The present invention relates to a display technology field, and more particularly to a method for controlling brightness of an organic light-emitting diode panel when booting.
In a flat display technology, active-matrix organic light-emitting diode (AMOLED) has many advantages such as thin, active light-emitting, fast response, wide viewing angle, colorful, high brightness, low power consumption, resistant to high and low temperature so that the AMOLED is recognized as a third generation display technology after LCD, and has been widely applied in portable products such as mobile phones, digital cameras. An AMOLED TV screen with middle size is about to begin producing. However, because OLED is a current device, when the current is greater, the heat dissipation of the OLED device is greater. In the current driving device and driving method, if brightness of a picture when booting is too high, temperature of a portion region of the panel will be too high so that the OLED device is ageing too fat or burned. Too high brightness at a portion region will cause too large current at the portion region such that a voltage offset of TFT (Thin Film Transistor) is too large in order to generate a sticking image.
The main technology problem solved by the present invention is providing a method for controlling brightness of an organic light-emitting diode panel when booting, which can reduce the probability of the image sticking of the panel caused by too large voltage offset when booting, decreasing too fast ageing of the panel device because of too large local current.
In order to solve the above technology problem, a technology solution adopted by the present invention is: providing a method for controlling brightness of an organic light-emitting diode panel when booting, the organic light-emitting diode panel includes multiple pixels, and the method comprises step of: obtaining a brightness to be displayed corresponding to each pixel in a booting process; comparing the brightness to be displayed of each pixel with a preset brightness threshold; if the brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold; using the brightness to be displayed after adjusting to adjust a grayscale value to be displayed of the pixel; using the grayscale value to be displayed to control a corresponding pixel to perform a display; gradually increasing the brightness threshold with time, and returning to the step of obtaining a brightness to be displayed corresponding to each pixel in a booting process.
In order to solve the above technology problem, a technology solution adopted by the present invention is: providing a method for controlling brightness of an organic light-emitting diode panel when booting, the organic light-emitting diode panel includes multiple pixels, and the method comprises step of: obtaining a brightness to be displayed corresponding to each pixel in a booting process; comparing the brightness to be displayed of each pixel with a preset brightness threshold; if the brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold; using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display.
In order to solve the above technology problem, a technology solution adopted by the present invention is: providing an organic light-emitting diode panel, and the panel comprises: a processor, a storage device, a receiver and a display device, wherein, the processor is connected with the receiver and the display device; the receiver is used for obtaining a brightness to be displayed corresponding to each pixel in a booting process; the processor is used for comparing the brightness to be displayed of each pixel with a preset brightness threshold; if a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold; and the display is used for using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display.
The advantageous effect of the present invention is: comparing with the conventional art, in the present invention, obtaining a brightness to be displayed corresponding to each pixel in a booting process first. Then, comparing the brightness to be displayed of each pixel with a preset brightness threshold. If a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold. Then, using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display. Accordingly, the brightness of the picture is decreased in the booting process in order to reduce the probability of the image sticking of the panel caused by too large voltage offset when booting, decreasing too fast ageing of the panel device because of too large local current.
With reference to
S101: obtaining a brightness to be displayed corresponding to each pixel in a booting process.
In a normal situation, during a booting period of an OLED panel, the pixels will not emit light simultaneously. Generally, a portion of the pixels will emit light first, and the other portion of the pixels will emit light soon after. If a brightness to be displayed of the portion of the pixel that emit light first is too high, a brightness of a portion region of the OLED panel is too high, which means that a current of the portion region of the OLED panel is too high so that an offset of a voltage for driving the TFT is too large in order to cause an ageing of the device of the OLED panel to be faster or to be burned, and generating an image sticking phenomenon on the OLED panel. The image sticking phenomenon means a residual image on the display. That is, when switching images on the display, a previous image will not disappear immediately, the visual effect of the previous image will appear simultaneously with a second image, and the previous image will disappear slowly.
Therefore, in the present embodiment, controlling a brightness to be displayed of a portion of the pixels that will emit light first, that is, controlling currents of the portion of the pixels.
S102: comparing the brightness to be displayed of each pixel with a preset brightness threshold.
Wherein, the preset brightness threshold is a critical brightness value of an OLED panel that will not generate a sticking image. During a booting period, the brightness to be displayed of each pixel is compared with the preset brightness threshold.
S103: If the brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold.
Wherein, one of specific embodiments for the step of adjusting the brightness to be displayed to be less than or equal to the brightness threshold is shown as following:
Through a following formula to adjust a brightness to be displayed:
Y′out=Y′×K;
wherein, K=Yth/Y′max, Y′ is a brightness to be displayed before adjustment, Y′out is a brightness to be displayed after adjustment, Yth is the brightness threshold, Y′max is a greatest brightness of the brightness to be displayed of the multiple pixels.
S104: using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display.
S105: if the brightness to be displayed is less than or equal to the brightness threshold, directly using the brightness to be displayed to control the corresponding pixel to perform a display.
Specifically, when the brightness to be displayed of the portion of the pixels which emits light first is less than or equal to the brightness threshold, directly using the brightness to be displayed to control the corresponding pixel to perform a display. If the brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold. In summary, in the booting period, the brightness to be displayed of each pixel should be less than or equal to the brightness threshold.
In the present embodiment, obtaining a brightness to be displayed corresponding to each pixel in a booting process first. Then, comparing the brightness to be displayed of each pixel with a preset brightness threshold. If a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold. Then, using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display. Accordingly, the brightness of the picture is decreased in the booting process in order to reduce the probability of the image sticking of the panel caused by too large voltage offset when booting, decreasing too fast ageing of the panel device because of too large local current.
With reference to
S201: obtaining a grayscale value to be displayed corresponding to each pixel.
Wherein, because data outputted from a front end is the grayscale values of the pixels, the step of obtaining a grayscale value to be displayed corresponding to each pixel is required first. Then, calculating the grayscale value to be displayed corresponding to each pixel as the brightness to be displayed corresponding to each pixel. The specific calculation process is as following:
S202: obtaining a greatest grayscale value to be displayed in grayscale values to be displayed of different base colors corresponding to the multiple pixels.
Wherein, the different base colors corresponding to the multiple pixels are specifically Red/Green/Blue (R/GB). That is, obtaining a base color that has the greatest grayscale value to be displayed in R/G/B.
S203: performing a gamma correction for the greatest grayscale value to be displayed.
Wherein, the gamma correction is editing the gamma curve of an image, and performing a non-linear hue editing to detect a dark color portion and a light color portion in the image signal, and increasing a ratio of the both in order to increase a contrast of the image. That is, the main purpose of the gamma correction is to increase a contrast of the grayscale value to be displayed. The step of performing a gamma correction for the grayscale value to be displayed is specific as following:
Through a following formula to perform the gamma correction for the greatest grayscale value to be displayed:
Y′=(Y/N)GMA×N;
wherein, Y is the greatest grayscale value to be displayed before the gamma correction, Y′ is the greatest grayscale value to be displayed after the gamma correction, GMA is a gamma coefficient of the OLED panel, N is a greatest allowable grayscale value of the OLED panel.
S204: using the greatest grayscale value to be displayed after the gamma correction as the brightness to be displayed corresponding to the pixel.
S205: comparing a brightness to be displayed of each pixel to a preset brightness threshold.
As the description at the above S102, no more repeating here.
S206: adjusting a brightness to be displayed of each pixel to be less than or equal to the preset brightness threshold.
Wherein, if the brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold, if a brightness to be displayed is less than or equal to the brightness threshold, directly using the brightness to be displayed to control a corresponding pixel to perform a display.
S207: using the brightness to be displayed after adjusting to adjust a grayscale value to be displayed of a pixel.
S208: using the grayscale value to be displayed after adjusting to control a corresponding pixel to perform a display.
In a specific application field, as shown in
Wherein, the video signal inputted from the module 31 is grayscale values to be displayed of pixels. Therefore, in the above embodiment, requiring processing the grayscale values to be displayed of the pixels, after being transformed as a brightness to be displayed, comparing with the preset brightness threshold.
Wherein, LVDS (Low-Voltage Differential Signaling) is a signal transmitting mode, and is a voltage level standard. The core of the technology is adopting an ultra-low voltage amplitude to differentially transmit signal in a high speed in order to achieve a connection of one point to one point or one point to multiple point, which has features of low power consumption, low error code rate, low crosstalk and low radiation. The transmission medium can be a PCB connection line made of copper or a balance cable. The LVDS technology is used for simple physical layer device of simple line driver or receiver, and communication chip having more complicated ports. Wherein, the difference between LVDS and mLVDS is that an arrangement way of the output data is different.
Wherein, the module 33, the brightness detection control, is also the above embodiment.
Besides, the output signal of the module 38, TCON_ctrl, is transmitted to the scanning line of the panel, the output signal of the module 39, mLVDS, is transmitted to the data line of the panel.
In the present embodiment, obtaining a brightness to be displayed corresponding to each pixel in a booting process first. Then, comparing the brightness to be displayed of each pixel with a preset brightness threshold. If a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold. Then, using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display. Accordingly, the brightness of the picture is decreased in the booting process in order to reduce the probability of the image sticking of the panel caused by too large voltage offset when booting, decreasing too fast ageing of the panel device because of too large local current.
With reference to
S401: obtaining a brightness to be displayed corresponding to each pixel in a booting process.
As the description in the S101, no more repeating.
S402: adjusting the brightness to be displayed of each pixel to be not greater than a preset brightness threshold.
Specifically, comparing the brightness to be displayed of each pixel with a preset brightness threshold. If a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold; if a brightness to be displayed is less than or equal to the brightness threshold, directly using the brightness to be displayed to control a corresponding pixel to perform a display.
S403: using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display.
S404: gradually increasing the brightness threshold with time.
Wherein, after the step of gradually increasing the brightness threshold with time, the system will return to the step S401.
Wherein, after the booting period, the brightness to be displayed will gradually increase with the increasing of the brightness threshold. Specifically, according to brightness thresholds which are preset and corresponding to different moments to calculate a brightness threshold of a present moment through an interpolation method. Furthermore, after a preset moment, setting the brightness threshold to be greater than or equal to an allowable maximum brightness of the OLED panel.
In two application field, as shown in
In the present embodiment, obtaining a brightness to be displayed corresponding to each pixel in a booting process first. Then, comparing the brightness to be displayed of each pixel with a preset brightness threshold. If a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold. Then, using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display. Accordingly, the brightness of the picture is decreased in the booting process in order to reduce the probability of the image sticking of the panel caused by too large voltage offset when booting, decreasing too fast ageing of the panel device because of too large local current.
With reference to
In the present embodiment, the processing device includes: a processor 71, a storage device 72 coupled with the processor 71, a receiver 73 and a display device 74.
The storage device 72 is used for storing an operation system, instructions for the processor 71, and received news.
The receiver 73 is used for obtaining a brightness to be displayed corresponding to each pixel in a booting process.
The display 74 is used for using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display.
The processor 71 is used for comparing the brightness to be displayed of each pixel with a preset brightness threshold; if a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold.
The processor 71 is also used for obtaining a grayscale value to be displayed corresponding to each pixel; calculating the brightness to be displayed corresponding to each pixel according to the grayscale value to be displayed.
Wherein, the processor 71 is also used for obtaining a greatest grayscale value to be displayed in grayscale values to be displayed of different base colors corresponding to the multiple pixels; performing a gamma correction for the greatest grayscale value to be displayed; and using the greatest grayscale value to be displayed after the gamma correction as the brightness to be displayed corresponding to the pixel.
Specifically, the processor 71 is also used for through a following formula to perform the gamma correction for the greatest grayscale value to be displayed:
Y′=(Y/N)GMA×N;
wherein, Y is the greatest grayscale value to be displayed before the gamma correction, Y′ is the greatest grayscale value to be displayed after the gamma correction, GMA is a gamma coefficient of the OLED panel, N is a greatest allowable grayscale value of the OLED panel.
Specifically, the processor 71 is also used for through a following formula to adjust a brightness to be displayed:
Y′out=Y′×K;
wherein, K=Yth/Y′max, Y′ is a brightness to be displayed before adjustment, Y′out is a brightness to be displayed after adjustment, Yth is the brightness threshold, Y′max is a greatest brightness of the brightness to be displayed of the multiple pixels.
Specifically, the processor 71 is also using the brightness to be displayed after adjusting to adjust a grayscale value to be displayed of the pixel; using the grayscale value to be displayed to control a corresponding pixel to perform a display
Wherein, the processor 71 is used for gradually increasing the brightness threshold with time.
Specifically, the processor 71 is used for according to brightness thresholds which are preset and corresponding to different moments to calculate a brightness threshold of a present moment through an interpolation method.
Specifically, the processor 71 is used for after a preset moment, setting the brightness threshold to be greater than or equal to an allowable maximum brightness of the organic light-emitting diode panel.
In the present embodiment, obtaining a brightness to be displayed corresponding to each pixel in a booting process first. Then, comparing the brightness to be displayed of each pixel with a preset brightness threshold. If a brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold. Then, using the brightness to be displayed after adjusting to control a corresponding pixel to perform a display. Accordingly, the brightness of the picture is decreased in the booting process in order to reduce the probability of the image sticking of the panel caused by too large voltage offset when booting, decreasing too fast ageing of the panel device because of too large local current.
The above embodiments of the present invention are not used to limit the claims of this invention. Any use of the content in the specification or in the drawings of the present invention which produces equivalent structures or equivalent processes, or directly or indirectly used in other related technical fields is still covered by the claims in the present invention.
Number | Date | Country | Kind |
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2017 1 0301471 | May 2017 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2017/086231 | 5/27/2017 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/201541 | 11/8/2018 | WO | A |
Number | Name | Date | Kind |
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20050068345 | Obata | Mar 2005 | A1 |
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102377956 | Mar 2012 | CN |
105632414 | Jun 2016 | CN |
106033666 | Oct 2016 | CN |
106227425 | Dec 2016 | CN |
Number | Date | Country | |
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20180357949 A1 | Dec 2018 | US |