CN110875020B - Driving method, driving device and display device - Google Patents
Driving method, driving device and display device Download PDFInfo
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- CN110875020B CN110875020B CN201911207363.1A CN201911207363A CN110875020B CN 110875020 B CN110875020 B CN 110875020B CN 201911207363 A CN201911207363 A CN 201911207363A CN 110875020 B CN110875020 B CN 110875020B
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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
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The invention discloses a driving method, a driving device and a display device, wherein the target brightness is determined at least according to the brightness adjustment proportion required to be adjusted, rather than according to a fixed gray scale compensation value in the prior art, so that the inconsistent brightness adjusted under high and low gray scales when the target brightness is determined according to the gray scale compensation value can be avoided, the brightness adjusted under the high and low gray scales can be ensured to be consistent, and the uniformity of display can be improved under the high and low gray scales and the problem of color cast can be solved. And when the target brightness is determined, the target brightness is obtained by real-time calculation according to the preset brightness adjustment proportion, the preset gray scale brightness corresponding relation and the gray scale signals, so that the situation that a large amount of data is stored to occupy more space can be avoided, and the target brightness can be accurately processed according to the image which needs to be displayed actually, so that the display effect of the display device is effectively improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method, a driving device, and a display device.
Background
Along with the development of displays, a flexible display is provided, the display is provided with a bending area, the bending area can be located on the side of the display, and the bending area can display images, so that the flexible display has a high screen occupation ratio and a narrow frame, and the user experience is greatly improved.
However, when the non-bent region is viewed from the front at a front viewing angle, the brightness of the bent region changes with the viewing angle, i.e., the brightness of the bent region rapidly decreases with the viewing angle gradually increasing, so that the bent region appears dark at a large viewing angle, and the display brightness of the bent region is different from that of the non-bent region.
Moreover, when the pixels in the flexible display comprise a red sub-pixel, a green sub-pixel and a blue sub-pixel, because the brightness of the red sub-pixel, the brightness of the green sub-pixel and the brightness of the blue sub-pixel are not uniformly attenuated with the increase of the viewing angle, the problem of bluish bent areas under large viewing angles is caused, and thus the display effect is reduced.
Therefore, how to improve the display effect of the flexible display having the bending region is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a driving method, a driving device and a display device, which are used for improving the display effect of a flexible display with a bending area.
In a first aspect, an embodiment of the present invention provides a driving method for a display panel, where the display panel has a bending region, the driving method including:
receiving a gray scale signal carrying an image to be displayed;
when the brightness of the sub-pixels positioned in the bending area needs to be adjusted, calculating the target brightness of the sub-pixels positioned in the bending area according to a preset brightness adjustment proportion, a preset gray scale brightness corresponding relation and the gray scale signals;
and driving the sub-pixels positioned in the bending area according to the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation.
In a second aspect, an embodiment of the present invention provides a driving apparatus for a display panel, including:
the receiving unit is used for receiving gray scale signals carrying images to be displayed;
the judging unit is used for determining whether the brightness of the sub-pixels positioned in the bending area needs to be adjusted or not;
the calculating unit is used for calculating the target brightness of the sub-pixels positioned in the bending area according to a preset brightness adjusting proportion, a preset gray scale brightness corresponding relation and the gray scale signals when the judging unit determines that the brightness of the sub-pixels positioned in the bending area needs to be adjusted;
and the driving unit is used for driving the sub-pixels positioned in the bending area according to the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation.
In a third aspect, an embodiment of the present invention provides a display device, including: the driving device provided by the embodiment of the invention.
The invention has the following beneficial effects:
the driving method, the driving device and the display device provided by the embodiment of the invention have the following advantages:
first, the target brightness of the sub-pixels located in the bending region is calculated according to the preset brightness adjustment ratio, the preset gray scale brightness corresponding relation and the gray scale signal, and then the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation is determined, so that in the embodiment of the invention, the target brightness is determined at least according to the brightness adjustment ratio to be adjusted, rather than determining the target brightness according to the fixed gray scale compensation value in the prior art, so that the brightness inconsistency of adjustment under high and low gray scales when the target brightness is determined according to the gray scale compensation value, that is, the brightness consistency of adjustment under high and low gray scales when the target brightness is determined according to the brightness adjustment ratio to be adjusted can be ensured, thereby ensuring that the uniformity of display and the problem of color cast can be improved under high and low gray scales, and improving the display effect.
Secondly, in the embodiment of the present invention, when the target brightness is determined, the target brightness is obtained by performing real-time calculation according to the preset brightness adjustment ratio, the preset gray scale brightness correspondence relationship, and the gray scale signal, so that not only can a large amount of space occupied by storing a large amount of data be avoided, but also accurate processing can be performed according to an image to be actually displayed, so that a displayed image is closer to an actual situation when the sub-pixels in the curved area are driven by the gray scale corresponding to the target brightness, and thus, the display effect of the display device can be effectively improved.
Drawings
FIG. 1 is a schematic perspective view of a display panel;
FIG. 2 is a diagram illustrating a relationship between gray scales and brightness;
fig. 3 is a schematic diagram of a driving method of a display panel according to an embodiment of the invention;
FIG. 4 is a flow chart of determining a target luminance of a sub-pixel located in a bending region according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating determining gray scales corresponding to target brightness in a gray scale brightness correspondence according to an embodiment of the present disclosure;
FIG. 7 is a flow chart of an embodiment provided in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a driving apparatus of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
Specific embodiments of a driving method, a driving apparatus, and a display apparatus according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventor finds in research that, for the schematic three-dimensional structure of the display panel shown in fig. 1, the display panel includes a display area a, and the display area a includes a first area a1 and a second area a2, where the first area a1 may be a non-bending area, and the second area a2 may be a bending area, and the bending area is located on a side surface of the display panel, so that the display can be performed by using the bending area on the side surface, thereby increasing an area of the display area, and implementing a high screen area and a narrow bezel design.
However, when the image displayed in the display region is viewed at a front viewing angle, i.e., along a direction perpendicular to the first region a1 (i.e., along the direction indicated by the dashed arrow in fig. 1), the second region a2 is in a viewing range of a large viewing angle, and the display brightness of the second region a2 rapidly decreases with an increase of the viewing angle, so that the second region a2 is dark at the large viewing angle, i.e., the display region is not uniformly displayed at the large viewing angle.
At present, in order to solve the problem of non-uniform display of the display region under a large viewing angle, in the Demura compensation process, different gray scales correspond to different luminances, so the luminance of the second region a2 can be increased by increasing the gray scale of the second region a 2.
However, this solution can dramatically degrade the low gray level visual effect under the condition of ensuring that the high gray level visual effect meets the customer's requirements, because:
in the Demura compensation process, the gray scale compensation values corresponding to the high and low gray scales are the same, as shown in the corresponding relationship diagram of the gray scale and the brightness shown in fig. 2, taking the gray scale compensation value as 14 gray scales as an example:
at 16 gray scales, 30 gray scales are obtained after 14 gray scales are compensated, and the brightness is improved by 298% at the time;
at 32 gray scale, the brightness is improved by 122% when the gray scale is 46 gray scale after the 14 gray scale is compensated;
at 64 gray scales, the brightness is improved by 54% when the brightness is 78 gray scales after the 14 gray scales are compensated;
at the gray level of 128, the gray level is 142 after the 14 gray levels are compensated, and the brightness is improved by 25 percent;
at the gray level of 192, the brightness is increased by 15% when the gray level of 206 is obtained after the gray level of 14 is compensated.
In fig. 2, the brightness corresponding to the 192 gray scale is about 0.54, and the brightness corresponding to the 206 gray scale is about 0.62, so that the brightness change from the 192 gray scale to the 206 gray scale is: 0.62-0.54 to 0.08, when the brightness enhancement ratio is: 0.08/0.54 ≈ 0.15.
It can be seen that when the gray scale compensation values corresponding to the high and low gray scales are the same, the luminance improvement ratios are different, and if the luminance improvement ratio based on the high gray scale is set, the luminance of the low gray scale is improved more, which may cause the problem that the second area a2 is shiny at a large viewing angle when the low gray scale is low; when the luminance increase ratio based on the low gray scale is set, the luminance increase of the high gray scale is small, and the problem that the second region a2 is dark at a large viewing angle at the time of the high gray scale still cannot be solved.
Therefore, the above solution cannot take into account the visual effects in high and low gray scales, and thus cannot effectively solve the problem of non-uniform display in the display area under a large viewing angle.
Further, when the display region includes a plurality of pixels, and each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, since the luminances of the red sub-pixel, the green sub-pixel, and the blue sub-pixel are not uniformly attenuated as the viewing angle increases, a problem of bluish second region a2 at a large viewing angle, that is, a problem of color shift at a large viewing angle occurs.
At present, in order to solve the problem of color shift under a large viewing angle, the brightness of each sub-pixel can be collected by modifying the Demura camera, and then the Demura compensation data is modified according to the modified brightness.
However, if it is ensured that there is no color shift at the high gray level, the second region a2 may be reddened due to overcompensation at the low gray level, so even if the color shift at the high gray level is solved, the color shift at the low gray level still cannot be solved, that is, the solution still has the problem of failing to take into account the visual effects at the high and low gray levels, and cannot effectively solve the color shift at the large viewing angle.
Accordingly, embodiments of the present invention provide a driving method for a display panel, which can consider both the visual effects of high and low gray scales, effectively solve the problems of color cast and non-uniform display brightness, and improve the display effect.
Specifically, an embodiment of the present invention provides a driving method for a display panel, where the display panel has a bending region, and the driving method, as shown in fig. 3, may include:
s301, receiving a gray scale signal carrying an image to be displayed;
the display panel includes a non-bending region (which may be understood as a first region a1 in fig. 1) in addition to a bending region (which may be understood as a second region a2 in fig. 1), and accordingly, the received gray-scale signal includes: the display device comprises a bending area, a plurality of sub-pixels and a plurality of non-bending areas, wherein the bending area is used for driving the sub-pixels to display gray scales, the sub-pixels are located in the bending area and used for driving the sub-pixels located in the non-bending area to display gray scales, and the sub-pixels can display corresponding brightness when corresponding gray scales are input.
S302, determining whether the brightness of the sub-pixels positioned in the bending area needs to be adjusted; if yes, go to step S303; if not, go to step S305;
s303, calculating the target brightness of the sub-pixels in the bending area according to a preset brightness adjustment ratio, a preset gray scale brightness corresponding relation and a gray scale signal;
s304, driving the sub-pixels positioned in the bending area according to the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation; ending the flow;
s305, driving the sub-pixels in the bending area according to the received gray scale signals.
Therefore, in the embodiment of the present invention, the target brightness is determined at least according to the brightness adjustment ratio to be adjusted, rather than according to the fixed gray-scale compensation value as in the prior art, so that the inconsistency of the adjusted brightness at the high gray-scale and the low gray-scale when the target brightness is determined according to the gray-scale compensation value can be avoided, that is, when the target brightness is determined according to the brightness adjustment ratio to be adjusted, the brightness adjusted at the high gray-scale and the low gray-scale can be ensured to be consistent, thereby ensuring that the uniformity of the display can be improved at the high gray-scale and the low gray-scale, solving the color cast problem, and improving the display effect.
It should be noted that, for the same sub-pixel, the brightness of the sub-pixel may be different in different frames, and the gray scale of the corresponding sub-pixel is also different. If the target brightness of the sub-pixel is calculated in real time according to the gray scale of the sub-pixel in the gray scale signal, the preset brightness adjustment ratio and the preset gray scale brightness corresponding relation to obtain the target brightness, the preset brightness adjustment ratio and the preset gray scale brightness corresponding relation only need to be stored in advance in the display device, a large amount of gray scale and brightness data do not need to be stored, and the storage space of a memory for storing the preset brightness adjustment ratio and the preset gray scale brightness corresponding relation in the display device can be greatly reduced. In addition, the image to be displayed can be accurately processed according to the actual image to be displayed, so that the displayed image quality is higher and the display is more uniform when the sub-pixels in the bent area are driven by the gray scale corresponding to the target brightness, and the display effect of the display device can be effectively improved.
In practical implementation, in the embodiment of the present invention, when the display panel further includes the non-bending region, the driving method further includes:
and driving the sub-pixels positioned in the non-bending area according to the gray scale of the sub-pixels positioned in the non-bending area in the received gray scale signal.
That is to say, when driving the sub-pixels in the bending region, the target brightness of the sub-pixels in the bending region needs to be calculated according to the preset brightness adjustment ratio, the preset gray scale brightness correspondence relationship, and the gray scale signal, and then the gray scale corresponding to the target brightness is used for driving, so as to solve the problems of darkening and color cast of the bending region under a large viewing angle.
When the sub-pixels in the non-bending region are driven, the non-bending region does not have the problems of darkening and color shift of the bending region under a large viewing angle, so that the brightness of the sub-pixels in the non-bending region does not need to be adjusted, and the gray scale corresponding to the sub-pixels in the non-bending region in the received gray scale signal can be directly adopted for driving.
Therefore, the bending area and the non-bending area of the display panel can be enabled to normally display, the problems of darkening of the bending area and color cast are solved, the display effect is improved, the complexity of increasing the driving mode can be favorably avoided, the original driving mode is kept for the area which does not need to be adjusted, the power consumption of the driving device is favorably reduced, and the driving efficiency of the driving device is improved.
In a specific implementation, in the embodiment of the present invention, determining whether the brightness of the sub-pixel located in the bending region needs to be adjusted specifically includes:
determining whether an adjusting instruction sent by a processor is received;
if so, determining that the brightness of the sub-pixels positioned in the bending area needs to be adjusted;
if not, determining that the brightness of the sub-pixels positioned in the bending area does not need to be adjusted.
The adjustment instruction may be sent by a user of the display device, in order to facilitate the user to send the adjustment instruction, an operation button for triggering the adjustment instruction may be provided on the display device, and the specific process may be:
the operating button can trigger the adjusting instruction on the display device when the user has higher requirements on the display picture and needs to adjust the display condition of the bending area;
the operation button may be implemented by hardware, that is, a corresponding key or button is set on the display device, and may also be implemented by software design, so that the button is displayed on the operation interface, which is not limited herein.
When recognizing that the user has triggered the operation button, the processor in the display device sends an adjustment instruction to the drive device.
Of course, the adjustment instruction may also be automatically triggered by the display device, for example, if the processor in the display device recognizes that a high-quality picture (for example, but not limited to, a video picture or the like) needs to be displayed currently, the processor may automatically send the adjustment instruction to the driving device, so that the driving device adjusts the brightness of each sub-pixel in the bending region to ensure that the display picture has a high-quality display effect.
In specific implementation, in the embodiment of the present invention, the target brightness of the sub-pixel located in the bending region is calculated according to the preset brightness adjustment ratio, the preset gray-scale brightness corresponding relationship, and the gray-scale signal, which may specifically include the following steps, as shown in the flowchart of fig. 4, of determining the target brightness of the sub-pixel located in the bending region:
s401, determining the brightness adjustment proportion of the sub-pixels at different positions in the bending area according to a preset brightness adjustment proportion;
s402, determining the brightness corresponding to the gray scale of the sub-pixel positioned in the bending area in the gray scale signal according to the preset gray scale brightness corresponding relation, and defining the determined brightness as the initial brightness;
and S403, adjusting the initial brightness according to the brightness adjustment proportion of the sub-pixels in the bending area to obtain the target brightness.
The display device may pre-store a gray scale brightness correspondence relationship, as shown in table 1, the table only shows a correspondence relationship between a part of gray scales and a part of brightness, the table 1 shows a correspondence relationship between gray scales and brightness, and different gray scales correspond to different brightnesses, so that according to the table 1, brightness corresponding to different gray scales can be found, and gray scales corresponding to different brightnesses can also be found.
Therefore, the brightness corresponding to the gray scale of the sub-pixel in the bending region in the received gray scale signal can be determined according to table 1, and after the target brightness is determined, the gray scale corresponding to the target brightness can be found according to table 1.
Of course, in practical cases, the specific form of the gray-scale luminance correspondence relationship is not limited to that shown in table 1, and the correspondence relationship between gray-scale and luminance, and the setting ranges of gray-scale and luminance are also not limited to that shown in table 1, and the description is given here by taking table 1 as an example.
For example, for a certain sub-pixel in the bending region, the gray scale corresponding to the received gray scale signal is 64, the initial brightness corresponding to the gray scale is 4.78% after being searched by table 1, and if the target brightness of the sub-pixel after being subjected to the brightness processing is 5.64%, the gray scale corresponding to the target brightness of the sub-pixel is 69.
TABLE 1
| Gray scale | Brightness of light | Gray scale | Brightness of light | Gray scale | Brightness of light | Gray scale | Brightness of light | Gray scale | Brightness of light |
| 0 | 0.00％ | 14 | 0.17％ | 28 | 0.78％ | 42 | 1.89％ | 56 | 3.50％ |
| 1 | 0.00％ | 15 | 0.20％ | 29 | 0.84％ | 43 | 1.99％ | 57 | 3.70％ |
| 2 | 0.00％ | 16 | 0.23％ | 30 | 0.90％ | 44 | 2.10％ | 58 | 3.85％ |
| 3 | 0.01％ | 17 | 0.26％ | 31 | 0.97％ | 45 | 2.20％ | 59 | 3.99％ |
| 4 | 0.01％ | 18 | 0.29％ | 32 | 1.04％ | 46 | 2.31％ | 60 | 4.15％ |
| 5 | 0.02％ | 19 | 0.33％ | 33 | 1.11％ | 47 | 2.42％ | 61 | 4.30％ |
| 6 | 0.03％ | 20 | 0.37％ | 34 | 1.19％ | 48 | 2.54％ | 62 | 4.46％ |
| 7 | 0.04％ | 21 | 0.41％ | 35 | 1.27％ | 49 | 2.65％ | 63 | 4.61％ |
| 8 | 0.05％ | 22 | 0.46％ | 36 | 1.35％ | 50 | 2.78％ | 64 | 4.78％ |
| 9 | 0.06％ | 23 | 0.50％ | 37 | 1.43％ | 51 | 2.90％ | 65 | 4.94％ |
| 10 | 0.08％ | 24 | 0.55％ | 38 | 1.52％ | 52 | 3.03％ | 66 | 5.11％ |
| 11 | 0.10％ | 25 | 0.60％ | 39 | 1.61％ | 53 | 3.16％ | 67 | 5.28％ |
| 12 | 0.12％ | 26 | 0.66％ | 40 | 1.70％ | 54 | 3.29％ | 68 | 5.46％ |
| 13 | 0.14％ | 27 | 0.72％ | 41 | 1.79％ | 55 | 3.42％ | 69 | 5.64％ |
To illustrate, the luminance in table 1 is substantially normalized luminance, and the normalized luminance can be determined according to the gray scale and the preset gamma value, and the specific determination method is as follows:
if the gray scale range is 0-255, the normalized brightness corresponding to each gray scale is calculated by adopting the following formula:
L＝(Grey/255)g；
wherein, gray represents any gray scale, L represents normalized luminance corresponding to the gray scale, g represents a preset gamma value, and in the above table 1, the gamma value may be 2.2, so that normalized luminance corresponding to other gray scales can be calculated by the above formula and gamma value.
Of course, in practical cases, the gamma value is not limited to 2.2, and table 1 is only an example, and the gamma value is not specifically limited in the embodiments of the present invention.
Therefore, optionally, in the embodiment of the present invention, the gamma values corresponding to the correspondence between different grayscales and luminances in the grayscale luminance correspondence are the same.
That is, in the gray scale and brightness correspondence relationship, the gray scales and the brightness correspond to each other one by one, and if the gray scales and the brightness corresponding to one by one are regarded as a group of data, the gamma values corresponding to different groups of data are the same.
Therefore, the determining process of the gray scale brightness corresponding relation is simpler, errors and long time consumption of the determining result caused by the complex determining process are avoided, the gray scale brightness corresponding relation is simpler, the occupied memory is small, the storage is convenient, meanwhile, the driving device can read corresponding numerical values from the gray scale brightness corresponding relation quickly, and the processing speed of the driving device is improved.
In practical cases, the number of sub-pixels included in the bending region may be many, and the display luminance of different sub-pixels may be different, and if the luminance adjustment ratios of the sub-pixels in the bending region are the same, when the bending region is viewed from the front, the bending region is at a large viewing angle, and as the bending angle of the bending region increases, the darkening and color shift phenomena at the position with a smaller bending angle may be eliminated, and the darkening and color shift phenomena at the position with a larger bending angle may not be eliminated.
Therefore, optionally, in order to effectively eliminate the problems of darkening and color shift of the entire bending region, in the embodiment of the present invention, the brightness adjustment ratio of the sub-pixel located in the bending region is positively correlated to the bending angle of the region where the sub-pixel is located.
That is to say, the brightness adjustment ratios of the sub-pixels at different bending angles are different, that is, if the bending angle at the position of the sub-pixel in the bending area is larger, the brightness adjustment ratio of the sub-pixel is larger; if the bending angle of the position of the sub-pixel in the bending area is smaller, the brightness adjustment proportion of the sub-pixel is smaller.
Meanwhile, the brightness adjustment proportion of the sub-pixels at the same bending angle can be the same, so that the complexity of a driving mode is reduced, the storage space occupied by the brightness adjustment proportion can be reduced, and the requirement on the size of the storage space is reduced.
For example, as shown in the structural diagram of a display panel shown in fig. 5, as shown in the diagram, a1 represents a non-bending region, a2 represents a bending region, P represents a pixel, and the bending region includes 5 columns of sub-pixels, but in an actual situation, the number of sub-pixel columns included in the bending region is not limited to 5 columns, and the number of sub-pixel columns included in the non-bending region is not limited to 4 columns, and may be set as required, and is not limited herein. In addition, although one bending region is shown in the drawings, this does not mean that only one bending region is provided in an actual display panel, and the illustration is merely an example, and the specific number of the bending regions is not particularly limited.
Referring to fig. 5, a cross-sectional view in a direction perpendicular to the surface of the display panel and parallel to the arrangement direction (X direction as shown in the figure) of the bending region a2 and the non-bending region a1 is shown, wherein, for the bending region a2, the bending angle gradually increases along the direction from the left side to the right side in the figure, that is, the bending angle gradually increases from the 1 st column of sub-pixels (i.e., the column in which the sub-pixel labeled P1 is located) to the 5 th column of sub-pixels (i.e., the column in which the sub-pixel labeled P2 is located), and accordingly, the luminance adjustment ratio gradually increases from the 1 st column of sub-pixels to the 5 th column of sub-pixels.
Of course, the change of the bending angle at each position in the bending region is not limited to that shown in fig. 5, and here, only the change shown in fig. 5 is taken as an example for description, in an actual situation, the bending angle may be set correspondingly according to actual needs to meet the needs of different application scenarios, so as to improve the flexibility of design.
Referring to fig. 5, taking the sub-pixel labeled as P3 as an example, a straight line at a boundary between the bending region a2 and the non-bending region a1 is a first straight line and is represented by a dashed line m1, the first straight line m1 is parallel to the Y direction, and a connection line between a center point U of the sub-pixel and a center of the bending region a2 is represented by m2, where the bending angle can be understood as: the angle a between the first line m1 and the connection m 2.
Specifically, in the embodiment of the present invention, if the arrangement direction of the bending region and the non-bending region is defined as the first direction, for each sub-pixel located in the bending region and arranged along the first direction, the corresponding brightness adjustment ratio may be set as:
along with the gradual reduction of the bending angle, the brightness adjustment proportion of the sub-pixels is linearly decreased;
or, the brightness adjusting ratio of the sub-pixels is increased linearly with the gradual increase of the bending angle.
For example, referring to fig. 5, when the bending angle of the bending region a2 gradually decreases from the rightmost side of the bending region a2 to the leftmost side, the luminance adjustment ratio decreases linearly from the 5 th column sub-pixel to the 1 st column sub-pixel.
If the brightness adjustment ratio corresponding to the sub-pixel in the 5 th row is 5%, then:
the brightness adjustment ratio corresponding to the sub-pixel of the 4 th column is 5% - (5%/5) ═ 4%;
the brightness adjustment ratio corresponding to the sub-pixel in the 3 rd column is 5% -2 × (5%/5) ═ 3%;
the brightness adjustment ratio corresponding to the sub-pixel in the 2 nd column is 5% -3 × (5%/5) ═ 2%;
the luminance adjustment ratio for the 1 st column sub-pixel is 1% to 5% -4 × (5%/5).
Therefore, the junction of the bending area and the non-bending area can be prevented from generating larger brightness difference, and then the junction can be prevented from generating a macroscopic boundary, so that the brightness consistency of the bending area and the non-bending area can be improved, and the display effect can be improved.
Of course, what the brightness adjustment ratio of each sub-pixel along the first direction is specifically set may be set according to actual needs and stored in the driving device, and the present invention is not limited to the above example.
It should be noted that, in order to solve the problems of color shift and darkening in the bent region under a large viewing angle, a certain pixel in the bent region is used, and the pixel includes: for example, the red sub-pixel, the green sub-pixel, and the blue sub-pixel may be set in the following manner when setting the corresponding brightness adjustment ratio:
the brightness adjustment proportion comprises: the color filter comprises a first adjusting proportion and a second adjusting proportion, wherein the first adjusting proportion is used for solving the problem of darkening, and the second adjusting proportion is used for solving the problem of color cast.
For the first adjustment ratios, the first adjustment ratios corresponding to the red sub-pixel, the green sub-pixel and the blue sub-pixel in the pixel may be set to be the same, for example, to be 10%.
For the second adjustment ratio, if the color shift is bluish, the second adjustment ratios corresponding to the blue sub-pixel and the green sub-pixel in the pixel may be both set to 0, and the second adjustment ratio of the red sub-pixel in the pixel may be set to be greater than 0, for example, to 17%.
Of course, if the color shift is red or other cases, the second adjustment ratios of the three color sub-pixels may be set according to the color mixing ratio, and are not limited herein.
Therefore, the brightness adjustment ratio of each sub-pixel in the pixel is the sum of the first adjustment ratio and the second adjustment ratio, for example, the brightness adjustment ratio for the red sub-pixel is the sum of 10% and 17%, that is, 27%; the luminance adjustment ratio of the green sub-pixel is 10%, and the luminance adjustment ratio of the blue sub-pixel is 10%.
Similarly, the brightness adjustment ratios of the sub-pixels at other positions in the bending region are also determined in the above manner, and repeated details are not repeated.
Therefore, when the target brightness of the pixel is calculated by utilizing the brightness adjustment proportion determined in the mode, the problems of color cast and darkening can be effectively solved, the display brightness uniformity of the bending area and the non-bending area is improved, and meanwhile, the display quality of the picture is improved, so that the display effect is improved.
Optionally, in the embodiment of the present invention, adjusting the initial brightness according to the brightness adjustment ratio of the sub-pixel in the bending region to obtain the target brightness specifically includes:
calculating the target brightness corresponding to the initial brightness of the sub-pixel by adopting the following formula:
T＝Lin×(1+K)；
wherein, T represents the target brightness of the sub-pixel, Lin represents the initial brightness of the sub-pixel, and K represents the brightness adjustment ratio of the sub-pixel.
The following describes a process of determining the target luminance by taking a specific embodiment as an example.
For example, similarly, when a certain pixel (denoted as pixel a) in the bending region is also taken as an example, and the red sub-pixel included in the pixel a is taken as an example, similarly, it is assumed that the luminance adjustment ratio of the red sub-pixel in the pixel a is 27%, and the gray scale corresponding to the red sub-pixel in the pixel a in the received gray scale signal is 64:
firstly, through the table 1, the corresponding initial brightness of 4.78% when the gray scale is 64 can be found;
then, according to the formula T ═ Lin × (1+ K), the target luminance of the red subpixel can be calculated as: t4.78% × (1+ 27%) 6.07%.
Therefore, the target brightness of the sub-pixel can be determined in a simple mode, so that the calculation difficulty of the driving device can be simplified, the calculation amount of the driving device is reduced, and the processing efficiency of the driving device is improved.
In specific implementation, in the embodiment of the present invention, the determining the gray scale corresponding to the target brightness in the gray scale brightness correspondence relationship may specifically include the following steps, referring to the flowchart of determining the gray scale corresponding to the target brightness in the gray scale brightness correspondence relationship shown in fig. 6:
s601, determining whether brightness identical to target brightness exists in the gray scale brightness corresponding relation; if not, go to step S602; if yes, go to step S604;
s602, determining the brightness with the minimum difference value with the target brightness from the gray scale brightness corresponding relation, and defining the brightness as reference brightness;
s603, determining the gray scale corresponding to the reference brightness in the gray scale brightness corresponding relation as the gray scale corresponding to the target brightness; ending the flow;
s604, determining the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation.
In practical cases, after obtaining the target brightness, when looking up the corresponding gray scale in the gray scale brightness correspondence (as in table 1 above), the following two cases may occur:
case 1: the gray-scale luminance correspondence relationship has the same luminance as the target luminance.
At this time, the gray scale corresponding to the target brightness can be directly searched from the gray scale brightness corresponding relation, and the corresponding sub-pixel is driven according to the gray scale.
For example, taking the target brightness as 0.66% and the gray-scale brightness correspondence as table 1 as an example, the value of 0.66% exists in table 1, so it is necessary to adopt case 1, that is, the gray scale 26 corresponding to 0.66% in table 1 is determined as the gray scale corresponding to the target brightness of 0.66%.
Case 2: the gray-scale luminance correspondence does not have the same luminance as the target luminance.
At this time, if the corresponding gray scale cannot be found from the gray scale brightness corresponding relationship according to the target brightness, then:
finding out several luminances closest to the target luminance from the gray-scale luminance corresponding relation, then respectively making differences between the found luminances and the target luminance, comparing the magnitude relation of the difference values, selecting the one with the smallest difference value, taking the luminance in the gray-scale luminance corresponding relation corresponding to the smallest difference value as the reference luminance, and finally determining the gray scale corresponding to the reference luminance as the gray scale of the target luminance.
For example, the target luminance determined in the above example is 1.60%, and the gray scale luminance correspondence relationship is the example of the above table 1, the value of 1.60% does not exist in table 1, so the above case 2 needs to be adopted, that is, several values closest to 1.60%, such as 1.52% and 1.61%, need to be found from table 1, wherein the difference between 1.52% and 1.60% is 0.08%, the difference between 1.61% and 1.60% is 0.01%, and since 0.08% is greater than 0.01%, 1.61% is used as the reference luminance, and the gray scale 39 corresponding to 1.61% in table 1 is determined as the gray scale corresponding to the target luminance 1.60%.
Therefore, whether the gray scale brightness corresponding relation has the same numerical value with the target brightness or not, the gray scale corresponding to the target brightness can be determined according to the method, so that the sub-pixels of the bending area are driven according to the determined gray scale, the problems of darkening and color cast of the bending area under a large visual angle are solved, and the display effect is improved.
The following describes a driving method provided by an embodiment of the present invention by taking a specific embodiment as an example.
In conjunction with the flow chart shown in fig. 7.
S701, receiving a gray scale signal carrying an image to be displayed;
s702, determining whether an adjusting instruction sent by a processor is received; if yes, go to step S703; if not, go to step S711;
s703, determining the brightness corresponding to the gray scale of the sub-pixel positioned in the bending area in the gray scale signal according to the preset gray scale brightness corresponding relation, and defining the determined brightness as the initial brightness;
s704, determining the brightness adjustment proportion of the sub-pixels at different positions in the bending area according to the preset brightness adjustment proportion;
s705, adjusting the initial brightness according to the brightness adjustment proportion of the sub-pixels in the bending area to obtain target brightness;
s706, determining whether brightness identical to the target brightness exists in the gray scale brightness corresponding relation; if yes, go to step S707; if not, go to step S708;
s707, determining a gray scale corresponding to the target brightness in the gray scale brightness corresponding relation; executing step S710;
s708, determining the brightness with the minimum difference value with the target brightness from the gray scale brightness corresponding relation, and defining the brightness as reference brightness;
s709, determining the gray scale corresponding to the reference brightness in the gray scale brightness corresponding relation as the gray scale corresponding to the target brightness;
s710, driving the sub-pixels positioned in the bending area according to the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation, and driving the sub-pixels positioned in the non-bending area according to the gray scale of the sub-pixels positioned in the non-bending area in the received gray scale signals; ending the flow;
s711 drives each sub-pixel according to the gray scale of each sub-pixel in the received gray scale signal.
Based on the same inventive concept, an embodiment of the present invention provides a driving apparatus for a display panel, and the structural schematic diagram of the driving apparatus shown in fig. 8 may include:
a receiving unit 801, configured to receive a grayscale signal carrying an image to be displayed;
a determining unit 802, configured to determine whether brightness of a sub-pixel located in the bending region needs to be adjusted;
a calculating unit 803, configured to calculate target brightness of the sub-pixels located in the bending region according to a preset brightness adjustment ratio, a preset gray-scale brightness correspondence relationship, and the gray-scale signal when the determining unit 802 determines that the brightness of the sub-pixels located in the bending region needs to be adjusted;
the driving unit 804 is configured to drive the sub-pixels located in the bending region according to the gray scale corresponding to the target brightness in the gray scale brightness correspondence.
Alternatively, the driving device may be a driving IC in the display device, and the driving IC may be disposed on the display panel, and may also be disposed on a flexible circuit board electrically connected to the display panel, which is not limited herein.
And, the display device includes a memory for storing a preset gray-scale luminance correspondence and a preset luminance adjustment ratio, the memory may exist independently of the driving device, then:
the driving device can read the gray scale brightness corresponding relation and the brightness adjustment proportion stored in the memory at any time before the brightness of the sub-pixels in the bending area is adjusted, and then stores the read gray scale brightness corresponding relation and the read brightness adjustment proportion into the temporary storage space in the driving device, so that when the brightness of the sub-pixels in the bending area is adjusted, the gray scale brightness corresponding relation and the brightness adjustment proportion in the temporary storage space are called, and the brightness of the sub-pixels in the bending area is adjusted.
Therefore, when the gray-scale brightness corresponding relation and the brightness adjustment proportion are stored in the memory, the occupation of the temporary storage space in the driving device can be reduced, so that the limitation on the storage size of the driving device is reduced, and the manufacturing cost of the display device is favorably reduced.
The memory may be any structure known to those skilled in the art that can implement a storage function, and is not limited herein.
In practical situations, the gray-scale luminance correspondence and the luminance adjustment ratio may also be directly pre-stored in the driving device, and do not need to be stored in the memory and then read by the driving device, so that the interaction between the driving device and the memory can be reduced, the processing efficiency of the driving device can be improved, and the power consumption of the display device can be reduced.
Optionally, in an embodiment of the present invention, the calculating unit 803 is specifically configured to:
determining the brightness adjustment proportion of the sub-pixels at different positions in the bending area according to a preset brightness adjustment proportion;
determining the brightness corresponding to the gray scale of the sub-pixel positioned in the bending area in the gray scale signal according to the preset gray scale brightness corresponding relation, and defining the determined brightness as the initial brightness;
and adjusting the initial brightness according to the brightness adjustment proportion of the sub-pixels in the bending area to obtain the target brightness.
Optionally, in an embodiment of the present invention, the calculating unit 803 is specifically configured to:
calculating the target brightness corresponding to the initial brightness of the sub-pixel by adopting the following formula:
T＝Lin×(1+K)；
wherein, T represents the target brightness of the sub-pixel, Lin represents the initial brightness of the sub-pixel, and K represents the brightness adjustment ratio of the sub-pixel.
Optionally, in an embodiment of the present invention, the driving unit 804 is specifically configured to:
determining whether brightness identical to the target brightness exists in the gray scale brightness corresponding relation;
if not, determining the brightness with the minimum difference value with the target brightness from the gray scale brightness corresponding relation, defining the brightness as reference brightness, and determining the gray scale corresponding to the reference brightness in the gray scale brightness corresponding relation as the gray scale corresponding to the target brightness;
if yes, determining the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation.
Optionally, in an embodiment of the present invention, the driving unit 804 is further configured to:
and driving the sub-pixels positioned in the non-bending area according to the gray scale of the sub-pixels positioned in the non-bending area in the received gray scale signal.
Optionally, in this embodiment of the present invention, the determining unit 802 is specifically configured to:
determining whether an adjusting instruction sent by a processor is received;
if so, determining that the brightness of the sub-pixels positioned in the bending area needs to be adjusted;
if not, determining that the brightness of the sub-pixels positioned in the bending area does not need to be adjusted.
Based on the same inventive concept, an embodiment of the present invention provides a display device, as shown in fig. 9, which includes: such as the drive means (not shown) provided by embodiments of the present invention.
Alternatively, as shown in fig. 9, a2 represents a bending region, that is, the periphery of the display device may be provided with the bending region, so that the display device has a higher screen occupation ratio, and a narrow bezel design is achieved.
Optionally, in an embodiment of the present invention, the display device further includes: the display panel and the flexible circuit board electrically connected to the display panel, the driving device may be located on the display panel (not shown) or located on the flexible circuit board (not shown), and the present invention is not limited thereto.
The display panel may be an electroluminescent display panel (not shown), or a liquid crystal display panel (not shown).
When the display panel is an electroluminescent display panel, the electroluminescent display panel is a self-luminous display panel, so that a display device adopting the display panel does not need to be provided with a backlight module, has the characteristics of lightness, thinness and the like, and has wide application in a plurality of fields.
When the display panel is a liquid crystal display panel, the display panel is a non-self-luminous display panel, and therefore a backlight module is required to be arranged on a non-light-emitting surface of the display panel, and the backlight module is used for providing a backlight source for the display panel so as to realize the display function of the display device.
Also, the display panel includes: the liquid crystal display device comprises an array substrate, an opposite substrate and liquid crystal arranged between the array substrate and the opposite substrate, wherein the opposite substrate is opposite to the array substrate, the liquid crystal is arranged between the array substrate and the opposite substrate, the liquid crystal is not shown in the figure, one side of the array substrate, which faces the opposite substrate, comprises a pixel electrode, one side of the opposite substrate, which faces the array substrate, comprises a common electrode, and the liquid crystal can be driven to deflect through an electric field formed between the pixel electrode and the common electrode, so that a display function is realized.
Of course, the common electrode may be disposed on the array substrate in addition to the opposite substrate, and may be disposed according to actual requirements to meet requirements of different application scenarios, thereby improving flexibility of design.
In a specific implementation, the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The implementation of the display device can refer to the above embodiment of the driving device, and repeated descriptions are omitted.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A driving method of a display panel, the display panel having a bending region, the driving method comprising:
receiving a gray scale signal carrying an image to be displayed;
when the brightness of the sub-pixels positioned in the bending area needs to be adjusted, calculating the target brightness of the sub-pixels positioned in the bending area according to a preset brightness adjustment proportion, a preset gray scale brightness corresponding relation and the gray scale signals;
driving the sub-pixels positioned in the bending area according to the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation;
wherein, the gamma values corresponding to the corresponding relations between different gray scales and the brightness in the gray scale brightness corresponding relations are the same;
the preset brightness adjustment proportion is the sum of the first adjustment proportion and the second adjustment proportion;
if the bending area is dark, controlling the first adjustment proportion of each sub-pixel to be the same;
and if the bending area has color cast, controlling the second adjustment proportion of the sub-pixels corresponding to the color cast biased color to be equal to 0, and controlling the second adjustment proportion of the sub-pixels corresponding to the color cast unbiased color to be larger than 0.
2. The driving method according to claim 1, wherein calculating the target luminance of the sub-pixels located in the bending region according to a preset luminance adjustment ratio, a preset gray-scale luminance correspondence relationship, and the gray-scale signal comprises:
determining the brightness adjustment proportion of the sub-pixels at different positions in the bending area according to a preset brightness adjustment proportion;
determining the brightness corresponding to the gray scale of the sub-pixel positioned in the bending area in the gray scale signal according to a preset gray scale brightness corresponding relation, and defining the determined brightness as initial brightness;
and adjusting the initial brightness according to the brightness adjustment proportion of the sub-pixel in the bending area to obtain the target brightness.
3. The driving method according to claim 2, wherein adjusting the initial luminance according to a luminance adjustment ratio of the sub-pixel in the bending region to obtain the target luminance comprises:
calculating the target brightness corresponding to the initial brightness of the sub-pixel by adopting the following formula:
T＝Lin×(1+K)；
wherein, T represents the target brightness of the sub-pixel, Lin represents the initial brightness of the sub-pixel, and K represents the brightness adjustment ratio of the sub-pixel.
4. The driving method according to claim 2, wherein the brightness adjustment ratio of the sub-pixel located in the bending region is positively correlated with the bending angle of the region where the sub-pixel is located.
5. The driving method according to claim 1, wherein determining a gray level corresponding to the target brightness in the gray-level brightness correspondence includes:
determining whether brightness identical to the target brightness exists in the gray scale brightness corresponding relation;
if not, determining the brightness with the minimum difference value with the target brightness from the gray scale brightness corresponding relation, defining the brightness as reference brightness, and determining the gray scale corresponding to the reference brightness in the gray scale brightness corresponding relation as the gray scale corresponding to the target brightness;
and if so, determining the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation.
6. The driving method according to claim 1, wherein determining whether the brightness of the sub-pixels located in the bending region needs to be adjusted comprises:
determining whether an adjusting instruction sent by a processor is received;
if so, determining that the brightness of the sub-pixels positioned in the bending area needs to be adjusted;
and if not, determining that the brightness of the sub-pixels positioned in the bending area does not need to be adjusted.
7. The driving method according to any one of claims 1 to 6, wherein the display panel further includes a non-bending region, the driving method further comprising:
and driving the sub-pixels positioned in the non-bending area according to the gray scale of the sub-pixels positioned in the non-bending area in the received gray scale signal.
8. A driving apparatus of a display panel, comprising:
the receiving unit is used for receiving gray scale signals carrying images to be displayed;
the judging unit is used for determining whether the brightness of the sub-pixels positioned in the bending area needs to be adjusted or not;
the calculating unit is used for calculating the target brightness of the sub-pixels positioned in the bending area according to a preset brightness adjusting proportion, a preset gray scale brightness corresponding relation and the gray scale signals when the judging unit determines that the brightness of the sub-pixels positioned in the bending area needs to be adjusted;
the driving unit is used for driving the sub-pixels positioned in the bending area according to the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation;
wherein, the gamma values corresponding to the corresponding relations between different gray scales and the brightness in the gray scale brightness corresponding relations are the same;
the preset brightness adjustment proportion is the sum of the first adjustment proportion and the second adjustment proportion;
if the bending area is dark, controlling the first adjustment proportion of each sub-pixel to be the same;
and if the bending area has color cast, controlling the second adjustment proportion of the sub-pixels corresponding to the color cast biased color to be equal to 0, and controlling the second adjustment proportion of the sub-pixels corresponding to the color cast unbiased color to be larger than 0.
9. The drive device according to claim 8, characterized in that said calculation unit is specifically configured to:
determining the brightness adjustment proportion of the sub-pixels at different positions in the bending area according to a preset brightness adjustment proportion;
determining the brightness corresponding to the gray scale of the sub-pixel positioned in the bending area in the gray scale signal according to a preset gray scale brightness corresponding relation, and defining the determined brightness as initial brightness;
and adjusting the initial brightness according to the brightness adjustment proportion of the sub-pixel in the bending area to obtain the target brightness.
10. The drive device according to claim 8, characterized in that the drive unit is specifically configured to:
determining whether brightness identical to the target brightness exists in the gray scale brightness corresponding relation;
if not, determining the brightness with the minimum difference value with the target brightness from the gray scale brightness corresponding relation, defining the brightness as reference brightness, and determining the gray scale corresponding to the reference brightness in the gray scale brightness corresponding relation as the gray scale corresponding to the target brightness;
and if so, determining the gray scale corresponding to the target brightness in the gray scale brightness corresponding relation.
11. A display device, comprising: a drive arrangement according to any one of claims 8 to 10.
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| CN112382228A (en) * | 2020-12-02 | 2021-02-19 | 深圳市华星光电半导体显示技术有限公司 | Driving method and driving device of display panel |
| CN113707088B (en) * | 2021-08-26 | 2022-12-23 | 京东方科技集团股份有限公司 | Brightness compensation method and device and display device |
| CN114241997B (en) * | 2021-12-24 | 2023-03-17 | 昆山国显光电有限公司 | Brightness compensation method of display panel and related device |
| CN114694616B (en) * | 2022-04-25 | 2024-01-12 | 北京欧铼德微电子技术有限公司 | Dimming method and device of display panel, display device and electronic device |
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