CN112099122A

CN112099122A - Filter film and display device

Info

Publication number: CN112099122A
Application number: CN202011018432.7A
Authority: CN
Inventors: 岳大川; 朱涛
Original assignee: Shenzhen Aoshi Micro Technology Co Ltd
Current assignee: Shenzhen Aoshi Micro Technology Co Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2020-12-18

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 light filter film and a display device.

Background

The current commercial application of LED (light Emitting diode) is relatively common, and in the prior art, there are several LED array full-color schemes:

in the first scheme, a UV LED (ultraviolet LED) or a blue LED is combined with a quantum dot method to realize full-color. The quantum dot technology has the defects of poor material stability, high requirement on heat dissipation, sealing requirement, short service life and the like at present; therefore, mass production cannot be realized.

In the second scheme, a UV LED (ultraviolet LED) or a blue LED is combined with a fluorescent powder method to realize full-color. Since the phosphor needs further light absorption and conversion, the overall response rate and the light efficiency of the device are affected, and since the size of the phosphor particles is larger, about 1-10 microns, as the size of the LED pixel is continuously reduced, the phosphor coating becomes more and more uneven and affects the display quality.

In the third scheme, the coverage area of a light-emitting waveband is increased by controlling the doping ratio of the material growth of a quantum well layer in the LED, and the full-color light emission is realized by controlling the currents with different heights. However, the prior art HIA cannot ensure that the device has stable working performance. Thus, use is limited.

The fourth scheme is realized by adopting the splicing technology of RGB single-color LED devices, but the technology is limited by equipment adopted by the splicing technology and is not mature at present.

In the fifth solution, the white LED combines the Filter (shown in fig. 1) with Black Matrix (Black Matrix) to realize full Color. Since the light emitted from the white LED80 has multiple directions, the light emitted from the LED is partially absorbed by BM due to the light absorption of the black matrix layer in the light emitted from the non-display direction adjacent to the black matrix layer 91, which reduces the luminance of the chip and affects the light emitting efficiency of the device.

Therefore, there is a need for continuous development of full-color schemes for LED arrays to overcome the drawbacks of the prior art.

Disclosure of Invention

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

In order to achieve one purpose of the invention, the invention adopts the following technical scheme on one hand: a filter membrane comprises a plurality of filter units arranged in an array, wherein each filter unit comprises a red filter area allowing light with the wavelength of a first waveband to penetrate, a green filter area allowing light with the wavelength of a second waveband to penetrate, a blue filter area allowing light with the wavelength of a third waveband to penetrate, a red-green overlapping area, a green-blue overlapping area and a blue-red overlapping area, the red-green overlapping area is formed by overlapping part of the red filter area and part of the green filter area and is used for isolating the adjacent red filter area and the green filter area, the green-blue overlapping area is formed by overlapping part of the green filter area and part of the blue filter area and is used for isolating the adjacent green filter area and the blue filter area, the blue-red overlapping area is formed by overlapping part of the blue filter area and part of the red filter area and is used for isolating the adjacent blue filter area and the red filter area, the red-green overlapping area only allows light with the wavelength of the overlapping waveband of the first waveband and the second waveband to pass through, the green-blue overlapping area only allows light with the wavelength of the overlapping waveband of the second waveband and the third waveband to pass through, and the blue-red overlapping area only allows light with the wavelength of the overlapping waveband of the first waveband and the third waveband to pass through.

One preferable scheme of the above technical scheme is as follows: in the red-green overlapping area, the red filter area is arranged above or below the green filter area.

One preferable scheme of the above technical scheme is as follows: in the green-blue overlapping region, the green filter region is disposed above or below the blue filter region.

One preferable scheme of the above technical scheme is as follows: in the blue-red overlapping region, the blue filter region is disposed above or below the red filter region.

One preferable scheme of the above technical scheme is as follows: the first wave band is between 500nm and 780nm, the second wave band is between 440nm and 600nm, and the red and green overlapping region only allows light with the wavelength between 500nm and 600nm to pass through.

One preferable scheme of the above technical scheme is as follows: the first wave band is between 500nm and 740nm, the third wave band is between 380nm and 490nm, and the blue-red overlapping area forms a light non-transmitting area.

One preferable scheme of the above technical scheme is as follows: the first wavelength range is between 440nm and 600nm, the third wavelength range is between 380nm and 490nm, and the green-blue overlapping region is configured to allow only light with a wavelength between 440nm and 490nm to pass through.

One preferable scheme of the above technical scheme is as follows: the areas of the red filter area, the green filter area and the blue filter area are equal.

One preferable scheme of the above technical scheme is as follows: the areas of the red and green overlapping area, the green and blue overlapping area and the blue and red overlapping area are equal.

In order to achieve another purpose of the invention, the invention adopts the following technical scheme: a display device comprises a plurality of white light LEDs arranged in an array and a filter film in the technical scheme, wherein each filter unit covers the light emergent surfaces of the three white light LEDs to form a pixel unit.

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

Compared with the prior art, the invention has the following beneficial effects: according to the invention, the filter areas of two colors are overlapped to form an overlapping area which can be used as a pixel interval, the structure is simple, the process is simple, and the high consistency of the same-color light-emitting wavelength is easily realized; when the filter membrane is arranged on one side of the light emitting surface of the white light LED, the white light LED can easily realize the full colorization of a white light array.

Drawings

FIG. 1 is a schematic diagram of a light path of a single pixel unit in a display device for realizing full-color display by combining a white LED with a filter film having a black matrix in the prior art;

FIG. 2 is a schematic structural diagram of a single pixel unit in a display device using a white LED combined with a filter to realize full color in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of light paths of a single pixel unit in a display device using a white LED combined with a filter to realize full color according to an embodiment of the present invention;

fig. 4 is a schematic diagram of light paths of a single pixel unit in a display device using a white LED combined with a filter to realize full color according to another embodiment of the present invention.

Detailed Description

For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings. In the following description, for 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 be practiced without these specific details or with one or more equivalent arrangements. Moreover, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

Unless otherwise indicated, the illustrated exemplary embodiments are to be understood as providing exemplary features of varying detail of some ways in which the inventive concepts may be practiced. Thus, unless otherwise specified, features, components, modules, layers, films, panels, regions, and/or aspects and the like of different embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the inventive concept.

Spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above," "… …," "higher," "side" (e.g., as in "sidewall"), and the like, may be used herein for descriptive purposes to describe one element's relationship to another (other) element as illustrated in the figures. 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. Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The invention discloses a display panel for realizing full colorization by combining a white light LED with a filter film, which can be applied to Micro-LEDs, OLEDs and the like. In this embodiment, the display device is a silicon-based color micro light emitting diode display device.

Referring to fig. 2, the color microdisplay device includes: a plurality of white LEDs 10 arranged in an array, and a filter 20 (also called a thin filter layer), where the filter 20 includes a plurality of filter units arranged in an array. Each filter unit covers the light-emitting surfaces of the three white LEDs 10 and forms a pixel unit 100. The white LEDs 10 are capable of exciting different intensities of white light based on control conditions. The filter 20 can filter red light, green light and blue light of the white light emitted from the white LED10 to finally present a desired color image.

Each filter unit includes a red filter region 21 allowing light having a wavelength of a first wavelength band to pass therethrough, a green filter region 22 allowing light having a wavelength of a second wavelength band to pass therethrough, a blue filter region 23 allowing light having a wavelength of a third wavelength band to pass therethrough, a red-green overlapping region 24, a green-blue overlapping region 25, and a blue-red overlapping region 26. 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, and the blue-red overlapping area 26 are sequentially arranged. In order to make the light emitted from the filter 20 have high uniformity, the areas of the red filter 21, the green filter 22 and the blue filter 23 are the same. The red green overlap region 24, the green blue overlap region 25, and the blue-red overlap region 26 are all equal in area.

The red-green overlapping region 24 is formed by overlapping a part of the red filter region 21 and a part of the green filter region 22 and is used for isolating the adjacent red filter region 21 and the green filter region 22; the red and green overlap region 24 allows only light of wavelengths in the overlapping wavelength bands of the first and second wavelength bands to pass through.

The green-blue overlapping region 25 is formed by overlapping a part of the green filter region 22 and a part of the blue filter region 23 and is used for isolating the adjacent green filter region 22 and the blue filter region 23, and the green-blue overlapping region 25 only allows light rays with wavelengths of the overlapping wavelength bands of the second wavelength band and the third wavelength band to pass through.

The blue-red overlapping region 26 is formed by overlapping a part of the blue filter region 23 and a part of the red filter region 21 and is used for isolating the adjacent blue filter region 23 and the red filter region 21, and the blue-red overlapping region 26 only allows light rays with wavelengths in the overlapping wavelength band of the first wavelength band and the third wavelength band to pass through.

Thus, the blue light, the red light and the green light emitted from each pixel unit 100 do not interfere with each other, and rich color change can be presented by controlling, and the display device serving as the carrier of the pixel unit can display full color close to natural spectrum to the outside.

In designing three overlapping area structures according to the above technical scheme, two effects can be achieved by designing and selecting the light-transmitting wavelengths of three filter layers of RGB:

in the first scheme, when designing the blue filter region, the green filter region and the red filter region, the wavelength bands of the three filter regions capable of projecting light can be designed to be partially overlapped. As shown in fig. 3, in the filter 40 of the pixel unit 300, each filter unit includes a red filter region 41 allowing light with a wavelength range of 500nm to 780nm to pass through, a green filter region 42 allowing light with a wavelength range of 440nm to 600nm to pass through, and a blue filter region 43 allowing light with a wavelength range of 380nm to 490nm to pass through. Thus, the red-green overlap region 44 will only allow the passage of waves in the range of 500nm to 600nm, the green-blue overlap region 46 will only allow the passage of wavelengths in the range of 440nm to 490nm, and the blue-red overlap region 45 constitutes the non-light-transmitting region. When the 3 white LEDs 30 all emit light, the white light respectively shows blue light, red light and green light after passing through the red filter area 41, the green filter area 42 and the blue filter area 43, only yellow light and cyan light with narrow wavelength ranges are emitted through the red-green overlapping area 44 and the green-blue overlapping area 45, and no light is emitted because the blue-red overlapping area 46 is a light non-transmitting area.

The filter film designed according to the scheme displays the overlapped light colors in the overlapping area beside the light with each single pure color, and can perform corresponding chromaticity compensation in the pure color light transmission area according to the light transmission condition at the overlapping part, so that the light jointly emitted by the pure color light transmission area and the overlapping area meets the expected chromaticity requirement; in addition, when the filter layers of red, green and blue colors can overlap each other by wavelength, the size of the overlapping portion should be designed to be as narrow as possible, and the influence is reduced as the pixel size is larger, in order to minimize the influence on the entire display.

Second, for example, when three filter regions of red, green and blue are selected, the ranges of the wavelengths of light that can pass through the three filter regions are set to be non-overlapping. As shown in FIG. 4, in the filter 60 of the pixel unit 500, the wavelength range of the light passing through the red filter region 61 is 550 to 740nm, the wavelength range of the light passing through the green filter region 62 is 450 to 550nm, and the wavelength range of the light passing through the blue filter region 63 is 380 to 450 nm. With the design, because two adjacent wave bands are not overlapped, three overlapped areas can not project light. When all of the 3 white LEDs 50 emit light, the white light passes through the red filter region 61, the green filter region 62 and the blue filter region 63 and then respectively shows blue light, red light and green light, and since the red-green overlapping region 64, the green-blue overlapping region 65 and the blue-red overlapping region 66 are light non-transmitting regions, no light is emitted.

In the present case, still can set up each filter zone as the high reflection-type and filter, the overlap region that forms by the overlap of adjacent filter zones will not absorb light like this, and the light that can't pass through the overlap region will be beaten back, consequently, the light that white light LED sent in the display under this structure basically has no loss, and chip luminance is high, and then makes display device have higher luminous efficiency all the time.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The filter membrane comprises a plurality of filter units arranged in an array manner, and is characterized in that each filter unit comprises a red filter area allowing light with the wavelength of a first waveband to penetrate, a green filter area allowing light with the wavelength of a second waveband to penetrate, a blue filter area allowing light with the wavelength of a third waveband to penetrate, a red-green overlapping area, a green-blue overlapping area and a blue-red overlapping area, wherein 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 for isolating the adjacent red filter area and the green filter area, the green-blue overlapping area is formed by overlapping a part of the green filter area and a part of the blue filter area and is used for isolating the adjacent green filter area and the adjacent blue filter area, and 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 for isolating the adjacent blue filter area and the red filter area The color filter area, the said red and green overlap area only allows the light of the wavelength of the overlapping wave band of the first wave band and the second wave band to pass through, the said green and blue overlap area only allows the light of the wavelength of the overlapping wave band of the second wave band and the third wave band to pass through, the said blue and red overlap area only allows the light of the wavelength of the overlapping wave band of the first wave band and the third wave band to pass through.

2. The film filter of claim 1, wherein the red-green overlap region is disposed above or below the green filter region.

3. The film filter of claim 1, wherein the green filter region is disposed above or below the blue filter region in the green-blue overlap region.

4. The filter of claim 1, wherein the blue filter is disposed above or below the red filter in the blue-red overlap region.

5. The film filter of claim 1, wherein the first wavelength band is between 500nm and 780nm, the second wavelength band is between 440nm and 600nm, and the red-green overlap region allows only light with a wavelength between 500nm and 600nm to pass through.

6. The film filter of claim 1, wherein the first wavelength range is 500nm to 740nm, the third wavelength range is 380nm to 490nm, and the blue-red overlapping region constitutes a light non-transmitting region.

7. The film filter of claim 1, wherein the first wavelength range is between 440nm and 600nm, the third wavelength range is between 380nm and 490nm, and the green-blue overlap region is configured to allow only light with a wavelength between 440nm and 490nm to pass therethrough.

8. The filter of claim 1, wherein the areas of the red, green, and blue filter regions are all equal.

9. The film filter of claim 1, wherein the red-green overlap region, the green-blue overlap region, and the blue-red overlap region have equal areas.

10. A display device, comprising a plurality of white LEDs arranged in an array and the filter film according to any one of claims 1-9, wherein each of the filter units covers the light emitting surfaces of three of the white LEDs and forms a pixel unit.

11. The display device according to claim 10, wherein the white light LED is a Micro-LED.