A kind of double-layer micro-nano texture film and pixel-level dynamic color gamut compensation's screen-off display device and method

Abstract

The application discloses a kind of double-layer micro-nano texture film and pixel-level dynamic color gamut compensation's screen-off display device and method, the device includes driving backplate, microcrystalline light-emitting chip array, optical adhesive, double-layer micro-nano texture film, surface protective layer and control driving module, core in double-layer micro-nano texture film: bottom layer is subwavelength grating, realize near zero reflection and inhibit moire;Surface layer is non-periodic random decorative microstructure, ensure high-quality texture when screen-off time.It is established compensation mapping library by pre-pixel-by-pixel calibration RGB three-channel spectral attenuation and color gamut loss parameter on method;Bright screen time by control driving module to each pixel independently carries out three-channel gain, hue, saturation and dynamic compensation of color gamut range, accurate correction color deviation.The application solves the technical contradiction that traditional texture screen cannot consider screen-off decorative texture and bright screen high color gamut high color accuracy display, eliminates moire interference, greatly improves color performance, and process compatibility is strong, easy to mass production.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to an always-on display device and method with a double-layer micro-nano texture film and pixel-level dynamic color gamut compensation. Background Technology

[0002] With the development of smart spaces, immersive displays, and integrated decorative display technologies, textured screens, with their dual characteristics of serving as decorative panels when off and high-definition displays when on, are increasingly widely used in scenarios such as home background walls, hotel lobbies, exhibition halls, and brand image walls. Existing textured screens typically use a single-layer micro-nano texture film bonded to the surface of a microcrystalline light-emitting chip display module. The microstructure of the texture film reflects ambient light to achieve the textured effect when the screen is off.

[0003] However, existing technologies have the following significant drawbacks: First, a single-layer texture structure cannot simultaneously achieve both a premium feel when the screen is off and high-quality image when the screen is on. Specifically, if a deep, high-density texture is used, the decorative effect of wood grain, marble, etc., is good when the screen is off. However, the light emitted from the microcrystalline light-emitting chip will be severely scattered when passing through the texture film, resulting in reduced display brightness, color gamut compression, and reduced color saturation, making the overall image appear grayish. Conversely, if the texture depth and density are reduced, the image quality when the screen is on will be improved, but the texture will be blurry and lack texture when the screen is off, significantly diminishing the decorative effect. These contradictions are technical challenges that are difficult to overcome with current technology.

[0004] Secondly, it is prone to optical interference such as moiré patterns and water ripples. Single-layer textured films often employ periodic or quasi-periodic microstructures. When these structures are superimposed on the regular pixel matrix of the microcrystalline light-emitting chip, they are extremely prone to producing moiré patterns, bright and dark stripes, and graininess, which seriously affect the visual effect.

[0005] Third, existing compensation methods only address brightness, resulting in poor color consistency. Specifically, current technologies only consider pixel brightness unevenness caused by differences in the transmittance of the texture film, without compensating for the differential attenuation of the R, G, and B channel spectra by the texture film. This leads to hue shifts, inconsistent color gamuts, and decreased color accuracy in different pixel areas. The color distortion problem is even more pronounced when two texture films are stacked.

[0006] Fourth, simple double-layer texture overlay will introduce new problems, such as the moiré pattern being aggravated by the similar periods of the two textures, and the inconsistent RGB spectral attenuation caused by different transmittance and scattering characteristics, which cannot be corrected by conventional brightness compensation.

[0007] Therefore, existing textured screen technology cannot simultaneously meet the dual requirements of high-quality textured display when the screen is off and high color gamut, high color accuracy and high definition display when the screen is on. Innovation is urgently needed from the perspective of structural design and driving compensation algorithm. To this end, we designed a screen-off display device and method with a double-layer micro-nano texture film and pixel-level dynamic color gamut compensation. Summary of the Invention

[0008] The purpose of this invention is to provide a dual-layer micro-nano textured film structure, with the upper layer employing a non-periodic random microstructure and the lower layer being a subwavelength grating film, thus physically preventing moiré patterns; establishing a pixel-level dynamic color gamut compensation model to dynamically correct hue, saturation, and color gamut range for RGB three-channel spectral attenuation; achieving adaptive switching between screen-off decorative mode and screen-on high-definition mode, balancing decorative appeal and display performance; and being compatible with existing microcrystalline light-emitting chips / COB processes, making it highly producible.

[0009] To achieve the above objectives, the present invention provides the following technical solution: A screen-off display device with a dual-layer micro-nano texture film and pixel-level dynamic color gamut compensation includes, from bottom to top: a driving backplane layer, a microcrystalline light-emitting chip pixel array layer, an optical adhesive layer, a dual-layer micro-nano texture film, a surface protective layer, and a control driving module.

[0010] Driving backplane layer: It adopts a COB aluminum substrate or a dedicated driving PCB board for microcrystalline light-emitting chips, which integrates microcrystalline light-emitting chip driving circuit, power supply unit and signal processing unit to provide driving signals and power for the microcrystalline light-emitting chip pixel array.

[0011] Microcrystalline light-emitting chip pixel array layer: It consists of multiple microcrystalline light-emitting chips or COB packaged microcrystalline light-emitting chips arranged in a matrix array, with a pixel pitch of 0.9 mm–3.0 mm, and is used to output image images according to the driving signal.

[0012] Optical adhesive layer: High transmittance and low refractive index bubble-free optical adhesive is used to bond the pixel array layer of the microcrystalline light-emitting chip to the double-layer micro-nano texture film to reduce reflection loss between the interfaces.

[0013] The dual-layer micro / nano textured film (core structure) consists of a subwavelength grating bottom layer near the pixel array layer of the microcrystalline light-emitting chip, and a decorative micro / nano textured surface layer located outside the bottom layer. The two textures have different periods and arrangements to avoid superposition interference that would produce moiré patterns.

[0014] (1) Subwavelength grating bottom layer: Its grating period is smaller than the visible light wavelength, preferably 200 nm–380 nm, the grating groove depth is 80 nm–200 nm, and the grating type is a one-dimensional or two-dimensional rectangular subwavelength grating. By adjusting the grating material, groove depth, duty cycle and period, near-zero reflectivity can be achieved, effectively suppressing Fresnel reflection of light on the surface.

[0015] (2) Decorative micro-nano textured surface layer: disposed on the outer side of the subwavelength grating bottom layer, it is a non-periodic random microstructure, specifically a customized wood grain, marble grain, cement grain or metal brushed grain microstructure, etc., with a texture depth preferably 8 μm–20 μm. When the screen is off, this surface layer is used to reflect ambient light to present a high-quality decorative texture.

[0016] Preferably, the overall light transmittance of the double-layer micro-nano textured film is 82%–93%.

[0017] Surface protective layer: It adopts a high-hardness transparent nano-coating, which has anti-scratch, anti-fingerprint, dustproof and waterproof properties, and is used to protect the double-layer micro-nano textured film.

[0018] Control and driving module: Electrically connected to the pixel array layer of the microcrystalline light-emitting chip, its internal memory pre-stores the RGB three-channel spectral attenuation parameters, color gamut attenuation parameters, hue shift, and saturation loss parameters corresponding to each pixel for the dual-layer micro / nano texture film. This module has a built-in pixel-level dynamic color gamut compensation algorithm for dynamically correcting the RGB three-channel gain, hue, saturation, and color gamut range of each pixel, and also has the function of switching between screen-off mode and screen-on mode.

[0019] A screen-off display method based on the above-mentioned device includes the following steps: S1: During the manufacturing process, for each microcrystalline light-emitting chip pixel covered by the double-layer micro-nano texture film, the spectral transmittance, color gamut attenuation, hue shift value and saturation loss value of the R, G and B channels are detected respectively. A pixel-color gamut compensation mapping library is established and stored in the control and driving module.

[0020] S2: The control driver module receives externally input image signals and parses them to obtain the original RGB values, original hue, original saturation, and original color gamut information of each pixel.

[0021] S3: Based on the pixel-color gamut compensation mapping library, perform the following dynamic compensation operation independently on each pixel: a. Gain compensation is applied to the R, G, and B channels respectively to counteract the spectral attenuation caused by the double-layer textured film; b. Correct the hue offset of each pixel to ensure accurate color reproduction; c. Dynamically enhance the color saturation of each pixel to compensate for the saturation loss caused by the texture film; d. Expand the color gamut range of each pixel to offset the color gamut compression problem.

[0022] S4: The control drive module adaptively switches according to the mode command. a. Screen-off mode: The control driver module turns off the power supply to the pixel array of the microcrystalline light-emitting chip. The double-layer micro-nano texture film reflects ambient light, and the decorative micro-nano texture surface presents a preset texture effect to achieve the decorative function. b. Bright screen mode: The control driver module turns on the microcrystalline light-emitting chip pixel array, calls the pixel-color gamut compensation mapping library and executes the dynamic compensation in step S3 in real time, thereby outputting a high-definition image with high color gamut and high color accuracy.

[0023] As a further improvement, the method also includes S5 (dynamic brightness linkage compensation step): the device can integrate an ambient light sensor, control the drive module to collect ambient brightness, and dynamically adjust the compensation intensity in step S3 according to the brightness value. In low ambient light scenes, the compensation intensity is reduced to achieve an artistic effect of subtle fusion between the image and texture; in high ambient light scenes, full-frame color gamut compensation is enabled to ensure a pure image without texture interference.

[0024] The beneficial effects of this invention are: 1. Resolve the inherent contradictions of single-layer textures: The dual-layer texture design has a division of labor, with the bottom layer controlling light and the top layer decorating, achieving both high-quality textures when the screen is off and high-definition image quality when the screen is on, avoiding mutual constraints between the two.

[0025] 2. Completely suppress moiré interference: The underlying subwavelength grating film achieves near-zero reflection through parameter adjustment, suppressing Fresnel reflection and physically eliminating moiré, water ripple, and graininess issues.

[0026] 3. Significantly improved color display performance: Abandoning the traditional single brightness compensation, it adopts pixel-level dynamic color gamut compensation, independently correcting the three RGB channels, improving color gamut, color accuracy, and saturation, resulting in uniform and unbiased color in the picture.

[0027] 4. Intelligent mode switching, applicable to a wide range of scenarios: It realizes the functions of screen-off decoration, screen-on high-definition display, and low-brightness artistic blending mode, which are suitable for multiple scenarios such as home, hotel, exhibition hall, and commercial space.

[0028] 5. Good process compatibility and easy mass production: Subwavelength grating films can be prepared by photolithography, nanoimprinting, ion beam etching, and ICP etching; silicon nitride thin film is used to replace photoresist as pattern mask to improve pattern fineness, and nanoimprinting technology can achieve mass production. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the layered structure of the always-on display device with double-layer micro-nano texture film and pixel-level dynamic color gamut compensation according to the present invention.

[0030] Among them: 1-driving backplane layer; 2-microcrystalline light-emitting chip pixel array layer; 3-optical adhesive layer; 4-double-layer micro-nano texture film; 41-subwavelength grating bottom layer; 42-decorative micro-nano texture surface layer; 5-surface protective layer. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0032] A screen-off display device with a double-layer micro-nano texture film 4 and pixel-level dynamic color gamut compensation includes, from bottom to top: a driving backplate layer 1, a microcrystalline light-emitting chip pixel array layer 2, an optical adhesive layer 3, a double-layer micro-nano texture film 4, and a surface protective layer 5, and also includes a control driving module.

[0033] Drive backplane layer 1: A COB aluminum substrate or microcrystalline light-emitting chip driving PCB board is used, which integrates microcrystalline light-emitting chip driving circuit, power supply unit and signal processing unit to provide driving signals and power for microcrystalline light-emitting chip pixel array.

[0034] Microcrystalline light-emitting chip pixel array layer 2: It consists of microcrystalline light-emitting chips or COB-packaged microcrystalline light-emitting chips arranged in a matrix array, with a pixel pitch of 0.9–3.0 mm, used to output images.

[0035] Optical adhesive layer 3: High-transmittance, low-refractive-index, bubble-free optical adhesive is used to bond the pixel array layer 2 of the microcrystalline light-emitting chip to the double-layer micro-nano texture film 4, thereby reducing interface reflection loss.

[0036] Bilayer micro-nano textured film 4: It includes a subwavelength grating bottom layer 41 and a decorative micro-nano textured surface layer 42. The decorative micro-nano textured layer is a non-periodic random microstructure. The two textures have different periods and arrangements to avoid superposition interference and the generation of moiré patterns.

[0037] The subwavelength grating bottom layer 41 is located near the pixel array layer 2 of the microcrystalline light-emitting chip. Its microstructure parameters are: grating period 200–380 nm, grating groove depth 80–200 nm, and grating type is a one-dimensional / two-dimensional rectangular subwavelength grating. By adjusting the grating material, groove depth, duty cycle and period, near-zero reflectivity is achieved, and Fresnel reflection of light on the surface is suppressed.

[0038] The decorative micro-nano textured surface layer 42 is located outside the subwavelength grating bottom layer 41 and is a customized wood grain, marble grain, cement grain, and metal brushed texture microstructure with a texture depth of 8–20 μm. When the screen is off, it reflects ambient light and presents a high-quality decorative texture. The overall light transmittance of the double-layer micro-nano textured film 4 is 82%–93%.

[0039] Surface protective layer 5: It adopts a high-hardness transparent nano-coating, which has anti-scratch, anti-fingerprint, dustproof and waterproof properties, and protects the double-layer micro-nano textured film.

[0040] Control drive module: It is electrically connected to the pixel array layer 2 of the microcrystalline light-emitting chip, and pre-stores the RGB three-channel spectral attenuation parameters, color gamut attenuation parameters, hue offset, and saturation loss parameters of each pixel corresponding to the double-layer micro-nano texture film 4; it has a built-in pixel-level dynamic color gamut compensation algorithm to dynamically correct the RGB three-channel gain, hue, saturation, and color gamut range of each pixel; and it has a screen-off mode and screen-on mode switching control function.

[0041] A screen-off display method using a dual-layer micro / nano textured film and pixel-level dynamic color gamut compensation. The method based on the above-mentioned always-on display device includes the following steps: S1: Pixel / Gamut Attenuation Parameter Calibration During the manufacturing process, the RGB three-channel spectral transmittance, color gamut attenuation, hue shift value, and saturation loss value of each microcrystalline light-emitting chip pixel covered by the double-layer micro-nano texture film 4 are detected respectively. A pixel / color gamut compensation mapping library is established and stored in the control and driving module.

[0042] S2: Receive and parse image signals The control driver module receives externally input image signals and parses them to obtain the original RGB values, original hue, original saturation, and original color gamut information of each pixel.

[0043] S3: Pixel-level dynamic color gamut compensation Based on the pixel / color gamut compensation mapping library, perform independent dynamic compensation for each pixel: 1. Gain compensation is applied to the R, G, and B channels respectively to counteract the spectral attenuation caused by the double-layer textured film; 2. Correct pixel hue offset to ensure accurate color reproduction; 3. Dynamically enhance color saturation to compensate for saturation loss caused by the texture film; 4. Expand the pixel color gamut range to offset the color gamut compression problem.

[0044] S4: Adaptive Mode Switching (1) Screen off mode: The control drive module turns off the power supply to the microcrystalline light-emitting chip pixel array, the double-layer micro-nano texture film 4 reflects ambient light, and the decorative micro-nano texture surface layer 42 presents the preset texture effect to realize the wall decoration function. (2) Bright screen mode: The control driver module turns on the microcrystalline light-emitting chip pixel array, calls the pixel / color gamut compensation mapping library to perform dynamic color gamut compensation in real time, and outputs high color gamut, high color accuracy high-definition images.

[0045] S5: Dynamic brightness compensation By combining ambient light sensor data to collect ambient brightness, the compensation intensity is reduced in low ambient light scenes to achieve an artistic effect of subtle fusion between the image and texture; in high ambient light scenes, full-frame color gamut compensation is enabled to ensure a pure image without texture interference.

[0046] Working principle: This invention employs a dual-layer, specialized micro-nano textured film. The bottom subwavelength grating film achieves near-zero reflectivity, effectively suppressing Fresnel reflection of light on the surface, resulting in a thin and lightweight overall film. The surface layer is responsible for the screen-off texture decoration, and the non-periodic random microstructure disrupts the periodic interference conditions, eliminating moiré patterns from a physical perspective.

[0047] When the screen is on, the control and driving module performs pixel-level three-channel color gamut, hue, and saturation dynamic compensation based on the differential attenuation of the RGB spectrum of each pixel according to the dual-layer texture, accurately correcting color deviations and improving color gamut coverage and color accuracy. When the screen is off, the microcrystalline light-emitting chip is turned off, and the dual-layer texture reflects ambient light to present a decorative texture, achieving two uses for one screen. At the same time, the compensation intensity is dynamically adjusted according to ambient light to take into account the display effect and artistic texture in different scenarios.

[0048] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An always-on display device with a double-layer micro / nano textured film and pixel-level dynamic color gamut compensation, characterized in that, include: Drive backsheet layer; Microcrystalline light-emitting chip pixel array layer disposed on the driving backplane layer; An optical adhesive layer disposed above the pixel array layer of the microcrystalline light-emitting chip; A double-layer micro / nano textured film is disposed above the optical adhesive layer. The double-layer micro / nano textured film includes a subwavelength grating bottom layer near the optical adhesive layer and a decorative micro / nano textured surface layer disposed outside the subwavelength grating bottom layer. The grating period of the subwavelength grating bottom layer is smaller than the visible light wavelength, and the decorative micro / nano textured surface layer is a non-periodic random microstructure. A surface protective layer is disposed outside the double-layer micro / nano textured film. A control and driving module electrically connected to the pixel array layer of the microcrystalline light-emitting chip is also included. The control and driving module pre-stores the RGB three-channel spectral attenuation parameters, color gamut attenuation parameters, hue shift, and saturation loss parameters for each pixel corresponding to the dual-layer micro-nano texture film, which are used to perform pixel-level dynamic color gamut compensation for each pixel; the grating period of the subwavelength grating bottom layer is 200nm–380nm, and the grating groove depth is 80nm–200nm; the texture depth of the decorative micro-nano texture surface layer is 8μm–20μm; the overall transmittance of the dual-layer micro-nano texture film is 82%–93%.

2. The always-on display device with a dual-layer micro-nano textured film and pixel-level dynamic color gamut compensation according to claim 1, characterized in that: The subwavelength grating bottom layer is a one-dimensional grating structure or a two-dimensional rectangular grating structure; the decorative micro-nano texture surface layer is a microstructure that imitates wood grain, marble grain, cement grain, or brushed metal grain.

3. The always-on display device with a dual-layer micro / nano textured film and pixel-level dynamic color gamut compensation according to claim 1, characterized in that: The microcrystalline light-emitting chip pixel array layer is composed of independent microcrystalline light-emitting chips or COB-packaged microcrystalline light-emitting chips arranged in a matrix, with a pixel pitch of 0.9 mm–3.0 mm; the optical adhesive layer is a bubble-free optical adhesive with high light transmittance and low refractive index; and the surface protective layer is a high-hardness transparent nano-coating.

4. A screen-off display method with a dual-layer micro / nano textured film and pixel-level dynamic color gamut compensation, utilizing the screen-off display device as described in any one of claims 1-3, characterized in that... Includes the following steps: S1: Perform spectral detection on each microcrystalline light-emitting chip pixel covered by the double-layer micro-nano textured film to obtain the RGB three-channel spectral attenuation parameters, color gamut attenuation parameters, hue shift, and saturation loss value corresponding to each pixel. Establish a pixel-color gamut compensation mapping library and store it in the control driving module. S2: The control driving module receives the externally input image signal and parses it to obtain the original RGB value, original hue, and original saturation of each pixel. S3: Based on the pixel-color gamut compensation mapping library, the control driving module independently performs the following dynamic compensation for each pixel: perform gain compensation on the R, G, and B channels respectively, correct the pixel hue shift, improve color saturation, and widen the pixel color gamut range. S4: The control and drive module controls the microcrystalline light-emitting chip pixel array layer according to the working mode; in the screen-off mode, the power supply of the microcrystalline light-emitting chip pixel array layer is turned off, so that the double-layer micro-nano texture film reflects ambient light to present decorative texture; in the screen-on mode, the microcrystalline light-emitting chip pixel array layer is turned on, and the pixel-color gamut compensation mapping library is called in real time to perform the dynamic compensation described in step S3 to output the compensated high-definition image; S5: Dynamic brightness linkage compensation also includes an ambient light sensor. The control and drive module obtains the ambient brightness value collected by the ambient light sensor and dynamically adjusts the compensation intensity of the dynamic compensation in step S3 according to the ambient brightness value.

5. The always-on display method with a dual-layer micro / nano textured film and pixel-level dynamic color gamut compensation according to claim 4, characterized in that: The specific steps of dynamically adjusting the compensation intensity based on the ambient brightness value are as follows: when the ambient brightness value is lower than the preset low brightness threshold, the intensity of the dynamic compensation is reduced to achieve visual fusion between the image and the decorative texture; when the ambient brightness value is higher than the preset high brightness threshold, the dynamic compensation is performed at full amplitude to ensure the purity of the image.

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