Method of chrominance compensation of pixels and micro-led display thereof

Abstract

A pixel chrominance compensation method and a micro-LED display are provided. The method includes sequentially driving a first pixel, a second pixel and a third pixel in each pixel of a micro-LED display to emit light; measuring a first dominant wavelength of the first pixel, a second dominant wavelength of the second pixel and a third dominant wavelength of the third pixel; and driving the second pixel or the third pixel in each pixel to emit light with partial brightness to mix the light emitted by the first pixel in a pixel with the first dominant wavelength, wherein the color matching of the mixed light is represented as an adjusted first dominant wavelength, and the adjusted dominant wavelength approaches a minimum value, a maximum value or an average value of the measured first dominant wavelengths.

Description

Technical Field

[0001] This invention relates to a pixel chromaticity compensation method and a display of the same using micro light-emitting diodes, particularly to a method for compensating for the primary color light using other colors of light and a display using the method. Background Technology

[0002] In the field of light-emitting diode (LED) technology, LEDs have been developed that shrink the size of traditional LEDs to the micrometer level; these are called micro LEDs (μLEDs). When micro LEDs are used in display technology, each micro LED can be considered a sub-pixel in a display panel, and such a display panel is called a micro LED display. Due to its advantages such as high luminous efficiency, long lifespan, and high resolution, micro LED displays are considered the next mainstream display technology.

[0003] The epitaxial growth process for Micro LEDs employs techniques such as metal-organic chemical vapor deposition (MOCVD) to grow the light-emitting structure layer on a supporting substrate. Due to variations in production conditions and raw materials during the epitaxial growth process, each MicroLED chip exhibits differences in optical characteristics. However, the requirements for brightness and color uniformity of MicroLED chips in Micro LED displays are becoming increasingly stringent, especially for head-mounted displays where color difference must be eliminated within small areas.

[0004] Therefore, after optical characteristic testing, some grades or binaries of Micro LED chips are unusable, resulting in a very low yield and significantly increased production costs. On the other hand, to ensure that most grades or binaries of chips can be used, chips of different grades or binaries are randomly placed on the display substrate containing the driving circuit. However, this arbitrary mixing of chips can easily lead to significant color differences when adjacent pixels display the same single color light (e.g., all pixels display only red light), making it easy to see noise in the image. Summary of the Invention

[0005] In one embodiment of the present invention, a pixel color compensation method is provided, comprising: driving a first pixel, a second pixel, and a third pixel of a display of micro-light-emitting diodes to emit light sequentially; measuring a first dominant wavelength of the first pixel, a second dominant wavelength of the second pixel, and a third dominant wavelength of the third pixel in each pixel; and driving the second pixel or the third pixel in each pixel to emit light at a partial brightness to mix with the first pixel in the same pixel emitting light at the first dominant wavelength, wherein the color matching of the mixed light will be manifested as an adjusted first dominant wavelength, the adjusted first dominant wavelength being close to a minimum, a maximum, or an average value among the measured first dominant wavelengths.

[0006] In another embodiment of the present invention, when the first pixel is a red sub-pixel and the second pixel is a green sub-pixel, the red sub-pixel emits red light with a red dominant wavelength, and the green sub-pixel in the same pixel emits green light with a partial brightness and a green dominant wavelength. The color matching of the light after the red light and the green light are mixed will be manifested as an adjusted red dominant wavelength, which is close to the minimum value among the measured first dominant wavelengths.

[0007] In another embodiment of the present invention, when the first pixel is a blue sub-pixel and the second pixel is a green sub-pixel, the blue sub-pixel emits blue light with a blue dominant wavelength, and the green sub-pixel in the same pixel emits green light with a green dominant wavelength at a partial brightness. The color matching of the light after the blue light and the green light are mixed will be manifested as an adjusted blue dominant wavelength, which is close to the maximum value among the measured first dominant wavelengths.

[0008] In another embodiment of the present invention, when the first pixel is a green sub-pixel, the second pixel is a blue sub-pixel, and the third pixel is a red sub-pixel, the green sub-pixel emits green light with a dominant green wavelength, and the blue sub-pixel in the same pixel emits blue light with a partial brightness and a dominant blue wavelength. The color matching of the light after the green light and the blue light are mixed will be manifested as an adjusted dominant green wavelength, which is close to the average value of each of the measured first dominant wavelengths.

[0009] In another embodiment of the present invention, when the first pixel is a green sub-pixel, the second pixel is a blue sub-pixel, and the third pixel is a red sub-pixel, the green sub-pixel emits green light with a green dominant wavelength, and the red sub-pixel in the same pixel emits red light with a partial brightness and has a red dominant wavelength. The color matching of the light after the green light and the red light are mixed will be manifested as an adjusted green dominant wavelength, which is close to the average value of each of the measured first dominant wavelengths.

[0010] In one embodiment of the present invention, a display of a miniature light-emitting diode is provided, comprising: a plurality of pixels, each pixel including a red subpixel, a green subpixel and a blue subpixel; a storage unit storing a first dominant wavelength of the red subpixel, a second dominant wavelength of the green subpixel and a third dominant wavelength of the blue subpixel in each pixel, and storing a maximum first dominant wavelength among the first dominant wavelengths, a maximum second dominant wavelength among the second dominant wavelengths and a maximum third dominant wavelength among the third dominant wavelengths; and a driving circuit configured to drive one of the red subpixel, green subpixel and blue subpixel in each pixel to emit light at full brightness, while driving the other or the other two to emit light at partial brightness, wherein the color matching of the mixed light will be manifested as an adjusted dominant wavelength, and the adjusted dominant wavelengths are approximately the same.

[0011] In another embodiment of the present invention, the red subpixel emits red light at full brightness and has a red light main wavelength, and the green subpixel in the same pixel emits green light at partial brightness and has a green light main wavelength. The color matching of the light after the red light and the green light are mixed will be manifested as an adjusted red light main wavelength, which is close to a minimum value among the first main wavelengths.

[0012] In another embodiment of the present invention, the blue sub-pixel emits blue light at full brightness and has a blue light main wavelength, and the green sub-pixel in the same pixel emits green light at partial brightness and has a green light main wavelength. The color matching of the light after the blue light and the green light are mixed will be manifested as an adjusted blue light main wavelength, which is close to a maximum value among the third main wavelengths.

[0013] In another embodiment of the present invention, the green subpixel emits green light at full brightness and has a green light main wavelength, and the blue subpixel in the same pixel emits blue light at partial brightness and has a blue light main wavelength. The color matching of the light after the green light and the blue light are mixed will be manifested as an adjusted green light main wavelength, which is close to an average value of each of the second main wavelengths.

[0014] In another embodiment of the present invention, the green subpixel emits green light at full brightness and has a green light main wavelength, and the red subpixel in the same pixel emits red light at partial brightness and has a red light main wavelength. The color matching of the light after the green light and the red light are mixed will be manifested as an adjusted green light main wavelength, which is close to an average value of each of the second main wavelengths. Attached Figure Description

[0015] To fully understand the nature, advantages, and preferred embodiments of the present invention, the following detailed description can be more clearly understood by referring to the accompanying drawings.

[0016] Figure 1A and Figure 1BThis is a schematic diagram depicting a display of a miniature light-emitting diode according to an embodiment of the present invention.

[0017] Figure 2A ~ Figure 2C A schematic diagram illustrating the wavelength matching of red and green light after mixing, according to an embodiment of the present invention.

[0018] Figure 3A ~ Figure 3C A schematic diagram illustrating the wavelength matching of blue and green light after mixing, according to an embodiment of the present invention.

[0019] Figure 4A ~ Figure 4C A schematic diagram illustrating the wavelength matching of green and blue light after mixing, according to an embodiment of the present invention.

[0020] Figure 5A ~ Figure 5C A schematic diagram illustrating the wavelength matching of green and red light after mixing, according to an embodiment of the present invention.

[0021] Figure 6 A flowchart of a pixel chromaticity compensation method is shown according to an embodiment of the present invention.

[0022] Explanation of key component symbols:

[0023] 10: Monitor

[0024] 11: Substrate

[0025] 12: pixels

[0026] 13: Drive Circuit

[0027] 14: Storage Unit

[0028] 600: Flowchart

[0029] 601: Steps

[0030] 602: Steps

[0031] 603: Steps

[0032] 12B: Blue subpixel

[0033] 12R: Red subpixel

[0034] 12G: Green subpixel

[0035] C1, C2, C3: Chromaticity Detailed Implementation

[0036] The following description illustrates preferred embodiments of the present invention. The invention will be described below with reference to specific embodiments and accompanying drawings. Therefore, the invention is not intended to be limited to the embodiments shown, but rather to conform to the principles disclosed herein. Furthermore, those skilled in the art will make various modifications or variations based on the invention and incorporate them into the spirit and scope of this document and the appended claims.

[0037] In this invention, the use of terms such as first, second, and third, etc., is understood to be for describing various elements, components, regions, layers, and / or blocks. However, these elements, components, regions, layers, and / or blocks should not be limited by these terms. These terms are limited to identifying individual elements, components, regions, layers, and / or blocks only. Therefore, a first element, component, region, layer, and / or block in the following text may also be referred to as a second element, component, region, layer, and / or block without departing from the spirit of the invention.

[0038] Figure 1A and Figure 1B This is a schematic diagram depicting a display of a micro light-emitting diode according to an embodiment of the present invention. The display 10 includes a substrate 11, a plurality of pixels 12 disposed on the substrate 11, a driving circuit 13, and a storage unit 14. The driving circuit 13 drives the red sub-pixel 12R, green sub-pixel 12G, and blue sub-pixel 12B of each pixel 12 to emit light at full brightness in sequence (only the same sub-pixel emits light at the same time). An optical instrument (not shown) is used to measure the first dominant wavelength of the red sub-pixel 12R, the second dominant wavelength of the green sub-pixel 12G, and the third dominant wavelength of the blue sub-pixel 13B of each pixel 12, and stores the position of each sub-pixel and the corresponding first dominant wavelength, second dominant wavelength, or third dominant wavelength in the storage unit 14.

[0039] See Figure 1A In the display 10, the red subpixel 12R of each pixel 12 is driven to emit light, while the green subpixel 12G and the blue subpixel 12B are completely dark. As mentioned earlier, when adjacent pixels 12 display the same single red light, most of the red subpixels 12R exhibit chromaticity C1, while the red light of other red subpixels 12R exhibits different chromaticities C2 and C3.

[0040] See also Figure 1BThe driving circuit 13 of the display 10 drives the red sub-pixels 12R in each pixel 12 to emit red light at full brightness, which has a red light main wavelength. At the same time, it drives the green sub-pixels 12G in the same pixel 12 to emit green light with a green light main wavelength at partial brightness. The color match of the light after the red light and green light are mixed will be represented by an adjusted red light main wavelength. The adjusted red light main wavelength is close to the minimum value of each first main wavelength recorded in the storage unit 14. Therefore, the red light of each red sub-pixel 12R presents chromaticity C3.

[0041] Similarly, the blue sub-pixel 12B in each pixel 12 emits blue light at full brightness with a blue light main wavelength, and the green sub-pixel 12G in the same pixel 12 emits green light at partial brightness with a green light main wavelength. The color matching of the light after the blue light and the green light are mixed will be manifested as an adjusted blue light main wavelength, which is close to a maximum value among the third main wavelengths.

[0042] Furthermore, there are two ways to adjust the color matching of the green light of the green sub-pixel 12G, as follows: (1) Drive the green sub-pixel 12G in each pixel 12 to emit green light at full brightness with a green light main wavelength, and the blue sub-pixel 12B in the same pixel 12 to emit blue light at partial brightness with a blue light main wavelength. The color matching of the light after the green light and the blue light are mixed will be expressed as an adjusted green light main wavelength. The adjusted green light main wavelength is close to the average value of each of the second main wavelengths; (2) Drive the green sub-pixel 12G in each pixel 12 to emit green light at full brightness with a green light main wavelength, and the red sub-pixel 12R in the same pixel 12 to emit red light at partial brightness with a red light main wavelength. The color matching of the light after the green light and the red light are mixed will be expressed as an adjusted green light main wavelength. The adjusted green light main wavelength is close to the average value of each of the second main wavelengths.

[0043] Figure 2A ~ Figure 2C A schematic diagram illustrating the wavelength matching of red and green light after mixing, according to an embodiment of the present invention. Figure 2A The display shows that a red subpixel 12R emits red light with a dominant wavelength of 620nm, while the green subpixel 12G in the same pixel 12 emits green light with a dominant wavelength of 510nm at a partial brightness. Figure 2B As shown. See also Figure 2C The color matching after the red light and green light are mixed will be represented by an adjusted red light main wavelength of 615nm, which is the minimum value of each first main wavelength recorded in storage unit 14.

[0044] Figure 3A ~ Figure 3C A schematic diagram illustrating the wavelength matching of blue and green light after mixing, according to an embodiment of the present invention. Figure 3AThe display shows that a blue subpixel 12B emits blue light with a dominant wavelength of 460nm, and the green subpixel 12G in the same pixel 12 emits green light with a dominant wavelength of 510nm at a partial brightness. Figure 3B As shown. See also Figure 3C The color matching after the blue light and green light are mixed will be represented by an adjusted blue light main wavelength of 465nm, which is the maximum value of each of the third main wavelengths recorded in storage unit 14.

[0045] Figure 4A ~ Figure 4C A schematic diagram illustrating the wavelength matching of green and blue light after mixing, according to an embodiment of the present invention. Figure 4A The display shows that a green subpixel 12G emits green light with a dominant wavelength of 510nm, while the blue subpixel 12B in the same pixel 12 emits blue light with a dominant wavelength of 460nm at a partial brightness. Figure 4B As shown. See also Figure 4C The color matching after the green light and blue light are mixed will be represented by an adjusted green light main wavelength of 505nm, which is the average value of each second main wavelength recorded in storage unit 14.

[0046] Figure 5A ~ Figure 5C A schematic diagram illustrating the wavelength matching of green and red light after mixing, according to an embodiment of the present invention. Figure 5A The display shows that a green subpixel 12G emits green light with a dominant wavelength of 500nm, while the red subpixel 12R in the same pixel 12 emits red light with a dominant wavelength of 620nm at a partial brightness. Figure 5B As shown. See also Figure 5C The color matching after the green light and red light are mixed will be represented by an adjusted green light main wavelength of 505nm, which is the average value of each second main wavelength recorded in storage unit 14.

[0047] Figure 6 A flowchart of a pixel chromaticity compensation method according to an embodiment of the present invention is provided. In step 601 of flowchart 600, a first pixel, a second pixel, and a third pixel of a display with a micro-light-emitting diode are driven to emit light sequentially. An optical instrument (not shown) is used to measure the first dominant wavelength of the first pixel, the second dominant wavelength of the second pixel, and the third dominant wavelength of the third pixel in each pixel, as shown in step 602. Furthermore, the position of each sub-pixel and its corresponding first, second, or third dominant wavelength can also be stored.

[0048] Referring to step 603, drive the second or third pixel in each pixel to emit light with partial brightness to mix with the first pixel in the same pixel to emit light with the first dominant wavelength, wherein the color matching of the mixed light will be represented by an adjusted first dominant wavelength, which is close to a minimum, a maximum or an average value among the measured first dominant wavelengths.

[0049] As described in the previous embodiment, according to the execution content of step 603, when the first pixel is a red sub-pixel and the second pixel is a green sub-pixel, the red sub-pixel emits red light with a red light main wavelength, and the green sub-pixel in the same pixel emits green light with a green light main wavelength at a partial brightness. The color matching of the light after the red light and the green light are mixed will be manifested as an adjusted red light main wavelength. The adjusted red light main wavelength is close to the minimum value among the measured first main wavelengths.

[0050] Furthermore, according to the execution content of step 603, when the first pixel is a blue sub-pixel and the second pixel is a green sub-pixel, the blue sub-pixel emits blue light with a blue dominant wavelength, and the green sub-pixel in the same pixel emits green light with a partial brightness and a green dominant wavelength. The color matching of the light after the blue light and the green light are mixed will be manifested as an adjusted blue dominant wavelength, which is close to the maximum value among the measured first dominant wavelengths.

[0051] Furthermore, according to the execution content of step 603, when the first pixel is a green sub-pixel, the second pixel is a blue sub-pixel, and the third pixel is a red sub-pixel, the green sub-pixel emits green light with a dominant green wavelength, and the blue sub-pixel in the same pixel emits blue light with a partial brightness and a dominant blue wavelength. The color matching of the light resulting from the mixing of the green and blue light will be represented by an adjusted dominant green wavelength, which is close to the average value of the measured first dominant wavelengths. Alternatively, if the green sub-pixel emits green light with a dominant green wavelength, and the red sub-pixel in the same pixel emits red light with a partial brightness and a dominant red wavelength, the color matching of the light resulting from the mixing of the green and red light will be represented by an adjusted dominant green wavelength, which is close to the average value of the measured first dominant wavelengths.

[0052] Although this invention has been written with reference to specific embodiments and implementations, various changes and modifications will be apparent to those skilled in the art. The aim is to include such changes and modifications that fall within the scope of the appended claims.

Claims

1. A pixel chromaticity compensation method, characterized in that, Include: In a display that drives a miniature light-emitting diode, a first pixel, a second pixel, and a third pixel emit light sequentially. Measure a first dominant wavelength of the first pixel, a second dominant wavelength of the second pixel, and a third dominant wavelength of the third pixel in each pixel; as well as The second or third pixel in each pixel is driven to emit light with partial brightness to mix with the first pixel in the same pixel emitting light with the first dominant wavelength, wherein the color matching of the mixed light will be manifested as an adjusted first dominant wavelength, which is close to a minimum, a maximum or an average value of each of the measured first dominant wavelengths.

2. The pixel chromaticity compensation method as described in claim 1, characterized in that, When the first pixel is a red sub-pixel and the second pixel is a green sub-pixel, the red sub-pixel emits red light with a red dominant wavelength, and the green sub-pixel in the same pixel emits green light with a green dominant wavelength at a partial brightness. The color matching of the light after the red light and the green light are mixed will be manifested as an adjusted red dominant wavelength, which is close to the minimum value among the measured first dominant wavelengths.

3. The pixel chromaticity compensation method as described in claim 1, characterized in that, When the first pixel is a blue sub-pixel and the second pixel is a green sub-pixel, the blue sub-pixel emits blue light with a dominant blue wavelength, and the green sub-pixel in the same pixel emits green light with a dominant green wavelength at a partial brightness. The color matching of the light after the blue light and the green light are mixed will be manifested as an adjusted dominant blue wavelength, which is close to the maximum value among the measured first dominant wavelengths.

4. The pixel chromaticity compensation method as described in claim 1, characterized in that, When the first pixel is a green sub-pixel, the second pixel is a blue sub-pixel, and the third pixel is a red sub-pixel, the green sub-pixel emits green light with a dominant green wavelength, and the blue sub-pixel in the same pixel emits blue light with a partial brightness and a dominant blue wavelength. The color matching of the light after the green light and the blue light are mixed will be manifested as an adjusted dominant green wavelength, which is close to the average value of each of the measured first dominant wavelengths.

5. The pixel chromaticity compensation method as described in claim 1, characterized in that, When the first pixel is a green sub-pixel, the second pixel is a blue sub-pixel, and the third pixel is a red sub-pixel, the green sub-pixel emits green light with a dominant green wavelength, and the red sub-pixel in the same pixel emits red light with a partial brightness and a dominant red wavelength. The color matching of the light after the green light and the red light are mixed will be manifested as an adjusted dominant green wavelength, which is close to the average value of each of the measured first dominant wavelengths.

6. A display using miniature light-emitting diodes, characterized in that, Include: Multiple pixels, each of which includes a red subpixel, a green subpixel and a blue subpixel; A storage unit stores a first dominant wavelength of the red subpixel, a second dominant wavelength of the green subpixel, and a third dominant wavelength of the blue subpixel in each pixel; and stores a maximum first dominant wavelength among the first dominant wavelengths, a maximum second dominant wavelength among the second dominant wavelengths, and a maximum third dominant wavelength among the third dominant wavelengths. A driving circuit, the driving circuit being constructed as follows: Drive one of the red, green and blue subpixels in each pixel to emit light at full brightness, while driving the other or two other subpixels to emit light at partial brightness. The color matching of the mixed light will be represented by an adjusted dominant wavelength, and each of the adjusted dominant wavelengths will be close to the same.

7. The display of a miniature light-emitting diode as described in claim 6, characterized in that, The red subpixel emits red light at full brightness and has a dominant red light wavelength. The green subpixel in the same pixel emits green light at partial brightness and has a dominant green light wavelength. The color matching of the light after the red light and the green light are mixed will be manifested as an adjusted dominant red light wavelength, which is close to the minimum value among the first dominant wavelengths.

8. The display of the miniature light-emitting diode as described in claim 6, characterized in that, The blue subpixel emits blue light at full brightness and has a dominant blue light wavelength. The green subpixel in the same pixel emits green light at partial brightness and has a dominant green light wavelength. The color matching of the light after the blue light and the green light are mixed will be manifested as an adjusted dominant blue light wavelength, which is close to the maximum value among the third dominant wavelengths.

9. The display of the miniature light-emitting diode as described in claim 6, characterized in that, The green subpixel emits green light at full brightness and has a dominant green wavelength. The blue subpixel in the same pixel emits blue light at partial brightness and has a dominant blue wavelength. The color matching of the light after the green light and the blue light are mixed will be manifested as an adjusted dominant green wavelength, which is close to an average value among the second dominant wavelengths.

10. The display of the miniature light-emitting diode as described in claim 6, characterized in that, The green subpixel emits green light at full brightness and has a dominant green wavelength. The red subpixel in the same pixel emits red light at partial brightness and has a dominant red wavelength. The color matching of the light after the green light and the red light are mixed will be manifested as an adjusted dominant green wavelength, which is close to an average value among the second dominant wavelengths.

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