CN111128036A - Method for improving brightness uniformity of self-luminous display device - Google Patents
Method for improving brightness uniformity of self-luminous display device Download PDFInfo
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- CN111128036A CN111128036A CN201911012710.5A CN201911012710A CN111128036A CN 111128036 A CN111128036 A CN 111128036A CN 201911012710 A CN201911012710 A CN 201911012710A CN 111128036 A CN111128036 A CN 111128036A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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Abstract
The invention discloses a method for improving the brightness uniformity of self-luminous display device, which is characterized in that a layer of silver halide or a photosensitive film layer similar to silver halide is coated on the surface of a pixel of the self-luminous display device, a filter layer similar to a black-white negative film is formed on the surface of the pixel of the self-luminous display device through the processes of pixel self-luminous exposure, development, fixation, film curing and the like in a specific time and a specific driving state, and a filter unit with different light and shade colors, namely different light transmittances can be arranged corresponding to each pixel unit. The brightness uniformity of the self-luminous display device can be greatly improved.
Description
Technical Field
The invention relates to a liquid crystal display technology, in particular to a self-luminous display device technology of OLED, silicon-based LED, MINI-LED and MICRO-LED, and specifically relates to a method for improving the brightness uniformity of the self-luminous display device.
Background
The latest research results of self-luminous display devices such as OLED, silicon-based LED, MINI-LED, MICRO-LED and the like as the display field have been rapidly developed, and the display application range from personal wearable equipment, handheld equipment, industrial control to special places is gradually popularized. However, since the current type display devices are all current-driven self-luminous display devices, a large amount of inconsistent process dimension errors, material luminous efficiency uniformity, impedance characteristics inconsistency caused by coating and packaging, and the like in the manufacturing process can cause large deviation of the luminous brightness of different pixels under the same voltage driving. To reduce this brightness deviation and improve the brightness uniformity of different pixels, special process techniques or special design in circuit driving are usually required, and laser or other micromachining process corrections are used for larger pixel sizes (on the order of 100 microns). For devices with extremely small pixel size, such as silicon-based OLED, silicon-based LED and MICRO-LED, a circuit driving compensation and adjustment mode is generally adopted, and the current is limited for pixels with large driving current under the same driving voltage through built-in software. Or acquiring brightness data of each pixel under the same driving characteristic by an external test method, and setting a current proportion value of each pixel by built-in software. The methods need to invest in large process cost, circuit hardware and software resources, and the manufacturing and production cost of the device is large.
Disclosure of Invention
The invention aims to solve the problems of complicated structure and high cost of the existing method for improving the display uniformity by controlling a driving circuit and software, and discloses a method for improving the brightness uniformity of a self-luminous display device. The luminance uniformity of the self-light emitting display device can be improved.
The technical scheme of the invention is as follows:
a method for improving the brightness uniformity of luminous brightness of self-luminous display device features that an optical film similar to black-and-white negative film is designed on the surface of the pixel of self-luminous display device, that is, a photosensitive film is coated on the surface of the pixel of display device, and a photosensitive exposure is carried out during the self-luminous process of the pixel of display device, and a layer of optical film is formed on the external surface of the pixel by developing and fixing black-and-white negative film.
A silver halide or a photosensitive film layer similar to the silver halide is coated on the surface of a pixel of the self-luminous display device, and the photosensitive exposure is carried out by setting time and setting the self-luminous process of the pixel of the display device in a driving state, so that the photosensitive film layer can emit the irradiation luminous flux which does not exceed a saturation value for each pixel. And forming an optical film on the surface of the pixel by using a black and white negative film developing, fixing and curing process method. The light filtering unit with different light and shade colors, namely different light transmittances can be formed corresponding to each pixel unit of the self-luminous display device. The photosensitive film layer of the silver halide or similar functional material is only sensitive to visible light except red light above 630nm, metal silver is decomposed after the photosensitive film layer is irradiated by light, and the metal silver with different proportions can be analyzed according to different irradiation light fluxes of each pixel unit. The developing process is to dissolve and remove the silver halide or similar functional materials which are not fully exposed, and leave the resolved silver particles; the fixing and curing process is to remove the photosensitive material except the silver particles and form a protective film. The different silver particle solubility of each pixel unit corresponds to different light transmittance.
The total thickness of the optical film layer is controlled in the micron level by adjusting the content proportion of silver halide or similar functional materials of the photosensitive layer, generally the total thickness needs to be controlled below 20% of the pixel point size, and the distance from the surface of the pixel light-emitting layer should be in the same size level. If the thickness of the optical film layer is larger than the thickness of the pixel or the distance from the surface of the pixel light emitting layer, the display device has poor directivity, and the brightness and the uniformity thereof in different directions have large deviation.
The optical film layer manufactured by the invention can optically adjust the brightness of each pixel unit displayed by the display device under the signal characteristic of a conventional driving circuit, the transmittance of the filtering unit corresponding to the pixel with high brightness is low, and the transmittance of the filtering unit corresponding to the pixel with low brightness is high, so that the difference of the brightness of each pixel unit can be reduced, and the display uniformity of the display device is improved.
The invention has the beneficial effects that:
the invention skillfully utilizes the principle and the process technology of the traditional black and white negative film, does not need a mask and a conventional photoetching process, and can be tightly attached to the surface of the light-emitting pixel of the self-luminous display device in an extremely thin space to manufacture the light filtering units with different shades, namely different light transmittances aiming at each pixel unit of the self-luminous display device. Therefore, the luminance of each pixel unit can be adjusted, and the luminance uniformity of the self-luminous display device can be greatly improved.
The technical scheme provided by the invention can better improve the brightness uniformity of the display device, and has low production cost, and the technical scheme is similar to the traditional film production process.
Detailed Description
The following structural examples further illustrate the invention.
A method for improving the brightness uniformity of self-luminous display device is characterized in that a layer of silver halide or silver halide-like photosensitive film layer is coated on the surface of a pixel of a semi-finished product of the self-luminous display device; the semi-finished product is packaged by a film and special protective measures are taken, so that the display can be powered on and each pixel can be driven to light. The silver halide or similar photosensitive film can bear water and solvent corrosion and pollution caused by processes of self-exposure, fixation, development and the like, and the specific protection method and measures can be realized by adopting the prior art.
By setting the time, setting the drive state (e.g., the operating current of a single pixel is 0.5% to 20% of the rated current, and the exposure time is set at 0.1ms to 1 ms) and the process of self-luminescence of the pixels of the display device, the luminous flux can be irradiated to the photosensitive film layer not exceeding the saturation value for each pixel. And forming an optical film on the surface of the pixel by using a black and white negative film developing, fixing, drying and curing process method. The light filtering unit with different light and shade colors, namely different light transmittances can be formed corresponding to each pixel unit of the self-luminous display device.
The photosensitive film layer of the silver halide or similar functional material is only sensitive to visible light except red light above 630nm, and can decompose metal silver after being irradiated by light and resolve the metal silver with different proportions according to different irradiation light fluxes. The factory must carry out red light environmental modification to relevant process equipment and process area, and red light area ambient brightness and spectral distribution must accord with the technological requirement.
The silver halide crystal grain size should be less than 3 microns, and for display devices with pixel sizes less than 10 microns, finer photosensitive grains are required. The total thickness of the optical film layer is controlled in the micron level by adjusting the content proportion of silver halide or similar functional materials of the photosensitive layer, generally the total thickness needs to be controlled below 20% of the pixel point size, and the distance from the surface of the pixel light-emitting layer should be in the same size level. If the thickness of the optical film layer is larger than the thickness of the pixel or the distance from the surface of the pixel light emitting layer, the display device has poor directivity, and the brightness and the uniformity thereof in different directions have large deviation.
The optical film layer manufactured by the invention can optically adjust the brightness of each pixel unit displayed by the display device under the signal characteristic of a conventional driving circuit, the transmittance of the filtering unit corresponding to the pixel with high brightness is relatively low, and the transmittance of the filtering unit corresponding to the pixel with low brightness is relatively high, so that the difference of the brightness of each pixel unit can be reduced, and the display uniformity of the display device is improved.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.
Claims (6)
1. A method for improving the brightness uniformity of luminous brightness of self-luminous display device features that an optical film similar to black-and-white negative film is designed on the surface of the pixel of self-luminous display device, that is, a photosensitive film is coated on the surface of the pixel of display device, and a photosensitive exposure is carried out during the self-luminous process of the pixel of display device, and a layer of optical film is formed on the external surface of the pixel by developing and fixing black-and-white negative film.
2. The method of claim 1, wherein: the optical film can form a film filtering unit with different light and shade colors, namely different light transmittances corresponding to each pixel unit of the self-luminous display device.
3. The method of claim 1, wherein: by setting time and setting pixel self-luminous exposure of a driving state, the light flux can be emitted to the photosensitive film layer for each pixel without exceeding the photosensitive saturation value of the photosensitive film layer.
4. The method of claim 1, wherein: the photosensitive film layer can only be sensitive to visible light except red light above 630nm, decomposes metallic silver after being irradiated by light, and can resolve metallic silver with different proportions according to different irradiation light fluxes.
5. The method according to claim 1 or 4, characterized in that: the photosensitive film layer is silver halide or similar functional materials, the content proportion of the silver halide or similar functional materials of the photosensitive film layer is adjusted, the total thickness of the photosensitive film layer is in the micron level, the total thickness needs to be controlled to be below 20% of the pixel point size, and the distance between the photosensitive film layer and the surface of the pixel light-emitting layer should be in the same size level.
6. The method of claim 1, 2, 3, 4 or 5, wherein: the optical film can optically adjust the brightness displayed by the display device under the signal characteristic of a conventional driving circuit, the transmittance of the filter unit corresponding to the pixel with high brightness is relatively low, and the transmittance of the filter unit corresponding to the pixel with low brightness is relatively high, so that the difference of the brightness of each pixel unit can be reduced, and the display uniformity of the display device is improved.
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| CN201911012710.5A CN111128036A (en) | 2019-10-23 | 2019-10-23 | Method for improving brightness uniformity of self-luminous display device |
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| CN201911012710.5A CN111128036A (en) | 2019-10-23 | 2019-10-23 | Method for improving brightness uniformity of self-luminous display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130376A (en) * | 2020-09-24 | 2020-12-25 | 安徽晟华光学科技有限公司 | Reflection film for improving backlight brightness uniformity of display device |
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