CN218333091U - Area compensation device applied to display panel - Google Patents
Area compensation device applied to display panel Download PDFInfo
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- CN218333091U CN218333091U CN202222422694.0U CN202222422694U CN218333091U CN 218333091 U CN218333091 U CN 218333091U CN 202222422694 U CN202222422694 U CN 202222422694U CN 218333091 U CN218333091 U CN 218333091U
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Abstract
The utility model discloses a be applied to display panel's regional compensation arrangement. The display panel has a plurality of regions including at least one functional region. The area compensation device comprises a compensation data storage unit used for storing a plurality of groups of candidate compensation values set for the at least one functional area; the control unit is used for receiving current display state information inside the display panel; the computing unit is respectively coupled with the control unit and the compensation data storage unit, and the control unit controls the computing unit to select a corresponding group of candidate compensation values from the plurality of groups of candidate compensation values stored in the compensation data storage unit according to the current display state information in the display panel; and the compensation unit is coupled with the calculation unit and carries out real-time compensation on the at least one functional area by the group of candidate compensation values so as to ensure that the overall display effect of the display panel is consistent.
Description
Technical Field
The present invention relates to a display panel, and more particularly, to an area compensation device for a display panel.
Background
As shown in fig. 1, in a special area (e.g., a lower-screen camera (UDC) area R2) on an Organic Light Emitting Diode (OLED) display panel, due to material differences, internal routing differences, and other factors, a Gamma curve of the display panel may have a condition that does not meet exponential characteristics in a low gray scale and a low luminance (e.g., l32@ 2nit), and Mura may also have abnormal abrupt change.
However, since the optical data obtained under the conventional photographing conditions (e.g. photographing at 450 nit) does not reflect the Mura at such very low brightness, and the Gamma curve has deviated, the conventional method of predicting and calculating the Demura compensation value based on the Gamma curve of the display panel is difficult to compensate accurately, and a specific area compensation technique is required.
Please refer to fig. 2A to fig. 2C. As shown in fig. 2A, in an ideal state, the Gamma curve of the display panel has a smooth exponential trend, so that an accurate Demura compensation value can be predicted based on the Gamma curve for compensation. As shown in fig. 2B, when the Gamma curve of the display panel drops in a cliff manner, if the prediction and Demura compensation are still performed with a smooth exponential curve, a particularly dark region will appear on the display panel. As shown in fig. 2C, when the Gamma curve of the display panel drops "too slowly", if the prediction and Demura compensation are still performed with a smooth exponential curve, an extra bright area will appear on the display panel.
In addition, as environmental conditions such as temperature/light change, a luminance difference is easily generated between an area of an under screen camera (UDC) and a surrounding area on an Organic Light Emitting Diode (OLED) display panel. As shown in fig. 3, after lighting and temperature change, due to different factors such as screen materials and circuits in different regions, the luminance curves of the two regions R1 (normal display region) and R2 (UDC region) may be inconsistent with the temperature change curve, and further, a significant luminance difference may be shown, which may result in a reduction in user experience.
As shown in fig. 4, since the OLED panel is attached with a light-transmitting film (e.g., a polarizer), but the UDC region R2 needs to transmit light, the OLED panel is cut with a rectangular UDC region R2. When the light is weak and the compensation condition of the UDC region R2 is good, the luminance abnormality is not easily observed. However, under strong light conditions, the light-transmitting film under the normal display region R1 may slightly reflect, which may cause abnormal phenomena that the normal display region R1 is brighter and the UDC region R2 is relatively darker.
From the above, it can be seen that: the prior art still suffers from various problems to be further solved.
Disclosure of Invention
Therefore, the present invention provides a region compensation device applied to a display panel to effectively solve the above-mentioned problems encountered in the prior art.
According to a preferred embodiment of the present invention, the device is applied to a display panel. In this embodiment, the display panel has a plurality of regions including at least one functional region. The area compensation device comprises a control unit, a compensation data storage unit, a calculation unit and a compensation unit. The computing unit is respectively coupled with the control unit and the compensation data storage unit. The compensation data storage unit is used for storing a plurality of groups of candidate compensation values set for the at least one functional area. The control unit controls the calculation unit to select a corresponding group of candidate compensation values from the plurality of groups of candidate compensation values stored in the compensation data storage unit according to the current display state information in the display panel, and the compensation unit performs real-time compensation on the at least one functional area according to the group of candidate compensation values, so that the overall display effect of the display panel is consistent.
In one embodiment, the at least one functional area is a video-under-screen camera (UDC) area having a video-under-screen function.
In one embodiment, the current display state information is a current Display Brightness Value (DBV), a current display frame rate and/or a current Display Brightness Value (DBV) mode of the display panel.
In an embodiment, the plurality of candidate compensation values respectively correspond to a plurality of different display state information inside the display panel, and the plurality of different display state information are different DBVs, different display frame rates, and/or different DBV modes of the display panel.
Compared with the prior art, the area compensation device applied to the display panel can utilize a Multi-Choice area compensation technology (MCRC) to perform real-time compensation on the specific functional area by adopting different compensation values according to the current display state information inside the display panel, and can also utilize an area brightness difference compensation technology to find out a corresponding candidate compensation value from the compensation value lookup table according to the current environmental condition information to perform real-time compensation on the specific functional area, so as to eliminate the discontinuous sense among different areas of the display panel, and thus the overall display effect of the display panel is consistent.
Drawings
FIG. 1 shows that a dark or bright phenomenon occurs in a specific area of a display panel under low gray scale and low brightness in the prior art.
Fig. 2A is a schematic diagram illustrating a smooth exponential trend of the Gamma curve of the display panel under an ideal condition.
Fig. 2B to fig. 2C are schematic diagrams respectively illustrating that the Gamma curve of the display panel is in a "cliff" type or a "too slow" descending state in an abnormal state.
Fig. 3 is a schematic diagram showing that after lighting and temperature change, the luminance curves of two regions of the display panel are inconsistent with the temperature change curve, and further a significant luminance difference is shown.
FIG. 4 is a diagram illustrating that under high light conditions, the normal display area is brighter and the UDC area is darker.
FIG. 5 is a flowchart illustrating a method for compensating an area of a display panel according to a preferred embodiment of the present invention.
FIG. 6 shows an embodiment of a multi-selection zone compensation (MCRC) method used by the zone compensation apparatus.
FIG. 7 is a diagram illustrating an embodiment of generating candidate offset values.
FIG. 8A illustrates an embodiment of a memory storing multiple sets of MCRC compensation values.
FIG. 8B shows an embodiment in which multiple sets of MCRC compensation values correspond to different DBV, frequency, and DBV modes, respectively.
FIG. 9 is a block diagram of a multi-selection zone compensation apparatus according to another preferred embodiment of the present invention.
Fig. 10 shows that the dark or bright phenomena of the special area on the display panel under low gray scale and low brightness can be effectively improved after the multi-selection area compensation.
FIG. 11 is a flowchart illustrating a method for compensating an area of a display panel according to another preferred embodiment of the present invention.
FIG. 12 shows an embodiment of a method for compensating a zone in a zone compensation apparatus, which includes a recording stage and a compensation stage.
FIG. 13 is a block diagram of a zone compensation apparatus according to another preferred embodiment of the present invention.
Description of the main element symbols:
PL … display panel
R1 … first region
R2 … second region
R3 … third region
S10 … step
S12 … step
MCRC _0 … original compensation value
MCRC _1 … first candidate compensation value
MCRC _2 … second candidate compensation value
MCRC _3 … third candidate compensation value
DBV … shows luminance values
DBV _ MAX … maximum display luminance value
DBV _ MIN … minimum display luminance value
BP 0-BPN … degree of freedom
G1-G255 … gray scale value
k 1 x+b 1 … function
k 2 x+b 2 … function
k 3 x+b 3 … function
HEADER of HEADER …
Original DATA of the second region R2_ ORG DATA …
CHECKSUM … CHECKSUM
DATA1 … input DATA
DATA2 … output DATA
FR … frame Rate
DEMURATION UNDERGROUND COMPENSATION VALUE DEMURATION (DEMURA) …
9 … multi-selection area compensation device
90 … control unit
92 … compensated data storage unit
94 … computing unit
96 … compensation unit
MCRC … multi-selection area compensation
R … red subpixel
G … green subpixel
B … blue subpixel
S20 … step
S22 … step
LUT … compensation value lookup table
AP … platform end
TS … temperature sensor
CP … compensated data processing unit
INF1 … Current temperature information
INF2 … Current illuminance information
ADD … adder
Detailed Description
According to a preferred embodiment of the present invention, the device is applied to a display panel. In this embodiment, the display panel has a plurality of regions including at least one functional region. For example, the display panel may be an Organic Light Emitting Diode (OLED) display panel, and the at least one functional area may be an under-screen camera (UDC) area having an under-screen camera function, but is not limited thereto.
Referring to fig. 5, fig. 5 is a flowchart illustrating a region compensation method applied to a region compensation apparatus of a display panel according to this embodiment. As shown in fig. 5, the area compensation method applied to the area compensation apparatus of the display panel includes the following steps:
step S10: setting a plurality of groups of candidate compensation values for the at least one functional area; and
step S12: and selecting a corresponding group of candidate compensation values from the plurality of groups of candidate compensation values according to the current display state information in the display panel to compensate the at least one functional area in real time, so that the whole display effect of the display panel is consistent.
In practical applications, the at least one functional area may be an under-screen camera (UDC) area having an under-screen camera function, but is not limited thereto; the current display state information may be a current Display Brightness Value (DBV), a current display frame rate and/or a current DBV mode of the display panel, and the plurality of different display state information may be different DBVs, different display frame rates and/or different DBV modes of the display panel, but not limited thereto; the plurality of sets of candidate compensation values may respectively correspond to a plurality of different display state information inside the display panel, but is not limited thereto.
In another embodiment, step S10 may further include the following steps: the original compensation values are converted into the candidate compensation values according to a specific function, wherein the specific function may include coefficients independently set for red (R), green (G), and blue (B) sub-pixels of the display panel, but is not limited thereto.
In another embodiment, step S10 may further include the following steps: different images of the display panel are captured under different display states of the display panel respectively, and the plurality of groups of candidate compensation values are calculated according to the images, wherein the plurality of groups of candidate compensation values are independent of a group of original compensation values.
In addition, the gray-scale values displayed on the display panel may have N degrees of freedom (N is a positive integer), and the area compensation device may perform step S10 on the N degrees of freedom, respectively, but not limited thereto.
Referring to fig. 6, fig. 6 shows an embodiment of a Multi-Choice Region compensation (MCRC) method employed by the Region compensation apparatus. As shown in fig. 6, the display panel PL includes a first region (normal display region) R1 and a second region (functional region) R2. The MCRC method sets a plurality of sets of candidate compensation values MCRC _0 to MCRC _3 for the second region (functional region) R2. Wherein MCRC _0 is an original compensation value corresponding to a display brightness value of 100nit to 500nit; MCRC _1 is a first candidate compensation value corresponding to the display brightness value of 20nit to 100nit; MCRC _2 is a second candidate compensation value corresponding to the display luminance value of 10nit to 20nit; MCRC _3 is a third candidate compensation value corresponding to display luminance values 2nit to 10nit. In other words, the plurality of sets of candidate compensation values MCRC _0 to MCRC _3 respectively correspond to the display luminance values from the maximum display luminance value DBV _ MAX to the minimum display luminance value DBV _ MIN, but not limited thereto.
Referring to fig. 7, fig. 7 is a diagram illustrating an embodiment of generating candidate offset values. As shown in fig. 7, the generation of the candidate compensation values can be set in a variety of different ways. For example:
(1) The first to third candidate compensation values MCRC _1 to MCRC _3 may be converted from the original compensation value MCRC _0 according to a specific function (e.g., y = kx + B) and the coefficients of the red (R)/green (G)/blue (B) sub-pixels may be independently set;
(2) The first to third candidate compensation values MCRC _1 to MCRC _3 can also be obtained independently of the original compensation value MCRC _0 in other ways, such as taking a picture under specific conditions and calculating the corresponding candidate compensation values; and
(3) Since the Gray-scale values Gray0 to Gray255 displayed on the display panel may have N degrees of freedom (N is a positive integer), each degree of freedom may perform the process (1) or (2), but not limited thereto.
Referring to fig. 8A and 8B, fig. 8A illustrates an embodiment of storing multiple sets of MCRC compensation values in a memory; FIG. 8B shows an embodiment in which multiple sets of MCRC compensation values correspond to different DBV, frequency, and DBV modes.
As shown in fig. 8A, the memory may sequentially store the HEADER, the original DATA R2_ ORG DATA of the second area, the original compensation value MCRC _0, the first candidate compensation value MCRC _1 to the third candidate compensation value MCRC _3, and the CHECKSUM cheksum, but not limited thereto.
As shown in fig. 8B, the original compensation value MCRC _0 corresponds to DBV =100 to 500nit, a frequency of 60Hz, and a DBV mode thereof being a normal mode; the first to third candidate compensation values MCRC _1 to MCRC _3 correspond to DBV =20 to 100nit, 10 to 20nit, 2 to 10nit, frequencies 60Hz, 90Hz, 120Hz, 144Hz, and DBV mode thereof being DC mode, respectively.
Referring to fig. 9, fig. 9 is a functional block diagram of a multi-selection zone compensation device according to another preferred embodiment of the present invention. As shown in fig. 9, the multi-selection area compensation apparatus 9 includes a control unit 90, a compensation data storage unit 92, a calculation unit 94 and a compensation unit 96. The compensation data storage unit 92 is coupled to the control unit 90. The control unit 90 is coupled to the calculation unit 94. The calculation unit 94 is coupled to a compensation unit 96. The control unit 90 receives the input DATA1, the frame rate FR/the display luminance value DBV, the brightness unevenness compensation value DEMURA, the original compensation value MCRC _0, the first candidate compensation value MCRC _1, the second candidate compensation value MCRC _2, or the third candidate compensation value MCRC _3 stored in the compensation DATA storage unit 92, respectively, and calculates by the calculation unit 94, and outputs the compensated DATA2 after the compensation unit 96 compensates the input DATA1 according to the brightness unevenness compensation value DEMURA, the original compensation value MCRC _0, the first candidate compensation value MCRC _1, the second candidate compensation value MCRC _2, or the third candidate compensation value MCRC _3.
Referring to fig. 10, fig. 10 shows that the dark or bright phenomena of the special area on the display panel under low gray scale and low brightness can be effectively improved after the multi-selection area compensation. As shown in fig. 10, before the compensation improvement of the multi-selection area, the second area R2 on the display panel PL is darker than the first area R1 with normal brightness in the low gray scale (L32) and low brightness (2 nit) and the third area R3 is brighter than the first area R1 with normal brightness. After the multi-selection area compensation improvement is performed, since the third candidate compensation value MCRC _3 corresponding to the low luminance (2 nit) is used to brighten the second area R2 on the display panel PL and dim the third area R3 on the display panel PL, the luminances displayed by the second area R2 and the third area R3 on the display panel PL will both approach the normal luminance displayed by the first area R1, so as to effectively eliminate the discontinuous feeling among different areas of the display panel PL, and thus the overall display effect of the display panel PL is consistent.
Another preferred embodiment according to the present invention is also a region compensation method applied to a region compensation apparatus of a display panel. In this embodiment, the display panel has a plurality of regions including at least one functional region.
Referring to fig. 11, fig. 11 is a flowchart illustrating a region compensation method applied to a region compensation apparatus of a display panel according to this embodiment. As shown in fig. 11, the area compensation method applied to the display panel includes the following steps:
step S20: generating a compensation value lookup table comprising a plurality of sets of candidate compensation values according to the optical data of the plurality of regions of the display panel under a plurality of different environmental conditions; and
step S22: and finding out a corresponding group of candidate compensation values from the plurality of groups of candidate compensation values of the compensation value lookup table according to the current environmental condition information to perform real-time compensation on the at least one functional area, so that the overall display effect of the display panel is consistent.
In practical applications, the at least one functional area may be a video under screen (UDC) area having a video under screen function, but not limited thereto; the plurality of different environmental conditions may include, but is not limited to, different temperatures and/or different illumination intensities; the current environmental condition information includes current temperature information and/or current illumination intensity information, and may be provided by the platform end or measured by the environmental condition sensor, but is not limited thereto; the compensation value lookup table may include a plurality of compensation value recording units for respectively recording the plurality of sets of candidate compensation values of the display panel operating at a plurality of different frame rates, but not limited thereto.
In another embodiment, the plurality of regions of the display panel further includes at least one normal display region, and the step S22 uses the display luminance value of the at least one normal display region as the target luminance value and compensates the display luminance value of the at least one functional region to the target luminance value, i.e. performs the region compensation for the display panel, but not limited thereto.
In another embodiment, the plurality of regions of the display panel further includes at least one normal display region, and the step S22 is to compensate the display luminance values of the at least one functional region and the at least one normal display region to their respective preset target luminances respectively, i.e. to perform global compensation for the display panel, but not limited thereto.
It should be noted that, the highest gray level value of the gray level values displayed on the display panel can be compensated upwards through the extrapolation mode, and the gray level values displayed on the display panel have N degrees of freedom (N is a positive integer), and the compensation value between the N degrees of freedom is calculated through a specific function, but not limited thereto.
Referring to fig. 12, fig. 12 shows an embodiment of a method for area compensation of an area compensation apparatus including a recording stage and a compensation stage. As shown in fig. 12, in the recording stage, the area compensation device collects the optical data of the first area R1 and the second area R2 of the display panel under different temperatures/illumination intensities and converts the optical data into compensation data, and generates and stores the compensation value look-up table LUT in the memory for later use.
In the compensation stage, the area compensation device obtains the current temperature information INF1 and the current illuminance information INF2 from the platform AP, and accordingly finds out a corresponding compensation value from the compensation value look-up table LUT and outputs the compensation value to the display panel PL to compensate the second area R2 of the display panel PL, so that the overall display effect of the display panel PL is consistent.
In practical applications, the area compensation device can perform multi-dimensional recording by using frame rate, display Brightness Value (DBV), gray scale (R/G/B), etc., but not limited thereto.
Referring to fig. 13, fig. 13 is a functional block diagram of a local compensation device according to another preferred embodiment of the present invention. As shown in fig. 13, the area compensation means may include a temperature sensor TS, a compensation data processing unit CP, and an adder ADD. The temperature sensor TS is coupled to the compensation data processing unit CP. The compensation data processing unit CP is coupled to the adder ADD. The compensation DATA processing unit CP receives the current temperature information INF1 and the current illuminance information INF2 provided by the platform AP, the temperature value sensed by the temperature sensor TS, the input DATA1, the frame rate FR, the display brightness value DBV, and finds out a corresponding compensation value from the compensation value look-up table LUT, and outputs the compensation value to the adder ADD. The adder ADD ADDs the input DATA1 and the compensation value to generate output DATA2.
In practical applications, the compensation value look-up table LUT may include a plurality of compensation value recording units for respectively recording a plurality of sets of candidate compensation values of the display panel PL operating at a plurality of different frame rates (e.g., F1, F2, F3, …, FN).
TABLE 1
For example, the first compensation value recording unit of the compensation value lookup table LUT can be used to record multiple sets of candidate compensation values operating at the first frame rate F1 as the display panel PL shown in table 1, wherein Ta to Tk represent different temperatures, DBV _ N1 to DVB _ NM represent different normal display brightness values, DBV _ HBM1 to DBV _ HBM3 represent compensation values at different high ambient light intensities, G1 to GN represent different gray level tie point settings, a11 to kmn represent compensation values at different temperatures, display brightness values, and gray level values, but not limited thereto. Wherein, the compensation precision is based on gray scale as unit, the compensation bit depth is 3-4 bits, G1-GN are set for measuring binding points, and the compensation value between binding points is calculated in equation mode.
In one embodiment, the amount of data to be recorded by the compensation unit is calculated as follows: the single seed pixel data amount Q _ W = compensation bit depth (4 bits) × 3 gray scale tie points (G1 to G3) × (5 DBV _ N1 to DBV _ N5+3 DBV _ HBM1 to DBV _ HBM 3) = 4 frequencies (F1 to F4) =384 bits, so that the three sub-pixel total data amounts Q _ RGB = Q _ W =3 kinds (R/G/B) =1152 bits. This data amount is burned into a memory (e.g., flash memory Flash), and is negligible because its percentage is small.
Compared with the prior art, the area compensation device applied to the display panel can utilize the multi-selection area compensation technology (MCRC) to perform real-time compensation on the specific functional area by adopting different compensation values according to the current display state information inside the display panel, and can also utilize the area brightness difference compensation technology to find out the corresponding candidate compensation value from the compensation value lookup table according to the current environmental condition information to perform real-time compensation on the specific functional area, so as to eliminate the sense of discontinuity among different areas of the display panel, and thus the overall display effect of the display panel is consistent.
Claims (4)
1. An area compensation device applied to a display panel, wherein the display panel has a plurality of areas and the plurality of areas include at least one functional area, the area compensation device comprising:
a compensation data storage unit for storing a plurality of sets of candidate compensation values set for the at least one functional area;
a control unit for receiving the current display state information inside the display panel;
a computing unit coupled to the control unit and the compensation data storage unit, respectively, wherein the control unit controls the computing unit to select a corresponding set of candidate compensation values from the plurality of sets of candidate compensation values stored in the compensation data storage unit according to the current display state information inside the display panel; and
and the compensation unit is coupled with the calculation unit and used for carrying out real-time compensation on the at least one functional area by using the set of candidate compensation values so as to ensure that the whole display effect of the display panel is consistent.
2. The area compensation device as claimed in claim 1, wherein the at least one functional area is an area of an off-screen camera having an off-screen camera function.
3. The device of claim 1, wherein the current display state information is a current display brightness value, a current display frame rate and/or a current display brightness value mode of the display panel.
4. The apparatus of claim 1, wherein the plurality of candidate compensation values respectively correspond to a plurality of different display state information within the display panel, and the plurality of different display state information are different display brightness values, different display frame rates, and/or different display brightness value patterns of the display panel.
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