CN211150071U - Driving system and display device thereof - Google Patents
Driving system and display device thereof Download PDFInfo
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- CN211150071U CN211150071U CN202020381941.5U CN202020381941U CN211150071U CN 211150071 U CN211150071 U CN 211150071U CN 202020381941 U CN202020381941 U CN 202020381941U CN 211150071 U CN211150071 U CN 211150071U
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- 239000003990 capacitor Substances 0.000 claims description 8
- 230000008030 elimination Effects 0.000 description 20
- 238000003379 elimination reaction Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 239000010409 thin film Substances 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
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- 101100219315 Arabidopsis thaliana CYP83A1 gene Proteins 0.000 description 1
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- 101000835083 Homo sapiens Tissue factor pathway inhibitor 2 Proteins 0.000 description 1
- 101100269674 Mus musculus Alyref2 gene Proteins 0.000 description 1
- 101100140580 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) REF2 gene Proteins 0.000 description 1
- 102100026134 Tissue factor pathway inhibitor 2 Human genes 0.000 description 1
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Abstract
The application discloses actuating system and display device thereof, actuating system includes: the master control circuit is used for providing an input signal and a backlight enabling signal; the shadow eliminating control circuit is connected with the master control circuit and is used for generating a control signal according to the input signal and the backlight enabling signal; the source electrode driving circuit is connected with the shadow eliminating control circuit and used for providing first gray scale data or second gray scale data for the display device according to the control signal, wherein the first gray scale data is used for displaying a black picture; the second gradation data is used to display a normal picture. The display device comprises a display panel and a driving system as described above. When the driving system and the display device thereof represent the display device to execute the power-on operation or the power-off operation according to the level states of the input signal and the backlight enabling signal, the control signal of the effective level state is provided to enable the source electrode driving circuit to provide the first gray scale data, and then the display device displays the black picture, so that the purposes of eliminating the power-off residual image and releasing the residual charge are achieved.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a driving system and display device thereof.
Background
The display panel of the liquid crystal display device comprises a plurality of pixel units which are arranged in an array mode, and each pixel unit comprises a thin film transistor and a pixel electrode connected with the thin film transistor. The driving system of the display device controls the thin film transistor to enable the liquid crystal to generate preset deflection through the pixel electrode, and further provides light sources by matching with the backlight source, so that picture display is realized.
However, in the display device, after the screen display is finished, charges remain on the pixel electrodes of the pixel units. If the display device is turned on to perform the image display operation under the condition that the charges remain on the pixel electrode, the remaining charges can affect the writing of the pixel data into the pixel unit, so that the image sticking exists when the image is displayed.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a driving system and a display device thereof to avoid the occurrence of afterimages when displaying a picture.
According to an aspect of the present invention, there is provided a driving system, including: the master control circuit is used for providing an input signal and a backlight enabling signal; the shadow eliminating control circuit is connected with the master control circuit and is used for generating a control signal according to the input signal and the backlight enabling signal; the source electrode driving circuit is connected with the shadow elimination control circuit and used for providing first gray scale data or second gray scale data for the display device according to the control signal, wherein the first gray scale data is used for displaying a black picture; the second gradation data is used to display a normal picture.
Preferably, when the control signal is in an active level state, the source driving circuit provides the first gray scale data to the display device; and when the control signal is in an invalid level state, the source electrode driving circuit provides the second gray scale data for the display device.
Preferably, the shadow control circuit provides a control signal of an active level state in a case that the level states of the input signal and the backlight enable signal represent that the display apparatus performs a shutdown operation.
Preferably, the shadow control circuit provides a control signal of an active level state when the level states of the input signal and the backlight enable signal represent that the display device performs a power-on operation.
Preferably, the shading control circuit includes: a first operational amplifier, a first input end of which is connected with and receives a first reference voltage, a second input end of which is connected with and receives the backlight enabling signal, a positive power supply end of which is connected with and receives the input signal, and a negative power supply end of which is grounded; the timing end of the edge trigger is connected with the output end of the first operational amplifier, and the input end of the edge trigger is connected with and receives the input signal; and the first input end of the second operational amplifier is connected with and receives a second reference voltage, the second input end of the second operational amplifier is connected with the output end of the edge trigger, the positive power supply end of the second operational amplifier is connected with and receives the input signal, the negative power supply end of the second operational amplifier is grounded, and the output end of the second operational amplifier outputs the control signal.
Preferably, the method further comprises the following steps: a third operational amplifier, wherein the first input end is connected with and receives the backlight enabling signal, the second input end is connected with the output end, the positive power end is connected with and receives the input signal, the negative power end is grounded, and the output end is connected with the second input end of the first operational amplifier to obtain the backlight enabling signal transmitted by the third operational amplifier; and the first input end of the fourth operational amplifier is connected with the output end of the second operational amplifier, the second input end of the fourth operational amplifier is connected with the output end, the positive power supply end is connected with and receives the input signal, the negative power supply end is grounded, and the output end outputs a control signal transmitted by the fourth operational amplifier.
Preferably, the method further comprises the following steps: and one end of the first capacitor is connected with the output end of the first operational amplifier, and the other end of the first capacitor is grounded.
Preferably, a voltage value of the first reference voltage is related to a voltage value of an active level state of the backlight enable signal, and a level state of the second reference voltage is related to a voltage value of an active level state of the control signal.
Preferably, the shading control circuit includes: the control end of the first switch tube is connected with and receives the backlight enabling signal, the first path end of the first switch tube is connected with and receives the input signal, and the second path end of the first switch tube is grounded through a resistor; the timing end of the edge trigger is connected with the second path end of the first switching tube, and the input end of the edge trigger is connected with and receives the input signal; and the control end of the second switch tube is connected with the output end of the edge trigger, the first path end is connected with and receives the input signal, and the second path end is grounded through a resistor and outputs the control signal.
Preferably, the power-on operation is performed in response to the input signal changing to an active level state and the backlight enable signal maintaining an inactive level state, and the power-off operation is performed in response to the backlight enable signal changing to an inactive level state and the input signal maintaining an active level state.
According to another aspect of the present invention, there is also provided a display device, including a display panel and the driving system as described above, wherein the driving system is used for driving the display panel.
The utility model provides a driving system and display device thereof is through setting up vanishing control circuit in driving system to when level state representation display device according to input signal and the enabling signal that is shaded carries out start operation or shutdown operation, the control signal who provides effective level state makes source drive circuit carry out the operation that resets and provides the first grey scale data that shows the black picture to display device, and then display device shows that the black picture is in response to the operation that resets. So as to achieve the purpose of eliminating the shutdown ghost shadow and releasing the residual charge.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a timing diagram of a shadow elimination control circuit provided according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram illustrating a shadow elimination control circuit according to an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of another shadow elimination control circuit provided in accordance with an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.
Fig. 1 shows a schematic structural diagram of a display device according to an embodiment of the present invention.
As shown in fig. 1, the display device 100 includes a display panel 110 and a driving system 120, wherein the driving system 120 is used for driving the display panel 110 to make the display panel 110 perform a display operation.
The display panel 110 includes a plurality of pixel units 112 arranged in an n × m array, each pixel unit 112 includes a thin film transistor and a pixel electrode, a gate of the thin film transistor is connected to an output terminal of the gate driving circuit 124 through a gate line 114 arranged in a row, a source of the thin film transistor is connected to an output terminal of the source driving circuit 123 through a source line 113 arranged in a column, and a drain of the thin film transistor is connected to a pixel electrode in the pixel unit, where n and m are positive integers, the display panel 110 further includes a backlight source (not shown) for providing a light source for liquid crystal in the display device 100 to realize image display.
The driving system 120 includes a timing control circuit 122, a source driving circuit 123, a gate driving circuit 124, a backlight control circuit 125, a shadow elimination control circuit 126, and an overall control circuit 121, and specifically, the overall control circuit 121 in the driving system is a partial circuit for controlling the display of the display device 100.
The general control circuit 121 provides an input signal Vin and a backlight enable signal EN for the display device 100 to perform a display operation. The input signal Vin includes gray-scale data information and timing information.
The timing control circuit 122 is connected to the overall control circuit 121 to receive the input signal Vin, process the input signal Vin to obtain a second gray scale DATA containing gray scale DATA information and a timing signal C L K, and respectively provide the second gray scale DATA to the source driving circuit 123 and the timing signal C L K to the gate driving circuit 124.
The source driver circuit 123 is connected to the timing controller circuit 122, and generates a source driving signal based on the second gray scale DATA, and outputs the source driving signal containing a gray scale voltage to the source of the tft in the pixel unit 112 via the source line 113. the gate driver circuit 124 is connected to the timing controller circuit 122, and generates a gate driving signal based on the timing signal C L K, and outputs the gate driving signal to the gate of the tft in the pixel unit 112 via the gate line 114 to turn on the tft, and further transmits the source driving signal containing the gray scale voltage to the drain of the tft to be written into the pixel electrode of the pixel unit 112. further, the liquid crystal in the display device 100 is deflected in a predetermined manner based on the voltage supplied from the pixel electrode and the common voltage supplied from the common controller circuit 121, and is normally displayed in combination with the light source supplied from the backlight source driver circuit 123. when the reset terminal is loaded with a control signal in an inactive level state, the source driver circuit 123 receives the second gray scale DATA supplied from the timing controller circuit 122 to perform normal display when the reset terminal is loaded with a control signal, and further, the source driver circuit performs a black display in response to the black display frame when the gray scale DATA is loaded with the reset signal, the gray scale DATA, the reset circuit 100, and further, the reset circuit performs a black display frame.
The backlight control circuit 125 is connected to the overall control circuit 121 to receive the backlight enable signal EN, and the backlight control circuit 125 is connected to the backlight source and controls the backlight source to provide light to the display device 100 based on the backlight enable signal EN.
The shadow elimination control circuit 126 is connected to the reset terminal, and provides the control signal CTR L of the active level state to the reset terminal when the level states of the input signal Vin and the backlight enable signal EN indicate that the display device performs the shutdown operation, so that the display device 100 performs the display of the black picture in response to the reset operation of the reset terminal.
In a preferred embodiment, the shadow elimination control circuit 126 also provides the control signal CTR L of active level state to the reset terminal in case that the level states of the input signal Vin and the backlight enable signal EN indicate that the display device performs the power-on operation.
Fig. 2 shows a timing diagram of a shadow elimination control circuit according to an embodiment of the present invention.
The general control circuit 212 provides the input signal Vin to the timing control circuit 122 and the shadow elimination control circuit 126, respectively, and provides the backlight enable signal EN to the backlight control circuit 125 and the shadow elimination control circuit 126, respectively, the input signal Vin and the backlight enable signal EN serve as input sources of the shadow elimination control circuit 126, and the control signal CTR L serves as an output of the shadow elimination control circuit 126.
As shown in FIG. 2, when the input signal Vin changes from a low level state to a high level state and the backlight enable signal EN remains in the low level state, the display device 100 is characterized to perform a power-on operation, the control signal CTR L changes from the low level state to the high level state in response to the power-on operation under the control of the shadow elimination control circuit 126, and the reset terminal performs a reset operation in response to the low level state of the control signal CTR L before the change, and the source driving circuit 124 provides first gray scale DATA for displaying a black frame, and the display device 100 displays the black frame in response to the reset operation, then, when the input signal Vin remains in the high level state and the backlight enable signal EN changes from the low level state to the high level state, the display device 100 performs a frame display operation, the source driving circuit 123 receives second gray scale DATA DATA provided by the timing control circuit 122, the gate driving circuit 124 receives timing signals provided by the timing circuit 122, and implements a frame display in response to the frame display operation, the control signal CTR L remains in the high level state, and the reset terminal maintains the input signal DATA IN.
It should be noted that, the above-mentioned input signal Vin and the backlight enable signal EN are both active at a high level, and the embodiment in which the control signal CTR L is active at a low level is only for better understanding of the present invention, and the implementation of the present invention is not limited thereto.
It should be noted that the shadow elimination control circuit in this embodiment is a preferred embodiment, and as an alternative embodiment, the reset operation may be executed only in response to the execution of the power-off operation or the execution of the power-on operation, so that the display device displays the black screen.
Fig. 3 shows a schematic structural diagram of a shadow elimination control circuit according to an embodiment of the present invention.
As shown in fig. 3, the shadow elimination control circuit includes a first operational amplifier U1, a second operational amplifier U2, and an edge flip-flop U5.
The first input end of the first operational amplifier U1 is connected with and receives a first reference voltage REF1, the second input end of the first operational amplifier U1 is connected with the master control circuit 121 and receives a backlight enable signal EN, the positive power end of the first operational amplifier U1 is connected with and receives an input signal Vin of the master control circuit 121, the negative power end of the first operational amplifier U1 is grounded, the timing end C L K end of the edge flip-flop U5 is connected with the output end of the first operational amplifier U1, the input end D end of the edge flip-flop U5 is connected with and receives an input signal Vin, the power end of the edge flip-flop U5 receives a supply voltage VDD, the supply voltage VDD is 5V for example, the first input end of the second operational amplifier U2 is connected with and receives a second reference voltage REF2, the second input end of the second operational amplifier U2 is connected with the output end Q end of the edge master flip-flop U5 via a second resistor R2, the second input end of the second operational amplifier U2 is connected with and receives a positive input signal REF, the input signal REF and a second reference voltage R8672, the anode of the operational amplifier U L is connected with and controls the negative power level of the anode of the operational amplifier U L, the negative power end of the operational amplifier U L, the operational amplifier U L controls the negative power output voltage of the negative voltage of the operational amplifier U L, the operational amplifier.
In the preferred embodiment, a third op-amp U3 and a fourth op-amp U4 are also included.
A first input end of the third operational amplifier U3 is connected to the general control circuit 121 and receives the backlight enable signal EN, a second input end of the third operational amplifier U3 is connected to the output end, a positive power source end of the third operational amplifier U3 is connected to and receives the input signal Vin, a negative power source end of the third operational amplifier U3 is grounded, and an output end of the third operational amplifier U3 is connected to a second input end of the first operational amplifier U1 to obtain the backlight enable signal EN transmitted through the third operational amplifier U3. Due to the arrangement of the third operational amplifier U3, the backlight enable signal EN provided by the master control circuit 121 is more stable, and the stability of the shadow elimination control circuit 126 is improved.
The first input end of the fourth operational amplifier U4 is connected with the output end of the second operational amplifier U2, the second input end of the fourth operational amplifier U4 is connected with the output end, the positive power supply end of the fourth operational amplifier U4 is connected with and receives an input signal Vin, the negative power supply end of the fourth operational amplifier U4 is grounded, the output end of the fourth operational amplifier U4 outputs a control signal CTR L transmitted through the fourth operational amplifier U4, and the arrangement of the fourth operational amplifier U4 enables the CTR L output to the reset end to be more stable, and improves the stability of the shadow elimination control circuit 126.
Preferably, a first capacitor C1 is also included. One end of the first capacitor C1 is connected to the output end of the first operational amplifier U1, and the other end is grounded. One end of the first resistor R1 is connected to one end of the first capacitor C1, and the other end is grounded. The first capacitor C1 is set so that the output of the edge flip-flop U5 is not disturbed.
The edge flip-flop U5 is, for example, a D flip-flop.
Fig. 4 shows a schematic structural diagram of another shadow elimination control circuit provided in accordance with an embodiment of the present invention.
As shown in fig. 4, the shadow control circuit includes a first switch Q1, a second switch Q2, and an edge flip-flop U5.
The control end of the first switch tube Q1 is connected with the master control circuit 121 and receives a backlight enable signal EN, the first pass end of the first switch tube Q1 is connected with and receives an input signal Vin, the second pass end of the first switch tube Q1 is grounded through a third resistor R3, the timing end C L K end of the edge trigger U5 is connected with the second pass end of the first switch tube Q1, the input end D end of the edge trigger U5 is connected with the master control circuit 121 and receives the input signal Vin, the power supply end of the edge trigger U5 receives a supply voltage VDD, the supply voltage VDD is 5V for example, the control end of the second switch tube Q2 is connected with the output end of the edge trigger U5 through a fourth resistor R4, the first pass end of the second switch tube Q2 is connected with and receives the input signal Vin, the second pass end of the second switch tube Q2 is grounded through a fifth resistor R5 and outputs the control signal CTR L, the second pass end of the second switch tube Q3527 is connected with and the cathode of the second switch tube 2.
In the driving system and the display device thereof provided by this embodiment, the shadow elimination control circuit is arranged, and when the display device is characterized to perform a power-on operation or a power-off operation according to the level states of the input signal and the backlight enable signal, the control signal of the effective level state is provided to enable the source driving circuit to perform a reset operation to provide the first gray scale data for displaying the black picture to the display device, and then the display device displays the black picture and responds to the reset operation. So as to achieve the purpose of eliminating the shutdown ghost shadow and releasing the residual charge.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A drive system, comprising: the master control circuit provides an input signal and a backlight enabling signal; it is characterized by also comprising:
the shadow eliminating control circuit is connected with the master control circuit and generates a control signal according to the input signal and the backlight enabling signal;
the source electrode driving circuit is connected with the shadow eliminating control circuit and provides first gray scale data or second gray scale data for the display device according to the control signal, wherein the first gray scale data is used for displaying a black picture; the second gradation data is used to display a normal picture.
2. The driving system according to claim 1, wherein the source driving circuit provides the first gray scale data to the display device when the control signal is in an active level state;
and when the control signal is in an invalid level state, the source electrode driving circuit provides the second gray scale data for the display device.
3. The driving system of claim 2, wherein the level states of the input signal and the backlight enable signal are indicative of control signals of active level states provided by the shadow control circuit when the display device performs a power-off operation and a power-on operation.
4. The drive system of claim 3, wherein the vanishing control circuit comprises:
a first operational amplifier, a first input end of which is connected with and receives a first reference voltage, a second input end of which is connected with and receives the backlight enabling signal, a positive power supply end of which is connected with and receives the input signal, and a negative power supply end of which is grounded;
the timing end of the edge trigger is connected with the output end of the first operational amplifier, and the input end of the edge trigger is connected with and receives the input signal; and
and the first input end of the second operational amplifier is connected with and receives a second reference voltage, the second input end of the second operational amplifier is connected with the output end of the edge trigger, the positive power supply end of the second operational amplifier is connected with and receives the input signal, the negative power supply end of the second operational amplifier is grounded, and the output end of the second operational amplifier outputs the control signal.
5. The drive system of claim 4, further comprising:
a third operational amplifier, wherein the first input end is connected with and receives the backlight enabling signal, the second input end is connected with the output end, the positive power end is connected with and receives the input signal, the negative power end is grounded, and the output end is connected with the second input end of the first operational amplifier to obtain the backlight enabling signal transmitted by the third operational amplifier;
and the first input end of the fourth operational amplifier is connected with the output end of the second operational amplifier, the second input end of the fourth operational amplifier is connected with the output end, the positive power supply end is connected with and receives the input signal, the negative power supply end is grounded, and the output end outputs a control signal transmitted by the fourth operational amplifier.
6. The drive system of claim 4, further comprising:
and one end of the first capacitor is connected with the output end of the first operational amplifier, and the other end of the first capacitor is grounded.
7. The driving system as claimed in claim 4, wherein the voltage value of the first reference voltage is related to the voltage value of the active level state of the backlight enable signal, and the level state of the second reference voltage is related to the voltage value of the active level state of the control signal.
8. The drive system of claim 3, wherein the vanishing control circuit comprises:
the control end of the first switch tube is connected with and receives the backlight enabling signal, the first path end of the first switch tube is connected with and receives the input signal, and the second path end of the first switch tube is grounded through a resistor;
the timing end of the edge trigger is connected with the second path end of the first switching tube, and the input end of the edge trigger is connected with and receives the input signal; and
and the control end of the second switch tube is connected with the output end of the edge trigger, the first path end is connected with and receives the input signal, and the second path end is grounded through a resistor and outputs the control signal.
9. The driving system as claimed in claim 3, wherein the power-on operation is performed in response to the input signal changing to an active level state and the backlight enable signal maintaining an inactive level state, and the power-off operation is performed in response to the backlight enable signal changing to an inactive level state and the input signal maintaining an active level state.
10. A display device comprising a display panel and a drive system according to any one of claims 1 to 9 for driving the display panel.
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| CN202020381941.5U CN211150071U (en) | 2020-03-24 | 2020-03-24 | Driving system and display device thereof |
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| CN202020381941.5U CN211150071U (en) | 2020-03-24 | 2020-03-24 | Driving system and display device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115731896A (en) * | 2022-11-29 | 2023-03-03 | 惠科股份有限公司 | Control method of driving circuit, driving circuit and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115731896A (en) * | 2022-11-29 | 2023-03-03 | 惠科股份有限公司 | Control method of driving circuit, driving circuit and display device |
| CN115731896B (en) * | 2022-11-29 | 2023-11-17 | 惠科股份有限公司 | Control method of driving circuit, driving circuit and display device |
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