TWI712025B - Driving method for pixel circuit - Google Patents

Abstract

A driving method for pixel circuit includes the following steps of: selecting one or more target pixel unit, selecting a first region adjacent to the one or more target pixel unit, which the first region includes a plurality of first region pixel units; turning on a part of the first region pixel units according to a first ratio; selecting a second region adjacent to the first region, which the second region includes a plurality of second region pixel units; and turning on a part of the second region pixel units according to a second ratio, which the second ratio is smaller than the first ratio.

Description

Pixel circuit driving method

This case is related to a driving method, and particularly to a driving method of a pixel circuit.

Generally speaking, the lower layer of the prior art double-layer liquid crystal display is the backlight plate, the middle layer is the first liquid crystal layer (such as shutter cell), and the upper layer is the second liquid crystal layer (such as the display cell). . The current practice is to control the gray scale value of the first liquid crystal layer when the contrast of a certain pixel is to be controlled. For example, the gray scale value is increased from the inside out to produce a ring-shaped progressive gray scale control.

Please refer to Figures 1A-1C, which illustrate the control method of a two-layer liquid crystal display in the prior art and a schematic diagram of causing a display blind spot. As shown in FIGS. 1A-1B, the light valve layer 110 is used to adjust the contrast of the image (for example, relative to the position of the pixel 121 in the display layer 120), so that the image presented by the user on the display is adjusted for contrast. In fact, such a circular grayscale adjustment method will cause grayscale inversion. As shown in Figure 1C, when the user watches the screen of the monitor at the position P2, although the normal displayed image can be seen, when the user is at the position When P1 is watching the screen of the display, due to the gray-scale inversion of the light valve layer 110, the user moves to some squint positions, and the image seen may be broken or incomplete.

Please refer to FIGS. 2A-2C, which illustrate another control method of a two-layer liquid crystal display in the prior art and a schematic diagram of the display result thereof. As shown in FIG. 2A, the image 200 is a picture including a white cross. To illustrate how the prior art processes the contrast of the image 200 and the display result after processing the contrast, consider a part of the image 200, such as the image range 210. As shown in FIG. 2B, the image range 210 shows a schematic diagram of the light valve layer 110 controlling the grayscale value. In the image range 210, the middle image area 211 has the lowest grayscale value, and the grayscale value gradually increases from the inside to the outside. After adjusting the grayscale value, as described above, the image screen viewed by the user may be broken or incomplete due to the grayscale inversion problem, as shown in Figure 2C.

In view of this, how to solve the defect of grayscale inversion has become an urgent technical problem in this field.

The content of the invention aims to provide a simplified summary of the content of this disclosure, so that readers have a basic understanding of the content of this case. This content of the invention is not a complete summary of the content of the present disclosure, and its intention is not to point out the important/key elements of the embodiments of the present case or to define the scope of the present case.

According to an embodiment of the present application, a method for driving a pixel circuit is disclosed, wherein the pixel circuit includes a plurality of pixel units, and the The driving method includes: selecting one or more target pixel units of the pixel units; selecting a first area adjacent to the one or more target pixel units, wherein the first area includes a plurality of first areas Pixel unit; the first area pixel units of the conductive portion according to a first ratio; select a second area adjacent to the first area, wherein the second area includes a plurality of second area pixel units; And the second area pixel units of the conductive portion according to a second ratio, wherein the second ratio is smaller than the first ratio.

110: Light valve layer

120: display layer

200: image

210: Image range

211: Image area

310: Light valve layer

320: display layer

330: Backlight board

340: diffuser

501: target pixel unit

510, 520, 530, 540, 550: area

521, 531: pixel unit

601: target pixel unit

610, 620, 630: area

621, 631: pixel unit

680: Image

681, 683, 685, 687: area

S410~S460: steps

P1, P2: location

When the following detailed description is read in conjunction with the accompanying drawings, it will help to better understand the aspect of the present disclosure. It should be noted that, in accordance with the practical requirements of the description, the features in the diagram are not necessarily drawn to scale. In fact, for the purpose of clarity, the size of each feature may be increased or decreased arbitrarily.

Figures 1A-1C show a control method of a two-layer liquid crystal display in the prior art and a schematic diagram of causing a display blind spot.

2A-2C are schematic diagrams showing another control method of a two-layer liquid crystal display in the prior art and its display result.

Fig. 3 is a schematic structural diagram of a liquid crystal double-layer display according to some embodiments of the present application.

FIG. 4 shows a flowchart of a pixel circuit driving method according to some embodiments of the present application.

Figure 5 shows some embodiments according to this case, in the pixel circuit A schematic diagram of selecting one or more target pixels and performing driving processing around the target pixels.

FIGS. 6A-6B show schematic diagrams of driving processing around the target pixel and its display results according to other embodiments of the present invention.

The following disclosure provides many different embodiments or examples in order to implement different features of the case. Specific embodiments of elements and arrangements are described below to simplify the case. Of course, these examples are only illustrative and not intended to be limiting. For example, the terms "first" and "second" used to describe elements in this case are only used to distinguish the same or similar elements or operations. The terms are not used to limit the technical elements of the case, nor are they used to Limit the order or sequence of operations. In addition, in this case, component symbols and/or letters may be repeated in each example, and the same technical term may use the same and/or different component symbols in each embodiment. This repetition is for the purpose of conciseness and clarity, and does not in itself indicate the relationship between the various embodiments and/or configurations discussed.

Please refer to FIG. 3, which is a schematic structural diagram of a liquid crystal double-layer display according to some embodiments of the present application. As shown in Figure 3, the structure of the liquid crystal double-layer display includes a backlight unit (BLU) 330, a shutter cell 310, a display unit 320, and a diffuser from bottom to top. ) 340. In some embodiments, the light valve layer 310 and the display layer 320 are liquid crystal display circuits. It is worth mentioning that Figure 3 shows a schematic diagram of the structure. The field of the present invention has Generally knowledgeable persons should know that the light valve layer 310 and the display layer 320 are respectively connected to the control line and the data line to control the conduction of the pixel circuits of the light valve layer 310 and the display layer 320, as well as the display layer 320 and the diffuser. 340. The actual circuit connection relationship between the light valve layer 310 and the backlight plate 330, so these connection methods are not specifically described in this article.

This article will explain that, under the control of the pixel circuit driving method of this case, the liquid crystal double-layer display will not be affected by the aforementioned grayscale when the user views the viewing angle at any position in front of the display layer 320. The problem of level reversal causes the user to see a disconnected or broken screen.

Please refer to FIG. 4, which illustrates a flowchart of a pixel circuit driving method according to some embodiments of the present application. The pixel circuit includes a plurality of pixel units. In some embodiments, the driving method is used to control the pixel circuit of the light valve layer 310 of the liquid crystal double-layer display shown in FIG. 3.

For the description of the driving method below, please refer to Figs. 4 and 5. Fig. 5 shows that in some embodiments of the present case, one or more target pixel units are selected in the pixel circuit, and the target picture A schematic diagram of the driving process of the surrounding cells of a pixel cell.

It is worth mentioning that the pixel unit in FIG. 5 refers to the pixel unit of the light valve layer 310 in FIG. 3. The following describes the conduction or non-conduction of the pixel unit, etc., and refers to the control of the pixel unit of the light valve layer 310.

In step S410, one or more target pixel units are selected from a plurality of pixel units.

In some embodiments, in the process of image processing, for example, each pixel unit of the pixel circuit needs to go through the driving method of this application. This case is not limited to processing for one target pixel unit at a time (dot processing), or processing for multiple target pixel units at a time (linear processing). As shown in FIG. 5, among a plurality of pixel units, a target pixel unit 501 is selected.

In step S420, it is determined whether the grayscale value of one or more target pixel units is greater than the threshold value.

In some embodiments, the purpose of judging the grayscale value of the target pixel unit is that if the grayscale value of the pixel unit is too small, the magnitude or benefit of the contrast adjustment can be small. For example, each pixel unit is used to display a gray scale value between 0 and 255, and the threshold value is set to a gray scale value of 100. If the grayscale value of the target pixel unit 501 is 50, the subsequent driving method is not executed, and the process returns to step S410 to select other target pixel units. If the grayscale value of the target pixel unit 501 is 150, step S430 is executed. It is worth mentioning that the threshold value of this case is not limited to the value of 100. For those of ordinary knowledge in the technical field, different threshold values can be designed according to actual conditions to meet current needs.

In some embodiments, the grayscale value of the target pixel unit in step S420 refers to the grayscale value of a certain pixel of the image data to be processed, and the coordinate position of this pixel corresponds to the target The coordinate position of the pixel unit.

In step S430, a first area adjacent to one or more target pixel units is selected.

In some embodiments, as shown in FIG. 5, the first area 510 is all the pixel units around the target pixel unit 501, so that the target pixel unit 501 and all the pixel units of the first area 510 (for example, 8 The pixel units are adjacent to each other in a ring shape. In other words, the first area 510 is a ring-shaped area surrounding the outside of the target pixel unit 501.

In step S440, the pixel units in the first area 510 are turned on according to the first ratio.

In some embodiments, the first ratio may be 100%. For example, in the pixel units of the light valve layer 310 (as shown in FIG. 3), the positions of the 8 pixel units corresponding to the first region 510 are all turned on.

In step S450, the second area 520 adjacent to the first area 510 is selected.

In some embodiments, the second area 520 is all the pixel units around the first area 510, so that all the pixel units (for example, 16 pixel units) of the first area 510 and the second area 520 are circularly adjacent. In other words, the second area 520 is an annular area surrounding the outside of the first area 510.

In step S460, the pixel units in the second area 520 are turned on according to the second ratio.

In some embodiments, the second ratio is less than the first ratio. For example, the second ratio may be 50%. Among the pixel units of the light valve layer 310 (as shown in Figure 3), among the 16 pixel units corresponding to the second area 520, one of two will be turned on, while the other will not Will be turned on.

By analogy, the driving method of the pixel circuit in this case can design the number of areas according to actual needs. The above steps S410 to S460 illustrate the two adjacent regions and the two corresponding conduction ratios, so as to achieve the effect of solving the grayscale inversion problem and improving the contrast.

In some embodiments, the driving method of the pixel circuit in this case provides five adjacent regions for description, and the steps are similar to steps S450 to S460 in FIG. 4.

In some embodiments, as shown in FIG. 5, the third area 530 adjacent to the second area 520 is selected. The third area 530 is all the pixel units around the second area 520, so that all the pixel units (for example, 24 pixel units) of the second area 520 and the third area 530 are circularly adjacent. In other words, the second area 520 is an annular area surrounding the outside of the first area 510.

Next, the pixel units of the third region 530 of the portion are turned on according to the third ratio. In some embodiments, the third ratio is less than the second ratio. For example, the third ratio may be 33.3%. For example, in the pixel unit of the light valve layer 310 (as shown in FIG. 3), among the 24 pixel units corresponding to the second region 520, one of the three pixels will be turned on, and The two will not be turned on.

Similarly, the fourth area 540 adjacent to the third area 530 is selected. The fourth area 540 is all the pixel units around the third area 530, so that all the pixel units (for example, 32 pixel units) of the third area 530 and the fourth area 540 are circularly adjacent. In other words, the fourth area 530 It is an annular area surrounding the third area 530.

Next, the pixel unit of the fourth area 540 of the portion is turned on according to the fourth ratio. In some embodiments, the fourth ratio is less than the third ratio. For example, the fourth ratio may be 25%. In the pixel unit of the light valve layer 310 (as shown in Figure 3), among the 32 pixel units corresponding to the fourth area 540, one of the four pixels will be turned on, while three will not Is turned on.

Similarly, the fifth area 550 adjacent to the fourth area 540 is selected. The fifth area 550 is all the pixel units around the fourth area 540, so that all the pixel units (for example, 40 pixel units) of the fourth area 540 and the fifth area 550 are circularly adjacent. In other words, the fifth area 540 is an annular area surrounding the outside of the fourth area 540.

Next, the pixel unit of the fifth area 550 of the portion is turned on according to the fifth ratio. In some embodiments, the fifth ratio is less than the fourth ratio. For example, the fifth ratio may be 20%. In the pixel unit of the light valve layer 310 (as shown in Figure 3), among the positions of the 40 pixel units corresponding to the fifth area 550, one of the five pixels will be turned on, while the four will not Is turned on.

In some embodiments, in each region, between the pixel units that are turned on, there are substantially the same interval of pixel units that are not turned on. For example, as shown in Figure 5, the second ratio is 50%. Therefore, in the second area 520, the pixel unit is turned on-the pixel unit is not turned on-the pixel unit is turned on -... Arranged equally. For another example, the third ratio is 33.3%, so in the third area 530, it is turned on Pixel units-non-conducted pixel units-non-conducted pixel units-conducted pixel units-...and so on. By analogy, the more peripheral area, the smaller the ratio, the fewer pixel units are turned on, and the more pixel units are not turned on.

In some embodiments, before determining which pixel unit in the peripheral area is to be turned on, the pixel unit that is not turned on in the inner area is first searched, so that at least one of the pixel units in the peripheral area is turned on , Will be adjacent to the non-conductive pixel units in the inner surrounding area. For example, as shown in FIG. 5, before the first pixel unit is turned on in the third area 530, the pixel unit that is not turned on in the second area 520 is searched for.

Then, only the pixel unit adjacent to the non-conducted pixel unit of the second area 520 in the third area 530 will be selected as the first pixel unit of the third area 530 to be switched on. For example, the pixel unit 531 of the third area 530 is adjacent to the non-conductive pixel unit 521 of the second area 520. Therefore, the pixel unit 531 of the third area 530 will be regarded as the first pixel unit to be turned on. Then, the pixel units in the third area 530 will be turned on according to the third ratio and the first turned-on pixel unit, for example, in counterclockwise order or clockwise order based on the first turned-on pixel unit, separated by two After a non-conductive pixel unit, turn on other pixel units. In this way, the pixel units of the third region 530 that are turned on and the pixel units of the third region 530 that are not turned on are sequentially arranged in a third ratio.

In other embodiments, the driving method in this case will first search for the pixel unit in the inner area to determine the first pixel unit in the outer area. The pixel unit that will not be turned on. In this way, at least one of the non-conductive pixel units in the peripheral area will be adjacent to the conductive pixel units in the inner peripheral area. Similar to the foregoing description, the pixel units of the third area 530 will be turned on according to the third ratio and the first non-conductive pixel unit, for example, counterclockwise or clockwise based on the first non-conductive pixel unit In order, after another non-conductive pixel unit (that is, two pixel units are not connected), the other pixel units are turned on, so that the pixel unit of the third region 530 that is turned on and the pixel unit that is not turned on Arrange in order in the third proportion.

This case provides driving methods for pixel circuits of other embodiments. Please refer to FIGS. 6A-6B, which illustrate a schematic diagram of the driving process around the target pixel and the display result according to other embodiments of the present case. Compared with the adjacent area in Fig. 5, which is a square ring-shaped area, the pixel unit is turned on or off. In Fig. 6A, a long area is used to determine whether the pixel unit is turned on. Please refer to Figure 4 and Figure 6A for the following description.

In step S410, the target pixel unit 601 is selected. In this embodiment, multiple target pixel units 601 are selected to make the target area appear as a long area.

In step S420, it is determined whether the grayscale value of the target pixel unit 601 is greater than the threshold value. For ordinary knowledgeable persons, the result of step S420 can be designed to determine "Yes" according to actual needs. For example, the grayscale value of all target pixel units 601 is required to be greater than the threshold value, or as long as there is one target pixel unit The gray scale value of 601 is greater than the threshold value, etc., this The case is not limited to this.

In step S430, the first area 610 adjacent to the target pixel unit 601 is selected. Similarly, the first area 610 is a long area.

In step S440, the pixel units in the first area 610 are turned on according to the first ratio. In some embodiments, the first ratio is 100%, that is, all pixel units in the first area 610 will be turned on.

In step S450, the second area 620 adjacent to the first area 610 is selected. Similarly, the second area 620 is a long area.

In step S460, the pixel units in the second area 620 are turned on according to the second ratio. In some embodiments, the second ratio is 50%, that is, half of the pixel units in the second area 620 will be turned on. In addition, as described in FIG. 5 above, the pixel units that are turned on and the pixel units that are not turned on in the second region 620 are evenly distributed, for example, the pixel units are turned on with an interval of one pixel unit.

It is worth mentioning that the processing method of the third area 630 in Fig. 6A is similar to the execution of steps S450 to S460 in the aforementioned Fig. 5, so it will not be repeated here.

In some embodiments, only the pixel unit adjacent to the non-conductive pixel unit of the second region 620 in the third region 630 will be selected as the first pixel unit of the third region 630 to be turned on . For example, the pixel unit 631 of the third region 630 is adjacent to the non-conductive pixel unit 621 of the second region 620. Therefore, the pixel unit 631 of the third area 630 will be regarded as the first pixel unit to be turned on. Then, the pixel units in the third area 630 will be turned on according to the third ratio and the first The pixel unit is turned on, for example, in the up and down order based on the first pixel unit that is turned on, after two non-conductive pixel units are separated, the other pixel units are turned on. In this way, the pixel units of the third region 630 that are turned on and the pixel units of the third region 630 that are not turned on are sequentially arranged in a third ratio.

In other embodiments, the driving method of the present application first searches for the pixel unit in the inner surrounding area to be turned on, to determine the first pixel unit in the outer area that will not be turned on. In this way, at least one of the non-conductive pixel units in the peripheral area will be adjacent to the conductive pixel units in the inner peripheral area. Similar to the foregoing description, the pixel units of the third area 630 will be turned on according to the third ratio and the first non-conductive pixel unit, for example, the upper and lower order based on the first non-conductive pixel unit, and one more interval After the non-conductive pixel unit (that is, the two pixel units are not connected), the other pixel units are turned on, so that the pixel units in the third region 630 that are turned on and the pixel units that are not turned on are in a third ratio. Arranged sequentially.

In some embodiments, after executing the driving method of the pixel circuit, as shown in the result image 680 shown in FIG. 6B, the central area 681 is from the inside to the outside, such as areas 683, 685, and 687, gradually reducing the number of pixels turned on Unit to make the overall display softer.

To sum up, the driving method of the pixel circuit provided in this case adjusts the ratio of pixel units to be turned on, gradually reduces the number of turned-on pixel units from the inside out, and evenly distributes the array of turned-on pixel units. In addition to solving the technical problems of grayscale inversion that occurred in the past In addition, it can also achieve the effect of gradual brightness.

The above content summarizes the features of several embodiments, so that those familiar with the technology can better understand the aspect of the case. Those familiar with this technology should understand that without departing from the spirit and scope of the case, the above content can be easily used as a basis for design or modification for other changes in order to implement the same purpose and/or realization of the embodiments introduced in this article Same advantage. The above content should be understood as an example of this case, and the scope of protection should be subject to the scope of the patent application.

S410~S460‧‧‧Step

Claims (10)

A driving method of a pixel circuit, wherein the pixel circuit includes a plurality of pixel units, wherein the driving method includes: Select one or more target pixel units of the pixel units; Selecting a first area adjacent to the one or more target pixel units, where the first area includes a plurality of first area pixel units; The first area pixel units of the conductive portion according to a first ratio; Selecting a second area adjacent to the first area, where the second area includes a plurality of second area pixel units; and The pixel units of the second area are turned on according to a second ratio, wherein the second ratio is smaller than the first ratio. The driving method described in claim 1, further including: Selecting a third area adjacent to the second area, where the third area includes a plurality of third area pixel units; and The pixel units of the third area are turned on according to a third ratio, wherein the third ratio is smaller than the second ratio. The driving method described in claim 1, further including: After selecting the one or more target pixel units of the pixel units, it is determined whether a gray scale value of the one or more target pixel units is large At a threshold; and When it is determined that the grayscale value of the one or more target pixel units is greater than the threshold value, a portion of the pixel units is turned on. The driving method according to claim 1, wherein the second area pixel units of the second ratio are turned on at intervals in the second area. The driving method according to claim 2, wherein the pixel units of the third area of the third ratio are turned on at intervals in the third area. The driving method according to claim 2, wherein the first area, the second area, and the third area are an annular area or a long area. The driving method according to claim 1, wherein the first area is circularly adjacent or linearly adjacent to the one or more target pixel units, and the second area is circularly adjacent or linearly adjacent to the first One area. The driving method according to claim 1, wherein the first ratio is 100%, and the second ratio is 50%. The driving method described in claim 2 further includes: Selecting a non-conducted pixel unit among the pixel units in the second region; Conducting a pixel unit adjacent to the non-conducting pixel unit among the pixel units in the third region; and The pixel units of the third area are turned on according to the third ratio. The driving method described in claim 2 further includes: Selecting one of the pixel units in the second area; A pixel unit adjacent to the conductive pixel unit is not conducted in the pixel units of the third region; and The pixel units of the third area are turned on according to the third ratio.

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