arranged in the accommodation space and located above the light-emitting units and the reflective dam.

[0006] As an alternative embodiment, the red light LED, the green light LED, the blue light LED and the white light LED are distributed in a square area with equal spacing and adjacent to each other in pairs, and the reflective dam is arranged around the peripheral sides of the red light LED, the green light LED, the blue light LED and the white light LED of each light-emitting unit to form a "field"-shaped structure.

[0007] As an optional implementation, the red LED includes a first blue LED chip and a red phosphor layer, wherein the red phosphor layer is disposed on the first blue LED chip; The green LED includes a second blue LED chip and a green phosphor layer, with the green phosphor layer disposed on the second blue LED chip; Blue LEDs include a third blue LED chip and a transparent phosphor layer, with the transparent phosphor layer disposed on the third blue LED chip; A white LED includes a fourth blue LED chip and a yellow phosphor layer, with the yellow phosphor layer disposed on the fourth blue LED chip.

[0008] As an optional implementation, the red fluorescent layer, green fluorescent layer, transparent fluorescent layer and yellow fluorescent layer are all convex lens structures, and are respectively covered on the side of the first blue LED chip, the second blue LED chip, the third blue LED chip and the fourth blue LED chip away from the substrate.

[0009] As an alternative implementation, the red phosphor layer is formed by dotting red phosphor lens adhesive on the side of the first blue LED chip away from the substrate. The green phosphor layer is formed by applying green phosphor lens adhesive to the side of the second blue LED chip away from the substrate. The transparent phosphor layer is formed by applying transparent phosphor lens adhesive to the side of the third blue LED chip facing away from the substrate; The yellow phosphor layer is formed by applying yellow phosphor lens adhesive to the side of the fourth blue LED chip facing away from the substrate.

[0010] As an alternative implementation, the reflective dam is formed by applying dam adhesive to the periphery of red LEDs, green LEDs, blue LEDs and white LEDs.

[0011] As an optional implementation, a reflector is provided on the side of the substrate away from the back plate. The reflector includes multiple reflective cups, the number of which is equal to the number of light-emitting units and their positions correspond one-to-one. The light-emitting units and their surrounding reflective dams are located in the corresponding reflective cups.

[0012] As an optional implementation, the side of the reflector cup closest to the light-emitting unit is a reflective wall, which is inclined and the end of the reflective wall corresponding to the substrate is closer to the light-emitting unit than the other end.

[0013] As an optional implementation, multiple AM ​​driver chips are provided on the side of the substrate away from the back plate, and the AM driver chips and the light-emitting unit are electrically connected to the control module.

[0014] As an optional implementation, the AM driver chip is packaged on a substrate via a CSP and located between multiple light-emitting units, with the AM driver chip and the light-emitting units on the same plane.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The backlight module of this utility model includes four color light sources: red, green, blue, and white. Combined with the reflection effect of the reflective dam, it can display the full spectrum light output effect of the backlight module and the full spectrum display effect of the display device, thereby improving the display brightness, enriching the colors, widening the three-dimensional color gamut, and improving the color rendering index and spectral continuity. At the same time, it helps to reduce the harm of blue light and achieve the effect of eye protection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of the RGBW full-spectrum backlight module of this utility model; Figure 2 This is a schematic diagram of the combined structure of the light-emitting unit, the reflective dam, and the reflector of this utility model; Figure 3 This is a schematic diagram of the structure of the light-emitting unit, the reflective dam, and the reflector of this utility model.

[0018] Explanation of key figure labels: 1. Backplate; 2. Light-emitting unit; 21. Red LED; 211. First blue LED chip; 212. Red phosphor layer; 22. Green LED; 221. Second blue LED chip; 222. Green phosphor layer; 23. Blue LED; 231. Third blue LED chip; 232. Transparent phosphor layer; 24. White LED; 241. Fourth blue LED chip; 242. Yellow phosphor layer; 3. Reflective dam; 4. Reflector; 41. Reflective cup; 411. Reflective wall. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0025] Please see Figure 1-3 As shown, this application embodiment provides an RGBW full-spectrum backlight module, including: a back plate 1, a substrate, multiple light-emitting units 2 and optical elements. The back plate 1 is provided with an accommodating space, the substrate is disposed in the accommodating space, the multiple light-emitting units 2 are disposed on the side of the substrate away from the back plate 1, and the optical elements are placed in the accommodating space and located above the light-emitting units 2.

[0026] The backplate 1 has a semi-enclosed structure to form an accommodating space. The substrate is fixed to the accommodating space by double-sided adhesive. The light-emitting unit 2 is fixed on the substrate to provide light emission. The optical element is located above the light-emitting unit 2. The optical element includes at least one of the following: diffusion film, anti-red-green film, quantum dot film, beam splitting film, lower brightness enhancement film, and upper brightness enhancement film, which are used to improve the light emission effect of the backlight module.

[0027] Based on this structure, the light-emitting unit 2 in this embodiment includes a red LED 21, a green LED 22, a blue LED 23, and a white LED 24. A reflective dam 3 surrounds the red LED 21, green LED 22, blue LED 23, and white LED 24, and the optical element is located above the light-emitting unit 2 and the reflective dam 3. That is, the light-emitting unit 2 in this embodiment emits light across the entire RGBW spectrum, and the reflective effect of the reflective dam 3 enhances the light output of the backlight module.

[0028] In conventional technology, the light-emitting unit 2 includes a red LED 21, a green LED 22, and a blue LED 23, i.e., RGB three-color light emission. Compared with the RGBW full-spectrum light emission of this application, it has the following drawbacks. RGB displays suffer from weaker brightness and loss of detail in dark areas: RGB displays rely entirely on the mixing of the three primary colors of light for brightness. White light requires the simultaneous emission of red, green, and blue light (e.g., white light = R + G + B), leading to higher energy consumption and a lower peak brightness compared to RGBW displays. For example, when displaying a white background, RGBW display pixels can emit light directly without the need for the three primary colors to be superimposed, resulting in higher brightness. In contrast, RGB displays require all three primary colors to operate at full capacity, limiting brightness and potentially causing blurred details in dark scenes (such as night scenes and shadows) due to insufficient light intensity. The challenge of balancing color purity and contrast: To increase brightness, RGB displays may be forced to increase the luminous intensity of the three primary colors, easily leading to oversaturation or color cast (such as overly bright red appearing "glaring"), thus reducing color accuracy. Regarding contrast, RGB displays need to completely turn off the three primary color pixels when displaying black, but due to hardware limitations (such as backlight leakage), black can easily appear "grayish." In contrast, the white pixels of RGBW can be adjusted independently; by reducing the brightness of white pixels in conjunction with turning off the three primary colors, darker colors can be presented more accurately, improving contrast. Low energy efficiency and high heat generation and battery life pressure: Because RGB displays rely on mixing the three primary colors to produce white light, their energy consumption is higher than that of RGBW displays at the same brightness (the white pixels in RGBW have higher luminous efficiency). This drawback is particularly noticeable in mobile devices (such as mobile phones and tablets). Under the same usage time, RGB displays will consume more power, and at the same time, due to the heavy load on the light-emitting elements, they are more likely to generate more heat, affecting the stability of device performance. Display performance is limited in low-light environments: In low-brightness scenes, the three primary color pixels of an RGB display need to reduce their light intensity, which may lead to color separation or striping (especially on low-resolution screens), resulting in a decrease in image detail. However, the white pixels of RGBW can take on some of the brightness output in low light, reducing the light emission pressure on the three primary colors and making the image more uniform and softer.

[0029] In conclusion, by adding white pixels, RGBW achieves optimization in terms of brightness, energy efficiency, contrast, etc., and is particularly suitable for scenarios that have requirements for outdoor visibility (such as screens under direct sunlight) and battery life (such as mobile devices). The defect of RGB is essentially a limitation brought by the "omni-functionality of three primary colors"—it needs to undertake both color and brightness tasks, making it difficult to achieve balance in multi-dimensional performance. In the embodiments of the present application, the light-emitting unit 2 composed of red LEDs 21, green LEDs 22, blue LEDs 23 and white LEDs 24 cooperates with multiple reflections of the reflection dam 3, which can present the full-spectrum light output effect of the backlight module and the full-spectrum display effect of the display device, thereby increasing the display brightness, delivering richer colors, a wider three-dimensional color gamut, better color rendering index and spectral continuity, while helping to reduce blue light hazard and achieve an eye-protecting effect.

[0030] Wherein, the red LEDs 21, green LEDs 22, blue LEDs 23 and white LEDs 24 are equally spaced and adjacent to each other in a square area, and the reflection dam 3 is arranged around the sides of the red LEDs 21, green LEDs 22, blue LEDs 23 and white LEDs 24 of each light-emitting unit 2 to form a "field-shaped" structure. The light-emitting unit 2 is divided into four small matrix blocks, which cooperate with the reflection dam 3 of the "field-shaped" structure, and can increase the light mixing area and brightness while enhancing the reflection effect and light output uniformity.

[0031] The red LED 21 includes a first blue LED die 211 and a red fluorescent layer 212, and the red fluorescent layer 212 is disposed on the first blue LED die 211; the green LED 22 includes a second blue LED die 221 and a green fluorescent layer 222, and the green fluorescent layer 222 is disposed on the second blue LED die 221; the blue LED 23 includes a third blue LED die 231 and a transparent fluorescent layer 232, and the transparent fluorescent layer 232 is disposed on the third blue LED die 231; the white LED 24 includes a fourth blue LED die 241 and a yellow fluorescent layer 242, and the yellow fluorescent layer 242 is disposed on the fourth blue LED die 241. The generation of red light, green light, blue light and white light is all realized based on blue LED dies with appropriate fluorescent layers, which is convenient for processing and production, and can reduce the hazard of blue light to achieve the purpose of eye protection.

[0032] The red phosphor layer 212, green phosphor layer 222, transparent phosphor layer 232, and yellow phosphor layer 242 are all convex lens structures, and are respectively disposed on the side of the first blue LED chip 211, the second blue LED chip 221, the third blue LED chip 231, and the fourth blue LED chip 241 facing away from the substrate. The lens structure of the red phosphor layer 212, green phosphor layer 222, transparent phosphor layer 232, and yellow phosphor layer 242 helps to improve the refraction of light emitted from the light-emitting unit 2, allowing more light to reach the reflective dam 3, thereby improving the reflection effect and increasing the brightness and uniformity of the emitted light.

[0033] The red phosphor layer 212 is formed by applying red phosphor lens adhesive to the side of the first blue LED chip 211 facing away from the substrate; the green phosphor layer 222 is formed by applying green phosphor lens adhesive to the side of the second blue LED chip 221 facing away from the substrate; the transparent phosphor layer 232 is formed by applying transparent phosphor lens adhesive to the side of the third blue LED chip 231 facing away from the substrate; and the yellow phosphor layer 242 is formed by applying yellow phosphor lens adhesive to the side of the fourth blue LED chip 241 facing away from the substrate. In this embodiment, by applying phosphor lens adhesive of corresponding colors, the refraction and reflectivity of light are increased while ensuring four-color light emission, thereby enhancing the light emission effect.

[0034] The reflective dam 3 is formed by applying a damming adhesive around the periphery of the red LED 21, green LED 22, blue LED 23, and white LED 24. The damming adhesive has a high reflectivity, which is beneficial for high light reflection and enhances the light emission effect.

[0035] Based on the above structure, a reflector 4 is provided on the side of the substrate away from the back plate 1. The reflector 4 includes multiple reflector cups 41, the number of which is equal to the number of light-emitting units 2 and their positions correspond one-to-one. The light-emitting units 2 and their surrounding reflective dams 3 are disposed within the corresponding reflector cups 41. The light emitted by the light-emitting units 2 undergoes a first layer of reflection after being reflected by the reflective dams 3, and then reaches the reflector cups 41 for a second layer of reflection, which can further improve the uniformity of light emission and brightness.

[0036] The side of the reflector cup 41 closest to the light-emitting unit 2 is a reflective wall 411. The reflective wall 411 is inclined, and one end of the reflective wall 411 is closer to the light-emitting unit 2 than the other end. The reflector 4 can be formed by processes such as vacuum forming and injection molding, and it is bonded to the substrate. The reflector cup 41 houses the corresponding light-emitting unit 2 and the reflective dam 3, and the optical element is located above the reflector 4. The reflective wall 411 of the reflector cup 41 is inclined. The light emitted by the light-emitting unit 2 reaches the reflective wall 411 after being refracted by the lens structure and reflected by the first layer of the reflective dam 3. The inclined reflective wall 411 can further disperse the light, thereby improving the uniformity of light output while ensuring brightness.

[0037] In addition, multiple AM ​​driver chips are located on the side of the substrate away from the backplate 1. Both the AM driver chips and the light-emitting units 2 are electrically connected to the control module. The AM driver chips are arranged in a matrix on the substrate, which can be controlled independently in different zones. The low blue light setting of the light-emitting units 2, combined with active AM zone driving control, can effectively alleviate the screen door effect of light emission, improve contrast, refresh rate and brightness. Combined with HDR function, it can better meet the ultra-high-definition image quality requirements of the display screen, avoid the flicker damage caused by traditional driving, and achieve the effect of eye protection.

[0038] The AM driver chip is packaged on the substrate via a CSP and located between multiple light-emitting units 2, with the AM driver chip and the light-emitting units 2 on the same plane. The AM driver chip and the light-emitting units 2 being on the same plane on the substrate facilitates the achievement of an ultra-thin backlight module, saving space. This embodiment uses a single-layer substrate, saving product design space, further improving the product's thinness, integrated light control, and high luminous efficiency, increasing manufacturing efficiency, reducing material costs, and also featuring lightweight characteristics.

[0039] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An RGBW full-spectrum backlight module, characterized in that, Comprising: a backboard provided with an accommodation space; a substrate disposed in the accommodation space; a plurality of light emitting units, wherein the plurality of light emitting units are arranged on a side of the substrate facing away from the backboard, and each light emitting unit comprises a red LED, a green LED, a blue LED and a white LED; a reflective dam arranged on the peripheral sides of the red LED, the green LED, the blue LED and the white LED; an optical element disposed in the accommodation space and located above the light emitting units and the reflective dam.

2. The RGBW full-spectrum backlight module according to claim 1, characterized in that: The red LED, the green LED, the blue LED and the white LED are distributed at equal intervals in a square area with every two adjacent to each other, and the reflective dam is arranged around the peripheral sides of the red LED, the green LED, the blue LED and the white LED of each light emitting unit to form a "field" shaped structure.

3. The RGBW full-spectrum backlight module according to claim 1 or 2, characterized in that: The red LED comprises a first blue LED die and a red fluorescent layer, wherein the red fluorescent layer is arranged on the first blue LED die; The green LED comprises a second blue LED die and a green fluorescent layer, wherein the green fluorescent layer is arranged on the second blue LED die; The blue LED comprises a third blue LED die and a transparent fluorescent layer, wherein the transparent fluorescent layer is arranged on the third blue LED die; The white LED comprises a fourth blue LED die and a yellow fluorescent layer, wherein the yellow fluorescent layer is arranged on the fourth blue LED die.

4. The RGBW full-spectrum backlight module according to claim 3, characterized in that: The red fluorescent layer, the green fluorescent layer, the transparent fluorescent layer and the yellow fluorescent layer are all of a convex lens structure, and are respectively covered on a side of the first blue LED die, the second blue LED die, the third blue LED die and the fourth blue LED die facing away from the substrate.

5. The RGBW full-spectrum backlight module according to claim 4, characterized in that: The red fluorescent layer is formed by dotting red phosphor lens glue on a side of the first blue LED die facing away from the substrate; The green fluorescent layer is formed by dotting green phosphor lens glue on a side of the second blue LED die facing away from the substrate; The transparent fluorescent layer is formed by dotting transparent phosphor lens glue on a side of the third blue LED die facing away from the substrate; The yellow fluorescent layer is formed by dotting yellow phosphor lens glue on a side of the fourth blue LED die facing away from the substrate.

6. The RGBW full-spectrum backlight module according to claim 1 or 2, characterized in that: The reflective dam is formed by dotting dam glue on the peripheral sides of the red LED, the green LED, the blue LED and the white LED.

7. The RGBW full-spectrum backlight module according to claim 1, characterized in that: A side of the substrate facing away from the backboard is provided with a reflector, the reflector comprises a plurality of reflection cups, the number of the reflection cups is equal to that of the light emitting units and the positions of the reflection cups are in one-to-one correspondence, and the light emitting units and the reflective dam on the peripheral sides thereof are arranged in the corresponding reflection cups.

8. The RGBW full-spectrum backlight module according to claim 7, characterized in that: A side of the reflection cup close to the light emitting unit is a reflection wall, the reflection wall is arranged in an inclined manner, and one end of the reflection wall corresponding to the substrate is arranged closer to the light emitting unit than the other end thereof.

9. The RGBW full-spectrum backlight module according to claim 1, characterized in that: The substrate has multiple AM ​​driver chips on the side opposite to the back plate, and the AM driver chips and the light-emitting unit are electrically connected to the control module.

10. The RGBW full-spectrum backlight module according to claim 9, characterized in that: The AM driver chip is packaged on the substrate via a CSP and is located between the multiple light-emitting units, with the AM driver chip and the light-emitting units on the same plane.

Images