CN112099122A - Filter film and display device - Google Patents

Abstract

The invention discloses a filter film and a display device, wherein the filter film comprises a plurality of filter units which are arranged in an array, and each filter unit comprises a red filter area, a green filter area, a blue filter area, a red-green overlapping area, a green-blue overlapping area and a blue-red overlapping area. Three overlapped areas are respectively formed in the filter film by overlapping the filter layers with two colors and are used as pixel intervals, and the three overlapped areas are matched on the white light LED device, so that the full colorization of the white light LED device can be realized.

Description

Filter film and display device

technical field

The invention belongs to the technical field of semiconductor display, and particularly relates to a filter film and a display device.

Background technique

The current commercial application of LED (Light Emitting Diode) is relatively common. In the prior art, the LED array full-color solutions mainly include the following:

The first scheme, UV LED (ultraviolet LED) or blue LED combined with quantum dot method to achieve full color. Due to the shortcomings of quantum dot technology, such as poor material stability, high requirements for heat dissipation, the need for sealing, and short life, mass production cannot be achieved.

The second scheme, UV LED (ultraviolet LED) or blue LED combined phosphor method to achieve full color. Since the phosphor needs further light absorption and conversion, it will affect the overall response rate and light efficiency of the device, and because the size of the phosphor particles is large, about 1-10 microns, as the size of the LED pixel continues to decrease, the phosphor Powder coating becomes more uneven and affects display quality.

The third solution is to increase the coverage area of the light-emitting wavelength band by controlling the doping ratio of the material growth of the quantum well layer in the LED, and control the current of different levels to achieve full-color light-emitting. But at present, this technology HIA cannot guarantee the stable working performance of the device. Therefore, use is limited.

The fourth solution is realized by RGB monochromatic LED device splicing technology, but this technology is limited by the equipment used in the splicing technology and is not yet mature at present.

The fifth scheme, the white LED is combined with a black matrix (Black Matrix) filter film (shown in Figure 1) technology (Color Filter) to achieve full color. Since the light emitted by the white LED 80 has multiple directions, the light emitted in the non-display direction adjacent to the black matrix layer 91 will be absorbed by the BM because the black matrix layer has certain light absorption properties. , the brightness of the chip is reduced, which in turn affects the luminous efficiency of the device.

Therefore, it is indeed necessary to continuously develop a full-color LED array solution to overcome the defects of the prior art.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, an object of the present invention is to provide a filter film that is simple to manufacture and has good filter effect. Another object of the present invention is to provide a display device provided with the filter film.

In order to achieve one object of the above invention, one aspect of the present invention adopts the following technical solution: a filter film, comprising a plurality of filter units arranged in an array, each of the filter units includes a filter that allows a wavelength of a first wavelength band A red filter area that transmits light, a green filter area that allows light with wavelengths of the second wavelength band to pass, a blue filter area that allows light with wavelengths of the third wavelength band to pass, red-green overlap, green A blue overlapping area and a blue-red overlapping area, the red-green overlapping area is formed by overlapping a part of the red filter area and a part of the green filter area and is used to isolate the adjacent red filter areas and The green filter area, the green-blue overlap area is formed by overlapping a part of the green filter area and a part of the blue filter area, and is used to isolate the adjacent green filter area and all The blue filter area, the blue-red overlapping area is formed by overlapping a part of the blue filter area and a part of the red filter area and is used to isolate the adjacent blue filter areas and The red filter area, the red-green overlapping area only allows the light of the wavelength of the overlapping wavelength band of the first wavelength band and the second wavelength band to pass, and the green-blue overlapping area only allows the overlap of the second wavelength band and the third wavelength band. The light of the wavelength of the wavelength band passes through, and the blue-red overlapping area only allows the light of the wavelength of the overlapping wavelength band of the first wavelength band and the third wavelength band to pass.

A preferred solution of the above technical solution is: in the red-green overlapping area, the red filter area is arranged above or below the green filter area.

A preferred solution of the above technical solution is: in the green-blue overlapping area, the green filter area is arranged above or below the blue filter area.

A preferred solution of the above technical solution is: in the blue-red overlapping area, the blue filter area is arranged above or below the red filter area.

A preferred solution of the above technical solution is: the first waveband is between 500nm and 780nm, the second waveband is between 440nm and 600nm, and the red-green overlap region only allows wavelengths between 500nm and 600nm. Light between 600nm passes through.

A preferred solution of the above technical solution is: the first wavelength band is between 500 nm and 740 nm, the third wavelength band is between 380 nm and 490 nm, and the blue-red overlapping area constitutes a light impermeable area.

A preferred solution of the above technical solution is: the first waveband is between 440nm and 600nm, the third waveband is between 380nm and 490nm, and the green-blue overlap area is configured to allow only wavelengths between Light between 440nm and 490nm passes.

A preferred solution of the above technical solution is that the areas of the red filter region, the green filter region and the blue filter region are all equal.

A preferred solution of the above technical solution is: the red-green overlapping area, the green-blue overlapping area, and the blue-red overlapping area are all equal.

In order to achieve another object of the above invention, another aspect of the present invention adopts the following technical solution: a display device, comprising a plurality of white LEDs arranged in an array and the filter film in the above technical solution, each of the filter units It covers the light-emitting surfaces of the three white LEDs and forms a pixel unit.

Wherein, the white light LE is preferably OLED or Micro-LED.

Compared with the prior art, the present invention obtains the following beneficial effects: the present invention forms an overlapping area by overlapping the filter areas of two colors, and the overlapping area can be used as a "pixel interval", and the structure is simple, the process is simple, and it is easy to realize High consistency of light-emitting wavelengths of the same color; when the filter film of the solution of the present invention is arranged on one side of the light-emitting surface of the white light LED, it can easily realize the full color of the white light array.

Description of drawings

1 is a schematic diagram of the light path of a single pixel unit in a display device that uses white LEDs in combination with a filter film with a black matrix to achieve full-color display in the prior art;

2 is a schematic structural diagram of a single pixel unit in a display device that uses a white LED combined filter film to achieve full color according to an embodiment of the present invention;

3 is a schematic diagram of a light path of a single pixel unit in a display device using a white light LED combined filter film to achieve full color according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a light path of a single pixel unit in a display device using a white LED combined filter film to achieve full color according to another embodiment of the present invention.

Detailed ways

In order to describe the technical content, structural features, achieved objects and effects of the invention in detail, the following will be described in detail with reference to the embodiments and the accompanying drawings. In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be practiced without these specific details or with one or more equivalent arrangements. Furthermore, the various exemplary embodiments may vary, but are not necessarily exclusive. For example, the specific shapes, configurations, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

Unless otherwise stated, the illustrated exemplary embodiments are to be understood as providing exemplary features that provide various details of some ways in which the inventive concepts may be implemented in practice. Thus, unless otherwise stated, features, components, modules, layers, films, panels, regions and/or aspects, etc. of different embodiments may be additionally combined, separated, interchanged and/or without departing from the inventive concept. rearrange.

For descriptive purposes, terms such as "under", "under", "under", "under", "above", "on", "at" may be used herein. Spatially relative terms such as "above", "higher", "side" (eg, as in "sidewall"), etc., to describe one element from another (other) as shown in the figures element relationship. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. In addition, the device may be otherwise oriented (eg, rotated 90 degrees or at other orientations) and, as such, the spatially relative descriptors used herein should be interpreted accordingly.

The invention discloses a display panel that realizes full color by combining white light LED filter films, and its structure can be applied to Micro-LED, OLED and the like. In this embodiment, the display device is a silicon-based color micro-LED display device.

Please refer to FIG. 2 , the color micro-display device includes: a plurality of white LEDs 10 arranged in an array and a filter film 20 (also referred to as a filter thin layer), and the filter film 20 includes a plurality of filters arranged in an array unit. Each filter unit covers the light emitting surface of the three white LEDs 10 and constitutes a pixel unit 100 . The white light LED 10 can excite different intensities of white light based on control conditions. The filter film 20 can filter the white light emitted by the white LED 10 for red light, green light and blue light, so as to finally present a desired color image.

Each filter unit includes a red filter region 21 that allows light having a wavelength of the first wavelength band to pass through, a green filter region 22 that allows light having a wavelength of the second The blue filter area 23 , the red-green overlapping area 24 , the green-blue overlapping area 25 and the blue-red overlapping area 26 through which the light rays pass. In this example, the red filter area 21 , the red-green overlapping area 24 , the green filter area 22 , the green-blue overlapping area 25 , the blue filter area 23 are arranged in sequence, and the blue-red overlapping area 26 is arranged in sequence. In order to increase the uniformity of the light emitted from the filter film 20 , the areas of the red filter region 21 , the green filter region 22 and the blue filter region 23 in this example are all the same. The areas of the red-green overlapping region 24 , the green-blue overlapping region 25 , and the blue-red overlapping region 26 are all equal.

The red and green overlapping area 24 is formed by overlapping part of the red filter area 21 and part of the green filter area 22 and is used to isolate the adjacent red filter area 21 and green filter area 22; the red and green overlapping area 24 only allows the first Light of the wavelength of the overlapping band of the first band and the second band passes.

The green-blue overlapping area 25 is formed by overlapping part of the green filter area 22 and part of the blue filter area 23 and is used to isolate the adjacent green filter area 22 and the blue filter area 23. The green-blue overlapping area 25 is only Light of wavelengths of the overlapping wavelength bands of the second and third wavelength bands is allowed to pass.

The blue-red overlapping area 26 is formed by overlapping part of the blue filter area 23 and part of the red filter area 21 and is used to isolate the adjacent blue filter area 23 and red filter area 21. The blue-red overlapping area 26 is only Light of wavelengths of overlapping bands of the first band and the third band is allowed to pass.

In this way, the blue light, red light and green light emitted from each pixel unit 100 will not interfere with each other, and rich color changes can be presented through control. Full color.

When designing three overlapping area structures according to the above technical solutions, two effects can be achieved by designing and selecting the transmittable light wavelengths of the three RGB filter layers, specifically:

In the first solution, when designing the blue filter area, the green filter area, and the red filter area, the wavelength bands that can project light in the three filter areas can be designed to partially overlap. As shown in FIG. 3 , in the filter film 40 of the pixel unit 300 , each filter unit includes a red filter area 41 that allows light with a wavelength range of 500 nm to 780 nm to penetrate, and a wavelength range of 440 nm to 600 nm. The green filter area 42 through which the light penetrates, and the blue filter area 43 which allows the penetration of light with a wavelength range of 380 nm to 490 nm. In this way, the red-green overlapping area 44 will only allow the passage of wavelengths between 500 nm and 600 nm, the green-blue overlapping area 46 will only allow the passing of wavelengths between 440 nm and 490 nm, and the blue-red overlapping area 45 constitutes light impermeability. cross area. When the three white light LEDs 30 all emit light, the white light passes through the red filter area 41 , the green filter area 42 and the blue filter area 43 to present blue light, red light and green light respectively, and passes through the red and green overlapping area 44 and the green and blue light. The overlapping region 45 only emits yellow light and cyan light with a narrow wavelength range, respectively, and since the blue-red overlapping region 46 is a light non-transmitting region, no light is emitted here.

The filter film designed according to this scheme displays the overlapping light color in the overlapping area next to each pure color light. According to the light transmittance at the overlap, corresponding chromaticity compensation can be made in the pure color light transmitting area, so that the pure color light transmitting area and the overlapping area can be compensated accordingly. The light emitted together meets the expected chromaticity requirements; in addition, in order to minimize the influence on the overall display when the red, green and blue filter layers can pass wavelengths overlapping, the size of the overlapping part should be designed as narrow as possible, and the pixels should be designed as narrow as possible. The larger the size, the less the effect.

The second, for example, when selecting the three filter regions of red, green and blue, the band ranges of the light that can pass through the three filter regions are set to be non-overlapping. As shown in FIG. 4 , in the filter film 60 of the pixel unit 500 , the wavelength range of the light that can pass through the red filter region 61 is selected as 550 to 740 nm, and the wavelength range of the light that can pass through the green filter region 62 is selected as From 450 to 550 nm, the wavelength range of the light that can pass through the blue filter region 63 is selected to be 380 to 450 nm. After this design, since the two adjacent bands do not overlap, no light will be projected in the three overlapping regions. When the three white light LEDs 50 all emit light, the white light passes through the red filter area 61 , the green filter area 62 and the blue filter area 63 to present blue light, red light and green light, respectively. The overlapping area 65 and the blue-red overlapping area 66 are light non-transmitting areas, where no light is emitted.

In this case, it is also possible to set each filter area as a highly reflective filter, so that the overlapping area formed by the overlapping of adjacent filter areas will not absorb light, and the light that cannot pass through the overlapping area will be shot back. , the light emitted by the white LED in the display under this structure is basically lossless, and the chip brightness is high, so that the display device always has a high luminous efficiency.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (11)

1. A filter film, comprising a plurality of filter units arranged in an array, wherein each of the filter units includes a red filter area that allows light having a wavelength of a first wavelength band to penetrate, A green filter region through which light with wavelengths of the second wavelength band penetrates, a blue filter region through which light with wavelengths of the third wavelength band is allowed to penetrate, a red-green overlap region, a green-blue overlap region, and a blue-red overlap region, the The red and green overlapping area is formed by overlapping part of the red filter area and part of the green filter area and is used to isolate the adjacent red filter area and the green filter area, and the green filter area The blue overlapping area is formed by overlapping part of the green filter area and part of the blue filter area and is used to isolate the adjacent green filter area and the blue filter area. The red overlapping area is formed by overlapping part of the blue filter area and part of the red filter area, and is used to isolate the adjacent blue filter area and the red filter area. The green overlapping area only allows the light of the wavelength of the overlapping wavelength band of the first band and the second band to pass through, the green-blue overlapping area only allows the light of the wavelength of the overlapping band of the second band and the third band to pass, and the blue The red overlap region only allows light of wavelengths of the overlapping bands of the first and third bands to pass through. 2 . The filter film according to claim 1 , wherein, in the red-green overlapping region, the red filter region is disposed above or below the green filter region. 3 . 3 . The filter film according to claim 1 , wherein, in the green-blue overlapping region, the green filter region is disposed above or below the blue filter region. 4 . 4 . The filter film according to claim 1 , wherein, in the blue-red overlapping region, the blue filter region is disposed above or below the red filter region. 5 . 5 . The filter film according to claim 1 , wherein the first wavelength band is between 500 nm and 780 nm, the second wavelength band is between 440 nm and 600 nm, and the red and green overlapping area is 5 . Only light with wavelengths between 500nm and 600nm is allowed to pass through. 6 . The filter film according to claim 1 , wherein the first wavelength band is between 500 nm and 740 nm, the third wavelength band is between 380 nm and 490 nm, and the blue-red overlapping region Constitute the light non-transmitting area. 7 . The filter film according to claim 1 , wherein the first wavelength band is between 440 nm and 600 nm, the third wavelength band is between 380 nm and 490 nm, and the green-blue overlap area is 7 . Configured to only allow light with wavelengths between 440nm and 490nm to pass through. 8 . The filter film according to claim 1 , wherein the areas of the red filter region, the green filter region and the blue filter region are all equal. 9 . 9 . The filter film according to claim 1 , wherein the areas of the red-green overlapping region, the green-blue overlapping region and the blue-red overlapping region are all equal. 10 . 10. A display device, comprising a plurality of white light LEDs arranged in an array and the filter film according to any one of claims 1-9, wherein each of the filter units covers three of the white light LEDs on the light-emitting surface and form a pixel unit. 11. The display device according to claim 10, wherein the white LED is a Micro-LED.

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