CN109754752B - Display panel brightness adjusting device and method - Google Patents
Display panel brightness adjusting device and method Download PDFInfo
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Abstract
The invention relates to a display panel brightness adjusting device and method. The display panel brightness adjusting device includes: an average image level module; a temperature detection module; the energy-saving configuration module is used for configuring the starting time parameter and the ending time parameter of the energy-saving mode according to the temperature value; the static time calculation module is used for judging whether the picture is in a static state or not according to whether the average image level value changes or not; if the static picture is available, timing is started, and when the time meets the initial time of the energy-saving mode, the energy-saving mode is started; the brightness adjusting coefficient module is used for calculating the slope of a brightness adjusting curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve; and the brightness adjusting module is used for adjusting the brightness according to the brightness adjusting coefficient. The invention also provides a corresponding display panel brightness adjusting method. The brightness adjusting device and method of the display panel can prolong the service life and improve the uniformity of the panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel brightness adjusting device and method.
Background
Organic Light Emitting Diode (OLED) display devices have many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, and wide temperature range, and are considered to be the most promising display devices in the industry.
The OLED display panel may be classified into two broad categories, i.e., a Passive Matrix OLED (PMOLED) and an Active Matrix OLED (AMOLED), according to a driving manner. The AMOLED panel has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used for a large-sized display device with high definition.
Although the advantages of the OLED device are outstanding, there are also disadvantages of high power consumption and easy aging. At present, aiming at the problems of aging and power consumption of OLED devices, one of common solutions is as follows: because the average image level (APL) can reflect the brightness degree of the picture, an average image level algorithm is applied to judge whether the picture statically displays the same image for a long time according to whether the average image level of the displayed picture changes, if so, the energy-saving mode is entered, and the brightness is gradually reduced by adjusting a data signal, a gamma voltage or an OLED voltage until a preset value is reached, so that the purposes of reducing the power consumption of the OLED and slowing down the aging of the OLED are achieved.
On the other hand, as the temperature increases, the threshold voltage Vth of a driving Thin Film Transistor (TFT) in the pixel driving circuit decreases and the mobility u increases; according to a current calculation formula: i ═1/2*u*W/L*(Vgs–Vth)2It is known that the current flowing through the TFT device becomes large with increasing temperature under the same conditions.
Therefore, when the panel is used in a higher temperature environment, the aging of the device is accelerated, and the service life of the panel is shortened. Due to the difference between the mobility u and the threshold voltage Vth of the tft caused by temperature variation, the display uniformity of the panel will be affected.
Referring to fig. 1, a time-luminance relationship diagram of a conventional energy-saving method is shown. By using the average image level algorithm, the static display of the picture (no matter the temperature) is detected, when the picture is continuously displayed for a period of time (0-X1), the energy-saving mode is entered, the brightness starts to linearly decrease (within the time period from X1 to X2), and the brightness does not change after reaching the specified value (after X2).
Although the above mentioned power saving mode method reduces the brightness of the picture and reduces the power consumption, there is a drawback: no matter the difference of the ambient temperature or the temperature of the panel is increased, the energy-saving mode is entered at the same time point, and the brightness is reduced at the same speed. The effect of temperature then still exacerbates the lifetime and uniformity problems.
Disclosure of Invention
Therefore, an object of the present invention is to provide a display panel brightness adjusting apparatus and method, which can alleviate the problems of panel lifetime and display uniformity at high temperature.
In order to achieve the above object, the present invention provides a display panel luminance adjusting apparatus, comprising:
an average picture level module for calculating an average picture level value of the picture;
the temperature detection module is used for detecting the temperature value of the current environment of the panel;
the energy-saving configuration module is used for configuring the starting time parameter and the ending time parameter of the energy-saving mode according to the temperature value; transmitting the initial time parameter to a static time calculation module, and transmitting the cut-off time parameter to a brightness adjustment coefficient module;
the static time calculation module is used for judging whether the picture is in a static state or not according to whether the average image level value changes or not; if the static picture is available, timing is started, and when the time meets the initial time of the energy-saving mode, the energy-saving mode is started;
the brightness adjusting coefficient module is used for calculating the slope of a brightness adjusting curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve;
and the brightness adjusting module is used for adjusting the brightness according to the brightness adjusting coefficient.
The temperature detecting module obtains the temperature value of the current environment of the panel by acquiring data of the temperature sensor arranged on the panel.
The temperature sensors comprise two temperature sensors which are respectively arranged on a left X plate and a right X plate of the panel.
The temperature value of the current environment is set as the maximum value of the detection results of the two temperature sensors.
The temperature value of the current environment is set as an average value of detection results of the two temperature sensors.
The energy-saving configuration module stores a lookup table of the initial time parameter and the deadline parameter of the energy-saving mode at different temperature values in advance, and can configure the initial time parameter and the deadline parameter of the energy-saving mode through a lookup mode.
And the energy-saving configuration module calculates the initial time parameter and the deadline time parameter of the energy-saving mode according to the temperature value and a preset algorithm.
The brightness adjusting module adjusts brightness by adjusting the data signal, the gamma voltage and/or the voltage of the organic light emitting diode according to the brightness adjusting coefficient.
The invention also provides a display panel brightness adjusting method, which comprises the following steps:
the average image level module calculates an average image level value of the image;
the temperature detection module detects the temperature value of the current environment of the panel;
the energy-saving configuration module configures an initial time parameter and a cut-off time parameter of an energy-saving mode according to the temperature value; transmitting the initial time parameter to a static time calculation module, and transmitting the cut-off time parameter to a brightness adjustment coefficient module;
the static time calculation module judges whether the picture is in a static state or not according to whether the average image level value changes or not; if the static picture is available, timing is started, and when the time meets the initial time of the energy-saving mode, the energy-saving mode is started;
the brightness adjusting coefficient module receives the cut-off time parameter transmitted by the energy-saving configuration module and calculates the slope of a brightness adjusting curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve;
and the brightness adjusting module adjusts the brightness according to the brightness adjusting coefficient.
In summary, the brightness adjusting device and method of the display panel of the invention can improve the service life and uniformity of the panel.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a time-luminance relationship of a conventional energy-saving method;
FIG. 2 is a schematic diagram of a panel layout of a display panel brightness adjusting apparatus according to a preferred embodiment of the present invention;
FIG. 3 is a block diagram of a display panel brightness adjusting apparatus according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the operation of a display panel brightness adjusting apparatus according to a preferred embodiment of the present invention.
Detailed Description
Referring to fig. 2, which is a schematic diagram of a panel layout of a display panel brightness adjusting apparatus according to a preferred embodiment of the present invention, a temperature sensor 3 is respectively disposed on a left X-board (X-base) 2 and a right X-board (X-base) 2 of a panel 1 for detecting a current ambient temperature value of the panel 1. The two temperature sensors 3 respectively obtain a detection result, and the temperature value of the current environment may be set as the maximum value of the detection results of the two temperature sensors 3, or may be set as the average value of the detection results of the two temperature sensors 3, or more temperature sensors 3 may be optionally set and other detection algorithms may be adopted. The temperature value of the current environment can be transmitted to the control board (C-board)4, and the start time and the end time of the energy saving mode are adjusted according to the temperature value.
According to the invention, the temperature sensor 3 is used for detecting the temperature value, the effect of the energy-saving mode is modified according to the temperature value, the energy-saving mode is started in advance or the adjusting force of the energy-saving mode is increased, the brightness is reduced until the preset value is reached, and therefore, the purposes of reducing the power consumption of the OLED and slowing down the aging of the OLED are achieved, and the influence brought by high temperature is slowed down.
Referring to fig. 3, which is a block diagram of a display panel brightness adjusting device according to a preferred embodiment of the present invention, the display panel brightness adjusting device mainly includes:
an average picture level module 10 for calculating an average picture level value of the picture; an average picture level value is calculated from the unadjusted initial picture data RGB.
The temperature detection module 20 is used for detecting the temperature value of the current environment of the panel; data of the temperature sensor is acquired to obtain a temperature value of the current environment, and the configuration of the temperature sensor can be referred to fig. 2.
The energy-saving configuration module 30 is used for configuring the starting time parameter and the ending time parameter of the energy-saving mode according to the temperature value; the start time parameter is transmitted to the static time calculation module 40, and the cut-off time parameter is transmitted to the brightness adjustment coefficient module 50;
the energy saving configuration module 30 may also be configured to calculate the start time parameter and the deadline parameter of the energy saving mode in real time according to a preset algorithm according to the temperature value. The initial time parameter and the deadline time parameter of the energy-saving mode calculated according to a preset algorithm can also be made into a lookup table;
the energy-saving configuration module 30 may be configured as a lookup table in which the start time parameter and the deadline parameter of the energy-saving mode at different temperature values are pre-stored, so that the start time parameter and the deadline parameter of the energy-saving mode can be configured by a lookup manner.
Referring to fig. 4, which is a schematic diagram illustrating an operation principle of a display panel brightness adjusting apparatus according to a preferred embodiment of the present invention, an adjusting process of the display panel brightness adjusting apparatus according to the present invention is shown by a time-brightness relationship. The energy saving configuration module 30 determines the current temperature, and adjusts the start time (X1) and the stop time (X2) of entering the energy saving mode according to the temperature difference. The temperature difference is small, the curve l1 is selected, and the energy-saving mode is entered in advance. The temperature difference is large, the curve l2 is selected, the energy-saving mode is entered in advance, and the brightness reduction rate is increased.
A static time calculation module 40 for judging whether the picture is in a static state by whether the average picture level value is changed; and if the static picture is the static picture, starting timing, and starting the energy-saving mode when the time meets the initial time of the energy-saving mode.
A brightness adjustment coefficient module 50, configured to receive the cut-off time parameter transmitted by the energy-saving configuration module 30, and calculate a slope of a brightness adjustment curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve; the slope of the brightness adjustment curve can be obtained by referring to fig. 4, and then the corresponding brightness adjustment coefficient can be obtained according to the brightness of the panel at the current time.
A brightness adjusting module 60 for adjusting brightness according to the brightness adjusting coefficient; the brightness adjusting module 60 adjusts the brightness according to the brightness adjusting coefficient by adjusting the data signal, the gamma voltage, the OLED voltage, and the like, to obtain the adjusted image data R ' G ' B '.
Based on the display panel brightness adjusting device, the invention also provides a corresponding display panel brightness adjusting method, which mainly comprises the following steps:
the average image level module calculates an average image level value of the image;
the temperature detection module detects the temperature value of the current environment of the panel;
the energy-saving configuration module configures an initial time parameter and a cut-off time parameter of an energy-saving mode according to the temperature value; transmitting the initial time parameter to a static time calculation module, and transmitting the cut-off time parameter to a brightness adjustment coefficient module;
the static time calculation module judges whether the picture is in a static state or not according to whether the average image level value changes or not; if the static picture is available, timing is started, and when the time meets the initial time of the energy-saving mode, the energy-saving mode is started;
the brightness adjusting coefficient module receives the cut-off time parameter transmitted by the energy-saving configuration module and calculates the slope of a brightness adjusting curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve;
and the brightness adjusting module adjusts the brightness according to the brightness adjusting coefficient.
In summary, the brightness adjusting device and method of the display panel of the invention can improve the service life and uniformity of the panel.
As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.
Claims (9)
1. A display panel brightness adjusting apparatus includes an average picture level module for calculating an average picture level value of a picture; the temperature detection module is used for detecting the temperature value of the current environment of the panel; it is characterized by comprising:
the energy-saving configuration module is used for configuring the starting time parameter and the ending time parameter of the energy-saving mode according to the temperature value; transmitting the initial time parameter to a static time calculation module, and transmitting the cut-off time parameter to a brightness adjustment coefficient module;
the static time calculation module is used for judging whether the picture is in a static state or not according to whether the average image level value changes or not; if the static picture is available, timing is started, and when the time meets the initial time of the energy-saving mode, the energy-saving mode is started;
the brightness adjusting coefficient module is used for calculating the slope of a brightness adjusting curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve;
and the brightness adjusting module is used for adjusting the brightness according to the brightness adjusting coefficient.
2. The apparatus of claim 1, wherein the temperature detecting module obtains a temperature value of a current environment of the panel by obtaining data of a temperature sensor disposed on the panel.
3. The display panel luminance adjusting apparatus of claim 2, wherein the temperature sensor includes two temperature sensors respectively provided on left and right X plates of the panel.
4. The apparatus according to claim 3, wherein the current ambient temperature is set to a maximum value of the detection results of the two temperature sensors.
5. The apparatus of claim 3, wherein the temperature value of the current environment is set as an average of the detection results of the two temperature sensors.
6. The apparatus of claim 1, wherein the energy-saving configuration module pre-stores a lookup table of start time parameters and end time parameters of the energy-saving mode at different temperature values, and is capable of configuring the start time parameters and the end time parameters of the energy-saving mode by a lookup manner.
7. The apparatus of claim 1, wherein the energy-saving configuration module calculates a start time parameter and an end time parameter of the energy-saving mode according to a preset algorithm based on the temperature value.
8. The display panel brightness adjustment apparatus of claim 1, wherein the brightness adjustment module performs brightness adjustment by adjusting the data signal, the gamma voltage, and/or the organic light emitting diode voltage according to a brightness adjustment coefficient.
9. A display panel brightness adjustment method includes calculating an average picture level value of an image by an average picture level module; the temperature detection module detects the temperature value of the current environment of the panel; it is characterized by comprising:
the energy-saving configuration module configures an initial time parameter and a cut-off time parameter of an energy-saving mode according to the temperature value; transmitting the initial time parameter to a static time calculation module, and transmitting the cut-off time parameter to a brightness adjustment coefficient module;
the static time calculation module judges whether the picture is in a static state or not according to whether the average image level value changes or not; if the static picture is available, timing is started, and when the time meets the initial time of the energy-saving mode, the energy-saving mode is started;
the brightness adjusting coefficient module receives the cut-off time parameter transmitted by the energy-saving configuration module and calculates the slope of a brightness adjusting curve; starting timing after the energy-saving mode is started, and calculating a corresponding brightness adjustment coefficient according to the slope of the time and brightness adjustment curve;
and the brightness adjusting module adjusts the brightness according to the brightness adjusting coefficient.
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| CN110277061B (en) * | 2019-06-21 | 2021-07-23 | 深圳市华星光电半导体显示技术有限公司 | Method for adjusting panel brightness of organic light emitting display and control circuit |
| CN110890063B (en) * | 2019-11-22 | 2021-10-08 | 深圳市华星光电半导体显示技术有限公司 | Method and device for reducing power consumption of display panel |
| CN111627384B (en) * | 2020-05-14 | 2022-09-09 | 深圳市华星光电半导体显示技术有限公司 | Display picture compensation method and device, electronic equipment and storage medium |
| CN112037711A (en) | 2020-09-11 | 2020-12-04 | 京东方科技集团股份有限公司 | Driving device and driving method of display panel and display device |
| CN112133252B (en) * | 2020-11-03 | 2021-08-17 | 安徽熙泰智能科技有限公司 | Temperature compensation method and system for display brightness |
| CN112599095B (en) * | 2020-12-31 | 2021-10-15 | 南京国兆光电科技有限公司 | OLED micro-display brightness compensation method and system based on temperature feedback |
| TWI774319B (en) | 2021-04-13 | 2022-08-11 | 華碩電腦股份有限公司 | Electronic device and display panel control method thereof |
| CN113205774A (en) * | 2021-04-30 | 2021-08-03 | 深圳创维－Rgb电子有限公司 | Method and device for preventing ghost shadow of channel of OLED screen body, display equipment and medium |
| US20240169907A1 (en) * | 2021-07-21 | 2024-05-23 | Hefei Boe Joint Technology Co.,Ltd. | Control Device and Driving Method therefor, and Display Device |
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| US20050248517A1 (en) * | 2004-05-05 | 2005-11-10 | Visteon Global Technologies, Inc. | System and method for luminance degradation reduction using thermal feedback |
| KR102231046B1 (en) * | 2015-05-28 | 2021-03-23 | 엘지디스플레이 주식회사 | Display device and method for driving the same |
| KR102412107B1 (en) * | 2015-10-29 | 2022-06-24 | 엘지디스플레이 주식회사 | Luminance control device and display device including the same |
| US10297191B2 (en) * | 2016-01-29 | 2019-05-21 | Samsung Display Co., Ltd. | Dynamic net power control for OLED and local dimming LCD displays |
| CN105895056B (en) * | 2016-06-17 | 2017-04-19 | 京东方科技集团股份有限公司 | Method for establishing luminance compensation model and screen luminance compensation method and screen luminance compensation device |
| CN107610676A (en) * | 2017-09-27 | 2018-01-19 | 上海展扬通信技术有限公司 | The screen brightness control method and screen intensity control system of a kind of intelligent terminal |
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| CN108665858A (en) * | 2018-07-14 | 2018-10-16 | 芜湖益浩昌智能设备有限公司 | A kind of liquid crystal display of adaptive adjustment backlight |
| CN108962164A (en) * | 2018-07-14 | 2018-12-07 | 芜湖益浩昌智能设备有限公司 | A kind of adaptive display brightness adjustment device |
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