TWI646840B - Compression method of compensation data of oled display panel - Google Patents

Abstract

A method for compressing compensation data of an organic light emitting diode display panel, comprising: acquiring compensation data corresponding to an organic light emitting diode display panel; converting the compensation data into a low frequency part, a high frequency part and a very high frequency part; and encoding The low frequency part, the high frequency part and the very high frequency part are used to obtain the compensated compensation data. The organic light emitting diode display panel includes a plurality of pixel points, and the high frequency portion is divided into a plurality of blocks according to i*i pixel points, and then the plurality of blocks are classified and sampled to encode a high frequency portion, and i is greater than 1 The integer.

Description

Compression method for compensating data of organic light emitting diode display panel

The disclosed embodiments relate to a compression method, and in particular to a compression method for compensation data of an organic light emitting diode display panel.

The Organic Light Emitting Diode (OLED) display panel has self-illumination, does not require a backlight, and has high contrast, thin thickness, wide viewing angle, fast response speed, and can be used for a flexible panel and a temperature range. It is considered to be a flat-panel display with great development potential due to its excellent characteristics such as wide structure, simple structure and simple process.

At present, in the production process of an OLED display panel, Mura (uneven brightness) is often generated due to process limitations and the like, resulting in a decrease in display quality of the OLED display panel. In order to eliminate the Mura of the OLED display panel, the prior art generally uses a compensation table to store compensation information of each pixel in the OLED display panel. When the OLED display panel displays an image, the driver board looks up the compensation table to adjust the signal, and raises the signal of the over-dark area of the OLED display panel, and lowers the signal of the over-bright area, thereby presenting a uniform display effect.

In the compensation table, each pixel corresponds to a set of compensation information, so the size of the compensation table of the OLED display panel is equivalent to the number of pixels multiplied by the size of each set of compensation information. However, as the size of the OLED display panel increases, the number of pixel points increases, which makes the compensation table occupy a large amount of system storage space, which extremely consumes the hardware resources of the OLED display panel.

The purpose of the disclosure is to provide a method for compressing compensation data of an OLED display panel, which can effectively compress the compensation data of the OLED display panel and reduce the system storage space occupied by the compensation data.

According to the above object of the present disclosure, a method for compressing compensation data of an OLED display panel includes: obtaining compensation data corresponding to an OLED display panel; converting the compensation data into a low frequency portion, a high frequency portion, and an extremely high frequency portion; and encoding The low frequency part, the high frequency part and the very high frequency part are used to obtain the compensated compensation data. The OLED display panel includes a plurality of pixel points. After the high frequency portion is divided into a plurality of blocks according to i*i pixels, the plurality of blocks are classified and sampled to encode a high frequency portion, and i is an integer greater than 1.

In some embodiments, the method for compressing compensation data of the OLED display panel further includes: dividing the compensation data into a plurality of blocks according to i*i pixels before converting the compensation data. The compensation data includes a plurality of compensation values corresponding to a plurality of pixel points, respectively.

In some embodiments, converting the compensation data into a low frequency portion, a high frequency portion, and an extremely high frequency portion comprises: performing outlier statistics on the compensation data to obtain an extremely high frequency portion; deducting the extremely high frequency from the compensation data The portion is then subjected to Mean Filter processing to obtain the low frequency portion; and the extremely high frequency portion and the low frequency portion are subtracted from the compensation data to obtain the high frequency portion.

In some embodiments, converting the compensation data into the extremely high frequency portion comprises: calculating a difference value corresponding to each pixel point, wherein the difference value is a compensation value of the corresponding pixel point and a region where the corresponding pixel point is located The difference between the average values of the plurality of compensation values of the other plurality of pixels in the block; the j pixel points corresponding to the j difference values of the plurality of difference values among the plurality of blocks located in the same column The j is an outlier, where j is a positive integer; and the extremely high frequency portion is composed of a plurality of offset values of the plurality of outliers and a plurality of locations where the plurality of outliers respectively correspond to the OLED display panel.

In some embodiments, converting the compensation data to the low frequency portion comprises: defining a plurality of pixel points that are not defined as the plurality of outliers as a plurality of non-outlier points; calculating a corresponding low frequency value of each pixel point Wherein the low frequency value is an average of a plurality of compensation values of the plurality of non-outlier points included in the block in which the corresponding pixel point is located; and the low frequency portion is a plurality of low frequency values corresponding to the plurality of pixel points respectively The plurality of pixels are composed of a plurality of positions corresponding to the OLED display panels.

In some embodiments, encoding the very high frequency portion includes: encoding a plurality of offset values for the plurality of outliers and a plurality of locations corresponding to the plurality of outliers on the OLED display panel.

In some embodiments, encoding the low frequency portion includes: separately sampling a plurality of low frequency values corresponding to the plurality of pixel points and a plurality of pixel points respectively at a plurality of positions corresponding to the OLED display panel. Isometric sampling and encoding the sampling results.

In some embodiments, encoding the high frequency portion includes: dividing the high frequency portion into a plurality of blocks according to i*i pixel points, classifying the plurality of blocks to classify the plurality of data types; performing statistics The k-group data type with the largest number of the plurality of blocks in the plurality of data types is found, wherein k is a positive integer; the k-group data type is index-encoded to obtain a corresponding k-pen index value; The data type corresponding to each block is obtained, thereby obtaining an index value corresponding to each block; and encoding a plurality of data types and a plurality of index values corresponding to the plurality of blocks.

In some embodiments, the method for finding the data type corresponding to the block by comparing the plurality of data types is: respectively calculating a plurality of Sum of Absolute Differences (SAD) of the block and the plurality of sets of data types; The data type corresponding to the absolute error and the smallest one is the data type corresponding to the block.

In some embodiments, the method for compressing compensation data of the OLED display panel further includes: storing the compressed compensation data into a storage unit of the OLED display panel.

The above described features and advantages of the present invention will be more apparent from the following description.

1000‧‧‧Compression method of compensation data for OLED display panel

1100, 1200, 1300, 1310, 1320, 1330, 1340, 1350, 1360, 1400, 1410, 1420, 1430, 1440, 1450, 1500 ‧ ‧ steps

A better understanding of the aspects of the present disclosure can be obtained from the following detailed description taken in conjunction with the drawings. It should be noted that, according to industry standard practices, the features are not drawn to scale. In fact, in order to make the discussion clearer, The size of each feature can be arbitrarily increased or decreased.

FIG. 1 is a flowchart of a method of compressing compensation data of an OLED display panel according to an embodiment of the present disclosure.

2 is a flow chart for converting compensation data into an extremely high frequency portion in accordance with an embodiment of the present disclosure.

[Fig. 3] is a flow chart for converting compensation data into a low frequency portion in accordance with an embodiment of the present disclosure.

FIG. 4 is a flow chart of encoding a high frequency portion in accordance with an embodiment of the present disclosure.

Embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific content. The examples discussed and disclosed are illustrative only and are not intended to limit the scope of the invention.

1 is a flow diagram of a method 1000 of compressing compensation data for an OLED display panel in accordance with an embodiment of the present disclosure. The compression method 1000 for compensating data of the OLED display panel includes steps 1100 to 1500. In step 1100, compensation data corresponding to the OLED display panel is obtained. The OLED display panel includes a plurality of pixel points. In an embodiment of the disclosure, the OLED display panel includes m*n pixels.

In step 1200, the compensation data is divided into a plurality of blocks according to i*i pixels, and i is an integer greater than 1. In an embodiment of the present disclosure, i=2, that is, the compensation data is divided into (m*n/4) blocks in step 1200. However, the disclosure is not limited thereto.

At step 1300, the compensation data is converted to a low frequency portion, a high frequency portion, and an extremely high frequency portion. The compensation data includes a plurality of compensation values respectively corresponding to the plurality of pixel points. In step 1300, outlier statistics are performed on the compensation data to obtain an extremely high frequency portion. 2 is a flow diagram of converting compensation data to an extremely high frequency portion, including steps 1310-1330, in accordance with an embodiment of the present disclosure.

In step 1310, a difference value corresponding to each pixel point is calculated, where the difference value is a compensation value of the corresponding pixel point and a plurality of compensation values of other plurality of pixel points in the block where the corresponding pixel point is located. The difference between the averages. In an embodiment of the disclosure, i=2, that is, there are four pixel points in each block, so the difference value is the compensation value of the corresponding pixel point and the block in the block where the corresponding pixel point is located. The difference between the average values of the three compensation values of the other three pixels.

In step 1320, j pixels corresponding to the largest j difference values among the plurality of difference values in the plurality of blocks in the same column are defined as j outliers, where j is a positive integer. In an embodiment of the present disclosure, j=5, that is, a plurality of blocks located in the same column have 5 outliers. In other words, the OLED display panel has (5*m/2) outliers. In step 1330, the extremely high frequency portion is composed of a plurality of offset values of the plurality of outliers and a plurality of locations where the plurality of outliers respectively correspond to the OLED display panel.

Referring back to FIG. 1, in step 1300, the compensation data is deducted from the extremely high frequency portion and then subjected to Mean Filter processing to obtain the low frequency portion. In step 1300, the compensation data is deducted from the extremely high frequency portion and the low portion. The frequency portion is used to obtain the high frequency portion. 3 is a flow diagram of converting compensation data to a low frequency portion, including steps 1340 through 1360, in accordance with an embodiment of the present disclosure.

At step 1340, pixels that are not defined as outliers are defined as non-outliers. In other words, the composition of the compensation value corresponding to each non-outlier point is to subtract the compensation data from the extremely high frequency portion. In step 1350, a low frequency value corresponding to each pixel point is calculated, and the low frequency value is an average value of a plurality of compensation values of the plurality of non-outlier points included in the block in which the corresponding pixel point is located. In step 1360, the low frequency portion is composed of a plurality of low frequency values respectively corresponding to the plurality of pixel points and a plurality of positions corresponding to the plurality of pixel points respectively on the OLED display panel.

Returning to FIG. 1, in step 1400, the low frequency portion, the high frequency portion, and the very high frequency portion are encoded to obtain compressed compensation data. In step 1400, the encoding the very high frequency portion includes: encoding a plurality of offset values for the plurality of outliers and a plurality of locations corresponding to the plurality of outliers on the OLED display panel.

In step 1400, the encoding the low frequency portion includes: performing a distance sampling or a non-equidistant sampling on the plurality of low frequency values respectively corresponding to the plurality of pixel points and the plurality of pixel points respectively corresponding to the OLED display panel; The sampling results are encoded. It is worth mentioning that since the low frequency part represents a smooth image with little change in brightness or gray scale value, the encoding of the low frequency part can be equally spaced, that is, sampling every few pixels. Thereby reducing the number of sampling points in the low frequency portion and increasing the compression ratio. In addition, the encoding of the low frequency portion can also be used for non-equidistant sampling, because the brightness or grayscale value generally changes greatly at the edge portion of the smoothed image, so the smooth image is The edge portion can correspondingly adopt a sampling method with a smaller pitch. Conversely, a non-edge portion of the smoothed image can correspondingly adopt a sampling method with a larger pitch, thereby improving the distortion after compression.

4 is a flow diagram of encoding a high frequency portion in accordance with an embodiment of the present disclosure, including steps 1410-1450. In step 1410, after dividing the high frequency portion into a plurality of blocks according to i*i pixels, the plurality of blocks are classified to classify the plurality of data types. In step 1420, statistics are performed to find the k-group data types with the largest number of comparisons among the plurality of sets of data types, where k is a positive integer. In an embodiment of the present disclosure, k=16, that is, statistics are performed to find out the 16 groups of data types having the largest number of comparisons among the plurality of sets of data types, but the disclosure is not limited thereto.

In step 1430, the k sets of data types are index encoded to obtain corresponding k-pen index values. In step 1440, the data types corresponding to each block are found to be obtained, thereby obtaining an index value corresponding to each block. In step 1450, multiple sets of data types and multiple index values corresponding to the plurality of blocks are encoded.

In step 1440, the method for finding the data type corresponding to the block is: calculating the Sum of Absolute Differences (SAD) of the block and the plurality of sets of data types respectively; and taking multiple absolute errors. The data type corresponding to the smallest one is the data type corresponding to the block.

Returning to FIG. 1, in step 1500, the compressed compensation data is stored in a storage unit of the OLED display panel.

In summary, the present disclosure proposes an OLED display panel The compression method of the compensation data can effectively compress the compensation data of the OLED display panel and reduce the system storage space occupied by the compensation data.

The features of several embodiments are summarized above, and those skilled in the art will be able to understand the aspects of the disclosure. Those skilled in the art will appreciate that the present disclosure can be readily utilized as a basis for designing or modifying other processes and structures, thereby achieving the same objectives and/or achieving the same advantages as the embodiments described herein. . It should be understood by those skilled in the art that the invention may be made without departing from the spirit and scope of the disclosure.

Claims (10)

A method for compressing compensation data of an organic light emitting diode (OLED) display panel, comprising: acquiring a compensation data corresponding to an OLED display panel, wherein the OLED display panel comprises a plurality of pixel points; The compensation data is converted into a low frequency portion, a high frequency portion and a high frequency portion; and the low frequency portion, the high frequency portion and the high frequency portion are encoded to obtain the compressed compensation data; wherein the high frequency portion is After i*i pixels are divided into a plurality of blocks, the blocks are subjected to classification sampling to encode the high frequency portion, where i is an integer greater than 1. The method for compressing compensation data of an OLED display panel according to claim 1, further comprising: dividing the compensation data into the blocks according to i*i pixels before converting the compensation data; The compensation data includes a plurality of compensation values corresponding to the respective pixel points. The method for compressing compensation data of an OLED display panel according to claim 1, wherein the compensation data is converted into the low frequency portion, and the high frequency portion and the high frequency portion comprise: Performing an Outlier statistic on the compensation data to obtain the HF portion; deducting the HF portion from the compensation data and performing a Mean Filter process to obtain the low frequency portion; The compensation data subtracts the extremely high frequency portion and the low frequency portion to obtain the high frequency portion. The method for compressing compensation data of an OLED display panel according to claim 2, wherein converting the compensation data into the extremely high frequency portion comprises: calculating a difference value corresponding to each of the pixel points, wherein the The difference value is the difference between the corresponding compensation value of the pixel and the average value of the compensation values of the other pixels in the block where the corresponding pixel is located; the same column will be located The j pixels corresponding to the largest j difference values among the difference values in the blocks are defined as j outliers, where j is a positive integer; and the extremely high frequency portion is caused by the outliers The compensation values are composed of a plurality of positions corresponding to the outliers on the OLED display panel. The method for compressing compensation data of an OLED display panel according to claim 4, wherein converting the compensation data into the low frequency portion comprises: The pixels that are not defined as the outliers are defined as a plurality of non-outliers; and a corresponding low frequency value is calculated for each of the pixels, wherein the low frequency value is corresponding to the pixel point The average value of the compensation values of the non-outliers included in the block; and the low frequency portion is corresponding to the low frequency values corresponding to the pixels and the pixels are located on the OLED display panel The corresponding positions are composed of the respective positions. The method for compressing compensation data of an OLED display panel according to claim 4, wherein the encoding the extremely high frequency portion comprises: the compensation values for the outliers and the outliers are displayed on the OLED The positions corresponding to the panels are encoded. The method for compressing compensation data of an OLED display panel according to claim 5, wherein the encoding the low frequency portion comprises: respectively, the low frequency values corresponding to the pixel points and the pixel points on the OLED display panel The corresponding positions are respectively subjected to an equidistant sampling or a non-equidistant sampling, and the sampling result is encoded. The method for compressing compensation data of an OLED display panel according to claim 1, wherein the encoding the high frequency portion comprises: dividing the high frequency portion into the plurality of pixels according to the i*i pixel points, The blocks are classified to classify the complex array data type; statistics are performed to find the k-group data types with the largest number of the blocks compared to the data types, where k is a positive integer; The group data type is index-encoded to obtain a corresponding k-pen index value; the data type corresponding to each of the blocks is found to be obtained, thereby obtaining the index value corresponding to each of the blocks; and encoding the The data types corresponding to the blocks and the index values. The method for compressing compensation data of an OLED display panel according to claim 8, wherein the method for finding the data type corresponding to the block is: calculating a complex number of the block and the data types respectively. Sum of Absolute Differences (SAD); and the data type corresponding to the smallest of the absolute errors is the data type corresponding to the block. The method for compressing compensation data of an OLED display panel according to claim 1, further comprising: storing the compressed compensation data in a storage unit of the OLED display panel.