TWI793761B - Method and system for full-gray scale chromaticity correction of display panel, display device and information processing device - Google Patents

Abstract

The present invention mainly discloses a full-gray-scale chromaticity correction method for a display panel, which includes: (1) In the case of driving a plurality of pixels of a display panel to display gray-scale N synchronously, according to a plurality of target luminances, a plurality of targets Chromaticity and a plurality of luminances and a plurality of chromaticities collected from the display panel are used to calculate an Nth correction parameter for grayscale correction of the plurality of pixels; (2) Repeat the step (1) , until a plurality of said pixels complete the gray scale calibration of gray scale 0 to gray scale 255 in stages; and (3) the multiple said calibrations generated during the execution of the aforementioned steps (1)~(2) The parameters are stored in a display driving circuit for driving the display panel. It is worth noting that, after using the method of the present invention to perform full-grayscale pixel correction on a display device including a display panel and a display driving circuit, the display device performs low/medium/high grayscale image display , its luminous brightness and chromaticity can be maintained uniform without color cast.

Description

Method and system for full-gray scale chromaticity correction of display panel, display device and information processing device

The present invention relates to the technical field of display devices, in particular to a method for calibrating full grayscale chromaticity of a display panel.

It is known that light-emitting diodes (Light-emitting diodes, LEDs) have many advantages such as small size, light weight, long service life, and high luminous efficiency, and have been widely used in lighting devices and display devices. The LED display device is a self-illuminating flat-panel display device, which has the advantages of bright colors, wide dynamic range, high brightness, long life, and high reliability. The LED display device with a large screen has been widely used in large squares, commercial advertisements, Sports venues, information dissemination, news releases, stock exchange venues, as a public display medium.

FIG. 1 shows a structure diagram of a conventional LED display device. As shown in Figure 1, the conventional LED display device 1a mainly includes: an LED display panel 11a and a display driving circuit 12a, the display driving circuit 12a is based on a frame synchronization signal and a frame display data transmitted from the host computer 2a. Display driving is performed on the LED display panel 11a. Traditionally, the grayscale (brightness) of each LED pixel is precisely controlled by controlling the magnitude of the LED current and its conduction time. The on-time control method is to control the grayscale of the LED by changing the duty cycle under the condition of constant current driving. For example, in order to display a frame of image, 16-bit grayscale data is provided for each LED pixel.

As the application fields of the LED display device 1a become wider and wider, the requirements for the resolution and display effect of the LED display device 1a are also higher and higher. It should be understood that the more LED elements (ie, sub-pixels) the LED display panel 11a has, the higher the resolution of the LED display device 1a will be. It is a pity that each LED element of the LED display panel 11 a cannot display exactly the same luminous characteristics due to process drift or error. In this case, it is impossible to make each LED element display the same luminous brightness by constant current driving, resulting in a color shift phenomenon of the LED display panel 11a. In particular, with the As the spacing becomes smaller and smaller (especially ≦1mm), when the LED display panel 11a is displaying low-gray-scale images, the phenomenon of uneven luminous brightness and color shift becomes more obvious.

Currently, the industry uses a point-by-point calibration and compensation method to perform pixel-by-pixel compensation on the LED display panel 11a. When performing point-by-point correction compensation, the tristimulus values (ie, X , Y , Z ) of each pixel must be measured when it displays the highest gray level. Next, a corresponding conversion parameter is generated according to a target tristimulus value of the pixel and the measured tristimulus value, and then the conversion parameter is stored in the display driving chip of the display driving circuit 12a.

Practical experience points out that the conversion parameters obtained by using the point-by-point correction compensation method exhibit a very good (gray-scale) compensation effect when the LED display panel 11a performs high-gray-scale display. However, when the LED display panel 11a performs low-grayscale display, especially 1-10 grayscale and 0-1 grayscale, the conversion parameter method will cause the display effect to deteriorate instead. To explain in more detail, when the conversion parameters obtained by using the point-by-point correction compensation method are used for low-gray-scale pixel compensation, the brightness and chromaticity of a certain gray-scale will be normal, but the brightness and chromaticity of another gray-scale will be normal. An inconsistency has occurred. In other words, the conversion parameters obtained by using the point-by-point calibration and compensation method of the conventional technology cannot satisfy the full gray scale compensation of each pixel of the LED display panel 11a.

It can be seen from the above description that there is an urgent need in the art for a new full-gray-scale chromaticity calibration method for LED display panels.

The main purpose of the present invention is to provide a full-gray-scale chromaticity correction method for a display panel, which is used to perform full-gray-scale pixel correction on a display device including a display panel and a display driving circuit, thereby generating a corresponding full-gray scale Multiple (256) calibration parameters are stored in a storage unit of the display driving circuit. After using the method of the present invention to perform full-gray-scale pixel correction on the display device, when the display device displays low/medium/high gray-scale images, its luminous brightness and chromaticity can maintain uniformity and There will be a color cast.

In order to achieve the above object, the present invention proposes an embodiment of the method for correcting the full grayscale chromaticity of the display panel, which includes the following steps: (1) In the case of driving a plurality of pixels of a display panel to synchronously display grayscale N, it is calculated based on a plurality of target luminances, a plurality of target chromaticities, and a plurality of luminances and a plurality of chromaticities collected from the display panel Obtain an Nth correction parameter for performing grayscale correction on a plurality of pixels; wherein, N is a value selected from 0 to 255; (2) repeatedly execute the step (1) until the complex number The gray scale correction of gray scale 0 to gray scale 255 is completed in stages for each of the pixels; and (3) the plurality of correction parameters generated during the execution of the aforementioned steps (1) to (2) are stored in the In a display driving circuit for driving the display panel.

In one embodiment, the step (1) includes the following detailed execution steps: (11) Utilize the display driving circuit to drive a plurality of pixels of the display panel to synchronously display the gray scale N, and collect the plurality of pixels from the display panel brightness and the plurality of chromaticities; (12) perform a correction parameter calculation according to the plurality of luminances, the plurality of chromaticities, the plurality of target luminances, and the plurality of target chromaticities, thereby generating the The Nth correction parameter; (13) storing the Nth correction parameter in the display drive circuit, and using the display drive circuit again to drive a plurality of pixels of the display panel to display the gray scale N synchronously, and then again from the display The panel collects the plurality of luminances and the plurality of chromaticities; (14) judging whether the plurality of luminances and the plurality of chromaticities meet the plurality of target luminances and the plurality of target chromaticities; if so, Then execute step (15); if not, return to step (11); and (15) add 1 or subtract 1 to N.

In one embodiment, the display driving circuit includes a control unit, a display driving unit and a memory unit, and the plurality of calibration parameters are stored in the storage unit.

In another embodiment, the display driving circuit includes a control unit and a display driving unit, and the plurality of calibration parameters are stored in a storage unit of the display driving unit.

Moreover, in order to achieve the above object, the present invention proposes an embodiment of a full-gray-scale chromaticity correction system for a display panel, which includes: a host computer coupled to the display driving circuit; and A camera, coupled to the host computer, and facing the display panel; wherein, the host computer executes a full-grayscale chromaticity calibration method to perform full-grayscale images on a display device including a display driving circuit and a display panel pixel correction, and the full grayscale chromaticity correction method includes the following steps: (1) in the case of using the display drive circuit to drive a plurality of pixels of the display panel to display the grayscale N synchronously, according to the plurality of target brightness, A plurality of target chromaticities and a plurality of luminances and a plurality of chromaticities collected by the camera from the display panel are used to calculate an Nth correction parameter for grayscale correction of the plurality of pixels; wherein, N is A value selected from 0 to 255; (2) repeating the step (1) until the plurality of pixels complete the gray scale calibration of gray scale 0 to gray scale 255; and (3) The plurality of calibration parameters generated during the execution of the aforementioned steps (1)-(2) are stored in the display driving circuit.

In an embodiment In an embodiment, the step (1) includes the following detailed execution steps: (11) using the display driving circuit to drive a plurality of pixels of the display panel to display the gray scale N synchronously, and from the display panel Collecting the plurality of luminances and the plurality of chromaticities; (12) performing a calibration parameter according to the plurality of luminances, the plurality of chromaticities, the plurality of target luminances, and the plurality of target chromaticities operation, thereby generating the Nth correction parameter; (13) storing the Nth correction parameter in the display drive circuit, and using the display drive circuit again to drive a plurality of pixels of the display panel to display gray scale N synchronously, Then collect the plurality of luminances and the plurality of chromaticities from the display panel again; (14) judge whether the plurality of luminances and the plurality of chromaticities satisfy the plurality of target luminances and the plurality of targets Chroma; if yes, execute step (15); if no, return to step (11); and (15) add 1 or subtract 1 to N.

In one embodiment, the display driving circuit includes a control unit, a display driving unit and a memory unit, and the plurality of calibration parameters are stored in the storage unit.

In another embodiment, the display driving circuit includes a control unit and a display driving unit, and the plurality of calibration parameters are stored in a storage unit of the display driving unit.

Moreover, the present invention also proposes a display device, which includes a display panel and a display driving circuit, wherein the display driving circuit includes 256 calibration parameters, and the 256 calibration parameters are executed by a host computer. It is produced by the full grayscale chromaticity correction method of the display panel invented.

In one embodiment, the display panel is selected from a light emitting diode display panel, a quantum dot light emitting diode display panel, a micro light emitting diode display panel, a submillimeter light emitting diode display panel, a perovskite A flat display panel in the group consisting of a light emitting diode display panel and an organic light emitting diode display panel.

Further, the present invention also proposes an information processing device, which has the display device of the present invention as described above, and the information processing device is selected from video walls, smart phones, smart watches, smart bracelets, tablet computers, An electronic device in the group consisting of notebook computers, all-in-one computers, and outdoor station devices.

1a: LED display device

11a: LED display panel

12a: Display drive circuit

2a: PC

1: Display device

11: Display panel

12: Display drive circuit

120: Control unit

121: Display drive unit

1211: storage unit

122: memory unit

2: Full grayscale chroma correction system

21: PC

22: Camera

S1: In the case of driving a plurality of pixels of a display panel to synchronously display grayscale N, it is calculated based on a plurality of target luminances, a plurality of target chromaticities, and a plurality of luminances and a plurality of chromaticities collected from the display panel An Nth correction parameter for performing grayscale correction on the plurality of pixels

S2: Repeat this step S1 until the gray scale calibration of gray scale 0 to gray scale 255 is completed for a plurality of pixels

S3: storing the plurality of correction parameters generated during the execution of the aforementioned steps S1 to S2 into the display driving circuit

S11: Utilize the display driving circuit to drive a plurality of pixels of the display panel to display grayscale N synchronously, and collect the plurality of luminances and the plurality of chromaticities from the display panel

S12: Perform a correction parameter calculation according to the plurality of luminances, the plurality of chromaticities, the plurality of target luminances, and the plurality of target chromaticities, so as to generate the Nth correction parameter

S13: store the Nth correction parameter in the display driving circuit, and use the display driving circuit to drive the plurality of pixels of the display panel to synchronously display grayscale N, and then collect the plurality of pixels from the display panel again luminance and the complex number of chromaticities

S14: Determine whether the plurality of luminances and the plurality of chromaticities satisfy the plurality of target luminances and the plurality of target chromaticities?

S15: Add 1 or subtract 1 to N

Fig. 1 is a structure diagram of a conventional LED display device; Fig. 2 is a structure diagram of a full-gray-scale chromaticity correction system of a display panel according to the present invention; Fig. 3 is a first view of the display device shown in Fig. 2 Architecture diagram; FIG. 4 is a flow chart of a full-gray-scale chromaticity correction method for a display panel of the present invention; FIG. 5 is a flow chart of the detailed steps of step S1 in FIG. 4; and FIG. 6 is shown in FIG. 2 The second architecture diagram of the display device in .

In order to enable your examiners to further understand the structure, features, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred embodiments are hereby attached.

FIG. 2 is a structural diagram of a full-grayscale chromaticity correction system for a display panel according to the present invention. A full-gray-scale chromaticity correction system 2 for a display panel of the present invention is used to perform full-gray-scale pixel calibration on a display device 1 including a display panel 11 and a display driving circuit 12, so as to generate a corresponding full-gray-scale complex Several calibration parameters are stored in the display driving circuit. As shown in FIG. 2 , the full grayscale chromaticity calibration system 2 mainly includes: a host computer 21 and a camera 22 , wherein the host computer 21 is coupled to the display driving circuit 12 through an adapter board. On the other hand, the camera 22 is coupled to the host computer 21 for facing the display panel 11 for taking pictures.

FIG. 3 is a first structural diagram of the display device 1 shown in FIG. 2 . Moreover, FIG. 4 shows a flow chart of a full-gray-scale chromaticity calibration method for a display panel of the present invention. When performing full-gray-scale pixel correction on the display device 1, as shown in FIGS. In the case of displaying the gray scale N, it is calculated based on the multiple target luminances, the multiple target chromaticities, and the multiple luminances and multiple chromaticities collected from the display panel by the camera to perform the calculation for the multiple pixels. An Nth correction parameter of the grayscale correction; wherein, N is a value selected from 0 to 255. After step S1 is completed, the host computer 21 then executes step S2: repeating the step (1) until the gray scale calibration of gray scale 0 to gray scale 255 is completed for a plurality of pixels. Finally, the host computer 21 then executes step S3 : storing the plurality of calibration parameters generated during the execution of the aforementioned steps S1 - S2 into the display driving circuit 12 .

FIG. 5 shows a flow chart of the detailed steps of step S1 in FIG. 4 . To further illustrate, when step S1 is executed, the host computer 21 firstly executes step S11: using the display drive circuit 12 to drive a plurality of pixels of the display panel 11 to display the grayscale N synchronously, and collect the displayed grayscale N from the display panel 11. The plurality of lumas and the plurality of chromas. Next, in step S12, the host computer 21 performs a correction parameter calculation according to the plurality of luminances, the plurality of chromaticities, the plurality of target luminances, and the plurality of target chromaticities, thereby generating the The Nth correction parameter.

Further, in step S13, the host computer 21 stores the Nth correction parameter in the display driving circuit 12, and uses the display driving circuit 12 to drive the plurality of pixels of the display panel 11 to simultaneously display gray Step N, and then collect the plurality of luminances and the plurality of chromaticities from the display panel 11 again. Next, in step S14, the host computer 21 judges whether the plurality of luminances and the plurality of chromaticities meet the plurality of target luminances and the plurality of target chromaticities (that is, whether they meet the preset target value). If yes, step S15 is then executed to add or subtract 1 to N, and then step S2 as shown in FIG. 4 is executed. It is worth noting that if the judgment result of step S14 is no, the method flow It will return to step S11, that is, pixel correction must be performed again under the condition that the plurality of pixels display the gray scale N synchronously.

To explain in more detail, after the present invention uses steps S1 to S3 to perform full grayscale compensation of 0 to 255 on each pixel of the display panel 11, when each pixel is performing grayscale display, no matter it is a low grayscale, such as 1-10, or high grayscale, such as 240-250, have actually verified corresponding grayscale compensation parameters that can be used to show the best display effect. For example, the present invention sends the 1-255 grayscale pictures of R, G, B and white light to the display panel 11 for display respectively and step by step, and then collects the brightness and chromaticity coordinate values of each pixel to obtain the (R, G , B) value. For example, the measured values of a certain pixel under a certain gray scale are R ₁ , G ₁ , B ₁ , the present invention is based on R ₁ , G ₁ , B ₁ and the target values R ₂ , G ₂ , B ₂ set by demand. A set of correction coefficients [Cr, Crg, Crb, Cg, Cgr, Cgb, Cb, Cbr, Cbg] of the pixel in the gray scale can be obtained, and then (R ₁ * Cr+G ₁ * Crg+B ₁ * Crb, G ₁ * Cg+R ₁ * Cgr+B ₁ * Cgb, B ₁ * Cb+R ₁ * Cbr+G ₁ * Cbg) to drive the display panel 11 to update the display of the pixel; Brightness and chromaticity coordinate values to obtain new measured values R ₃ , G ₃ , B ₃ , and then judge whether the values of R ₃ , G ₃ , B ₃ are within the corresponding surrounding range of target values R ₂ , G ₂ , B ₂ to decide whether to repeat the calculation and correction again.

As shown in FIGS. 2 and 3 , generally, the display driving circuit 12 includes a control unit 120 , a display driving unit 121 including at least one display driving chip, and a memory unit 122 . Therefore, after completing the full-grayscale pixel calibration procedure of the display device 1 according to the method flow shown in FIG. 4 and FIG. 5 , the host computer 21 stores the obtained multiple calibration parameters in the memory unit 122 .

On the other hand, FIG. 6 shows a second structural diagram of the display device 1 shown in FIG. 2 . As shown in FIG. 2 and FIG. 6 , in a feasible embodiment, the display driving circuit 12 includes a control unit 120 and a display driving unit 121 including a storage unit 1211 . Therefore, after completing the full-gray-scale pixel calibration procedure of the display device 1 according to the method flow shown in FIG. 4 and FIG. unit 1211; that is, stored in the display driver chip.

In this way, the above has completely and clearly described a full-gray-scale chromaticity correction method for a display panel of the present invention; and, through the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a full-gray-scale chromaticity correction method for a display panel, which is used to perform full-gray-scale pixel correction on a display device including a display panel and a display driving circuit, thereby generating a complex number corresponding to the full-gray scale (256) calibration parameters are stored in a storage unit of the display driving circuit. After using the method of the present invention to perform full-gray-scale pixel correction on the display device, when the display device displays low/medium/high gray-scale images, its luminous brightness and chromaticity can maintain uniformity and There will be a color cast.

(2) The present invention also provides a display device, which includes a display panel and a display drive circuit, wherein the display drive circuit includes 256 calibration parameters, and the 256 calibration parameters are executed by a host computer as described above The display panel of the present invention is produced by the full-gray-scale chromaticity correction method. Wherein, the display panel is selected from light emitting diode display panels, quantum dot light emitting diode display panels, micro light emitting diode display panels, submillimeter light emitting diode display panels, perovskite light emitting diode display panels, A flat display panel in the group consisting of a display panel and an organic light emitting diode display panel.

(3) Further, the present invention also proposes an information processing device, which has the display device of the present invention as described above, and the information processing device is selected from a video wall, a smart phone, a smart watch, a smart bracelet, An electronic device in the group consisting of a tablet computer, a notebook computer, an all-in-one computer, and an outdoor station device.

It must be emphasized that what is disclosed in the above-mentioned case is a preferred embodiment, and all partial changes or modifications derived from the technical ideas of this case and easily deduced by those familiar with the technology are all inseparable from the patent of this case. category of rights.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand it clearly and grant a patent as soon as possible. Society is for the Most Prayer.

S1: In the case of driving a plurality of pixels of a display panel to synchronously display grayscale N, it is calculated based on a plurality of target luminances, a plurality of target chromaticities, and a plurality of luminances and a plurality of chromaticities collected from the display panel An Nth correction parameter for performing grayscale correction on the plurality of pixels

S2: Repeat this step S1 until the gray scale calibration of gray scale 0 to gray scale 255 is completed for a plurality of pixels

S3: storing the plurality of correction parameters generated during the execution of the aforementioned steps S1 to S2 into the display driving circuit

Claims (10)

A method for correcting full-gray-scale chromaticity of a display panel, comprising the following steps: (1) under the condition of driving a plurality of pixels of a display panel to synchronously display gray-scale N, according to a plurality of target luminances and a plurality of target chromaticity And an Nth correction parameter for gray scale correction of the plurality of pixels is calculated from the plurality of luminances and the plurality of chromaticities collected from the display panel; wherein, N is selected from 0 to 255 (2) repeatedly execute the step (1) until the plurality of pixels complete the gray scale calibration from gray scale 0 to gray scale 255; and (3) perform the step (1) to The plurality of calibration parameters generated during the execution of 2) are stored in a display driving circuit used to drive the display panel. The full-gray-scale chromaticity correction method for a display panel as described in Claim 1, wherein the step (1) includes the following detailed execution steps: (11) using the display driving circuit to drive a plurality of pixels of the display panel to display synchronously gray scale N, and collect the plurality of luminances and the plurality of chromaticities from the display panel; (12) according to the plurality of luminances, the plurality of chromaticities, the plurality of target luminances and the complex A correction parameter operation is performed for a target chromaticity, thereby generating the Nth correction parameter; (13) storing the Nth correction parameter in the display drive circuit, and using the display drive circuit to drive the complex number of the display panel again A pixel synchronously displays the gray scale N, and then collects the plurality of luminances and the plurality of chromaticities from the display panel again; (14) judging whether the plurality of luminances and the plurality of chromaticities satisfy the complex number target luminance and the plurality of target chromaticities; if yes, execute step (15); if not, return to step (11); and (15) add 1 or subtract 1 to N. The full-gray-scale chromaticity calibration method of a display panel as described in Claim 2, wherein the display driving circuit includes a control unit, a display driving unit and a memory unit, and a plurality of the correction parameters are stored in the memory within the unit. The full-gray-scale chromaticity calibration method for a display panel as described in Claim 2, wherein the display driving circuit includes a control unit and a display driving unit, and the plurality of calibration parameters are stored in a display driving unit inside the storage unit. A full grayscale chromaticity correction system for a display panel, comprising: a host computer coupled to a display drive circuit; and a camera coupled to the host computer and facing the display panel; wherein, the host computer executes a full A method for correcting grayscale chromaticity is used to perform full grayscale pixel correction on a display device including the display drive circuit and the display panel, and the method for correcting full grayscale chromaticity includes the following steps: (1) using the display When the driving circuit drives the plurality of pixels of the display panel to display the grayscale N synchronously, according to the plurality of target luminances, the plurality of target chromaticities and the plurality of luminances and the plurality of chromaticities collected from the display panel by the camera Calculating an Nth correction parameter for performing grayscale correction on the plurality of pixels; wherein, N is a value selected from 0 to 255; (2) repeatedly executing the step (1) until A plurality of said pixels complete the gray scale calibration from gray scale 0 to gray scale 255 in stages; and (3) storing the plurality of said calibration parameters generated during the execution of the aforementioned steps (1) to (2) to the display driver circuit. The full-gray-scale chromaticity correction system of the display panel as described in claim 5, wherein the step (1) includes the following detailed execution steps: (11) using the display driving circuit to drive a plurality of pixels of the display panel to display synchronously gray scale N, and collect the plurality of luminances and the plurality of chromaticities from the display panel; (12) according to the plurality of luminances, the plurality of chromaticities, the plurality of target luminances and the complex A correction parameter operation is performed for a target chromaticity, thereby generating the Nth correction parameter; (13) storing the Nth correction parameter in the display drive circuit, and using the display drive circuit to drive the complex number of the display panel again A pixel synchronously displays the gray scale N, and then collects the plurality of luminances and the plurality of chromaticities from the display panel again; (14) judging whether the plurality of luminances and the plurality of chromaticities satisfy the plurality of target luminances and the plurality of target chromaticities; if so, perform step (15); if not, return to this step ( 11); and (15) adding or subtracting 1 to N. The full-gray-scale chromaticity calibration system for a display panel as described in Claim 6, wherein the display driving circuit includes a control unit, a display driving unit and a memory unit, and a plurality of the correction parameters are stored in the memory within the unit. The full-gray-scale chromaticity calibration system for a display panel as described in claim 6, wherein the display driving circuit includes a control unit and a display driving unit, and the plurality of calibration parameters are stored in a display driving unit inside the storage unit. A display device, which includes a display panel and a display drive circuit, wherein the display drive circuit includes 256 calibration parameters, and the 256 calibration parameters are executed by a host computer as any one of claim 1 to claim 4 It is generated by the full-gray-scale chromaticity correction method of the display panel described in the item. An information processing device, which has the display device as described in claim 9, and it is selected from video walls, smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and doorways An electronic device in the group consisting of computer devices.

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