TWI772036B - Information storage method - Google Patents

Abstract

An information storage method is used to store a previous frame of image by using line segment characteristics during over-driving. The information storage method includes the following steps of: (a) performing line segment information statistics on an input image data; and (b) storing the line segment characteristics of the input image data as a line segment packet, wherein each of the plurality of display lines included in the display panel can store a plurality of line segment packets to achieve the compression effect.

Description

Information storage method

The present invention relates to a display device, and more particularly, to an information storage method applied to the display device.

Generally speaking, if the response time required by the display panel is long, once its gray scale changes, its brightness cannot be immediately increased to the target brightness due to insufficient response time, resulting in residual images that are prone to appear when the display screen changes.

For example, for an OLED (Organic Light-Emitting Diode, OLED) display panel, when it switches from a low grayscale to a high grayscale, the phenomenon of insufficient brightness increase occurs, resulting in image retention; conversely, when the Others have insufficient degradation when switching from high grayscale to low grayscale, which also leads to image retention.

In order to improve the above shortcomings, the over-drive technology is usually adopted. residue.

However, in this method, the output voltage is compensated by obtaining the compensation gray scale from the look-up table according to the current image and the previous frame image, so it is necessary to record the data of the previous frame image as a reference. However, the amount of data is too large, and it is necessary to use, for example, Block Truncation coding (BTC) technology to perform image compression on it. BTC image compression technology is to truncate the block as a unit to achieve the purpose of compressing and maintaining the image characteristics. Compression ratio.

However, the BTC image compression technology still has the following shortcomings, which need to be improved:

(1) Since it will destroy the details of the image, some points with large differences in brightness in the block will have a large error with the restoration result, resulting in over-compensation or under-compensation; and

(2) Its compression rate is not large enough and it is less elastic in use.

In view of this, the present invention proposes a data storage method to effectively solve the above-mentioned problems encountered in the prior art.

One embodiment of the present invention is a data storage method. In this embodiment, the information storage method is used to store the previous frame image by using the line segment feature during overdriving. The information storage method includes the following steps: (a) performing line segment information statistics on the input image data; and (b) storing the line segment features of the input image data as a line segment packet, wherein each of the plurality of display lines included in the display panel is displayed Lines can store multiple line segment packets for compression.

In one embodiment, step (a) includes: (a1) determining whether a pixel of the input image data is the same line segment; and (a2) if the determination result of step (a1) is yes, then entering the next pixel .

In one embodiment, the step (a) further includes: (a3) if the judgment result of the step (a1) is no, then judging whether the current line segment length has met the line segment length condition; and (a4) if the step (a3) If the judgment result is no, then go to the next pixel.

In one embodiment, step (a) further includes: (a5) if the judgment result of step (a3) is yes, then judging whether there is still storage space at present; and (a6) if the judgment result of step (a5) is no , then go to the next pixel.

In one embodiment, the step (a) further includes: (a7) if the determination result of the step (a5) is yes, storing the line segment packet.

In one embodiment, step (a1) is to determine whether the pixels are the same line segment according to the grayscale value of the pixel and the grayscale oscillation threshold.

In one embodiment, the setting of the line segment length condition is used to prevent characters/complex patterns from occupying a limited number of line segments.

In one embodiment, step (a3) determines whether the current line length has met the line length condition according to the line segment length threshold.

In one embodiment, the line segment packet may include line segment features such as grayscale, start point, and end point.

In an embodiment, step (a5) is to determine whether there is still storage space currently according to the number of segment packets that can be stored in each display line.

In one embodiment, the information storage method further includes: comparing the current frame image with the previous frame image and performing compensation through the intersection of the line segment between the current frame image and the previous frame image to avoid text/complex pattern compensation.

In one embodiment, the current frame image and the previous frame image can be compared according to the lookup table.

Compared with the prior art, the information storage method of the present invention utilizes the line segment information to record the information of the previous frame image during overdriving, so as to achieve a higher compression rate and effectively reduce the required storage space. In addition, the information storage method of the present invention can also filter the area of interest and record it according to actual needs, and it is more flexible than the traditional BTC technology in actual use.

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

Since the traditional BTC technology is easily over-compensated or under-compensated, the compression ratio is not large enough, and the use is less flexible during overdrive, the present invention provides an information storage method, which is used during overdrive. The line segment information is used to record the information of the previous frame image, so as to achieve a higher compression rate and effectively reduce the required storage space (such as memory) size, and it can also filter the area of interest and record it according to actual needs. Therefore, it is more flexible than the traditional BTC technology in use.

One embodiment of the present invention is a data storage method. In this embodiment, the information storage method of the present invention is used to store the previous frame image by using the line segment feature during overdriving. In detail, the information storage method of the present invention records the line segment of each line to reduce the required storage space, and separates the area to be compensated and the non-compensated area by restricting the recorded line segment to reduce distortion caused by compression And cause the phenomenon of reverse compensation or discontinuity, and the higher the compression rate can be achieved under the simpler the picture.

Generally speaking, an image can be regarded as a combination of a plurality of lines, and each line can be regarded as a combination of a plurality of line segments with different grayscales, and these line segments are also composed of a plurality of same grayscales. A combination of pixel levels. Therefore, these image data can be recorded as line segment information by using these pixels with the same gray level and consecutively arranged, and the number of recorded line segments will directly affect the degree of image compression and distortion.

When the content of the display screen is relatively simple, the data of one line changes less, and only a few line segments can be used to represent the line, so less memory space is required. If the display screen is more complicated, more information can be recorded by increasing the number of recorded line segments. A line in this picture can also be divided into a combination of many line segments. By restricting the conditions for storing line segments, only the region of interest data can be stored to reduce data access that does not require compensation.

Please refer to FIG. 1 . FIG. 1 is a flowchart of the information storage method in this embodiment. As shown in FIG. 1 , the information storage method in this embodiment may include the following steps:

Step S10: performing line segment information statistics on the input image data; and

Step S12: Store the line segment features of the input image data as line segment packets, wherein each display line of the plurality of display lines included in the display panel can store a plurality of line segment packets to achieve a compression effect.

Please refer to FIG. 2. FIG. 2 is a flowchart of an information storage method according to another embodiment of the present invention. As shown in FIG. 2, the information storage method in this embodiment may include the following steps:

Step S20: Determine whether the current pixels are the same line segment?

If the judgment result of step S20 is no, then execute step S22: end line segment information statistics, and judge whether the length conforms to the line segment?

If the judgment result of step S20 is yes, then execute step S24: enter the next pixel, and continue to count the line segment information;

If the judgment result of step S22 is yes, then go to step S26: judge whether there is still storage space?

If the judgment result of step S22 is no, then execute step S28: enter the next pixel, and re-statistic the line segment information;

If the judgment result of step S26 is no, then execute step S28: enter the next pixel, and re-statistic the line segment information; and

If the determination result of step S26 is yes, step S29 is executed: the line segment packet is stored.

Please refer to FIG. 3 , which is a functional block diagram of the processing circuit 3 applied to the information storage method. As shown in FIG. 3 , the processing circuit 3 includes a data input unit DI, a line segment information statistics unit SI, a current image line packing unit CI, a previous image line packing unit PI, and a look-up table LUT. The data input unit DI is coupled to the line segment information statistics unit SI. The line segment information statistics unit SI is coupled to the current image line packet unit CI. The current image line packing unit CI is respectively coupled to the previous image line packing unit PI and the look-up table LUT. The previous image line packet unit PI is coupled to the look-up table LUT. The data input unit DI receives the image data and transmits it to the line segment information statistics unit SI. The line segment information statistics unit SI performs line segment information statistics on the image data, and then transmits the statistics to the current image line packet unit CI to provide the current image line packet. The previous image line packet unit PI provides the previous image line packet. According to the current image line packet and the previous image line packet, corresponding compensation information is obtained according to the lookup table LUT for compensation.

Since the present invention stores line segment features as line segment packets, each line can store a plurality of line segment packets, so as to achieve the compression effect. For example, as shown in FIG. 4 , the line segment packet PK may include line segment feature information such as gray level GL, start point SP, and end point EP, but is not limited thereto.

It should be noted that the present invention can flexibly adjust the compression degree that can be achieved by changing the number of line segment packets that each line can record. Taking a display panel with a resolution (1080x2160) as an example, if each line can record 50 line segment packets for red R/green G/blue B, it can achieve a compression rate of about 4 times, which is approximately 9.3Mbit. To record pictures; if each line can record 20 line segment packets for red R/green G/blue B, it can achieve about 10 times the compression rate, which is approximately 4.1Mbit for recording pictures.

In practical applications, in order to avoid characters/complex patterns occupying a limited number of line segment packets, the present invention can also set a line segment length condition to determine whether to record the line segment packets. For example, the present invention can determine whether to record the current line segment length according to the line segment length thresholds (such as the lower limit of record length and the upper limit of record length), but not limited to this.

As shown in Figure 5, when the length of the line segment does not exceed the lower limit of recording length LL, it means that it is located in the non-recording area NR, so it does not meet the line length condition set by the present invention and is not recorded; when the length of the line segment exceeds the lower limit of recording length LL And when it does not exceed the upper limit of recording length UL, it means that it is located in the recording area RC, so it is recorded in accordance with the line segment length conditions set by the present invention; when the current line segment length exceeds the upper limit of recording length UL, it means that it is located in the recording area and is not recorded. area NR, so it does not meet the line segment length condition set by the present invention and is not recorded. In this way, only line segment packets that meet the line segment length condition set by the present invention will be stored, so the required memory space can be greatly reduced.

In practical applications, step S20 in FIG. 2 can determine whether it is the same line segment according to the grayscale value of the current pixel and the allowable grayscale oscillation threshold (such as the upper grayscale oscillation limit and the lower grayscale oscillation limit) of the same line segment. , so the points with slight grayscale differences can be judged as the same line segment with the same grayscale, and the setting can accept information modification caused by other factors such as screen stretching, but not limited thereto.

As shown in FIG. 6 , assuming that the upper and lower horizontal dotted lines represent the upper and lower gray-scale oscillation limits GT1 and the lower gray-scale oscillation limit GT2 that can be tolerated in the same line segment, the current seven consecutive gray-scale values of the pixel from left to right in the horizontal direction are all It is located between the gray-scale oscillation upper limit GT1 and the gray-scale oscillation lower limit GT2 on the same line segment, so it can be judged that it should belong to the same line segment; as for the next gray-scale value, it is located below the gray-scale oscillation lower limit GT2, which means that it belongs to the same line segment. It is not located between the gray-scale oscillation upper limit GT1 and the gray-scale oscillation lower limit GT2 for the same line segment, which is obviously different from the previous seven consecutive gray-scale values, so it can be determined as the start of the next line segment.

Please refer to FIG. 7 , which is a schematic diagram illustrating the number of line segment packets recorded by each line. As shown in FIG. 7 , taking line m as an example, it can record n line segment packets for red R, green G and blue B respectively, that is, packet 1 to packet n, where m and n are both positive integers, but not This is the limit.

Please refer to FIG. 8 and FIG. 9 . FIG. 8 and FIG. 9 are schematic diagrams of determining the compensation area. In order to avoid text/complex pattern compensation, the present invention can compensate for the intersection of line segments of the previous and subsequent frame images, such as compensation for the overlapping area OV of the previous image packet PK1 and the current image packet PK2, but not limited thereto. In practical applications, the front and rear frame images may include patterns, lines and/or characters, and there is no specific limitation.

Compared with the prior art, the information storage method of the present invention utilizes line segment information to record the information of the previous frame of image during overdriving, so as to effectively reduce the required storage space and achieve a higher compression rate. In addition, the information storage method of the present invention can also filter the area of interest and record it according to actual needs, and it is more flexible than the traditional BTC technology in actual use.

S10: Steps S12: Steps S20: Steps S22: Step S24: Step S26: Step S28: Steps S29: Steps 3: Processing circuit DI: data input unit SI: Line Segment Information Statistics Unit CI: Current Image Line Packet Unit PI: previous image line packet unit LUT: Lookup Table PK: line segment packet GL: Grayscale SP: starting point EP: End Point NR: no recording area RC: Recording area LL: record length lower limit UL: record length upper limit GT1: Grayscale shock upper limit GT2: Grayscale shock lower limit R: red G: green B: blue PK1: previous image packet PK2: Current image packet OV: overlapping area

The accompanying drawings of the present invention are described as follows: FIG. 1 is a flowchart of an information storage method according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating an information storage method according to another embodiment of the present invention. FIG. 3 is a functional block diagram of a processing circuit applied to the information storage method. FIG. 4 is a schematic diagram of a line segment packet. FIG. 5 is a schematic diagram of determining whether to record a line segment according to a line segment length threshold. FIG. 6 is a schematic diagram illustrating whether the same line segment is determined according to the grayscale value of the pixel and the grayscale oscillation threshold. FIG. 7 is a schematic diagram illustrating the number of line segment packets recorded by each line. FIG. 8 and FIG. 9 are schematic diagrams of determining the compensation area.

S10: Steps

S12: Steps

Claims (12)

An information storage method for storing a previous frame image by using line segment characteristics during over-drive, comprising the following steps: (a) performing line segment information statistics on an input image data; and (b) the input image data The line segment features of the image data are stored as line segment packets (Packet), wherein each display line of a plurality of display lines included in a display panel can store a plurality of line segment packets to achieve a compression effect. The information storage method according to claim 1, wherein step (a) comprises: (a1) judging whether one pixel of the input image data is the same line segment; and (a2) if the judgment result of step (a1) is yes, Then go to the next pixel and continue to count the line segment information. The information storage method according to claim 2, wherein step (a) further comprises: (a3) if the judgment result of step (a1) is no, then judging whether the current line segment length has met the line segment length condition; and (a4) ) If the judgment result of step (a3) is no, enter the next pixel, and re-statistic the line segment information. The information storage method according to claim 3, wherein step (a) further comprises: (a5) if the judgment result of step (a3) is yes, then judging whether there is still storage space at present; and (a6) if step (a5) ), the judgment result is no, then enter the next pixel, and re-statistic the line segment information. The information storage method according to claim 4, wherein step (a) further comprises: (a7) If the determination result of step (a5) is yes, storing the line segment packet. The information storage method according to claim 2, wherein step (a1) is to determine whether the pixel is the same line segment according to the grayscale value of the pixel and a grayscale oscillation threshold. The information storage method according to claim 3, wherein the setting of the line segment length condition is used to prevent characters/complex patterns from occupying a limited number of line segments. The information storage method according to claim 3, wherein step (a3) judges whether the current length of the line has met the condition of the length of the line according to the threshold of the length of the line. The information storage method according to claim 1, wherein the line segment packet can include line segment features such as gray scale, start point, and end point. The information storage method according to claim 4, wherein step (a5) is to determine whether there is still storage space currently according to the number of line segment packets that can be stored in each display line. The information storage method according to claim 1, further comprising: comparing the current frame image with the previous frame image, and performing compensation through the intersection of the line segment between the current frame image and the previous frame image, so as to avoid text/complex patterns. compensate. The information storage method of claim 11, wherein the current frame image and the previous frame image can be compared according to a look-up table.

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