CN108597472B - Display device and method for eliminating shutdown ghost - Google Patents
Display device and method for eliminating shutdown ghost Download PDFInfo
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- CN108597472B CN108597472B CN201810790695.6A CN201810790695A CN108597472B CN 108597472 B CN108597472 B CN 108597472B CN 201810790695 A CN201810790695 A CN 201810790695A CN 108597472 B CN108597472 B CN 108597472B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The application provides a display device and a method for eliminating shutdown ghost thereof, wherein the display device comprises: a display panel; the gamma voltage generating unit is electrically coupled with the display panel through a plurality of gamma voltage circuits, and the gamma voltage circuits comprise a black picture control circuit and a gray scale control circuit; the control unit is arranged on the gray scale control circuit and connected with the power supply unit; a power supply unit for supplying power and transmitting a control signal to the control unit; when the control unit obtains the control signal as a first potential, the control unit switches the line state to enable the gamma voltage generating unit and the display panel to form a passage; when the control signal is the second electric potential, the control unit switches the line state to enable the gray scale control line to form an open circuit, the black picture control line is a passage, the gamma voltage generating unit provides the control voltage corresponding to the black picture control line to the display panel, and the display panel presents a black picture.
Description
Technical Field
The present disclosure relates to a method for eliminating ghost, and more particularly, to a display device and a method for eliminating ghost when the display device is turned off.
Background
Liquid Crystal Displays (LCDs) have been widely used recently, and have advantages of low power consumption, light weight, and low voltage driving with the improvement of driving technology, and are widely used in video recorders, notebook computers, desktop displays, and various projection devices.
And a gate driving unit, a source driving circuit and a pixel array are generally provided in the liquid crystal display device. The pixel array is provided with a plurality of pixel circuits, and each pixel circuit is turned on and off according to a scanning signal provided by the grid driving unit and displays a data picture according to a data signal provided by the source driving circuit.
Because of the limitation of the charging and discharging speed of the liquid crystal, there is a possibility that some charges will remain on the liquid crystal panel during shutdown, which may cause the human eyes to see the shutdown ghost. At present, a common method is to generate a control signal when the lcd is turned off, so that the second Driver chip (Gate Driver) turns on the TFT switches of all channels simultaneously, and it is desired to let the charges be discharged as quickly as possible.
Disclosure of Invention
In order to solve the above-mentioned technical problem, an object of the present invention is to provide a display device and a method for eliminating a shutdown afterimage thereof, wherein a gamma voltage line is adjusted so that only a gamma voltage for controlling a black image can be transmitted to a display panel to charge a liquid crystal when the display device is shutdown, so that the display device can only present the black image.
The purpose of the application and the technical problem to be solved are realized by adopting the following technical scheme. According to the present application, a display device is provided, comprising: a display panel; the gamma voltage generating unit is electrically coupled with the display panel through a plurality of gamma voltage circuits, and the gamma voltage circuits comprise a black picture control circuit and a gray scale control circuit; a power supply unit for supplying power and transmitting a control signal; the control unit is arranged on the gray scale control circuit and connected with the power supply unit; when the control unit obtains that the control signal is a first potential, the control unit switches the line state to enable the gray scale control line to form a channel; when the control unit obtains that the control signal is the second electric potential, the control unit switches the line state to enable the gray scale control line to form an open circuit.
The technical problem solved by the application can be further realized by adopting the following technical measures.
In an embodiment of the present application, the control unit is an active switch, a control end of the active switch is connected to the power supply unit, a first end of the active switch is connected to the gamma voltage generating unit, and a second end of the active switch is connected to the display panel.
In an embodiment of the present application, the active switch is a metal oxide semiconductor field effect transistor, and in some embodiments, is an N-type metal oxide semiconductor field effect transistor.
In an embodiment of the present application, the display device further includes a voltage adjustment unit electrically coupled to the display panel through a reference voltage line.
In an embodiment of the present application, the control unit is electrically coupled to the reference voltage line, and when the control signal is obtained by the control unit as the first potential, the control unit switches the line state to open the gray scale control line and the reference voltage line; when the control unit obtains that the control signal is the second electric potential, the control unit switches the line state to enable the gray scale control line and the reference voltage line to form a passage, or enable the gray scale control line and the display panel to form an open circuit.
In an embodiment of the application, the control unit includes a detection circuit, and the detection circuit determines that the control unit cannot switch the line state to make the gray-scale control line form an open circuit when the gray-scale control line and the reference voltage line form a path.
In an embodiment of the application, the control unit includes a detection circuit, and the detection circuit determines that the control unit cannot switch the line state to open the gray-scale control line, so that a path is formed between the gray-scale control line and the reference voltage line.
In an embodiment of the application, when the control unit obtains that the control signal is the second potential, the control unit switches the line state to make the gray-scale control line and the reference voltage line form an on-line, and after a specific time, makes the gray-scale control line form an off-line, and makes the gray-scale control line and the reference voltage line form an off-line.
In an embodiment of the application, the gamma voltage generating unit provides a gamma voltage, the voltage regulating unit provides a reference voltage, and when the reference voltage line is short-circuited with the gray scale control line, a voltage difference between the gamma voltage and the reference voltage of the gray scale control line is 0.
In an embodiment of the present application, the display device further includes a reference voltage generating unit connected to the gamma voltage generating unit, the reference voltage generating unit provides a reference voltage, and the gamma voltage generating unit generates a gamma voltage to the display panel according to the reference voltage.
In an embodiment of the present application, the gamma voltage generating unit, the voltage regulating unit and the control unit are integrated in a gamma voltage chip; or, the gamma voltage generating unit and the voltage regulating unit are integrated in a gamma voltage chip.
In an embodiment of the present application, the output lines of the gamma voltage chip include the reference voltage line and the plurality of gamma voltage lines, and the control unit is disposed on the gray scale control line.
In an embodiment of the application, the output line of the gamma voltage chip includes the reference voltage line and the plurality of gamma voltage lines, the control unit is disposed in the gray scale control line and connected to the reference voltage line, when the control signal is at a first potential, the line state is switched to open the gray scale control line and the reference voltage line, and when the control signal is at a second potential, the gray scale control line and the reference voltage line are opened or closed.
In an embodiment of the present application, the power unit is connected to a gate driving unit, the gate driving unit is connected to a plurality of gate lines, the power unit outputs the control signal to the gate driving unit, and the gate driving unit simultaneously provides a scanning signal to the plurality of gate lines.
Another objective of the present application is to provide a method for eliminating power-off afterimage of a display device, comprising: providing gamma voltages to a display panel through a gamma voltage generating unit, the gamma voltages being output by a plurality of gamma voltage lines of the gamma voltage generating unit; transmitting a control signal through a power supply unit; the control signal is obtained through the control unit to switch the state of the circuit, when the control signal is at a first potential, a path is formed between the gamma voltage generation unit and the display panel, when the control signal is at a second potential, the gray scale control circuit is disconnected, the black picture control circuit is a path, the gamma voltage generation unit provides control voltage corresponding to the black picture control circuit to the display panel, and the display panel presents a black picture.
Another object of the present application is a display device comprising: a display panel; a power supply unit transmitting a control signal; a gate driving unit which connects the plurality of gate lines and the power supply unit, and acquires the control signal; a gamma voltage generating unit including a plurality of gamma voltage lines, the gamma voltage generating unit outputting gamma voltages to the display panel through the plurality of gamma voltage lines, the plurality of gamma voltage lines including a black picture control line and a gray scale control line; a voltage adjusting unit including a reference voltage line, the voltage adjusting unit outputting a reference voltage to the display panel through the reference voltage line; the active switch is arranged on the gray scale control circuit, the control end of the active switch is connected to the power supply unit, the first end of the active switch is connected with the gamma voltage generation unit, the second end of the active switch is connected with the display panel, and the self-control end of the active switch obtains the control signal; when the control signal is obtained as the first potential, the active switch is turned on, and a path is formed between the gamma voltage generating unit and the display panel; the gate driving unit simultaneously provides scanning signals to the gate lines when the control signal is at the second potential, the active switch is turned off when the control signal is at the second potential, the first end and the second end of the active switch are open circuits, the gray scale control circuit is in an open circuit, the black picture control circuit is in a closed circuit, the gamma voltage generating unit provides control voltage corresponding to the black picture control circuit to the display panel, and the display panel presents a black picture.
This application makes when shutting down through the grey scale control circuit design of adjustment gamma voltage circuit, breaks off all grey scale control circuit, keeps the liquid crystal that provides voltage for display panel of black picture control circuit to charge, makes display device only can present the black picture, eliminates the afterimage of shutting down from the picture display, therefore promotes display image quality.
Drawings
FIG. 1 is a schematic diagram of an exemplary LCD panel formed from an array of LCD pixels;
FIG. 2 is a schematic diagram illustrating equivalent capacitive loading of an exemplary LCD pixel-related and related switching element in an LCD panel;
FIG. 3 is a schematic diagram illustrating equivalent capacitive loading of an exemplary LCD pixel-associated and associated switching element in an LCD panel;
FIG. 4 is a schematic diagram of an exemplary gate driver chip;
FIG. 5 is a schematic diagram of a display device according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a display device according to an embodiment of the present application;
FIG. 7 is a schematic view of a display device according to an embodiment of the present application;
FIG. 8 is a schematic view of a display device according to an embodiment of the present application;
fig. 9 is a schematic flow chart illustrating a process of eliminating power-off afterimage in the display device according to the embodiment of the present application.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc. refer to directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
The drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the drawings, elements having similar structures are denoted by the same reference numerals. In addition, the size and thickness of each component shown in the drawings are arbitrarily illustrated for understanding and ease of description, but the present invention is not limited thereto.
In the drawings, the thicknesses of layers, films, panels, regions, and the like are exaggerated for clarity, and the arrangement range of circuits is also exaggerated. In the drawings, the thickness of some layers and regions are exaggerated for understanding and convenience of description, and the range of arrangement of circuits is also exaggerated. It will be understood that when an element such as a layer, film, region, circuit, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.
In addition, in the description, unless explicitly described to the contrary, the word "comprise" will be understood to mean that the recited components are included, but not to exclude any other components. Further, in the specification, "on.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the display device and the method for eliminating the shutdown ghost according to the present invention with reference to the accompanying drawings and the preferred embodiments thereof will be made in detail.
FIG. 1 is a schematic diagram of an exemplary LCD panel formed by an array of LCD pixels. Referring to fig. 1, an lcd panel 10 includes a display module 20 having a plurality of pixels 22 arranged in a two-dimensional array. The pixels are controlled and driven by a plurality of Data lines Data (1), Data (2) and Data (3).. Data (n) and a plurality of Gate lines Gate (1), Gate (2).. Gate (m-1) and Gate (m). The data signal of each data line is provided by a Source Driver chip (Source Driver)30 and the Gate signal of each Gate line is provided by a Gate Driver chip (Gate Driver) 40.
Fig. 2 is a schematic diagram showing equivalent capacitive loading of an exemplary liquid crystal display pixel associated and related switching element in a liquid crystal display panel, fig. 3 is a schematic diagram showing equivalent capacitive loading of an exemplary liquid crystal display pixel associated and related switching element in a liquid crystal display panel, and fig. 4 is a schematic diagram showing operation of an exemplary gate driver chip. In fig. 4, CKV is a clock signal, XAO is a turn-off signal, time T0 is a start time of the turn-off signal XAO, time T1 is an end time of the turn-off signal XAO, and G1, G2 to Gm are Gate signals on the Gate lines Gate (1), Gate (2) to Gate (m).
Referring to fig. 2 to 4, each pixel 22 is associated with a plurality of capacitors, for example, a capacitor Clc formed by and associated with a liquid crystal layer capacitor between upper and lower electrodes, an additional charge storage capacitor Cst maintaining a voltage at Vpixel after a gate line signal passes through, and a capacitor Cgs associated with a gate terminal and a source terminal of a switching element (active switch, TFT). The total pixel capacitance of an lcd panel may vary due to the pixel size, the thickness of the liquid crystal layer, the size of the storage capacitor, and other factors known to those skilled in the art. As shown in fig. 2, the capacitor Clc and the charge storage capacitor Cst are connected to a reference voltage Vcom. As shown in FIG. 3, the charge storage capacitor Cst is connected to one Gate line Gate (m-1).
In the embodiment of the application, due to the limitation of the charging and discharging speed of the liquid crystal, the liquid crystal panel may have some charges left during shutdown, so that human eyes can see shutdown ghost shadows. As shown in fig. 4, the present processing method in the art generates the shutdown signal XAO when the device is turned off, the shutdown signal XAO is a trigger period (T0 to T1), and the Gate driving unit 40 simultaneously provides the Gate signals (G1, G2 to Gm) to all Gate lines (such as Gate (1), Gate (2) · Gate (m-1), and Gate (m) in fig. 2) to turn on the TFT switches on all Gate lines, so as to achieve the purpose of quickly removing the residual charges, but the discharging effect varies with the difference of the display data of the display screen due to the uncertainty of the output of the source driving unit 30, so the method cannot effectively remove the residual charges.
In the embodiment of the present application, fig. 5 shows a schematic diagram of the apparatus. As shown in fig. 5, in an embodiment of the present application, a display device 200 includes: a display panel 10; a gamma voltage generating unit 120 electrically coupled to the display panel 10 through a plurality of gamma voltage lines 121; the gamma voltage lines 121 include a black frame control line 121b and a gray scale control line 121 a; a power supply unit 150 providing power required for operation of related components of the display device and a transmission control signal 151; a control unit 140 disposed on the gray-scale control circuit 121a and connected to the power supply unit 150 to obtain the control signal 151; when the control unit 140 obtains that the control signal 151 is at the first potential, the control unit 140 switches the line state to enable the gray-scale control line 121a to form a channel, and the black frame control line 121b is also in a channel state; when the control unit 140 obtains the control signal 151 as the second potential, the control unit 140 switches the line state to make the gray-scale control line 121a form an open circuit, the black frame control line 121b remains on, the gamma voltage generating unit 120 provides the control voltage corresponding to the black frame control line 121b to the display panel 10, and the display panel 10 presents a black frame.
In an embodiment of the present application, the display device further includes a voltage adjusting unit 130 electrically coupled to the display panel through a reference voltage line 131.
In an embodiment of the present application, the reference voltage generating unit 110 provides reference voltages to the gamma voltage generating unit 120 and the voltage regulating unit 130, respectively. The gamma voltage generating unit 120 generates a plurality of gamma voltages (gamma) according to the reference voltage, and the gamma voltages are output to the display panel 10 through a plurality of gamma voltage lines 121. The gamma voltages (gamma) generate a reference voltage VCOM according to the reference voltage, and the reference voltage VCOM is output to the display panel 10 through the reference voltage line 131. The voltage difference between the two ends of the liquid crystal corresponding to each pixel 22 is the deviation between the gamma voltage (gamma) and the reference voltage VCOM.
The power unit 150 provides a control signal 151 (e.g., a shutdown signal XAO) to the control unit 140 during shutdown operations. In some embodiments, the control signal 151 has at least two potential states, such as a first potential and a second potential. When the control signal 151 is at the first potential, the control unit 140 enables the gray-scale control line 121a to form a path, or enables the gray-scale control line 121a and the display panel 10 to form a path; when the control signal 151 is at the second potential, the control unit 140 opens the gray-scale control circuit 121a, or opens the gray-scale control circuit 121a and the display panel 10.
In one embodiment of the present application, the Gamma voltage line 121 has 14 lines (Gamma1-Gamma14), wherein the lines Gamma7-8 provide positive and negative voltages for controlling black frames, and the lines Gamma1-6 and Gamma9-14 are voltage ties for other gray-scale brightness.
Fig. 6 is a schematic view of a display device according to an embodiment of the present application. As shown in fig. 6, in an embodiment of the present application, the control unit 140 is an active switch 141, and a control terminal of the active switch 141 is connected to the power supply unit 150. The first terminal and the second terminal of the active switch 141 are respectively connected to the gamma voltage generating unit 120 and the display panel 10. In some embodiments, the gray-scale control lines 121a each include an active switch 141.
In an embodiment of the present application, the active switch 141 is, for example, a transistor, and is not limited herein. In some embodiments, the active switch 141 is, for example, a metal oxide semiconductor field effect transistor, and in some embodiments, an N-type metal oxide semiconductor field effect transistor. When the control signal 151 is at a high potential, the first terminal and the second terminal of the active switch 141 are turned on, the gray-scale control line 121a is a path, and paths are formed between all the gamma voltage lines 121 and the display panel 10. When the control signal 151 is at a low voltage level, the first terminal and the second terminal of the active switch 141 are disconnected, the gray-scale control line 121a is disconnected, but the black frame control line 121b remains connected.
Fig. 7 is a schematic view of a display device according to an embodiment of the present application. In an embodiment of the present invention, the control unit 140 is electrically coupled to the reference voltage line 131, and when the control unit 140 obtains the control signal 151 as the first potential, the control unit 140 switches the line state to make the gray-scale control line 121a and the reference voltage line 131 form an open circuit, but keeps all the gamma voltage lines 121 and the display panel 10 as a pass circuit; when the control unit 140 obtains the control signal 151 as the second potential, the control unit 140 switches the line state to make the gray-scale control line 121a and the reference voltage line 131 form a path, or make the gray-scale control line 121a and the display panel 10 form an open circuit. When the reference voltage line 131 is short-circuited with the gray scale control line 121a, the voltage difference between the gamma voltage of the gray scale control line 121a and the reference voltage is 0, and the liquid crystal stops deflecting, so that the picture of the display panel 10 is immediately blackened, and the elimination of the shutdown afterimage is accelerated.
In an embodiment of the present application, the control unit 140 includes a detection circuit (not shown), and the detection circuit determines that the control unit 140 cannot switch the line state to form a path between the gray-scale control line 121a and the reference voltage line 131, and then opens the gray-scale control line 121a and the display panel 10.
In an embodiment of the present application, when the detection circuit determines that the control unit 140 cannot switch the line state to form an open circuit between the gray-scale control line 121a and the display panel 10, a path is formed between the gray-scale control line 121a and the reference voltage line 131.
In an embodiment of the present invention, when the control unit 140 obtains the control signal 151 as the second potential, the control unit 140 switches the line state to make the gray-scale control line 121a and the reference voltage line 131 form a path, and after a certain time, makes the gray-scale control line 121a and the reference voltage line 131 form an open circuit.
In an embodiment of the present application, the gamma voltage generating unit 120, the voltage regulating unit 130 and the control unit 140 are integrated into a gamma voltage chip.
In an embodiment of the present application, the output lines of the gamma voltage chip include the reference voltage line 131 and the gamma voltage lines 121, and the control unit 140 is disposed on the gray scale control line 121 a.
In an embodiment of the present application, the output lines of the gamma voltage chip include the reference voltage line 131 and the gamma voltage lines 121, and the control unit 140 is disposed on the gray scale control line 121a and connected to the reference voltage line 131.
Fig. 8 is a schematic view of a display device according to an embodiment of the present application, please refer to fig. 1 and 7 for understanding. As shown in fig. 8, in an embodiment of the present application, the power supply unit 150 is connected to the gate driving unit 40, the gate driving unit 40 is connected to a plurality of gate lines, the power supply unit 150 outputs the control signal 151 to the gate driving unit 40, and the gate driving unit 40 simultaneously provides the scan signals to the plurality of gate lines.
In an embodiment of the present application, a display device 200 includes: a display panel 10; a power supply unit 150 that transmits a control signal 151; a gate driving unit 40 connecting a plurality of gate lines disposed on the display panel 10 and the power supply unit 150, the gate driving unit 40 obtaining the control signal 151; a gamma voltage generating unit 120 including a plurality of gamma voltage lines 121, the gamma voltage generating unit 120 outputting gamma voltages to the display panel 10 through the plurality of gamma voltage lines 121, the plurality of gamma voltage lines 121 including a black picture control line 121b and a gray scale control line 121 a; a voltage adjusting unit 130 including a reference voltage line 131, the voltage adjusting unit 130 outputting a reference voltage to the display panel 10 through the reference voltage line 131; an active switch 141 disposed on the gray scale control circuit 121a, wherein a control terminal of the active switch 141 is connected to the power supply unit 150, a first terminal of the active switch 141 is connected to the gamma voltage generating unit 120, a second terminal of the active switch 141 is connected to the display panel 10, and the active switch 141 obtains the control signal 151 from the control terminal; when the gate driving unit 40 obtains the control signal 151 as a first potential, the gate driving unit sequentially provides scanning signals to the plurality of gate lines, and when the active switch 141 obtains the control signal 151 as the first potential, the active switch 141 is turned on, so that a path is formed between the gamma voltage generating unit 120 and the display panel 10; when the gate driving unit 40 obtains the control signal 151 as the second potential, the gate driving unit simultaneously provides the scan signals to the plurality of gate lines, when the active switch 141 obtains the control signal 151 as the second potential, the active switch 141 is turned off, the first end and the second end of the active switch 141 are opened, the gray-scale control line 121a is opened, the black frame control line 121b is closed, the gamma voltage generating unit 120 provides the control voltage corresponding to the black frame control line 121b to the display panel 10, and the display panel 10 presents a black frame.
Fig. 9 is a schematic flow chart illustrating a process of eliminating shutdown ghost in the display device according to the embodiment of the present application, which is further understood with reference to fig. 1 to 8. As shown in fig. 9, in an embodiment of the present application, a method for eliminating shutdown ghosting includes:
in step S910, a gamma voltage is provided to the display panel 10 by the gamma voltage generating unit 120, the gamma voltage being output by the plurality of gamma voltage lines 121 of the gamma voltage generating unit 120.
In step S920, the control signal 151 is transmitted through the power supply unit 150.
Step S930, obtaining the control signal 151 through the control unit 140 to switch the line state, where a path is formed between the gamma voltage generating unit 120 and the display panel 10 when the control signal 151 is at the first potential, the gray scale control line 121a is disconnected when the control signal is at the second potential, the black picture control line 121b is a path, the gamma voltage generating unit 120 provides the control voltage corresponding to the black picture control line to the display panel 10, and the display panel 10 presents a black picture.
This application changes the design of adjusting the circuit between gamma voltage and the reference voltage, and when making the shutdown, gamma voltage and reference voltage are the same voltage, and display panel's liquid crystal can't show the picture because of there is not pressure differential stop action promptly, and the ghost of shutting down is eliminated from the picture display, therefore promotes and shows picture quality.
The display panel of the present application includes a first substrate and a second substrate, which have a plurality of patterns, for example, a Thin Film Transistor (TFT) substrate and a Color Filter (CF) substrate. However, in some embodiments, the active matrix switch and the color filter layer of the present application may also be formed on the same substrate.
In some embodiments, the display panel of the present application is a liquid crystal display panel, but is not limited thereto, and may also be an OLED display panel, a W-OLED display panel, a QLED display panel, a plasma display panel, a curved display panel or other types of display panels.
This application makes when shutting down through the grey scale control circuit design of adjustment gamma voltage circuit, breaks off all grey scale control circuit, keeps the liquid crystal of providing voltage for display panel of black picture control circuit to charge, makes display device only present the black picture, eliminates the afterimage of shutting down from the picture display, therefore promotes display image quality. Secondly, the present application can maintain the original process requirements and product costs without significantly changing the existing production flow. Thirdly, the present application is suitable for the manufacturing process of various display devices because the existing production flow does not need to be changed greatly. Fourthly, the display panel display method and the display panel display device can be suitable for various types of display panels, and the applicability is relatively high.
The terms "in some embodiments" and "in various embodiments" are used repeatedly. This phrase generally does not refer to the same embodiment; it may also refer to the same embodiment. The terms "comprising," "having," and "including" are synonymous, unless the context dictates otherwise.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.
Claims (9)
1. A display device, comprising:
a display panel;
the gamma voltage generating unit is electrically coupled with the display panel through a plurality of gamma voltage circuits, and the gamma voltage circuits comprise a black picture control circuit and a gray scale control circuit;
a power supply unit for supplying power and transmitting a control signal;
the control unit is arranged on the gray scale control circuit and connected with the power supply unit;
the control unit is an active switch, the control end of the active switch is connected with the power supply unit, the first end of the active switch is connected with the gamma voltage generation unit, and the second end of the active switch is connected with the display panel;
when the control signal is high potential, the first end and the second end of the active switch are conducted, the control unit switches the line state to enable the gray scale control line to form a channel, and the black picture control line is in a channel state; when the control unit obtains that the control signal is at a low potential, the first end and the second end of the active switch are disconnected, the control unit switches the line state to enable the gray-scale control line to form an open circuit, and the black picture control line still keeps a connection.
2. The display device of claim 1, wherein the active switch is a metal oxide semiconductor field effect transistor.
3. The display device of claim 1, further comprising a voltage regulation unit electrically coupled to the display panel through a reference voltage line.
4. The display device according to claim 3, wherein the control unit is electrically coupled to the reference voltage line, and when the control unit obtains the control signal as a first potential, the control unit switches a line state to open the gray-scale control line and the reference voltage line; when the control unit obtains that the control signal is the second electric potential, the control unit switches the line state to enable the gray scale control line and the reference voltage line to form a passage, or enable the gray scale control line and the display panel to form an open circuit.
5. The display device as claimed in claim 3, further comprising a reference voltage generating unit connected to the gamma voltage generating unit, wherein the reference voltage generating unit provides a reference voltage, and the gamma voltage generating unit generates the plurality of gamma voltages to the display panel according to the reference voltage.
6. The display device as claimed in claim 5, wherein the gamma voltage generating unit, the voltage regulating unit and the control unit are integrated into a gamma voltage chip; or, the gamma voltage generating unit and the voltage regulating unit are integrated in a gamma voltage chip.
7. The display device as claimed in claim 6, wherein the output lines of the gamma voltage chip include the reference voltage line and the plurality of gamma voltage lines, and the control unit is disposed on the gray scale control line.
8. A method for eliminating shutdown afterimage of a display device, applied to the display device as claimed in claim 1, the method comprising:
providing gamma voltages to a display panel through a gamma voltage generating unit, the gamma voltages being output by a plurality of gamma voltage lines of the gamma voltage generating unit;
transmitting a control signal through a power supply unit;
the control signal is obtained through the control unit to switch the state of the circuit, when the control signal is at a high potential, a passage is formed between the gamma voltage generation unit and the display panel, the black picture control circuit is in a passage state, when the control signal is at a low potential, the gray scale control circuit is in an open circuit, the black picture control circuit is still in a passage, the gamma voltage generation unit provides the control voltage corresponding to the black picture control circuit to the display panel, and the display panel presents a black picture.
9. A display device, comprising:
a display panel;
a power supply unit transmitting a control signal;
a gate driving unit which connects the plurality of gate lines and the power supply unit, and acquires the control signal;
a gamma voltage generating unit including a plurality of gamma voltage lines, the gamma voltage generating unit outputting gamma voltages to the display panel through the plurality of gamma voltage lines, the plurality of gamma voltage lines including a black picture control line and a gray scale control line;
a voltage adjusting unit including a reference voltage line, the voltage adjusting unit outputting a reference voltage to the display panel through the reference voltage line;
the active switch is arranged on the gray scale control circuit, the control end of the active switch is connected to the power supply unit, the first end of the active switch is connected with the gamma voltage generation unit, the second end of the active switch is connected with the display panel, and the active switch obtains the control signal from the control end;
when the control signal is obtained as the first potential by the gate driving unit, the active switch is turned on, and the gray scale control circuit forms a passage; when the control signal is obtained to be the second electric potential, the grid driving unit provides scanning signals for the grid lines at the same time, when the active switch obtains the control signal to be the second electric potential, the active switch is closed, the first end and the second end of the active switch are open, and the gray scale control circuit forms open circuit.
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| CN109192163A (en) * | 2018-10-10 | 2019-01-11 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
| CN108986764A (en) * | 2018-10-10 | 2018-12-11 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
| CN109192164A (en) | 2018-10-10 | 2019-01-11 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
| CN109256104B (en) * | 2018-11-22 | 2024-04-12 | 惠科股份有限公司 | Display device, display panel power supply system and circuit thereof |
| WO2020103231A1 (en) * | 2018-11-22 | 2020-05-28 | 惠科股份有限公司 | Display device, and display panel power source system and circuit |
| CN109346022B (en) * | 2018-12-11 | 2022-05-06 | 惠科股份有限公司 | Protection method of display panel, display panel and computer readable storage medium |
| CN109859703B (en) * | 2019-01-08 | 2021-03-02 | 合肥鑫晟光电科技有限公司 | Display control device, display control method, and display apparatus |
| CN110111752A (en) * | 2019-04-08 | 2019-08-09 | 北海惠科光电技术有限公司 | A kind of driving circuit and display device |
| CN113366564A (en) * | 2020-01-06 | 2021-09-07 | 京东方科技集团股份有限公司 | Control method and device of display panel |
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| CN101299322B (en) * | 2007-04-30 | 2011-12-07 | 联詠科技股份有限公司 | Display device for eliminating closedown ghost and drive device |
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| CN107369419A (en) * | 2017-08-08 | 2017-11-21 | 昆山龙腾光电有限公司 | Liquid crystal display device and its driving method |
| CN107274851A (en) * | 2017-08-14 | 2017-10-20 | 京东方科技集团股份有限公司 | display panel and its driving method and display device |
| CN107589608A (en) * | 2017-09-25 | 2018-01-16 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
| CN107742495A (en) * | 2017-10-12 | 2018-02-27 | 惠科股份有限公司 | Drive circuit and display device |
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