CN111489716B - Driving method of pixel circuit - Google Patents
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- CN111489716B CN111489716B CN202010345138.0A CN202010345138A CN111489716B CN 111489716 B CN111489716 B CN 111489716B CN 202010345138 A CN202010345138 A CN 202010345138A CN 111489716 B CN111489716 B CN 111489716B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000010410 layer Substances 0.000 description 35
- 238000010586 diagram Methods 0.000 description 11
- 239000002355 dual-layer Substances 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 10
- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 208000004350 Strabismus Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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- Crystallography & Structural Chemistry (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A driving method of a pixel circuit 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 comprises a plurality of first area pixel units; conducting a portion of the first area pixel units according to a first ratio; selecting a second area adjacent to the first area, wherein the second area comprises a plurality of second area pixel units; and turning on part of the second area pixel units according to a second proportion, wherein the second proportion is smaller than the first proportion.
Description
Technical Field
The present invention relates to a driving method, and more particularly, to a driving method of a pixel circuit.
Background
Generally, the lower layer of the dual-layer lcd of the prior art is a backlight, the middle layer is a first liquid crystal layer (e.g., a light valve layer (shutter cell)), and the upper layer is a second liquid crystal layer (e.g., a display layer (display)). Currently, when the contrast of a certain pixel is to be controlled, the gray scale value of the first liquid crystal layer is controlled, for example, the gray scale value is increased from inside to outside, so as to generate the control of the ring-shaped progressive gray scale.
Referring to fig. 1A-1C, a control method of a dual-layer lcd and a schematic diagram of a dead angle caused by the dead angle are shown. As shown in fig. 1A-1B, the light valve layer 110 is used to adjust the contrast of an image (e.g., relative to the position of the pixels 121 in the display layer 120), so that the image presented on the display when viewed by a user is contrast-adjusted. In fact, such a ring-shaped gray scale adjustment method causes the problem of gray scale inversion. As shown in fig. 1C, although the user can see the normally displayed image when viewing the display at the position P2, when viewing the display at the position P1, the user may move to some squint positions due to the gray level inversion problem of the light valve layer 110, and the viewed image may be broken or defective.
Please refer to fig. 2A-2C, which illustrate another control method of a dual-layer lcd and a schematic diagram of the display result thereof according to the prior art. As shown in fig. 2A, the image 200 is a screen including a white cross. To illustrate how the prior art processes the contrast of the image 200 and the display results after processing the contrast, consider a portion 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 gray scale value. In the image range 210, the image area 211 at the center has the lowest gray scale value, and the gray scale values gradually increase from the inside to the outside. By adjusting the gray scale value, as mentioned above, the image frame viewed by the user may have broken lines or defects due to the gray scale inversion problem, as shown in fig. 2C.
In view of the above, it is an urgent technical problem in the art to solve the gray scale inversion defect.
Disclosure of Invention
According to an embodiment of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit includes a plurality of pixel units, wherein 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 comprises a plurality of first area pixel units; conducting a portion of the first area pixel units according to a first ratio; selecting a second area adjacent to the first area, wherein the second area comprises a plurality of second area pixel units; and turning on part of the second area pixel units according to a second proportion, wherein the second proportion is smaller than the first proportion.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIGS. 1A-1C are schematic diagrams illustrating a control method and a display dead angle of a dual-layer LCD according to the prior art.
Fig. 2A-2C are schematic diagrams illustrating another control method of a dual-layer type liquid crystal display of the related art and a display result thereof.
Fig. 3 shows a schematic structural diagram of a liquid crystal dual layer display according to some embodiments of the present invention.
Fig. 4 shows a flow chart of a driving method of a pixel circuit in some embodiments of the invention.
Fig. 5 is a schematic diagram illustrating one or more target pixels selected from the pixel circuits and driving the periphery of the target pixels according to some embodiments of the invention.
Fig. 6A-6B are schematic diagrams illustrating driving processes performed around a target pixel and display results thereof according to further embodiments of the present invention.
Reference numerals
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 … diffusion plate
501 … target pixel unit
510. 520, 530, 540, 550 … area
521. 531 … pixel circuit
601 … target pixel unit
610. 620, 630 … areas
621. 631 … pixel circuit
680 … image
681. 683, 685 and 687 … region
S410 to S460 … steps
Position P1, P2 …
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
specific embodiments of components and arrangements are described below to simplify the present disclosure. Of course, these examples are merely illustrative and not limiting. For example, the terms "first" and "second" are used herein to describe elements, components, operations, etc. are used only for distinguishing the same or similar elements or operations, and are not used to limit the technical elements, the order or sequence of the operations. Additionally, reference numerals and/or letters may be repeated among the examples herein, and the same terminology may be used with the same and/or different reference numerals for the various embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
Referring to fig. 3, a schematic structural diagram of a liquid crystal dual-layer display according to some embodiments of the invention is shown. As shown in fig. 3, the structure of the lcd dual-layer display includes, from bottom to top, a backlight unit (BLU) 330, a light valve layer (shutter cell)310, a display layer (display) 320, and a diffuser plate (diffuser) 340. In some embodiments, the light valve layer 310 and the display layer 320 are liquid crystal display circuits. It should be noted that fig. 3 is a schematic structural diagram, and it should be understood by those skilled in the art that the light valve layer 310 and the display layer 320 are respectively connected to the control lines and the data lines to control the conduction of the pixel circuits of the light valve layer 310 and the display layer 320 and the actual circuit connection relationship between the display layer 320, the diffusion plate 340, the light valve layer 310 and the backlight plate 330, and therefore, these connection manners are not particularly described herein.
It will be described herein that, under the control of the pixel circuit driving method of the present invention, when a user views a display screen at any position in front of the display layer 320, the dual-layer lcd does not cause the user to see a broken line or a defective picture due to the gray scale inversion problem.
Referring to fig. 4, a flow chart of a driving method of a pixel circuit according to some embodiments of the invention is shown. The pixel circuit comprises a plurality of pixel units. In some embodiments, the driving method is used to control the pixel circuits of the light valve layer 310 of the liquid crystal dual-layer display of fig. 3.
Referring to fig. 4 and 5 together, fig. 5 is a schematic diagram illustrating a driving method for selecting one or more target pixel units in a pixel circuit and driving peripheral units of the target pixel units according to some embodiments of the present invention.
It should be noted that the pixel unit in fig. 5 refers to the pixel unit of the light valve layer 310 in fig. 3. The following description of conduction or non-conduction of the pixel unit refers to control of the pixel unit of the light shutter layer 310. In some embodiments, the pixel cells are turned on bright and turned off dark.
In step S410, one or more target pixel units are selected from the plurality of pixel units.
In some embodiments, each pixel unit of the pixel circuit needs to be driven by the driving method of the present invention during the image processing. The present invention is not limited to processing for one target pixel cell at a time (dotted processing) or processing for a plurality of target pixel cells at a time (linear processing). As shown in fig. 5, a target pixel unit 501 is selected from a plurality of pixel units.
In step S420, it is determined whether the gray-scale value of one or more target pixel units is greater than a threshold value.
In some embodiments, the purpose of determining the gray-scale value of the target pixel unit is to make the contrast ratio adjustable to a smaller extent or benefit if the gray-scale value of the pixel unit is too small. For example, each pixel unit is used for displaying gray scales between 0 and 255, and a threshold value is set to be a gray scale value of 100. If the gray-scale value of the target pixel unit 501 is 50, the subsequent driving method is not performed, and the process returns to step S410 to select another target pixel unit. If the gray-scale value of the target pixel unit 501 is 150, step S430 is performed. It should be noted that the threshold value of the present invention is not limited to 100, and it is obvious to those skilled in the art that various threshold values can be designed according to the actual situation to meet the current demand.
In some embodiments, the gray-scale value of the target pixel unit in step S420 is a gray-scale value of a pixel in the image data to be processed, and the coordinate position of the pixel corresponds to the coordinate position of the target pixel unit.
In step S430, a first region adjacent to one or more target pixel units is selected.
In some embodiments, as shown in fig. 5, the first region 510 is all pixel units around the target pixel unit 501, such that the target pixel unit 501 is annularly adjacent to all pixel units (e.g., 8 pixel units) of the first region 510. In other words, the first region 510 is a ring-shaped region surrounding the outside of the target pixel unit 501.
In step S440, a portion of the pixel units in the first region 510 is turned on according to the first ratio.
In some embodiments, the first ratio may be 100%. For example, in the pixel unit of the light valve layer 310 (as shown in fig. 3), the positions of 8 pixel units corresponding to the first region 510 are all turned on.
In step S450, a second region 520 adjacent to the first region 510 is selected.
In some embodiments, the second region 520 is all pixel units around the first region 510, such that the first region 510 is annularly adjacent to all pixel units (e.g., 16 pixel units) of the second region 520. In other words, the second region 520 is a ring-shaped region surrounding the outside of the first region 510.
In step S460, a portion of the pixel units in the second region 520 are turned on according to a second ratio.
In some embodiments, the second ratio is less than the first ratio. For example, the second proportion may be 50%. In the pixel units of the light valve layer 310 (shown in fig. 3), one of the two pixel units is turned on and the other is not turned on among the 16 pixel units corresponding to the second region 520.
By analogy, the driving method of the pixel circuit can design the number of the areas according to actual requirements. The above steps S410 to S460 illustrate two adjacent regions and two corresponding conduction ratios to achieve the effects of solving the gray scale inversion problem and improving the contrast.
In some embodiments, the driving method of the pixel circuit of the present invention provides five adjacent regions for illustration, which have steps similar to steps S450 to S460 of fig. 4.
In some embodiments, as shown in FIG. 5, a third region 530 is selected adjacent to the second region 520. The third region 530 is all pixel units around the second region 520 such that the second region 520 is annularly adjacent to all pixel units (e.g., 24 pixel units) of the third region 530. In other words, the third region 530 is an annular region surrounding the second region 520.
Next, the pixel units of the third region 530 of the portion are turned on according to a third ratio. In some embodiments, the third ratio is less than the second ratio. For example, the third proportion may be 33.3%. For example, in the pixel unit of the light valve layer 310 (as shown in fig. 3), among the positions of 24 pixel units corresponding to the third region 530, one of three pixels is turned on, and two of the three pixels are not turned on.
Similarly, a fourth region 540 is selected adjacent to the third region 530. The fourth region 540 is all pixel cells around the third region 530 such that the third region 530 is annularly adjacent to all pixel cells (e.g., 32 pixel cells) of the fourth region 540. In other words, the fourth region 540 is a ring-shaped region surrounding the outside of the third region 530.
Next, the pixel units of the fourth region 540 of the portion are turned on according to a fourth ratio. In some embodiments, the fourth ratio is less than the third ratio. For example, the fourth proportion may be 25%. In the pixel units of the light valve layer 310 (shown in fig. 3), among the positions corresponding to the 32 pixel units of the fourth region 540, one of four pixels is turned on, and three of the four pixels are not turned on.
Similarly, a fifth region 550 is selected adjacent to the fourth region 540. The fifth region 550 is all pixel units around the fourth region 540 such that the fourth region 540 is annularly adjacent to all pixel units (e.g., 40 pixel units) of the fifth region 550. In other words, the fifth region 550 is an annular region surrounding the outside of the fourth region 540.
Next, the pixel cells of the fifth area 550 of the portion are turned on according to a fifth ratio. In some embodiments, the fifth ratio is less than the fourth ratio. For example, the fifth proportion may be 20%. In the pixel units of the light valve layer 310 (shown in fig. 3), among the positions corresponding to the 40 pixel units of the fifth region 550, one of five pixels is turned on, and four are not turned on.
In some embodiments, substantially the same non-conductive pixel cell spacing is present between the conductive pixel cells in each region. For example, as shown in fig. 5, the second ratio is 50%, and therefore, in the second region 520, the turned-on pixel cells, the turned-off pixel cells, the turned-on pixel cells and the turned-off pixel cells … are regularly arranged. As another example, the third ratio is 33.3%, and thus in the third region 530, the turned-on pixel cells-the turned-off pixel cells … are arranged regularly. In other words, the proportion of the peripheral area is smaller, so that the number of turned-on pixel units is smaller, and the number of turned-off pixel units is larger.
In some embodiments, before determining which pixel unit of the peripheral region is to be turned on, the non-turned-on pixel units of the inner region are searched, so that at least one of the turned-on pixel units of the peripheral region is adjacent to the non-turned-on pixel unit of the inner region. For example, as shown in fig. 5, before the third area 530 turns on the first pixel unit, the non-turned-on pixel units of the second area 520 are searched.
Then, only the pixel cells adjacent to the non-turned-on pixel cells of the second region 520 in the third region 530 are selected as the first turned-on pixel cells of the third region 530. For example, the pixel cell 531 in the third region 530 is adjacent to the non-turned-on pixel cell 521 in the second region 520. Therefore, the pixel cell 531 of the third region 530 will be the first turned on pixel cell. Then, the pixel units in the third area 530 are turned on according to the third ratio and the first turned-on pixel unit, for example, after two turned-off pixel units are separated in a counterclockwise or clockwise order based on the first turned-on pixel unit, the other turned-on pixel units are turned on. Thus, the pixel units of the turned-on third region 530 and the pixel units of the turned-off third region 530 are sequentially arranged at a third ratio.
In other embodiments, the driving method of the present disclosure may first find the turned-on pixel cells in the inner peripheral region to determine the first pixel cells in the outer peripheral region that will not be turned on. Thus, at least one of the non-conductive pixel units in the peripheral region is adjacent to the conductive pixel unit in the inner region. Similar to the foregoing description, the pixel units of the third area 530 are turned on according to a third ratio and the first non-conductive pixel unit, for example, in a counterclockwise sequence or a clockwise sequence based on the first non-conductive pixel unit, and after one non-conductive pixel unit is separated (i.e., two non-conductive pixel units are not turned on), other pixel units are turned on, so that the pixel units of the third area 530 that are turned on and the non-conductive pixel units that are turned on are sequentially arranged according to the third ratio.
The invention provides a driving method of a pixel circuit of other embodiments. Referring to fig. 6A-6B, driving processes performed around a target pixel and display results thereof according to other embodiments of the invention are shown. In contrast to the neighboring regions of fig. 5, which are formed by square ring-shaped regions to turn on or off the pixel unit, fig. 6A is formed by long regions to determine whether the pixel unit is turned on or off. The following description refers to fig. 4 and 6A together.
In step S410, a target pixel unit 601 is selected. In this embodiment, a plurality of target pixel units 601 are selected to make the target region present a long region.
In step S420, it is determined whether the gray-scale value of the target pixel unit 601 is greater than the threshold value. It should be apparent to one skilled in the art that the determination of "yes" in step S420 can be designed according to actual requirements, for example, all the gray-scale values of the target pixel units 601 are required to be greater than the threshold value, or as long as one gray-scale value of one target pixel unit 601 is greater than the threshold value, the invention is not limited thereto.
In step S430, a first region 610 adjacent to the target pixel unit 601 is selected. Likewise, the first region 610 is an elongated region.
In step S440, the pixel units in the first region 610 are turned on according to the first ratio. In some embodiments, the first ratio is 100%, that is, all the pixel units in the first region 610 are turned on.
In step S450, a second region 620 adjacent to the first region 610 is selected. Similarly, the second region 620 is an elongated region.
In step S460, the pixel units in the second region 620 are turned on according to the second ratio. In some embodiments, the second ratio is 50%, i.e., half of the pixel cells in the second region 620 are turned on. As described in fig. 5, the turned-on pixel units and the turned-off pixel units in the second region 620 are uniformly distributed, for example, the turned-on pixel units are spaced by one pixel unit.
It should be noted that the processing manner of the third area 630 in fig. 6A is similar to the execution of steps S450 to S460 in fig. 5, and therefore, the description thereof is not repeated.
In some embodiments, only the pixel cells adjacent to the non-turned-on pixel cells of the second region 620 in the third region 630 are selected as the first turned-on pixel cells of the third region 630. For example, the pixel unit 631 in the third region 630 is adjacent to the non-turned-on pixel unit 621 in the second region 620. Accordingly, the pixel unit 631 of the third region 630 will be the first turned-on pixel unit. Next, the pixel units in the third area 630 are turned on according to the third ratio and the first turned-on pixel unit, for example, after two turned-off pixel units are separated in the vertical order based on the first turned-on pixel unit, the other turned-on pixel units are turned on. In this way, the pixel units of the turned-on third region 630 and the pixel units of the turned-off third region 630 are sequentially arranged at a third ratio.
In other embodiments, the driving method of the present invention first searches for the turned-on pixel cells in the inner peripheral region to determine the first pixel cells in the outer peripheral region that will not be turned on. Thus, at least one of the non-conductive pixel units in the peripheral region is adjacent to the conductive pixel unit in the inner region. Similar to the foregoing description, the pixel units in the third area 630 are turned on according to a third ratio and the first non-conductive pixel unit, for example, after one non-conductive pixel unit is separated (i.e., two non-conductive pixel units are not turned on) according to the vertical sequence based on the first non-conductive pixel unit, the other pixel units are turned on, so that the pixel units in the third area 630 that are turned on and the non-conductive pixel units that are not turned on are sequentially arranged according to the third ratio.
In some embodiments, after the driving method of the pixel circuit is performed, as shown in the resulting image 680 shown in FIG. 6B, the central region 681 gradually decreases the number of turned-on pixel units from inside to outside, such as the regions 683, 685 and 687, so that the overall display is softer.
In summary, the driving method of the pixel circuit provided by the invention gradually reduces the turned-on pixel units from inside to outside by adjusting the turned-on ratio of the pixel units, and uniformly distributes the arrangement of the turned-on pixel units, so as to solve the technical problem of gray scale inversion which occurs in the past, and achieve the effect of gradual brightness.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A driving method of a pixel circuit, wherein the pixel circuit comprises a plurality of pixel units, the driving method comprising:
selecting one or more target pixel units in the plurality of pixel units;
judging whether the gray-scale value of one or more target pixel units is larger than a threshold value;
when the gray-scale value of the one or more target pixel units is judged to be larger than the threshold value, selecting a first area adjacent to the one or more target pixel units, wherein the first area comprises a plurality of first area pixel units;
conducting a portion of the plurality of first area pixel units according to a first ratio;
selecting a second area adjacent to the first area, wherein the second area comprises a plurality of second area pixel units; and
turning on a part of the second area pixel units according to a second proportion, wherein the second proportion is smaller than the first proportion.
2. The driving method according to claim 1, further comprising:
selecting a third area adjacent to the second area, wherein the third area comprises a plurality of third area pixel units; and
and conducting the plurality of third area pixel units according to a third proportion, wherein the third proportion is smaller than the second proportion.
3. The driving method according to claim 1, further comprising:
and turning on part of the plurality of pixel units.
4. The method according to claim 1, wherein the plurality of second-area pixel units turned on according to the second ratio are spaced apart from each other in the second area.
5. The method according to claim 2, wherein the third area pixel units of the portion turned on according to the third ratio are spaced apart from each other in the third area.
6. The driving method as claimed in claim 2, wherein the first region, the second region and the third region are a ring region or an elongated region.
7. The driving method as claimed in claim 1, wherein the first region is annularly adjacent or linearly adjacent to the one or more target pixel units, and the second region is annularly adjacent or linearly adjacent to the first region.
8. The driving method as claimed in claim 1, wherein the first proportion is one hundred percent and the second proportion is fifty percent.
9. The driving method according to claim 2, further comprising:
selecting a non-conductive pixel unit in the plurality of second area pixel units;
conducting a pixel unit adjacent to the non-conducting pixel unit in the third area pixel units; and
and conducting the plurality of third area pixel units of the part according to the third proportion.
10. The driving method according to claim 2, further comprising:
selecting a conducting pixel unit in the plurality of second area pixel units;
a pixel unit adjacent to the conducting pixel unit is not conducted in the third area pixel units; and
and conducting the plurality of third area pixel units of the part according to the third proportion.
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| TW108147682A TWI712025B (en) | 2019-12-25 | 2019-12-25 | Driving method for pixel circuit |
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Also Published As
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| TWI712025B (en) | 2020-12-01 |
| CN111489716A (en) | 2020-08-04 |
| TW202125480A (en) | 2021-07-01 |
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