TWI758950B - Calibration method and calibration apparatus applied to display panel - Google Patents

Abstract

A calibration method applied to a display panel is disclosed. The calibration method includes steps of: (a) performing demura on 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 measuring value of the first display area and a second optical measuring value of the second display area; (c) performing AC calibration on the first display area and the second display area to reduce AC error between the first optical measuring value and the second optical measuring value; and (d) performing DC calibration on the second display area to reduce DC error between the second optical measuring value and the first optical measuring value, so that the calibrated second optical measuring value can converge with the first optical measuring value.

Description

Calibration method and calibration device applied to display panel

The present invention relates to a display panel, in particular to a calibration method and a calibration device applied to the display panel.

Generally speaking, in the application of under-screen camera, the organic light emitting diode (OLED) display panel usually includes different display areas, such as the main screen with high pixel density (PPI) and the secondary screen with low pixel density (PPI) Screen. Since the secondary screen needs to ensure a certain light transmittance, it will be significantly different from the main screen in circuit design, graphic element distribution, and material selection. Therefore, how to make the brightness and color coordinates of the secondary screen consistent with the main screen is the current one of the technical difficulties.

At present, the commonly used solution is to adjust the gamma value of the main screen and the secondary screen first, and then adjust the red (R)/green (G)/ The luminance ratio coefficient of blue (B) enables the luminance/color coordinates of the monolithic organic light emitting diode (OLED) display panel to meet the specification requirements.

However, in actual mass production, due to factors such as Gamma adjustment accuracy, photographic exposure accuracy, etc., it is easy to cause differences between different OLED display panels produced with the same set of parameters. The large difference will affect the overall mass production yield, and even lead to the failure of mass production, so it needs to be further overcome.

In view of this, the present invention proposes a calibration method and a calibration device applied to a display panel to effectively solve the above-mentioned problems encountered in the prior art.

One specific embodiment of the present invention is a calibration method applied to a display panel. In this embodiment, the display panel includes a first display area and a second display area. The calibration method includes the following steps: (a) removing display unevenness (Demura) on 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 the first display area and the second display area. The first optical measurement value of a display area and the second optical measurement value of the second display area; (c) Alternating Current (AC) calibration is performed on the first display area and the second display area to eliminate the first AC error between the first optical measurement value of the display area and the second optical measurement value of the second display area; and (d) performing a direct current (DC) calibration on the second display area to eliminate the second The DC error between the second optical measurement value of the display area and the first optical measurement value of the first display area causes the calibrated second optical measurement value of the second display area to be consistent with the first optical measurement value of the first display area. An optical measurement tends to be consistent.

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 value and the second optical measurement value are luminance or color coordinates.

In one embodiment, the step (d) is to perform DC calibration on the second display region by using a Multi-Region Compensation (MRC) method.

In one embodiment, the multi-area compensation method includes 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 the current Statistical data; (d3) generate a pair based on the current statistical data A plurality of DC compensation values corresponding to the plurality of sub-display areas; and (d4) 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, respectively, As a result, the plurality of optical measurement values of the plurality of sub-display areas in the second display area tend to be consistent with the first optical measurement values of the first display area.

In one embodiment, step (d3) includes obtaining 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. The difference between the measured values is measured, and the plurality of DC compensation values are obtained accordingly.

In one embodiment, the fineness of the DC compensation may be less than one gray scale.

In one embodiment, the plurality of sub-display areas in the second display area DA2 use 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 includes the following steps: adjusting the DC compensation values of the first sub-display area, the second sub-display area and the third sub-display area in the second display area under the same gray-scale binding point , so that the 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 tend to be consistent with the first optical measurement value of the first display area; obtain the first The DC compensation value of the 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 through linear interpolation.

In one embodiment, the calibration method further includes the step of: simultaneously lighting the first sub-display area, the second sub-display area and the third sub-display area in different proportions in the second display area under the same gray-scale binding point area to become the fourth sub-display area, and adjust the first sub-display area, The DC compensation values of the second sub-display area and the third sub-display area cause the optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area to be the same as the first optical measurement value of the first sub-display area. The values tend to be consistent; obtain 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, and the fourth sub-display area relative to the third sub-display area. The DC compensation value of the display area, 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 of other gray-scale binding points obtained through linear interpolation compensation value.

Another embodiment according to the present invention is a calibration device applied to a display panel. In this embodiment, the display panel includes a first display area and a second display area. The calibration device includes a display unevenness removal (Demura) module, an optical measurement module, an alternating current (AC) calibration module and a direct current (DC) calibration module. The display unevenness removal module is used for removing display unevenness (demura) on 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 the first optical measurement value of the first display area and the second optical measurement value of the second display area. The AC calibration module is used to perform AC calibration on the first display area and the second display area, so as to eliminate the AC error 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 to perform DC calibration on the second display area to eliminate the DC error between the second optical measurement value of the second display area and the first optical measurement value of the first display area, resulting in the second display area The calibrated second optical measurement value of the area can be consistent with the first optical measurement value of the first display area.

Compared with the prior art, the calibration method and calibration device applied to a display panel according to the present invention complete the removal of display unevenness (Demura) on the first display area (eg, the main screen) and the second display area (eg, the secondary screen) of the display panel. ) and obtain their respective optical measurements (e.g. brightness/color Coordinates), first perform AC calibration on the first display area (such as the main screen) and the second display area (such as the secondary screen), and then perform AC calibration on the second display area (such as The secondary screen) is DC calibrated, so that the DC error between the two can make the optical measurement values (such as brightness/color coordinates) of the second display area (such as the secondary screen) match the optical measurement values of the first display area (such as the main screen) Measured values (eg luminance/color coordinates) tend to be consistent.

The advantages and spirit of the present invention can be further understood from the following detailed description of the invention and the accompanying drawings.

PL: Display Panel

DA1: The first display area

DA2: Second display area

DIF:DC Error

R: red

G: Green

B: blue

1: Calibration device

10: Remove the uneven display (Demura) module

12: Optical measurement module

14: AC calibration module

16: DC calibration module

S10~S16: Steps

S20~S26: Steps

DAT: input data

DAT’: Post-compensation data

160: Define Unit

162: Statistics Unit

164:Generate unit

166: Compensation unit

168: Synthesis Unit

GT1: First Gain Table

GT2: Second Gain Table

GT3: Third Gain Table

DC_R, DC_G, DC_B, DC_W_R, DC_W_G, DC_W_B: DC compensation value

The accompanying drawings of the present invention are described as follows: FIG. 1 is a schematic diagram of a display panel including a first display area and a second display area.

2A and 2B are schematic diagrams illustrating AC calibration and DC calibration performed on the first display area and the second display area of the display panel.

FIG. 3 is a schematic diagram of performing DC offset (Offset) on the red (R)/green (G)/blue (B) compensation values of the secondary screen of the display panel by means of a point-bonding method.

FIG. 4 is a flowchart illustrating a calibration method applied to a display panel according to a preferred embodiment of the present invention.

FIG. 5 is a flowchart of a DC calibration method.

FIG. 6 shows that DC offset is performed for the white (W) picture and the red (R)/green (G)/blue (B) picture under the same grayscale binding point to adjust the main screen and the sub screen to be consistent to obtain DC Schematic diagram of compensation values.

FIG. 7 shows the correspondence between the luminance ratio coefficient of red and the DC offset.

FIG. 8 illustrates calibration applied to a display panel according to another preferred embodiment of the present invention. Schematic diagram of the quasi-device.

FIG. 9 is a schematic diagram of a DC calibration module.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Elements/components using the same or similar numbers in the drawings and the embodiments are intended to represent the same or similar parts.

One specific embodiment of the present 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 not limited thereto. The display panel includes a plurality of display areas, and the positions and shapes of the plurality of display areas are not particularly limited. For example, the display panel PL in FIG. 1 includes a first display area DA1 and a second display area DA2, but this is not the case. limit.

The first display area DA1 and the second display area DA2 respectively include a plurality of 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 respectively represent the main screen with high pixel density and the secondary screen with low pixel density, but not limited thereto.

In this embodiment, the calibration method of the present invention can firstly remove the display unevenness (Demura) on the first display area DA1 and the second display area DA2 of the display panel PL, and then perform the first display area DA1 and the second display area on the first display area DA1 and the second display area. The area DA2 is optically measured to obtain the first optical measurement value of the first display area DA1 and the second optical measurement value of the second display area DA2. Actually, the first optical measurement value and the second optical measurement value may be brightness or color coordinates, but not limited thereto.

Next, the calibration method of the present invention can perform AC calibration on the first display area DA1 and the second display area DA2 to eliminate the first optical measurement value of the first display area DA1 and the second optical measurement value of the second display area DA2 AC error between values, as shown in Figure 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, the There is still a DC error DIF between the first optical measurement value and the second optical measurement value of the second display area DA2.

Therefore, as shown in FIG. 2B, the calibration method of the present invention can further perform DC calibration on the second display area DA2, so as to eliminate the second optical measurement value of the second display area DA2 and the first optical measurement value of the first display area DA1 The DC error DIF between the measured values makes the second optical measurement value of the second display area DA2 tend to be consistent with the first optical measurement value of the first display area DA1 after DC calibration. In this way, the optical measurement value (such as brightness or color coordinates) of the second display area DA2 (secondary screen) can be consistent with the optical measurement value of the first display area DA1 (main screen), which can effectively overcome the problems encountered in the prior art. to the problem.

In practical applications, the calibration method of the present invention may adopt a multi-region compensation (Multi-Region Compensation, MRC) method to perform DC calibration on the second display area DA2, but is not limited thereto.

In one embodiment, please refer to FIG. 4 , the multi-area compensation method used in the calibration method of the present invention may include the following steps: Step S10 : define the positions of a plurality of sub-display areas in the second display area DA2 ; Step S12 : count The plurality of optical measurement values of the plurality of sub-display areas are Obtain the current statistical data; Step S14: generate a plurality of DC compensation values corresponding to the plurality of sub-display areas according to the current statistical data; and Step S16: according to the plurality of DC compensation values, respectively, to the plurality of sub-display areas in the second display area DA2. DC compensation is performed on the plurality of optical measurement values of the display area, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 are all close to the first optical measurement values of the first display area DA1. in agreement.

In practical applications, the precision of the DC compensation performed in step S16 may be less than one gray scale, but not limited thereto.

In another embodiment, step S14 can obtain the 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 obtain the plurality of DC compensation values, but not limited thereto.

In detail, please refer to FIG. 5 , the multi-area compensation method adopted by the calibration method of the present invention may further include the following steps: Step S20 : removing display unevenness (Demura) on the first display area DA1 and the second display area DA2 After calibrating with AC, there will still be a DC error between the optical measurement values of the first display area DA1 and the second display area DA2; Step S22: Change the input grayscale to measure the complex number corresponding to the second display area DA2 A plurality of DC compensation values of the sub-display regions; Step S24: respectively calculating compensation parameters for different colors (eg, red (R), green (G), and blue (B)) that are compensated in multiple regions; and Step S26: Statistically obtain components of different colors (eg, red (R), green (G), and blue (B)) and reset the DC offset output value accordingly to match the measurement data.

In practical applications, the plurality of sub-display areas in the second display area DA2 can use, 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 to represent, but not limited to.

In one embodiment, if the plurality of sub-display areas in the second display area DA2 are represented by a red-green-blue (RGB) system, for example, the first sub-display area and the second sub-display area in the second display area DA2 and the third sub-display area respectively display red (R), green (G) and blue (B), then under the same gray-scale binding point, the calibration method of the present invention will adjust the first sub-display area in the second display area DA2 The DC compensation value of the display area (R), the second sub-display area (G) and the third sub-display area (B), so that the first sub-display area (R) and the second sub-display area in the second display area DA2 The optical measurement values of (G) and the third sub-display area (B) can be consistent with the first optical measurement value of the first display area DA1. Then, the calibration method of the present invention can obtain the DC compensation value of the first sub-display area (R) (eg, DC_R in FIG. 6 ) and the DC compensation value of the second sub-display area (G) (eg, DC_G in FIG. 6 ), respectively. ) and the DC compensation value of the third sub-display area (B) (eg, DC_B in FIG. 6 ), and the DC compensation value of other gray-scale binding points can be obtained through linear interpolation, but not limited thereto.

In another embodiment, if the plurality of sub-display areas in the second display area DA2 are represented by a red-green-blue-white (RGBW) system, then under the same gray-scale binding point, the calibration method of the present invention can simultaneously Light up the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) in 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 display red (R), green (G), blue (B) and white (W) respectively. ).

Next, 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 first sub-display area (G) The optical measurement values of the 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 DA1. Then, the calibration method of the present invention can obtain the DC compensation value of the fourth sub-display area (W) relative to the first sub-display area (R) (for example, DC_W_R in FIG. 6 ), and the relative value of the fourth sub-display area (W) The DC compensation value of the second sub-display area (G) (such as DC_W_G in FIG. 6 ), the DC compensation value of the fourth sub-display area (W) relative to the third sub-display area (B) (such as the DC_W_G in FIG. 6 ) DC_W_B), the DC compensation value of the first sub-display area (R) (eg, DC_R in FIG. 6 ), the DC compensation value of the second sub-display area (G) (eg, DC_G in FIG. 6 ), and the third sub-display area (B) DC compensation value (eg DC_B in Figure 6).

In addition, the calibration method of the present invention can also obtain the DC compensation values of other gray-scale binding points in the second display area DA2 through linear interpolation, but is not limited thereto.

Assuming that the luminance equation of the second display area DA2 is Y=Y _r +Y _g +Y _b , the red luminance ratio coefficient Ratio_r=(xR ^r )/(xR ^r +yG ^r +zB ^r ), the green luminance ratio coefficient Ratio_g= (yG ^r )/(xR ^r +yG ^r +zB ^r ), blue luminance ratio coefficient Ratio_b=(zB ^r )/(xR ^r +yG ^r +zB ^r ), where R, G, and B are the current grayscale value, x, y, and z are proportional coefficients corresponding to R, G, and B, respectively, but not limited to this.

For example, the calibration method of the present invention can obtain other coefficients with different red luminance ratio coefficients in the second display area DA2 according to the corresponding relationship between the red luminance ratio coefficient Ratio_r and the DC offset shown in FIG. 7 through linear interpolation The DC compensation value of the grayscale binding point, but not limited to this. As for green and blue, it can be deduced in the same way, which will not be repeated here.

Another specific embodiment according to the present invention is a calibration method applied to a display panel. standard device. In this embodiment, the display panel may be an organic light emitting diode (OLED) display panel, but not limited thereto.

Please refer to FIG. 8 . FIG. 8 is a schematic diagram of the calibration device applied to the display panel in this embodiment. As shown in FIG. 8 , the calibration device 1 is coupled to the display panel PL. The display panel PL includes a first display area DA1 and a second display area DA2. The calibration device 1 includes a demura removal module 10 , an optical measurement module 12 , an AC calibration module 14 and a DC calibration module 16 . The Demura module 10 is coupled to the optical measurement module 12 . The optical measurement module 12 is coupled to the AC calibration module 14 . The AC calibration module 14 is coupled to the DC calibration module 16 .

The Demura module 10 is used to remove display unevenness (Demura) on the first display area DA1 and the second display area DA2 of the display panel PL. The optical measurement module 12 is used to perform optical measurement on the first display area DA1 and the second display area DA2 of the display panel PL, so as to obtain the first optical measurement value of the first display area DA1 and the second display area DA2. The second optical measurement value.

The AC calibration module 14 is used to perform AC calibration on the first display area DA1 and the second display area DA2 of the display panel PL, so as to eliminate the first optical measurement value of the first display area DA1 and the second display area DA2 AC error between optical measurements.

The DC calibration module 16 is used for performing DC calibration on the second display area DA2 of the display panel PL to eliminate the difference between the second optical measurement value of the second display area DA2 and the first optical measurement value of the first display area DA1 Therefore, the calibrated second optical measurement value of the second display area DA2 and the first optical measurement value of the first display area DA1 tend to be consistent.

In one embodiment, please refer to FIG. 9 , the DC calibration module 16 may include a definition unit 160 , a statistics unit 162 , a generation unit 164 , a compensation unit 166 , a synthesis unit 168 , and a first gain The table GT1, the second gain table GT2, and the third gain table GT3. The defining unit 160 is coupled to the statistics unit 162 . The statistics unit 162 is coupled to the generation unit 164 . The generating unit 164 is coupled to the compensation 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 GT3 . The synthesis unit 168 is coupled to the input ends of the compensation unit 166 and the statistics unit 162 . The first gain table GT1 is coupled to the compensation unit 166 and the second gain table GT2. The second gain table GT2 is coupled to the compensation unit 166 , the first gain table GT1 and the third gain table GT3 . The third gain table GT3 is coupled to the compensation unit 166 and the second gain table GT2.

In one embodiment, the defining unit 160 is used to define the positions of the plurality of sub-display areas in the second display area DA2. The statistics unit 162 is used for receiving the input data DAT and counting the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 to obtain current statistical data. The generating unit 164 is configured to obtain the 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, a plurality of DC compensation values corresponding to the plurality of sub-display areas in the second display area DA2 are generated.

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 gain table GT1 to the third gain table GT3, respectively, As a result, the plurality of optical measurement values of the plurality of sub-display areas in the second display area DA2 tend to be consistent with the first optical measurement values of the first display area DA1, and the precision of the DC compensation performed by the compensation unit 166 can be improved. less than one grayscale. The synthesizing unit 168 is used for respectively receiving the input data DAT and the compensated data DAT' and synthesizing the two for output.

In practical applications, the plurality of sub-display areas in the second display area DA2 It 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 Magenta) system, but not limited thereto. In addition, the first gain table GT1 to the third gain table GT3 may represent the frequency (Hz) gain table, the Gary gain table and the DVB gain table, respectively, but not limited thereto.

In one embodiment, if the plurality of sub-display areas in the second display area DA2 are represented by a red-green-blue (RGB) system, for example, the first sub-display area and the second sub-display area in the second display area DA2 and the third sub-display area respectively display red (R), green (G) and blue (B), then under the same gray-scale binding point, the DC calibration module 16 will adjust the first sub-display in the second display area DA2 The DC compensation value of the display area (R), the second sub-display area (G) and the third sub-display area (B), so that the first sub-display area (R) and the second sub-display area in the second display area DA2 The optical measurement values of (G) and the third sub-display area (B) 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 ), the DC compensation value of the second sub-display area (G) (such as DC_G in FIG. 6 ), and the DC compensation value of the third sub-display area (B) (such as DC_B in FIG. 6 ), The DC compensation values of other gray-scale binding points can be obtained through linear interpolation, but not limited to this.

In another embodiment, if the plurality of sub-display areas in the second display area DA2 are represented by a red-green-blue-white (RGBW) system, then under the same gray-scale binding point, the DC calibration module 16 can simultaneously Light up the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B) in 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 display red (R), green (G), blue (B), and white (W), respectively. Adjust the DC compensation values of the first sub-display area (R), the second sub-display area (G) and the third sub-display area (B), so that the first sub-display area (R), the optical measurement values of the second sub-display area (G) and the third sub-display area (B) tend to be consistent with the first optical measurement values of the first display area DA1. Then, the DC calibration module 16 can obtain the DC compensation value of the fourth sub-display area (W) relative to the first sub-display area (R) (for example, DC_W_R in FIG. 6 ), and the relative value of the fourth sub-display area (W) relative to the first sub-display area (R). The DC compensation value of the second sub-display area (G) (such as DC_W_G in FIG. 6 ), the DC compensation value of the fourth sub-display area (W) relative to the third sub-display area (B) (such as the DC_W_G in FIG. 6 ) DC_W_B), the DC compensation value of the first sub-display area (R) (eg, DC_R in FIG. 6 ), the DC compensation value of the second sub-display area (G) (eg, DC_G in FIG. 6 ), and the third sub-display area (B) DC compensation value (eg DC_B in Figure 6). In addition, the DC calibration module 16 can also obtain the DC compensation values of other gray-scale binding points through linear interpolation, but is not limited thereto.

Compared with the prior art, the calibration method and calibration device applied to a display panel according to the present invention complete the removal of display unevenness (Demura) on the first display area (eg, the main screen) and the second display area (eg, the secondary screen) of the display panel. ) and obtain their respective optical measurement values (such as brightness/color coordinates), first perform AC calibration on the first display area (such as the main screen) and the second display area (such as the secondary screen), and then perform AC calibration through, for example, multi-area compensation ( The DC calibration is performed on the second display area (such as the secondary screen) by MRC), so that the optical measurement value (such as brightness/color coordinates) of the second display area (such as the secondary screen) can be compared with the DC error between the two. The optical measurement values (eg, brightness/color coordinates) of the first display area (eg, the main screen) tend to be consistent.

1: Calibration device

10: Remove the uneven display (Demura) module

12: Optical measurement module

14: AC calibration module

16: DC calibration module

PL: Display Panel

DA1: The first display area

DA2: Second display area

Claims (20)

A calibration method applied to a display panel, the display panel comprising a first display area and a second display area, the calibration method comprising the following steps: (a) removing the first display area and the second display area Display unevenness (Demura); (b) perform 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 value of the second display area the second optical measurement value; (c) performing AC calibration on the first display area and the second display area to eliminate the first optical measurement value and the second display area in the first display area and (d) performing a direct current (DC) calibration on the second display area to eliminate the difference between the second optical measurement of the second display area and the first The DC error between the first optical measurement values of the display area causes the second optical measurement value of the second display area after calibration to be close to the first optical measurement value of the first display area Consistent. The calibration method of 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 are equal or different. The calibration method as described in claim 1, wherein the first optical measurement value and the second optical measurement value are luminance or color coordinates. The calibration method according to claim 1, wherein step (d) is to perform DC calibration on the second display area (secondary screen) by adopting a multi-region compensation (Multi-Region Compensation, MRC) method. The calibration method according to claim 4, wherein the multi-area compensation method comprises the following steps: (d1) defining the positions of a plurality of sub-display areas in the second display area; (d2) counting the plurality of sub-display areas (d3) according to the current statistical data to generate a plurality of DC compensation values corresponding to the plurality of sub-display areas; and (d4) according to the plurality of DC compensation values respectively for the DC compensation is performed on the plurality of optical measurement values of the plurality of sub-display areas in the second display area, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area are the same as the first display area The first optical measurements of the regions tend to be consistent. The calibration method according to claim 5, wherein step (d3) comprises obtaining the plurality of optical measurement values of the plurality of sub-display areas in the second display area and the first display area according to the current statistical data The difference between the first optical measurement values of the region is obtained, and the plurality of DC compensation values are obtained accordingly. The calibration method as described in claim 5, wherein the precision of the DC compensation can be less than one gray scale. The calibration method as described in claim 5, wherein the plurality of sub-display areas in the second display area use a red-green-blue (RGB) system, a red-green-blue-white (RGBW) system, an amber-green-blue (Amber-green-blue) system GB) system or Yellow Cyan Magenta system. The calibration method as described in item 5 of the scope of the application further comprises the following steps: Under the same gray-scale binding point, adjust the DC compensation value of a first sub-display area, a second sub-display area and a third sub-display area in the second display area, so that the The optical measurement values of the first sub-display area, the second sub-display area and the third sub-display area can be consistent with the first optical measurement value of the first display area; obtaining the first sub-display The DC compensation value of the 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 through linear interpolation. The calibration method according to item 5 of the scope of the application, further comprising the following steps: simultaneously lighting the first sub-display area and the second sub-display area in different proportions in the second display area under the same gray-scale binding point area and the third sub-display area, become the fourth sub-display area, and adjust the DC compensation values of the first sub-display area, the second sub-display area and the third sub-display area, so that the first sub-display area, The optical measurement values of the second sub-display area and the third sub-display area tend to be consistent with the first optical measurement value of the first sub-display area; obtaining the fourth sub-display area relative to the first sub-display area The DC compensation value of the 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 first sub-display area The DC compensation value of , 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 through linear interpolation. A calibration device applied to a display panel, the display panel includes a first display area and a second display area, the calibration device includes: A removal of display unevenness (Demura) module, used for removing display unevenness (Demura) from the first display area and the second display area; an optical measurement module, used for the first display area and the second display area. The second display area is optically measured to obtain a first optical measurement value of the first display area and a second optical measurement value of the second display area; an alternating current (AC) calibration module, using AC calibration is performed on the first display area and the second display area to eliminate AC between the first optical measurement value of the first display area and the second optical measurement value of the second display area error; and a direct current (DC) calibration module for performing DC calibration on the second display area to eliminate the second optical measurement value of the second display area and the first optical measurement value of the first display area The DC error between the measurement values causes the second optical measurement value of the second display area after calibration to be consistent with the first optical measurement value of the first display area. The calibration 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 and the second pixel density being equal or different. The calibration device of claim 11, wherein the first optical measurement value and the second optical measurement value are luminance or color coordinates. The calibration device of claim 11, wherein the DC calibration module adopts a multi-region compensation (Multi-Region Compensation, MRC) method to perform DC calibration on the second display region. The calibration device of claim 14, wherein the DC calibration module comprises: a defining unit, used to define the positions of a plurality of sub-display areas in the second display area; a statistical unit, used to count a plurality of optical measurement values of the plurality of sub-display areas to obtain current statistical data; a generating unit, for generating a plurality of DC compensation values corresponding to the plurality of sub-display regions according to the current statistical data; and a compensation unit for generating the plurality of sub-display regions in the second display region respectively according to the plurality of DC compensation values DC compensation is performed on the plurality of optical measurement values of the second display area, so that the plurality of optical measurement values of the plurality of sub-display areas in the second display area are all tending to the first optical measurement value of the first display area. Consistent. The calibration device of claim 15, wherein the generating unit obtains the optical measurement values of the sub-display areas in the second display area and the optical measurement values of the first display area according to the current statistical data The difference between the first optical measurement values is used to obtain the plurality of DC compensation values. The calibration device as claimed in claim 15, wherein the fineness of the DC compensation performed by the compensation unit can be smaller than a gray scale. The calibration device as claimed in claim 15, wherein the plurality of sub-display areas in the second display area are red-green-blue (RGB) system, red-green-blue-white (RGBW) system, amber-green-blue (Amber-green-blue) system GB) system or Yellow Cyan Magenta system. The calibration device according to claim 15, wherein under the same gray-scale binding point, the DC calibration module further adjusts a first sub-display area and a second sub-display area in the second display area and a DC compensation value of a third sub-display area, resulting in the second display The optical measurement values of the first sub-display area, the second sub-display area, and the third sub-display area in the area can tend to be consistent with the first optical measurement value of the first display area, so as to obtain the 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 are obtained through linear interpolation to obtain the DC compensation values of other grayscale binding points. The calibration device as described in claim 15, wherein under the same gray-scale binding point, the DC calibration module also simultaneously lights the first sub-display area, the second sub-display area and the second display area in different proportions in the second display area. The sub-display area and the third sub-display area become the fourth sub-display area, and the DC compensation values of the first sub-display area, the second sub-display area and the third sub-display area are adjusted so that the first sub-display area The optical measurement values of the 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 the fourth sub-display area is obtained relative to the third sub-display area. The DC compensation value of a 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 first sub-display area The DC compensation value of the sub-display area, the DC compensation value of the second sub-display area, and the DC compensation value of the third sub-display area are obtained through linear interpolation to obtain the DC compensation values of other gray-scale binding points.

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