CN114495817A - Calibration method and calibration device applied to display panel - Google Patents

Calibration method and calibration device applied to display panel Download PDF

Info

Publication number
CN114495817A
CN114495817A CN202110006398.XA CN202110006398A CN114495817A CN 114495817 A CN114495817 A CN 114495817A CN 202110006398 A CN202110006398 A CN 202110006398A CN 114495817 A CN114495817 A CN 114495817A
Authority
CN
China
Prior art keywords
display area
sub
display
optical measurement
compensation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110006398.XA
Other languages
Chinese (zh)
Other versions
CN114495817B (en
Inventor
谢升勲
邵广一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kunshan Ruichuangsin Electronics Co ltd
Original Assignee
Kunshan Ruichuangsin Electronics Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kunshan Ruichuangsin Electronics Co ltd filed Critical Kunshan Ruichuangsin Electronics Co ltd
Publication of CN114495817A publication Critical patent/CN114495817A/en
Application granted granted Critical
Publication of CN114495817B publication Critical patent/CN114495817B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A calibration method applied to a display panel includes: (a) removing uneven display in a first display area and a second display area of the display panel; (b) performing optical measurement on the first display area and the second display area to obtain a first optical measurement value of the first display area and a second optical measurement value of the second display area; (c) performing AC calibration on the first and second display areas to eliminate an AC error between the first optical measurement value of the first display area and the second optical measurement value of the second display area; and (d) performing DC calibration on the second display area to eliminate DC error between the second optical measurement value of the second display area and the first optical measurement value of the first display area, so that the calibrated second optical measurement value of the second display area can be consistent with the first optical measurement value of the first display area.

Description

Calibration method and calibration device applied to display panel
Technical Field
The present invention relates to a display panel, and more particularly, to a calibration method and a calibration apparatus for a display panel.
Background
In general, in an application product of an under-screen camera, an Organic Light Emitting Diode (OLED) display panel generally includes different display regions, such as a main screen having a high pixel density (PPI) and a sub-screen having a low pixel density (PPI). Since the sub-screen needs to have a certain light transmittance, and the sub-screen is obviously different from the main screen in circuit design, pixel distribution and material selection, it is one of the current technical problems how to make the brightness and color coordinates of the sub-screen consistent with those of the main screen.
At present, a commonly used solution is to adjust Gamma (Gamma) values of a main screen and a sub screen, and then adjust brightness ratio coefficients of red (R)/green (G)/blue (B) of the main screen and the sub screen respectively in a display unevenness removal (Demura) manner, so that brightness/color coordinates of a monolithic Organic Light Emitting Diode (OLED) display panel can meet requirements on specifications.
However, in actual mass production, due to the influence of Gamma (Gamma) adjustment precision, photo exposure precision, and other factors, the large difference between different oled display panels produced by using the same set of parameters is easily caused, which affects the yield of the whole mass production and even causes the mass production not to be successful, so further overcoming is urgently needed.
Disclosure of Invention
Accordingly, the present invention is directed to a calibration method and a calibration apparatus for a display panel, which effectively solve the above-mentioned problems encountered in the prior art.
An embodiment of a calibration method for a display panel is provided. In this embodiment, the display panel includes a first display area and a second display area. The calibration method comprises the following steps: (a) removing display unevenness (Demura) of the first display area and the second display area; (b) performing optical measurement on the first display area and the second display area to obtain a first optical measurement value of the first display area and a second optical measurement value of the second display area; (c) performing AC calibration on the first display area and the second display area to eliminate AC errors between the first optical measurement value of the first display area and the second optical measurement value of the second display area; and (d) performing DC calibration on the second display area (the secondary screen) to eliminate DC errors between the second optical measurement value of the second display area and the first optical measurement value of the first display area, so that the calibrated second optical measurement value of the second display area can be consistent with the first optical measurement value of the first display area.
In one embodiment, the first display area has a first pixel density and the second display area has a second pixel density, and the first pixel density is equal to or different from the second pixel density.
In one embodiment, the first optical measurement and the second optical measurement are luminance or color coordinates.
In one embodiment, the step (d) is performed by performing a DC calibration on the second display Region by using a Multi-Region Compensation (MRC) method.
In one embodiment, the multi-region compensation method comprises the following steps: (d1) defining positions of a plurality of sub-display areas in the second display area; (d2) counting a plurality of optical measurement values of the plurality of sub-display areas to obtain current statistical data; (d3) generating a plurality of DC compensation values corresponding to the plurality of sub-display areas according to the current statistical data; and (d4) respectively performing DC compensation on the plurality of optical measurement values of the plurality of sub-display areas in the second display area according to the plurality of DC compensation values, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area all tend to be consistent with the first optical measurement value of the first display area.
In one embodiment, the step (d3) includes obtaining a difference between the optical measurement values of the sub-display areas in the second display area DA2 and the first optical measurement value of the first display area DA1 according to the current statistical data, and obtaining the DC compensation values accordingly.
In one embodiment, the DC offset may be finer than a gray level.
In one embodiment, the sub-display regions in the second display region DA2 are represented by a red-green-blue (RGB) system, a red-green-blue-white (RGBW) system, an Amber-green-blue (Amber GB) system, or a Yellow-Cyan-Magenta (Yellow-Cyan Magenta) system.
In one embodiment, the calibration method further comprises the following steps: under the same gray scale binding point, adjusting DC compensation values of a first sub-display area, a second sub-display area and a third sub-display area in a second display area, so that optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area in the second display area can be approximately consistent with a first optical measurement value of the first display area; acquiring a DC compensation value of the first sub-display area, a DC compensation value of the second sub-display area and a DC compensation value of the third sub-display area; and obtaining DC compensation values of other gray scale binding points in a linear interpolation mode.
In one embodiment, the calibration method further comprises the following steps: under the same gray scale binding point, simultaneously lightening a first sub-display area, a second sub-display area and a third sub-display area in different proportions in a second display area to form a fourth sub-display area, and adjusting DC compensation values of the first sub-display area, the second sub-display area and the third sub-display area to enable optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area to be consistent with a first optical measurement value of the first display area; acquiring a DC compensation value of the fourth sub-display area relative to the first sub-display area, a DC compensation value of the fourth sub-display area relative to the second sub-display area, a DC compensation value of the fourth sub-display area relative to the third sub-display area, a DC compensation value of the first sub-display area, a DC compensation value of the second sub-display area and a DC compensation value of the third sub-display area; and obtaining DC compensation values of other gray scale binding points in a linear interpolation mode.
Another embodiment of the present invention is a calibration apparatus for a display panel. In this embodiment, the display panel includes a first display region and a second display region. The calibration device comprises a display unevenness removal (Demura) module, an optical measurement module, an AC calibration module and a DC calibration module. The display unevenness removing module is used for removing display unevenness (Demura) of the first display area and the second display area. The optical measurement module is used for performing optical measurement on the first display area and the second display area to obtain a first optical measurement value of the first display area and a second optical measurement value of the second display area. The AC calibration module is used for AC calibrating the first display area and the second display area to eliminate AC errors between the first optical measurement value of the first display area and the second optical measurement value of the second display area. The DC calibration module is used for carrying out DC calibration on the second display area so as to eliminate DC errors between the second optical measurement value of the second display area and the first optical measurement value of the first display area, so that the calibrated second optical measurement value of the second display area can be consistent with the first optical measurement value of the first display area.
In one embodiment, the first display area has a first pixel density and the second display area has a second pixel density, the first pixel density and the second pixel density being equal or different.
In one embodiment, the first optical measurement and the second optical measurement are luminance or color coordinates.
In one embodiment, the DC calibration module performs DC calibration on the second display Region by using a Multi-Region Compensation (MRC) method.
In one embodiment, the DC calibration module includes: a defining unit for defining the positions of the sub-display areas in the second display area; a statistic unit for counting a plurality of optical measurement values of the plurality of sub-display areas to obtain current statistic data; a generating unit for generating a plurality of DC offset values corresponding to the plurality of sub-display areas according to the current statistical data; and a compensation unit for performing DC compensation on the plurality of optical measurement values of the plurality of sub-display areas in the second display area according to the plurality of DC compensation values, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area and the first optical measurement value of the first display area tend to be consistent.
In one embodiment, the generating unit obtains the difference between the optical measurements of the sub-display areas in the second display area and the first optical measurement of the first display area according to the current statistic data, and obtains the DC offset values accordingly.
In one embodiment, the fineness of the DC compensation performed by the compensation unit can be less than a gray level.
In one embodiment, the sub-display regions in the second display region are represented by a red-green-blue (RGB) system, a red-green-blue-white (RGBW) system, an Amber-green-blue (Amber GB) system, or a Yellow-Cyan-Magenta (Yellow-Cyan Magenta) system.
In an embodiment, under the same gray level tie point, the DC calibration module further adjusts DC compensation values of a first sub-display area, a second sub-display area and a third sub-display area in the second display area, so that optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area in the second display area can be approximately consistent with the first optical measurement value of the first display area, so as to obtain a DC compensation value of the first sub-display area, a DC compensation value of the second sub-display area and a DC compensation value of the third sub-display area, and obtain DC compensation values of other gray level tie points by linear interpolation.
In one embodiment, under the same gray level binding point, the DC calibration module further lights up the first sub-display area, the second sub-display area and the third sub-display area of the second display area in different proportions to form a fourth sub-display area, and adjusts the DC compensation values of the first sub-display area, the second sub-display area and the third sub-display area to make the optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area tend to be consistent with the first optical measurement value of the first display area, and obtains the DC compensation value of the fourth sub-display area relative to the first sub-display area, the DC compensation value of the fourth sub-display area relative to the second sub-display area, the DC compensation value of the fourth sub-display area relative to the third sub-display area, the DC compensation value of the first sub-display area, And the DC compensation value of the second sub-display area and the DC compensation value of the third sub-display area are obtained by a linear interpolation mode.
Compared with the prior art, the calibration method and the calibration apparatus applied to the display panel according to the present invention remove the display mura (Demura) and obtain the respective optical measurement values (e.g. brightness/color coordinates) after completing the removal of the display mura in the first display area (e.g. main screen) and the second display area (e.g. sub screen) of the display panel, first, the first display area (e.g., main screen) and the second display area (e.g., sub-screen) are AC calibrated, and then the second display area (e.g., sub-screen) is DC calibrated by, for example, Multi-Region Compensation (MRC), such that the DC error between the two, so that the optical measurement (e.g., luminance/color coordinates) of the second display area (e.g., the sub-screen) can be aligned with the optical measurement (e.g., luminance/color coordinates) of the first display area (e.g., the main screen).
The advantages and spirit of the present invention can be further understood by the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a display panel including a first display region and a second display region.
Fig. 2A and 2B are schematic diagrams illustrating AC calibration and DC calibration performed on a first display area and a second display area of a display panel.
Fig. 3 is a diagram illustrating DC Offset (Offset) of red (R)/green (G)/blue (B) compensation values of a sub-screen of a display panel by a binding manner.
FIG. 4 is a flowchart of a calibration method applied to a display panel according to a preferred embodiment of the present invention.
Fig. 5 is a flow chart of a DC calibration method.
Fig. 6 is a schematic diagram of DC offset values obtained by respectively performing DC offset on a white (W) picture and a red (R)/green (G)/blue (B) picture under the same gray level binding to adjust the main screen and the sub screen to be consistent.
Fig. 7 is a correspondence relationship between the luminance ratio coefficient of red and the DC offset.
FIG. 8 is a schematic diagram of a calibration apparatus applied to a display panel according to another preferred embodiment of the present invention.
Fig. 9 is a schematic diagram of a DC calibration module.
Description of the main element symbols:
PL.
A first display area
Second display area
Dif
R
G
B
Calibration device
Removing a display mura module
An optical measurement module
AC calibration module
DC calibration module
S10-S16
S20-S26
Input data
Data after DAT
160
A statistical unit
164
A compensation unit
A synthesis unit
Gt1
Gt2
Gt3
DC compensation value DC _ R, DC _ G, DC _ B, DC _ W _ R, DC _ W _ G, DC _ W _ b
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. The same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.
An embodiment of the invention is a calibration method applied to a display panel. In this embodiment, the display panel may be an Organic Light Emitting Diode (OLED) display panel, but is not limited thereto. The display panel PL includes a plurality of display regions, and the positions and shapes of the plurality of display regions are not particularly limited, for example, the display panel PL in fig. 1 includes a first display region DA1 and a second display region DA2, but not limited thereto.
The first display area DA1 and the second display area DA2 respectively include a plurality of pixels (pixels). Assuming that the first display area DA1 has a first pixel density and the second display area DA2 has a second pixel density, the first pixel density of the first display area DA1 and the second pixel density of the second display area DA2 may be equal or different, for example, the first display area DA1 and the second display area DA2 may represent a main panel with a high pixel density and a sub-panel with a low pixel density, respectively, but not limited thereto.
In this embodiment, the calibration method of the present invention may first remove the display unevenness (Demura) in the first display area DA1 and the second display area DA2 of the display panel PL, and then perform optical measurement on the first display area DA1 and the second display area DA2 to obtain a first optical measurement value of the first display area DA1 and a second optical measurement value of the second display area DA 2. In fact, the first optical measurement value and the second optical measurement value may be, but not limited to, brightness or color coordinates.
Then, the calibration method of the present invention may perform AC calibration on the first display area DA1 and the second display area DA2 to eliminate the AC error between the first optical measurement value of the first display area DA1 and the second optical measurement value of the second display area DA2, as shown in fig. 2A.
However, as shown in fig. 2A, although the AC error between the first optical measurement value of the first display area DA1 and the second optical measurement value of the second display area DA2 has been eliminated, a DC error DIF still exists between the first optical measurement value of the first display area DA1 and the second optical measurement value of the second display area DA 2.
Therefore, as shown in fig. 2B, the calibration method of the present invention can further perform DC calibration on the second display area DA2 to eliminate the DC error DIF between the second optical measurement value of the second display area DA2 and the first optical measurement value of the first display area DA1, so that the second optical measurement value of the second display area DA2 can be aligned with the first optical measurement value of the first display area DA1 after DC calibration. Therefore, the optical measurement values (such as brightness or color coordinates) of the second display area DA2 (the sub-panel) can be consistent with the optical measurement values of the first display area DA1 (the main panel), so that the problems encountered in the prior art can be effectively overcome.
In practical applications, the calibration method of the present invention may use a Multi-Region Compensation (MRC) method to perform DC calibration on the second display Region DA2, but is not limited thereto.
In an embodiment, referring to fig. 4, the multi-region compensation method adopted by the calibration method of the present invention may include the following steps:
step S10: defining positions of a plurality of sub display areas in the second display area DA 2;
step S12: counting a plurality of optical measurement values of the plurality of sub-display areas to obtain current statistical data;
step S14: generating a plurality of DC compensation values corresponding to the plurality of sub-display areas according to the current statistical data; and
step S16: the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 are DC-compensated according to the plurality of DC compensation values, respectively, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 all tend to coincide with the first optical measurement value of the first display area DA 1.
In practical applications, the fineness of the DC compensation performed in step S16 may be less than a gray level, but not limited thereto.
In another embodiment, the step S14 can obtain the difference between the optical measurement values of the sub-display areas in the second display area DA2 and the first optical measurement value of the first display area DA1 according to the current statistical data, and accordingly obtain the DC compensation values, but not limited thereto.
In detail, referring to fig. 5, the multi-region compensation method adopted by the calibration method of the present invention may further include the following steps:
step S20: after the display unevenness (Demura) and AC calibration are removed from the first display area DA1 and the second display area DA2, a DC error still exists between the optical measurement values of the first display area DA1 and the second display area DA 2;
step S22: changing the input gray scale to measure a plurality of DC offset values corresponding to the plurality of sub display areas in the second display area DA 2;
step S24: respectively calculating compensation parameters of different colors (such as red (R), green (G) and blue (B)) of the multi-region compensation; and
step S26: the components of different colors (e.g., red (R), green (G), and blue (B)) are counted and the DC offset output is reset accordingly so that it matches the measured data.
In practical applications, the sub-display regions of the second display region DA2 can be represented by, for example, a red-green-blue (RGB) system, a red-green-blue-white (RGBW) system, an Amber-green-blue (Amber GB) system, or a Yellow-Cyan-Magenta (Yellow-Cyan Magenta) system, but not limited thereto.
In one embodiment, if the sub-display areas in the second display area DA2 are represented by red, green and blue (RGB) systems, for example, the first sub-display area, the second sub-display area and the third sub-display area in the second display area DA2 respectively display red (R), green (G) and blue (B), under the same gray level binding point, the calibration method of the present invention adjusts the DC compensation values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) in the second display area DA2, so that the optical measurement values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) in the second display area DA2 can be consistent with the first optical measurement value of the first display area DA 1. Then, the calibration method of the present invention can respectively obtain the DC compensation value (e.g. DC _ R in fig. 6) of the first sub-display region (R), the DC compensation value (e.g. DC _ G in fig. 6) of the second sub-display region (G) and the DC compensation value (e.g. DC _ B in fig. 6) of the third sub-display region (B), and can obtain the DC compensation values of other gray level tie points by linear interpolation, but not limited thereto.
In another embodiment, if the sub-display areas in the second display area DA2 are represented by red, green, blue and white (RGBW) system, under the same gray level tie point, the calibration method of the present invention can simultaneously illuminate the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) with different proportions in the second display area DA2 to become the fourth sub-display area (W), so that the first sub-display area, the second sub-display area, the third sub-display area and the fourth sub-display area in the second display area DA2 respectively display red (R), green (G), blue (B) and white (W).
Then, the calibration method of the present invention adjusts the DC compensation values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) in the second display area DA2, so that the optical measurement values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) tend to be consistent with the first optical measurement value of the first display area DA 1. Then, the calibration method of the present invention can obtain the DC compensation value (e.g. DC _ W _ R in fig. 6) of the fourth sub-display area (W) relative to the first sub-display area (R), the DC compensation value (e.g. DC _ W _ G in fig. 6) of the fourth sub-display area (W) relative to the second sub-display area (G), the DC compensation value (e.g. DC _ W _ B in fig. 6) of the fourth sub-display area (W) relative to the third sub-display area (B), the DC compensation value (e.g. DC _ R in fig. 6) of the first sub-display area (R), the DC compensation value (e.g. DC _ G in fig. 6) of the second sub-display area (G) and the DC compensation value (e.g. DC _ B in fig. 6) of the third sub-display area (B), respectively.
In addition, the correction method of the present invention may also obtain the DC compensation value of other gray level ties in the second display area DA2 by linear interpolation, but not limited thereto.
It is assumed that the luminance square program of the second display area DA2 is Y ═ Yr+Yg+YbThen the red luminance Ratio coefficient Ratio _ r is (xR)r)/(xRr+yGr+zBr) And the green luminance Ratio coefficient Ratio _ g ═ y (yG)r)/(xRr+yGr+zBr) And the blue luminance Ratio coefficient Ratio _ b ═ b (zB)r)/(xRr+yGr+zBr) Wherein R, G, B is the current gray level, and x, y, and z are the scaling coefficients corresponding to R, G, B, respectively, but not limited thereto.
For example, the correction method of the present invention may obtain the DC compensation values of other gray scale tie points having different red luminance Ratio coefficients in the second display area DA2 by linear interpolation according to the corresponding relationship between the red luminance Ratio coefficient Ratio _ r and the DC offset shown in fig. 7, but not limited thereto. The same goes for green and blue, and so on, which will not be described herein.
Another embodiment of the present invention is a calibration apparatus for a display panel. In this embodiment, the display panel may be an Organic Light Emitting Diode (OLED) display panel, but is not limited thereto.
Referring to fig. 8, fig. 8 is a schematic diagram illustrating a calibration device applied to a display panel in this embodiment. As shown in fig. 8, the calibration apparatus 1 is coupled to the display panel PL. The display panel PL includes a first display area DA1 and a second display area DA 2. Calibration apparatus 1 includes a display unevenness removal (Demura) module 10, an optical measurement module 12, an AC calibration module 14, and a DC calibration module 16. Demura module 10 is coupled to optical measurement module 12. The optical measurement module 12 is coupled to an AC calibration module 14. The AC calibration module 14 is coupled to the DC calibration module 16.
The Demura module 10 is configured to remove display unevenness (Demura) from the first display area DA1 and the second display area DA2 of the display panel PL. The optical measurement module 12 is used for optically measuring the first display area DA1 and the second display area DA2 of the display panel PL to obtain a first optical measurement value of the first display area DA1 and a second optical measurement value of the second display area DA 2.
The AC calibration module 14 is configured to AC calibrate the first display area DA1 and the second display area DA2 of the display panel PL to eliminate an AC error between the first optical measurement value of the first display area DA1 and the second optical measurement value of the second display area DA 2.
The DC calibration module 16 is used for performing DC calibration on the second display area DA2 of the display panel PL to eliminate a DC error between the second optical measurement value of the second display area DA2 and the first optical measurement value of the first display area DA1, so that the calibrated second optical measurement value of the second display area DA2 can be consistent with the first optical measurement value of the first display area DA 1.
In one embodiment, referring to fig. 9, the DC calibration module 16 may include a definition unit 160, a statistic unit 162, a generation unit 164, a compensation unit 166, a synthesis unit 168, a first gain table GT1, a second gain table GT2, and a third gain table GT 3. The definition unit 160 is coupled to the statistic unit 162. The statistic unit 162 is coupled to the generating unit 164. The generating unit 164 is coupled to the compensating unit 166. The compensation unit 166 is coupled to the synthesis unit 168, the first gain table GT1, the second gain table GT2 and the third gain table GT 3. The synthesizing unit 168 is coupled to the compensating unit 166 and the input terminal of the counting unit 162. The first gain table GT1 is coupled to the compensation unit 166 and the second gain table GT 2. The second gain table GT2 is coupled to the compensation unit 166, the first gain table GT1 and the third gain table GT 3. The third gain table GT3 is coupled to the compensation unit 166 and the second gain table GT 2.
In one embodiment, the defining unit 160 is used for defining the positions of a plurality of sub-display areas in the second display area DA 2. The statistic unit 162 is used for receiving the input data DAT and counting a plurality of optical measurement values of the sub-display areas in the second display area DA2 to obtain current statistic data. The generating unit 164 is configured to obtain a difference between the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 and the first optical measurement value of the first display area DA1 according to the current statistical data, and accordingly generate a plurality of DC compensation values corresponding to the plurality of sub-display areas in the second display area DA 2.
The compensation unit 166 is configured to perform DC compensation on the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 according to the plurality of DC compensation values and the first to third gain tables GT1 to GT3, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 all tend to be consistent with the first optical measurement value of the first display area DA1, and the fineness of the DC compensation performed by the compensation unit 166 may be less than a gray scale. The synthesis unit 168 is used for receiving the input data DAT and the compensated data DAT 'respectively, synthesizing the input data DAT and the compensated data DAT', and outputting the synthesized data.
In practical applications, the sub-display regions in the second display region DA2 can be represented by a red-green-blue (RGB) system, a red-green-blue-white (RGBW) system, an Amber-green-blue (Amber GB) system, or a Yellow-Cyan-Magenta (Yellow Cyan) system, but not limited thereto. The first to third gain tables GT1 to GT3 may represent frequency (Hz) gain tables, Gary gain tables, and DVB gain tables, respectively, but not limited thereto.
In one embodiment, if the sub-display areas in the second display area DA2 are represented by red, green and blue (RGB) systems, for example, the first, second and third sub-display areas in the second display area DA2 respectively display red (R), green (G) and blue (B), then under the same gray level binding point, the DC calibration module 16 adjusts the DC compensation values of the first, second and third sub-display areas (R), G and B) in the second display area DA2, so that the optical measurement values of the first, second and third sub-display areas (R, G and B) in the second display area DA2 can be consistent with the first optical measurement value of the first display area DA1, so as to obtain the DC compensation value of the first sub-display area (R) (for example, DC _ R in fig. 6, DC _ R) and DC _ R in the first sub-display area DA2, The DC compensation value (e.g. DC _ G in fig. 6) of the second sub-display area (G) and the DC compensation value (e.g. DC _ B in fig. 6) of the third sub-display area (B) can be obtained by linear interpolation, but not limited thereto.
In another embodiment, if the sub-display regions in the second display region DA2 are represented by red, green, blue and white (RGBW) system, the DC calibration module 16 can simultaneously illuminate the first sub-display region (R), the second sub-display region (G) and the third sub-display region (B) with different proportions in the second display region DA2 to become the fourth sub-display region (W) under the same gray scale binding, so that the first sub-display region, the second sub-display region, the third sub-display region and the fourth sub-display region respectively display red (R), green (G), blue (B) and white (W). And adjusting the DC compensation values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) to make the optical measurement values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) tend to be consistent with the first optical measurement value of the first display area DA 1. Then, the DC calibration module 16 may obtain a DC compensation value (e.g., DC _ W _ R in fig. 6) of the fourth sub-display area (W) relative to the first sub-display area (R), a DC compensation value (e.g., DC _ W _ G in fig. 6) of the fourth sub-display area (W) relative to the second sub-display area (G), a DC compensation value (e.g., DC _ W _ B in fig. 6) of the fourth sub-display area (W) relative to the third sub-display area (B), a DC compensation value (e.g., DC _ R in fig. 6) of the first sub-display area (R), a DC compensation value (e.g., DC _ G in fig. 6) of the second sub-display area (G), and a DC compensation value (e.g., DC _ B in fig. 6) of the third sub-display area (B), respectively. In addition, the DC calibration module 16 can also obtain DC compensation values of other gray level ties by linear interpolation, but not limited thereto.
Compared with the prior art, the calibration method and the calibration apparatus applied to the display panel according to the present invention perform AC calibration on the first display area (e.g., the main screen) and the second display area (e.g., the sub-screen) of the display panel after removing the display mura (Demura) and obtaining the respective optical measurement values (e.g., the luminance/color coordinates) of the first display area (e.g., the main screen) and the second display area (e.g., the sub-screen) of the display panel, and then perform DC calibration on the second display area (e.g., the sub-screen) by, for example, multi-region compensation (MRC), so that the optical measurement values (e.g., the luminance/color coordinates) of the second display area (e.g., the sub-screen) can be consistent with the optical measurement values (e.g., the luminance/color coordinates) of the first display area (e.g., the main screen) by the DC error between the first display area and the second display area (e.g., the sub-screen).

Claims (20)

1. A calibration method applied to a display panel, the display panel including a first display area and a second display area, the calibration method comprising the steps of:
(a) removing display unevenness of the first display area and the second display area;
(b) performing optical measurement on the first display area and the second display area to obtain a first optical measurement value of the first display area and a second optical measurement value of the second display area;
(c) Performing AC calibration on the first display area and the second display area to eliminate an AC error between the first optical measurement value of the first display area and the second optical measurement value of the second display area; and
(d) and performing DC calibration on the second display area to eliminate a DC error between the second optical measurement value of the second display area and the first optical measurement value of the first display area, so that the second optical measurement value of the second display area after calibration can be consistent with the first optical measurement value of the first display area.
2. The calibration method as claimed in claim 1, wherein the first display area has a first pixel density and the second display area has a second pixel density, the first pixel density and the second pixel density being equal or different.
3. The method of claim 1, wherein the first optical measurement and the second optical measurement are luminance or color coordinates.
4. The calibration method as claimed in claim 1, wherein the step (d) is performed by performing a multi-domain compensation on the second display region.
5. The calibration method as claimed in claim 4, wherein the multi-domain compensation method comprises the following steps:
(d1) defining the positions of a plurality of sub-display areas in the second display area;
(d2) counting a plurality of optical measurement values of the plurality of sub-display areas to obtain current statistical data;
(d3) generating a plurality of DC offset values corresponding to the plurality of sub-display areas according to the current statistical data; and
(d4) and respectively carrying out DC compensation on the optical measurement values of the sub-display areas in the second display area according to the DC compensation values, so that the optical measurement values of the sub-display areas in the second display area and the first optical measurement value of the first display area tend to be consistent.
6. The calibration method as claimed in claim 5, wherein the step (d3) comprises obtaining the difference between the optical measurements of the sub-display areas in the second display area and the first optical measurement of the first display area according to the current statistics, and obtaining the DC offset values accordingly.
7. The calibration method as claimed in claim 5, wherein the DC offset is finer than a gray level.
8. The calibration method as claimed in claim 5, wherein the sub-display regions of the second display region are represented by RGB system, RGB-white system, amber-green-blue system or yellow-cyan-magenta system.
9. The calibration method as claimed in claim 5, further comprising the steps of:
under the same gray scale binding point, adjusting DC compensation values of a first sub-display area, a second sub-display area and a third sub-display area in the second display area so that optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area in the second display area can be consistent with the first optical measurement value of the first display area;
obtaining the DC compensation value of the first sub-display area, the DC compensation value of the second sub-display area and the DC compensation value of the third sub-display area; and
and obtaining the DC compensation values of other gray scale binding points in a linear interpolation mode.
10. The calibration method as claimed in claim 5, further comprising the steps of:
Under the same gray scale binding point, simultaneously lightening a first sub-display area, a second sub-display area and a third sub-display area in different proportions in the second display area to form a fourth sub-display area, and adjusting DC compensation values of the first sub-display area, the second sub-display area and the third sub-display area so that optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area tend to be consistent with the first optical measurement value of the first display area;
acquiring a DC compensation value of the fourth sub-display area relative to the first sub-display area, a DC compensation value of the fourth sub-display area relative to the second sub-display area, a DC compensation value of the fourth sub-display area relative to the third sub-display area, a DC compensation value of the first sub-display area, a DC compensation value of the second sub-display area and a DC compensation value of the third sub-display area; and
and obtaining the DC compensation value of other gray scale binding points in a linear interpolation mode.
11. A calibration device applied to a display panel, the display panel including a first display area and a second display area, the calibration device comprising:
The display unevenness removing module is used for removing display unevenness of the first display area and the second display area;
an optical measurement module for performing optical measurement on the first display area and the second display area to obtain a first optical measurement value of the first display area and a second optical measurement value of the second display area;
an AC calibration module for AC calibrating the first display area and the second display area to eliminate an AC error between the first optical measurement value of the first display area and the second optical measurement value of the second display area; and
a DC calibration module for DC calibrating the second display region to eliminate DC error between the second optical measurement value of the second display region and the first optical measurement value of the first display region, so that the calibrated second optical measurement value of the second display region can be consistent with the first optical measurement value of the first display region.
12. The apparatus of claim 11, wherein the first display area has a first pixel density and the second display area has a second pixel density, the first pixel density being equal to or different from the second pixel density.
13. The apparatus of claim 11, wherein the first optical measurement and the second optical measurement are luminance or color coordinates.
14. The apparatus of claim 11, wherein the DC calibration module performs DC calibration on the second display area by multi-domain compensation.
15. The apparatus of claim 14, wherein the DC calibration module comprises:
a defining unit for defining the positions of the sub-display areas in the second display area;
a statistic unit for counting a plurality of optical measurement values of the plurality of sub-display areas to obtain current statistic data;
a generating unit for generating a plurality of DC offset values corresponding to the plurality of sub-display areas according to the current statistical data; and
a compensation unit, for performing DC compensation on the plurality of optical measurement values of the plurality of sub-display areas in the second display area according to the plurality of DC compensation values, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area all tend to be consistent with the first optical measurement value of the first display area.
16. The apparatus of claim 15, wherein the generating unit obtains the difference between the optical measurements of the sub-display regions in the second display region and the first optical measurement of the first display region according to the current statistics, and obtains the DC offset values accordingly.
17. The apparatus of claim 15, wherein the DC compensation of the compensation unit is performed with a fineness less than a gray level.
18. The apparatus of claim 15, wherein the sub-display regions in the second display region are represented by RGB, RGB-B, amber-green-blue, or yellow-cyan-magenta.
19. The apparatus of claim 15, wherein under a same gray level tie point, the DC calibration module further adjusts DC compensation values of a first sub-display area, a second sub-display area and a third sub-display area in the second display area, such that optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area in the second display area can be consistent with the first optical measurement value of the first display area, so as to obtain the DC compensation value of the first sub-display area, the DC compensation value of the second sub-display area and the DC compensation value of the third sub-display area, and obtain DC compensation values of other gray level tie points by linear interpolation.
20. The apparatus of claim 15, wherein under the same gray level binding point, the DC calibration module further simultaneously lights up first, second and third sub-display regions of different ratios in the second display region to form a fourth sub-display region, and adjusts DC compensation values of the first, second and third sub-display regions such that optical measurement values of the first, second and third sub-display regions tend to be consistent with the first optical measurement value of the first display region, and obtains a DC compensation value of the fourth sub-display region relative to the first sub-display region, a DC compensation value of the fourth sub-display region relative to the second sub-display region, a DC compensation value of the fourth sub-display region relative to the third sub-display region, The DC compensation value of the first sub-display area, the DC compensation value of the second sub-display area and the DC compensation value of the third sub-display area, and the DC compensation values of other gray scale binding points are obtained in a linear interpolation mode.
CN202110006398.XA 2020-11-13 2021-01-05 Calibration method and calibration device applied to display panel Active CN114495817B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW109139751A TWI758950B (en) 2020-11-13 2020-11-13 Calibration method and calibration apparatus applied to display panel
TW109139751 2020-11-13

Publications (2)

Publication Number Publication Date
CN114495817A true CN114495817A (en) 2022-05-13
CN114495817B CN114495817B (en) 2024-07-30

Family

ID=81491634

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110006398.XA Active CN114495817B (en) 2020-11-13 2021-01-05 Calibration method and calibration device applied to display panel

Country Status (2)

Country Link
CN (1) CN114495817B (en)
TW (1) TWI758950B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859936A (en) * 1987-01-29 1989-08-22 John Fluke Mfg. Co., Inc. Method of and apparatus for determining AC calibration errors and apparatus using device with AC calibration errors
US5899596A (en) * 1998-05-29 1999-05-04 Hewlett-Packard Company Optimization of electrophotographic edge development
CN104795048A (en) * 2015-04-14 2015-07-22 广东威创视讯科技股份有限公司 Color calibration method and system for tiled displays
US20150213652A1 (en) * 2012-01-27 2015-07-30 Koninklijke Philips N.V. Automated detection of area at risk using quantitative t1 mapping
US20180088185A1 (en) * 2016-09-26 2018-03-29 Magic Leap, Inc. Calibration of magnetic and optical sensors in a virtual reality or augmented reality display system
KR20180062332A (en) * 2016-11-30 2018-06-08 엘지디스플레이 주식회사 Liquid crystal display apparatus and method for driving the same
CN109036277A (en) * 2018-09-27 2018-12-18 京东方科技集团股份有限公司 Compensation method and compensation device, display device, display methods and storage medium
CN109710209A (en) * 2018-12-25 2019-05-03 努比亚技术有限公司 A kind of split screen comparison method, equipment and computer readable storage medium
US20190228737A1 (en) * 2018-01-23 2019-07-25 Benq Corporation Screen Calibration Method and Screen Calibration System Capable of Correcting Full Screen Color Tones Automatically
CN111796783A (en) * 2020-06-12 2020-10-20 北京小米移动软件有限公司 Display screen color calibration method, device and medium

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102090706B1 (en) * 2012-12-28 2020-03-19 삼성디스플레이 주식회사 Display device, Optical compensation system and Optical compensation method thereof
US10431142B2 (en) * 2016-11-14 2019-10-01 Int Tech Co., Ltd. Pixel circuit and electroluminescent display comprising the pixel circuit
CN106782303B (en) * 2016-12-28 2018-12-25 上海天马有机发光显示技术有限公司 A kind of display bearing calibration of display panel, apparatus and system
US11025899B2 (en) * 2017-08-11 2021-06-01 Ignis Innovation Inc. Optical correction systems and methods for correcting non-uniformity of emissive display devices
US10580385B2 (en) * 2018-06-11 2020-03-03 Hung-Cheng Kuo Method for enhancing luminance uniformity of a display panel

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859936A (en) * 1987-01-29 1989-08-22 John Fluke Mfg. Co., Inc. Method of and apparatus for determining AC calibration errors and apparatus using device with AC calibration errors
US5899596A (en) * 1998-05-29 1999-05-04 Hewlett-Packard Company Optimization of electrophotographic edge development
US20150213652A1 (en) * 2012-01-27 2015-07-30 Koninklijke Philips N.V. Automated detection of area at risk using quantitative t1 mapping
CN104795048A (en) * 2015-04-14 2015-07-22 广东威创视讯科技股份有限公司 Color calibration method and system for tiled displays
US20180088185A1 (en) * 2016-09-26 2018-03-29 Magic Leap, Inc. Calibration of magnetic and optical sensors in a virtual reality or augmented reality display system
KR20180062332A (en) * 2016-11-30 2018-06-08 엘지디스플레이 주식회사 Liquid crystal display apparatus and method for driving the same
US20190228737A1 (en) * 2018-01-23 2019-07-25 Benq Corporation Screen Calibration Method and Screen Calibration System Capable of Correcting Full Screen Color Tones Automatically
CN109036277A (en) * 2018-09-27 2018-12-18 京东方科技集团股份有限公司 Compensation method and compensation device, display device, display methods and storage medium
CN109710209A (en) * 2018-12-25 2019-05-03 努比亚技术有限公司 A kind of split screen comparison method, equipment and computer readable storage medium
CN111796783A (en) * 2020-06-12 2020-10-20 北京小米移动软件有限公司 Display screen color calibration method, device and medium

Also Published As

Publication number Publication date
CN114495817B (en) 2024-07-30
TW202219939A (en) 2022-05-16
TWI758950B (en) 2022-03-21

Similar Documents

Publication Publication Date Title
US20230074524A1 (en) Method and device for obtaining display compensation information, and display compensation method and device
US8442316B2 (en) System and method for improving color and brightness uniformity of backlit LCD displays
CN102376294B (en) Multi-display system
JP5922160B2 (en) Display calibration system, program, recording medium
US6677958B2 (en) Method for calibrating, characterizing and driving a color flat panel display
US20080309766A1 (en) Color calibrating method for setting target gamma curves of target display device
CN110223650B (en) White balance parameter generation method for four-color pixel and display device
US20060114274A1 (en) System for reducing crosstalk
KR20150081085A (en) Method of compensating image of display panel, method of driving display panel including the same and display apparatus for performing the same
CN103765503A (en) Fast calibration of displays using spectral-based colorimetrically calibrated multicolor camera
KR20070063407A (en) Method and apparatus for calibrating a color display panel and related manufacturing and service method
US20090273551A1 (en) Gamma Correction Apparatus and a Method of the Same
CN102479482B (en) Image display device and method of driving the same
CN102667914A (en) Multiple-primary-color display device
CN115841794B (en) OLED display screen detection method and device, display image processing method and device
US10580384B1 (en) Panel calibration using multiple non-linear models
CN208706220U (en) A kind of colour gamut calibrating installation and colour gamut calibration system
CN112289250B (en) Compensation method and device of display module
CN110728953B (en) Gray scale voltage correction method, driving method, correction system and storage medium
CN114495817B (en) Calibration method and calibration device applied to display panel
US8194015B1 (en) Reduction of the effect of AVDD power supply variation on gamma reference voltages and the ability to compensate for manufacturing variations
US20100309218A1 (en) Method for color calibration and device using the same
EP2161916A1 (en) Color-rendering index device
CN112885300B (en) Panel calibration using multiple nonlinear models
US10964240B1 (en) Accurate display panel calibration with common color space circuitry

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant