CN113112939B - Voltage compensation method and device for display device and display device - Google Patents
Voltage compensation method and device for display device and display device Download PDFInfo
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- CN113112939B CN113112939B CN202110361018.4A CN202110361018A CN113112939B CN 113112939 B CN113112939 B CN 113112939B CN 202110361018 A CN202110361018 A CN 202110361018A CN 113112939 B CN113112939 B CN 113112939B
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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
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Abstract
The application provides a voltage compensation method and device of a display device and the display device, wherein the display device comprises a display screen, a screen driving board and a power management integrated circuit, and the display screen comprises at least one photosensitive sensor and a public voltage compensation circuit; the screen driving board is respectively and electrically connected with the photosensitive sensor and the power management integrated circuit, the power management integrated circuit is electrically connected with the public voltage compensation circuit, and the voltage compensation method of the display device comprises the steps that when the display screen is in a bright screen state, sampling signals corresponding to display brightness in the display screen are detected through the photosensitive sensor, and the sampling signals are sent to the screen driving board; when the sampling signal meets the preset condition, the screen driving board controls the power management integrated circuit to start the public voltage compensation circuit so as to compensate the public voltage of the display screen, and the flicker phenomenon can be quickly and effectively improved when the flicker occurs through carrying out voltage compensation on the public voltage, so that the stable quality of the display device is ensured.
Description
[ field of technology ]
The application relates to the technical field of display, in particular to a voltage compensation method and device of a display device and the display device.
[ background Art ]
Currently, with the increasing market demand for game monitors (Gaming monitors), there are more demands for high resolution, high refresh rate, and other directions, and at the same time, the demands of clients in the high-end market for display panels are also increasing.
In the use process of the display panel, horizontal stripes are generated due to polarity switching of the common electrode signal, which is generally called a flicker (flicker) phenomenon. The magnitude of the flicker value also directly reflects the quality reliability of the panel. Generally, the smaller the value of the flicker value, the smaller the risk of the panel generating Image Sticking (IS), and conversely, the greater the risk. Therefore, improvement of the flicker phenomenon is required to ensure stable quality of the display panel.
Accordingly, the prior art has drawbacks and needs to be improved and developed.
[ application ]
The embodiment of the application provides a voltage compensation method and device for a display device and the display device, which can effectively improve the flicker phenomenon of the display device so as to ensure the stable quality of the display device.
In order to solve the above problems, the present application provides a display device, including a display screen, the display screen including at least one photosensor and a common voltage compensation circuit, the photosensor being configured to detect a change in display brightness of the display screen, and obtain a sampling signal; the display device further comprises a screen driving board and a power management integrated circuit, wherein the screen driving board is respectively and electrically connected with the photosensitive sensor and the power management integrated circuit, the power management integrated circuit is electrically connected with the public voltage compensation circuit, and the screen driving board is used for receiving sampling signals and controlling the power management integrated circuit to start the public voltage compensation circuit according to the sampling signals.
The display device further comprises a switch control circuit, the screen driving board is electrically connected with the power management integrated circuit through the switch control circuit, and the power management integrated circuit is specifically used for:
when the screen driving board controls the switch control circuit to input a high-level signal to the power management integrated circuit, the common voltage compensation circuit is started;
when the screen driving board controls the switch control circuit to input a low-level signal to the power management integrated circuit, the common voltage compensation circuit is not started.
The display screen also comprises a public electrode and a public voltage circuit, wherein the public electrode is respectively and electrically connected with the public voltage compensation circuit and the public voltage circuit, and the public voltage compensation circuit is used for carrying out voltage compensation on the public voltage of the public electrode.
In order to solve the above problems, an embodiment of the present application further provides a voltage compensation method of a display device, where the display device includes a display screen, a screen driving board, and a power management integrated circuit, and the display screen includes at least one photosensitive sensor and a common voltage compensation circuit; the screen driving board is respectively and electrically connected with the photosensitive sensor and the power management integrated circuit, the power management integrated circuit is electrically connected with the public voltage compensation circuit, and the voltage compensation method of the display device comprises the following steps:
when the display screen is in a bright screen state, detecting a sampling signal corresponding to display brightness in the display screen through a photosensitive sensor, and sending the sampling signal to a screen driving plate;
when the sampling signal meets the preset condition, the power management integrated circuit is controlled by the screen driving board to start the public voltage compensation circuit so as to compensate the public voltage of the display screen.
Wherein after sending the sampling signal to the screen driving board, further comprising:
determining a signal variation according to the signal values of the sampling signals detected twice, wherein the signal variation comprises a current variation or a voltage variation;
when the signal variation is out of the range of the preset reference value, judging that the sampling signal meets the preset condition;
when the signal variation is within the preset reference value range, the sampling signal is judged to not meet the preset condition.
The display device further comprises a switch control circuit, the screen driving board is electrically connected with the power management integrated circuit through the switch control circuit, and the power management integrated circuit is controlled by the screen driving board to start the public voltage compensation circuit, and the display device comprises:
the switch control circuit is controlled by the screen driving board to input a high-level signal to the power management integrated circuit, so that the power management integrated circuit starts the public voltage compensation circuit according to the high-level signal.
Wherein after sending the sampling signal to the screen driving board, further comprising:
when the sampling signal does not meet the preset condition, the screen driving board controls the switch control circuit to input a low-level signal to the power management integrated circuit, so that the power management integrated circuit does not start the public voltage compensation circuit according to the low-level signal.
In order to solve the above problems, an embodiment of the present application further provides a voltage compensation device, which is applied to a display device, wherein the display device includes a display screen, a screen driving board, and a power management integrated circuit, and the display screen includes at least one photosensitive sensor and a common voltage compensation circuit; the screen drive board is connected with photosensitive sensor and power management integrated circuit electricity respectively, and power management integrated circuit is connected with public voltage compensation circuit electricity, and voltage compensation arrangement includes:
the detection module is used for detecting sampling signals corresponding to display brightness in the display screen through the photosensitive sensor when the display screen is in a bright screen state, and sending the sampling signals to the screen driving plate;
and the adjusting module is used for controlling the power management integrated circuit to start the public voltage compensation circuit through the screen driving board when the sampling signal meets the preset condition so as to compensate the public voltage of the display screen.
Wherein, display device still includes control module, and control module is used for:
after the sampling signal is sent to the screen driving board, determining a signal variation according to the signal value of the sampling signal detected twice, wherein the signal variation comprises a current variation or a voltage variation;
when the signal variation is out of the range of the preset reference value, judging that the sampling signal meets the preset condition;
when the signal variation is within the preset reference value range, the sampling signal is judged to not meet the preset condition.
The display device further comprises a switch control circuit, the screen driving plate is electrically connected with the power management integrated circuit through the switch control circuit, and the adjusting module is specifically used for:
when the sampling signal meets the preset condition, the screen driving board controls the switch control circuit to input a high-level signal to the power management integrated circuit, so that the power management integrated circuit starts the public voltage compensation circuit according to the high-level signal.
Wherein, the adjustment module is further for:
when the sampling signal does not meet the preset condition, the screen driving board controls the switch control circuit to input a low-level signal to the power management integrated circuit, so that the power management integrated circuit does not start the public voltage compensation circuit according to the low-level signal.
The beneficial effects of the application are as follows: compared with the prior art, the application provides a voltage compensation method and device for a display device and the display device, wherein the display device comprises a display screen, a screen driving plate and a power management integrated circuit, wherein the display screen comprises at least one photosensitive sensor and a public voltage compensation circuit, the photosensitive sensor for detecting the display brightness change of the display screen is arranged in the display screen, and the screen driving plate controls the power management integrated circuit to start the public voltage compensation circuit according to a sampling signal sent by the photosensitive sensor so as to perform voltage compensation on a public voltage value, so that the flickering phenomenon of the display screen can be accurately detected, the flickering phenomenon can be quickly and effectively improved when the display screen flickering occurs, the display effect of the display device is optimized, and the quality stability of the display device is further ensured.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a frame of a display device according to an embodiment of the present application;
fig. 2 is a schematic diagram of another frame of the display device according to the embodiment of the application;
FIG. 3 is a schematic diagram of another frame of a display device according to an embodiment of the present application;
FIG. 4 is a schematic flow chart of a voltage compensation method according to an embodiment of the present application;
FIG. 5 is a schematic flow chart of another voltage compensation method according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a voltage compensation device according to an embodiment of the present application.
[ detailed description ] of the application
The application is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present application, but do not limit the scope of the present application. Likewise, the following examples are only some, but not all, of the examples of the present application, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present application.
In addition, in the respective drawings, units having similar structures are denoted by the same reference numerals. When an element is referred to as being "connected to" another element, it can be directly connected or be indirectly connected to the other element through an intervening element. For clarity, the various features of the drawings are not drawn to scale. Furthermore, some well-known portions may not be shown in the drawings.
The present application will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent.
As shown in fig. 1, an embodiment of the present application provides a display device 100, including a display screen 110, where the display screen 110 includes at least one photosensor 111 and a common voltage compensation circuit 112, and the photosensor 111 is used to detect a change in display brightness of the display screen 110, and obtain a sampling signal; the display device 100 further includes a panel driving board 120 and a power management integrated circuit 130, the panel driving board 120 is electrically connected to the photosensor 111 and the power management integrated circuit 130, the power management integrated circuit 130 is electrically connected to the common voltage compensation circuit 112, and the panel driving board 120 is configured to receive the sampling signal and control the power management integrated circuit 130 to turn on the common voltage compensation circuit 112 according to the sampling signal.
The display device 100 generally includes a display screen 110 for displaying information such as text and images, and when the display device 100 displays information such as text and images, a flickering phenomenon occurs. The flicker phenomenon is generated because the liquid crystal molecules have a characteristic that they cannot be fixed at a certain voltage at all times, because the fixed voltage damages the polarity of the liquid crystal molecules for a long time. After a long time, even if the original voltage is cancelled, the polarity of the liquid crystal molecules is destroyed, and even if a different voltage is applied, the liquid crystal molecules cannot rotate due to the change of the voltage, so that different gray scales cannot be formed any more. When the voltage value of the pixel electrode is higher than the public voltage value, the pixel electrode is called positive voltage, when the voltage value of the pixel electrode is lower than the public voltage value, the pixel electrode is called negative voltage, in general, the voltage value of the pixel electrode periodically changes, the voltage value of the public electrode is fixed according to a set value, and periodic positive and negative voltages are applied to two ends of liquid crystal molecules so as to ensure that the liquid crystal molecules are not damaged, and meanwhile, the display image is kept unchanged. However, since the display screen 110 and its display circuit process have deviation, etc., the display brightness is not uniform due to the asymmetry of the positive and negative voltages, thereby generating a flicker phenomenon. Due to process variations and contact resistance loading (RC loading) of various parts of the display device 100, the flicker level of different areas of the same display panel 110 is different even if the same common voltage is applied. It is difficult to provide a uniform common voltage value to adjust each area to a flicker degree smaller than a preset threshold value, and brightness of each area of the display screen 110 is kept uniform by performing voltage compensation on the common voltage, so that a flicker phenomenon of the display device 100 is improved and a display effect of the display device 100 is optimized, thereby ensuring stable quality of the display device 100.
Specifically, the working principle of the photosensor 111 is based on the photoelectric effect, and a resistance, which is made of a semiconductor and has a resistance value that changes with the intensity of incident light, is generally used for light measurement, light control, and photoelectric conversion. For example, a high-precision photocell is installed in the photosensor 111, a small flat plate consisting of a needle-shaped tube is installed in the photocell, when a reverse fixed voltage is applied to two ends of the photocell, any light impact on the photocell will cause the photocell to release electrons, as a result, when the illumination intensity is higher, the current of the photocell is larger, the current at the moment can be collected, or the current passes through a resistor, the voltage at two ends of the resistor is converted into 0-5V voltage which can be received by a digital-analog converter of a collector, in short, the photosensor 111 is installed at a position where the light emitted by the display screen 110 can be received by utilizing the principle that the resistance value changes due to the influence of the light intensity, so that the change of the display brightness of the display screen 110 is detected, the change of the display brightness is converted into a sampling signal, and the sampling signal is sent to the screen driving board 120.
In addition, when the common voltage is adjusted, there often occurs a smaller flickering degree of the central region of the display screen 110, and a larger flickering degree of the surrounding region of the display screen 110; or the central area of the display screen 110 has a larger flicker degree and the surrounding area of the display screen 110 has a smaller flicker degree, a plurality of photosensitive sensors 111 may be disposed at the central area and the surrounding area of the display screen 110, respectively, to implement flicker detection for the central area and the surrounding area. When the photosensor 111 detects a sampling value of a specific region, the panel driving board 120 receives the sampling value and controls whether the power management integrated circuit 130 turns on the common voltage compensation circuit 112 according to the sampling value to perform common voltage compensation for the specific region.
As shown in fig. 2, which is another schematic diagram of a frame of a display device 200 according to an embodiment of the present application, the display device 200 further includes a switch control circuit 240, the panel driving board 220 is electrically connected to the power management integrated circuit 230 through the switch control circuit 240, and the power management integrated circuit 230 is specifically configured to:
when the screen driving board 220 controls the switch control circuit 240 to input a high level signal to the power management integrated circuit 230, the common voltage compensation circuit 212 is started;
when the panel driving board 220 controls the switch control circuit 240 to input a low level signal to the power management integrated circuit 230, the common voltage compensation circuit 212 is not activated.
Specifically, the screen driving board 220 is also called a Timing Control (TCON) to convert externally received data signals, control signals, and clock signals into data signals, control signals, and clock signals suitable for a data driving integrated circuit (Source-IC) and a scan driving integrated circuit (Gate-IC), so as to implement image display of the display screen 210. In addition, since the display screens 210 with different resolutions and the output control signals required by different operation modes are different, when the screen driving board 220 is operated, firstly, a judgment is made, and the correct operation mode is selected so as to generate the corresponding control signals, so that the screen driving board 220 can be used for judgment and control. Based on the operation principle of the photosensor 211, when the display screen 210 blinks, the display brightness irradiated on the photosensor 211 may be different, and accordingly, the sampling signal transmitted to the screen driving board 220 may be different. The sampling signal sent by the photosensor 211 received by the panel driving board 220 may be a current signal or a voltage signal, the signal variation is determined according to the electrical signals detected by two adjacent times, the signal variation includes the current variation or the voltage variation, when the signal variation is out of the range of the preset reference value, the electrical signal is determined to meet the preset condition, the panel driving board 220 generates an NG signal, the switch control circuit 240 is controlled to input a high level signal, i.e. a Power en=on signal, to the Power management integrated circuit 230, and at this time, the Power management integrated circuit 230 starts the common voltage compensation circuit 212 according to the high level signal; when the signal variation is within the preset reference value range, it is determined that the electrical signal does not satisfy the preset condition, the panel driving board 220 generates a PASS signal, and the switch control circuit 240 is controlled to input a low level signal, i.e., a Power en=off signal, to the Power management integrated circuit 230, and at this time, the Power management integrated circuit 230 does not activate the common voltage compensation circuit 212 according to the low level signal.
The switch control circuit 240 may be a voltage divider circuit, for example, when the panel driver board 220 generates an NG signal, it is assumed that the NG signal is a high level signal of 15V, and the power management integrated circuit 230 cannot directly receive the high level signal of 15V, for example, only can receive the high level signal of 3.3V, so that a switching of the level signal is required by the switch control circuit 240 to implement the communication between the panel driver board 220 and the power management integrated circuit 230, and at this time, the panel driver board 220 turns on the voltage divider circuit of the switch control circuit 240 to switch the high level signal of 15V to the high level signal of 3.3V, so that the power management integrated circuit 230 starts the common voltage compensation circuit 212 according to the high level signal; when the panel driver 220 generates a PASS signal, assuming that the PASS signal is a low level signal of 0V, the panel driver 220 turns off the voltage dividing circuit of the switch control circuit 240 and directly sends the low level signal of 0V to the power management integrated circuit 230, so that the power management integrated circuit 230 does not activate the common voltage compensating circuit 212 according to the low level signal.
As shown in fig. 3, in another schematic structural diagram of a display device 300 according to an embodiment of the present application, a display screen 310 further includes a common electrode (not shown in the figure) and a common voltage circuit 312, where the common electrode is electrically connected to the common voltage compensation circuit 312 and the common voltage circuit 313, respectively, and the common voltage compensation circuit 312 is used for performing voltage compensation on a common voltage of the common electrode.
Specifically, the Power Management integrated circuit 330 (PMIC) is a core part of a Power supply required for driving the display screen 310, and integrates a plurality of dc-dc conversion circuits with different circuit functions, each of which outputs a different voltage value. The power management integrated circuit 330 mainly has functions of providing digital operating voltages for ICs on the panel driving board 320, data driving integrated circuits (Source-ICs) and scan driving integrated circuits (Gate-ICs) on the display panel, providing Gate voltages for turning on and off of the thin film transistors (Thin Film Transistor, TFTs), providing reference voltages for Gamma (Gamma) circuits, and providing a common voltage (Vcom) for the common electrode of the display panel 310. The common voltage circuit, also called VCOM circuit, is electrically connected to the power management integrated circuit 330 and the common electrode, respectively, and provides a common voltage to the common electrode through the power management integrated circuit 330. In general, the common electrode is a monolithic planar electrode, and the common voltage value of each area of the display screen 310 is the same, and the common voltage value of the common electrode can be set by the screen driving board 320, so that the common voltage is the optimal common voltage value (Best Vcom), so as to reduce the flicker phenomenon of the whole display area. In addition, the power management integrated circuit 330 may also supply power to the common voltage compensation circuit 312, and may also control whether to turn on the common voltage compensation circuit 312, where the common voltage compensation circuit 312 is configured to provide a compensated common voltage value to the common voltage of the common electrode to improve the flicker phenomenon in a specific area.
Based on the display device described in the above embodiment, the embodiment of the present application further provides a voltage compensation method for a display device, where the display device includes a display screen, a screen driving board, and a power management integrated circuit, and the display screen includes at least one photosensitive sensor and a common voltage compensation circuit; the screen driving board is electrically connected with the photosensitive sensor and the power management integrated circuit, and the power management integrated circuit is electrically connected with the common voltage compensation circuit, as shown in fig. 4, and is a schematic flow chart of the voltage compensation method provided by the embodiment of the application, and the voltage compensation method of the display device comprises the following steps:
s101, when the display screen is in a bright screen state, detecting a sampling signal corresponding to display brightness in the display screen through a photosensitive sensor, and sending the sampling signal to a screen driving plate.
Specifically, the display device and the related components are described in detail above, and are not described herein. Based on the working principle of the photosensitive sensor, the photosensitive sensor is arranged at a position capable of receiving the light irradiation emitted by the display screen, and when the display screen is in a bright screen state, sampling signals corresponding to the display brightness in the display screen are detected through the photosensitive sensor and are sent to the screen driving plate.
As shown in fig. 5, after step S101, further includes:
s103, determining a signal variation according to the signal values of the sampling signals detected twice adjacently, wherein the signal variation comprises a current variation or a voltage variation.
And S104, when the signal variation is out of the preset reference value range, judging that the sampling signal meets the preset condition.
S105, when the signal variation is within the preset reference value range, judging that the sampling signal does not meet the preset condition.
Specifically, when the display screen blinks, the display brightness irradiated on the photosensor may be different, and accordingly, the sampling signal transmitted to the screen driving board may be different. The sampling signal can be a current signal or a voltage signal, the signal variation is determined according to the electric signals detected in two adjacent times, the signal variation comprises the current variation or the voltage variation, and when the signal variation is out of a preset reference value range, the electric signals are judged to meet preset conditions; when the signal variation is within the preset reference value range, the electric signal is judged to not meet the preset condition.
In addition, the range of the preset reference value can be set through the screen driving board, for example, the range of the preset reference value can be set to be larger for a common display device, and the range of the preset reference value can be set to be smaller for a game monitor, so that different quality requirements can be realized according to different products.
The display device further includes a switch control circuit, and the panel driving board is electrically connected to the power management integrated circuit through the switch control circuit, at this time, as shown in fig. 5, in step S102, "the power management integrated circuit is controlled to start the common voltage compensation circuit through the panel driving board", which specifically includes:
the switch control circuit is controlled by the screen driving board to input a high-level signal to the power management integrated circuit, so that the power management integrated circuit starts the public voltage compensation circuit according to the high-level signal.
Specifically, when the electric signal meets a preset condition, the screen driving board generates an NG signal, and controls the switch control circuit to input a high-level signal, i.e. a Power en=on signal, to the Power management integrated circuit, and at this time, the Power management integrated circuit starts the common voltage compensation circuit according to the high-level signal; the switch control circuit may be a voltage divider circuit, for example, when the panel driver board generates an NG signal, it is assumed that the NG signal is a high level signal of 15V, and the power management integrated circuit cannot directly receive the high level signal of 15V, for example, only can receive the high level signal of 3.3V, so that a switching of the level signal is required by the switch control circuit to implement communication between the panel driver board and the power management integrated circuit 130, and at this time, the panel driver board turns on the voltage divider circuit of the switch control circuit to switch the high level signal of 15V to the high level signal of 3.3V, so that the switch control circuit starts the common voltage compensation circuit according to the high level signal.
As shown in fig. 5, after step S101, further includes:
and S106, when the sampling signal does not meet the preset condition, the switch control circuit is controlled by the screen driving board to input a low-level signal to the power management integrated circuit, so that the power management integrated circuit does not start the public voltage compensation circuit according to the low-level signal.
Specifically, when the electrical signal does not meet the preset condition, the panel driving board generates a PASS signal, and controls the switch control circuit to input a low level signal, i.e., a Power en=off signal, to the Power management integrated circuit, at this time, the panel driving board turns OFF the voltage dividing circuit of the switch control circuit, and if the PASS signal is a low level signal of 0V, the low level signal of 0V is directly transmitted to the Power management integrated circuit through the switch control circuit, so that the Power management integrated circuit does not start the common voltage compensation circuit according to the low level signal.
And S102, when the sampling signal meets the preset condition, the power management integrated circuit is controlled by the screen driving board to start the public voltage compensation circuit so as to compensate the public voltage of the display screen.
Specifically, the power management integrated circuit can supply power to the public voltage compensation circuit, can also control whether to start the public voltage compensation circuit, and when the sampling signal meets the preset condition, the power management integrated circuit is controlled by the screen driving board to start the public voltage compensation circuit so as to compensate the public voltage of the display screen, thereby improving the flicker phenomenon.
The application also provides a voltage compensation device applied to a display device, wherein the display device comprises a display screen, a screen driving board and a power management integrated circuit, and the display screen comprises at least one photosensitive sensor and a public voltage compensation circuit; the panel driving board is electrically connected to the photosensitive sensor and the power management integrated circuit, and the power management integrated circuit is electrically connected to the common voltage compensation circuit, as shown in fig. 6, which is a schematic structural diagram of the voltage compensation device according to the embodiment of the present application, and the voltage compensation device 600 includes:
(1) Detection module 610
The detection module 610 is configured to detect, when the display screen is in a bright screen state, a sampling signal corresponding to display brightness in the display screen by using the photosensor, and send the sampling signal to the screen driving board.
Specifically, the display device and the related components are described in detail above, and are not described herein. Based on the working principle of the photosensitive sensor, the photosensitive sensor is arranged at a position capable of receiving the light irradiation emitted by the display screen, and when the display screen is in a bright screen state, the detection module 610 detects a sampling signal corresponding to the display brightness in the display screen through the photosensitive sensor and sends the sampling signal to the screen driving plate.
(2) Adjustment module 620
And the adjustment module 620 is configured to control the power management integrated circuit to start the common voltage compensation circuit through the screen driving board when the sampling signal meets a preset condition, so as to compensate the common voltage of the display screen.
Specifically, the power management integrated circuit may supply power to the common voltage compensation circuit, and may also control whether to turn on the common voltage compensation circuit, and when the sampling signal meets a preset condition, the adjustment module 620 controls the power management integrated circuit to turn on the common voltage compensation circuit through the screen driving board, so as to compensate the common voltage of the display screen, thereby improving the flicker phenomenon.
The display device further includes a switch control circuit, the screen driving board is electrically connected to the power management integrated circuit through the switch control circuit, and the adjustment module 620 is specifically configured to:
after step S101, when the sampling signal meets a preset condition, the switch control circuit is controlled by the panel driving board to input a high-level signal to the power management integrated circuit, so that the power management integrated circuit starts the common voltage compensation circuit according to the high-level signal.
Wherein the adjustment module 620 is further configured to:
after step S101, when the sampling signal does not meet the preset condition, S106 controls the switch control circuit to input a low level signal to the power management integrated circuit through the panel driving board, so that the power management integrated circuit does not start the common voltage compensation circuit according to the low level signal.
Specifically, when the electrical signal meets the preset condition, the adjustment module 620 generates an NG signal through the panel driver board to control the switch control circuit to input a high level signal, i.e. Power en=on signal, to the Power management integrated circuit, and at this time, the Power management integrated circuit starts the common voltage compensation circuit according to the high level signal. The switch control circuit may be a voltage divider circuit, for example, when the panel driver board generates an NG signal, it is assumed that the NG signal is a high level signal of 15V, and the power management integrated circuit cannot directly receive the high level signal of 15V, for example, only can receive the high level signal of 3.3V, so that a switching of the level signal is required by the switch control circuit to implement communication between the panel driver board and the power management integrated circuit 130, and at this time, the panel driver board turns on the voltage divider circuit of the switch control circuit to switch the high level signal of 15V to the high level signal of 3.3V, so that the switch control circuit starts the common voltage compensation circuit according to the high level signal. When the electrical signal does not meet the preset condition, the adjustment module 620 generates a PASS signal through the panel driving board to control the switch control circuit to input a low level signal, i.e. a Power en=off signal, to the Power management integrated circuit, at this time, the panel driving board turns OFF the voltage dividing circuit of the switch control circuit, and the PASS signal is assumed to be a low level signal of 0V, and directly sends the low level signal of 0V to the Power management integrated circuit through the switch control circuit, so that the Power management integrated circuit does not start the common voltage compensation circuit according to the low level signal.
The display device 600 further includes a control module 630, where the control module 630 is specifically configured to:
after the sampling signal is transmitted to the panel driving board, S103, determining a signal variation according to the signal values of the sampling signals detected twice adjacently, the signal variation including a current variation or a voltage variation;
s104, when the signal variation is out of the range of the preset reference value, judging that the sampling signal meets the preset condition;
s105, when the signal variation is within the preset reference value range, judging that the sampling signal does not meet the preset condition.
Specifically, when the display screen blinks, the display brightness irradiated on the photosensor may be different, and accordingly, the sampling signal transmitted to the screen driving board may be different. Wherein, the sampling signal may be a current signal or a voltage signal, the signal variation is determined according to the electrical signals detected in two adjacent times, the signal variation includes a current variation or a voltage variation, and when the signal variation is out of a preset reference value range, the control module 630 determines that the electrical signal meets a preset condition; when the signal variation is within the preset reference value range, it is determined by the control module 630 that the electrical signal does not satisfy the preset condition.
As can be seen from the foregoing, the present application provides a voltage compensation method and apparatus for a display device, and a display device, where the display device includes a display screen, a screen driving board, and a power management integrated circuit, and the display screen includes at least one photosensor and a common voltage compensation circuit, and the photosensor for detecting a change in display brightness of the display screen is disposed in the display screen, and the screen driving board controls the power management integrated circuit to turn on the common voltage compensation circuit according to a sampling signal sent by the photosensor, so as to perform voltage compensation on a common voltage value, thereby accurately detecting a flicker phenomenon of the display screen, and when the display screen flickers, improving the flicker phenomenon quickly and effectively, optimizing a display effect of the display device, and further ensuring stable quality of the display device.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (7)
1. A voltage compensation method of a display device, wherein the display device comprises a display screen, a screen driving board, a switch control circuit and a power management integrated circuit, and the display screen comprises at least one photosensitive sensor, a common electrode and a common voltage compensation circuit; the screen driving board is respectively and electrically connected with the photosensitive sensor and the power management integrated circuit, the screen driving board is electrically connected with the power management integrated circuit through the switch control circuit, the power management integrated circuit is electrically connected with the public voltage compensation circuit, the public voltage compensation circuit is electrically connected with the public electrode, and the voltage compensation method of the display device comprises the following steps:
when the display screen is in a bright screen state, detecting a sampling signal corresponding to display brightness in the display screen through the photosensitive sensor, and sending the sampling signal to the screen driving plate;
when the sampling signal meets a preset condition, the screen driving board controls the switch control circuit to input a high-level signal to the power management integrated circuit, so that the power management integrated circuit starts the public voltage compensation circuit according to the high-level signal; the switch control circuit is used for reducing the first signal sent by the driving board into a second signal and transmitting the second signal to the power management integrated circuit;
the common voltage compensation circuit performs voltage compensation for the common voltage.
2. The method of voltage compensation of a display device according to claim 1, further comprising, after transmitting the sampling signal to the screen driving board:
determining a signal variation according to the signal value of the sampling signal detected in two adjacent times, wherein the signal variation comprises a current variation or a voltage variation;
when the signal variation is out of a preset reference value range, judging that the sampling signal meets a preset condition;
and when the signal variation is within a preset reference value range, judging that the sampling signal does not meet a preset condition.
3. The method of voltage compensation of a display device according to claim 1, further comprising, after transmitting the sampling signal to the screen driving board:
when the sampling signal does not meet the preset condition, the switch control circuit is controlled by the screen driving board to input a low-level signal to the power management integrated circuit, so that the power management integrated circuit does not start the public voltage compensation circuit according to the low-level signal.
4. A voltage compensation device, characterized in that it is applied to a display device, the display device comprises a display screen, a screen driving board, a switch control circuit and a power management integrated circuit, the display screen comprises at least one photosensitive sensor, a common electrode and a common voltage compensation circuit; the screen drive board is respectively with photosensitive sensor with power management integrated circuit electricity is connected, the screen drive board passes through switch control circuit with power management integrated circuit electricity is connected, power management integrated circuit with public voltage compensation circuit electricity is connected, voltage compensation arrangement includes:
the detection module is used for detecting a sampling signal corresponding to display brightness in the display screen through the photosensitive sensor when the display screen is in a bright screen state, and sending the sampling signal to the screen driving plate;
the adjusting module is used for controlling the switch control circuit to input a high-level signal to the power management integrated circuit through the screen driving board when the sampling signal meets a preset condition, so that the power management integrated circuit starts the public voltage compensation circuit according to the high-level signal; the switch control circuit is used for reducing the first signal sent by the driving board into a second signal and transmitting the second signal to the power management integrated circuit;
the common voltage compensation circuit is used for performing voltage compensation on the common electrode.
5. The voltage compensation device of claim 4, wherein the display device further comprises a control module for:
after the sampling signal is sent to the screen driving board, determining a signal variation according to signal values of the sampling signal detected twice, wherein the signal variation comprises a current variation or a voltage variation;
when the signal variation is out of a preset reference value range, judging that the sampling signal meets a preset condition;
and when the signal variation is within a preset reference value range, judging that the sampling signal does not meet a preset condition.
6. The display device is characterized by comprising a display screen, wherein the display screen comprises at least one photosensitive sensor, a public electrode and a public voltage compensation circuit, and the photosensitive sensor is used for detecting the change of the display brightness of the display screen and obtaining a sampling signal; the display device further comprises a screen driving board, a switch control circuit and a power management integrated circuit, wherein the screen driving board is respectively and electrically connected with the photosensitive sensor and the power management integrated circuit, the power management integrated circuit is electrically connected with the public voltage compensation circuit, the screen driving board is electrically connected with the power management integrated circuit through the switch control circuit, and the screen driving board is used for receiving the sampling signal and controlling the power management integrated circuit to start the public voltage compensation circuit according to the sampling signal;
when the screen driving board controls the switch control circuit to input a high-level signal to the power management integrated circuit, the common voltage compensation circuit is started; the switch control circuit is used for reducing the first signal sent by the driving board into a second signal and transmitting the second signal to the power management integrated circuit;
when the screen driving board controls the switch control circuit to input a low-level signal to the power management integrated circuit, the common voltage compensation circuit is not started;
the common voltage compensation circuit is used for performing voltage compensation on the common voltage of the common electrode.
7. The display device according to claim 6, wherein the display screen further comprises a common voltage circuit, and the common electrode is electrically connected to the common voltage compensation circuit and the common voltage circuit, respectively.
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| CN202110361018.4A CN113112939B (en) | 2021-04-02 | 2021-04-02 | Voltage compensation method and device for display device and display device |
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| CN202110361018.4A CN113112939B (en) | 2021-04-02 | 2021-04-02 | Voltage compensation method and device for display device and display device |
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| CN113112939A (en) | 2021-07-13 |
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