CN214226488U - Source electrode driving circuit and liquid crystal display device - Google Patents
Source electrode driving circuit and liquid crystal display device Download PDFInfo
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- CN214226488U CN214226488U CN202120354698.2U CN202120354698U CN214226488U CN 214226488 U CN214226488 U CN 214226488U CN 202120354698 U CN202120354698 U CN 202120354698U CN 214226488 U CN214226488 U CN 214226488U
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Abstract
The source driving circuit is connected to a source line of a liquid crystal display panel and provides a gray scale voltage signal for the liquid crystal display panel, wherein a common electrode opposite to a pixel electrode in the liquid crystal display panel is grounded, the source driving circuit comprises a gamma corrector, and the gamma corrector provides a first gray scale voltage signal to the source line according to a second gray scale voltage signal and a correction voltage signal so as to adjust the first gray scale voltage signal provided to the source line according to the correction voltage signal, eliminate the feed-through effect influence in the liquid crystal display panel and guarantee the display effect. The liquid crystal display device comprises the source electrode driving circuit, and the effect of feed-through effect is eliminated by utilizing the gray scale voltage signals received by the source electrode lines, so that the display effect is ensured.
Description
Technical Field
The utility model relates to a show technical field, specifically, relate to source drive circuit and liquid crystal display device.
Background
A TFT-LCD (Thin Film Transistor Liquid Crystal Display) is one of the major types of flat panel displays, and has become an important Display platform in modern IT and video products.
In the liquid crystal display panel, as shown in fig. 1, a gate line GL is connected to a gate terminal G of a thin film transistor M, a source line SL is connected to a drain terminal D of the thin film transistor M, a source terminal S of the thin film transistor M is connected to a pixel electrode for outputting a pixel electrode voltage Vs (gray scale voltage), a storage capacitor Cst and a parasitic capacitor Clc are included between the pixel electrode and a common electrode, a first terminal of the storage capacitor Cst and the parasitic capacitor Clc receives the pixel voltage Vs, and a second terminal thereof receives a common voltage Vcom through the common electrode.
Referring to FIG. 2, the common voltage Vcom is generally fixed at 0V, the gray scale voltages include positive voltages and negative voltages, the voltage values of the gray scale voltages are generally between V1-V14, for example, 8 bits, the selectable values of the gray scale voltages include 256 gray scales L0-L255, and in the flicker test, T is a voltage value of Tn-1To TnAnd Tn+1To Tn+2Gray scale voltage T corresponding to each gray scale of positive voltagenTo Tn+1Gray scale voltages corresponding to respective gray scales of the negative voltage. The parasitic capacitor Clc has a feed-through effect (feedthrough effect), a certain voltage is present on the parasitic capacitor Clc, and is superimposed with a gray scale voltage input by the source line SL in the display driving, so that a difference between the gray scale voltage and a first terminal voltage of the actual storage capacitor Cst and the parasitic capacitor Clc is Δ V1 or Δ V2, a difference between the actual pixel electrode voltage Vs and the common electrode voltage Vcom is wholly higher than Δ V1 or lower than Δ V2, and the actual gray scale is inconsistent with the required gray scale, which affects the actual display effect.
In the prior art, the common voltage Vcom is adjusted to eliminate the deviation, and the difference between the pixel electrode voltage Vs and the common voltage Vcom is ensured to be consistent with the requirement, so as to ensure the display effect, but the common voltage Vcom is easily affected by the in-plane coupling of the liquid crystal display panel, and the actual adjustment effect is not good.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a source driving circuit and a liquid crystal display device, so as to improve the effect of eliminating the feed-through effect and improve the display effect.
According to an aspect of the present invention, there is provided a source driving circuit connected to a source line of a liquid crystal display panel for supplying a gray scale voltage signal to the liquid crystal display panel,
a common electrode in the liquid crystal display panel opposite to the pixel electrode is grounded,
the source electrode driving circuit comprises a gamma corrector and a signal converter, wherein the gamma corrector is arranged on a gray scale voltage signal output path of the source electrode driving circuit, the gamma corrector comprises a second gray scale voltage signal input end, a correction voltage signal input end and a first gray scale voltage signal output end, the first gray scale voltage signal output end of the gamma corrector is coupled to the source electrode line, and the second gray scale voltage signal input end of the gamma corrector is electrically connected with the signal converter.
Optionally, the gamma corrector comprises:
the output ends of the adder and the subtracter are connected to the first gray scale voltage signal output end of the gamma corrector;
and the selection unit comprises a first selection channel and a second selection channel, and a second gray scale voltage signal input end and a correction voltage signal input end of the gamma corrector are both coupled to the input ends of the adder and the subtracter through the first selection channel and the second selection channel.
Optionally, an input of the selection unit is coupled to an output of the signal converter.
Optionally, the signal converter comprises:
the digital-to-analog converter comprises a gamma voltage signal input end, a display signal input end, a gamma correction voltage signal input end, a second gray scale voltage signal output end connected to the second gray scale voltage signal input end of the gamma corrector, and a correction voltage signal output end connected to the correction voltage signal input end of the gamma corrector.
Optionally, the source driving circuit further includes:
a buffer disposed between the first grayscale voltage signal output terminal of the gamma corrector and the source line.
Optionally, the gamma correction voltage signal input terminal is an IIC data interface connected to the timing controller.
Optionally, a gamma voltage signal input end of the digital-to-analog converter is electrically connected to the gamma buffer and receives a gamma voltage signal.
Optionally, the signal converter further comprises an analog-to-digital converter, the analog-to-digital converter comprising a gamma voltage signal input, a display signal input, and a second gray scale voltage signal output;
the gamma corrector includes:
a digital adder including a first input terminal connected to the second gray scale voltage signal output terminal of the analog-to-digital converter, a second input terminal coupled to the correction voltage signal input terminal, and a second gamma voltage signal output terminal;
and the digital-to-analog converter comprises an input end connected with the second gamma voltage signal output end and an output end connected with the first gray scale voltage signal output end.
Optionally, the gamma correction voltage signal input terminal is an IIC data interface connected to the timing controller.
According to another aspect of the present invention, there is provided a liquid crystal display device, comprising:
according to the utility model provides a source drive circuit.
The utility model provides a source drive circuit is connected to liquid crystal display panel's source line, provides grey scale voltage signal for liquid crystal display panel, wherein, the common electrode ground connection relative with the pixel electrode in this liquid crystal display panel, this source drive circuit is including setting up the gamma corrector on source drive circuit's grey scale voltage signal output path, this gamma corrector includes second grey scale voltage signal input part, correction voltage signal input part and first grey scale voltage signal output part, this first grey scale voltage signal output part coupling is in the source line to adjust the first grey scale voltage signal who provides to the source line according to correcting voltage signal, eliminate the feed-through effect influence among the liquid crystal display panel, guarantee display effect.
The utility model provides a liquid crystal display device includes the utility model provides a source drive circuit can be with gamma correction voltage stack to first grey scale voltage signal in to eliminate feed through effect influence, guarantee display effect.
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 illustrates a partial structural schematic view of a liquid crystal display panel according to the related art;
FIG. 2 is a schematic diagram showing gray scale voltage states of a liquid crystal display panel according to the prior art;
fig. 3 is a schematic view showing a part of a structure of a liquid crystal display device according to an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a source driver circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a gamma correction principle of a source driver circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a digital circuit of a gamma corrector of a source driving circuit according to an embodiment of the present invention;
fig. 7 is a schematic view illustrating a gray scale voltage output process of the liquid crystal display device according to 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. 3 is a schematic diagram illustrating a partial structure of a liquid crystal display device according to an embodiment of the present invention. The difference between the partial structure of the liquid crystal display device of the embodiment of the present invention and the partial structure of the prior art shown in fig. 1 is that the common electrode of this embodiment is grounded, and the second end of the corresponding storage capacitor Cst and the parasitic capacitor Clc is grounded, so that the coupling effect to the common electrode in the liquid crystal display panel surface can be avoided, the stability of the voltage of the common electrode is ensured, and the common voltage Vcom is stabilized to 0V.
Fig. 4 shows a schematic structural diagram of a source driver circuit according to an embodiment of the present invention.
As shown in fig. 4, the source driving circuit 200 of the embodiment of the present invention receives the display DATA signal DATA, the gamma voltage signals (V1-V14, the gamma voltage generally includes a 14-level) and the gamma correction voltage signal Δ V, and after the combination and superposition, provides the first gray scale voltage signal to output to the source line SL of the liquid crystal display panel, the offset corresponding to the gamma correction voltage signal Δ V in the first gray scale voltage signal matches with the voltage influence caused by the feed-through effect, so as to eliminate the influence of the feed-through effect, so that the actual pixel electrode voltage Vs is consistent with the required pixel electrode voltage Vs, thereby ensuring the actual gray scale of each pixel unit is consistent with the requirement, and ensuring the display effect.
The source driving circuit 200 of the present embodiment includes a receiver 210 (a display DATA signal input end), a shift register 220, a line buffer 230, a level shifter 240, a signal converter, a gamma corrector 260, a buffer 270, and an output interface 202, which are connected in sequence, for receiving the display DATA signal DATA and providing a first gray scale voltage signal output. The signal converter in the present embodiment is illustrated by taking the digital-to-analog converter 250 as an example, but not limited thereto. In addition, the source driving circuit 200 of the present embodiment further includes an IIC data interface 201 (gamma correction voltage signal input terminal) for receiving the gamma correction voltage signal Δ V, and a gamma voltage signal input terminal for receiving the gamma correction voltage signal Δ V and the gamma voltage signal, respectively.
In the processing chain of the source driving circuit 200, the digital-to-analog converter 250 receives the display data signal, the gamma voltage signal and the gamma correction voltage signal Δ V converted into digital signals, converts the digital signals into analog signals, provides the analog signals to the gamma corrector 260 for synthesis and superposition, outputs the first gray scale voltage signal after being processed by the buffer 270 to the output structure, and outputs the first gray scale voltage signal to the source line SL through the output interface 202 to perform source driving for display. The buffer 270 can ensure the driving capability of the first gray scale voltage signal to the outside, the source driving capability and the display driving reliability.
The gamma voltage signals are transmitted to the source driving circuit 200 through the gamma buffer 300, so as to ensure the reliability of the gamma voltage signals received by the source driving circuit 200. The gamma correction voltage signal Δ V and the display DATA signal DATA are both provided from the timing controller 100 (e.g., a panel driving board), wherein a specific value of the gamma correction voltage signal Δ V is determined by a fixed parameter after the device is generated, and is generally a fixed value, which may be preset or obtained by detection.
Fig. 5 is a schematic diagram illustrating a gamma correction principle of the source driving circuit according to an embodiment of the present invention.
As shown in fig. 5, the dac 250 provides a second gray-scale voltage signal to the gamma corrector 260 according to the display DATA signal DATA and the gamma voltage signal, and provides an analog correction voltage signal to the gamma corrector 260 according to the gamma correction voltage signal Δ V.
The selection unit 261 of the gamma corrector 260 includes a first selection channel and a second selection channel, each of which includes two input terminals coupled to the output terminal of the digital-to-analog converter 250 to respectively receive the gamma voltage signal to provide a second gray scale voltage signal, and output terminals connected to the adder 262 and the subtractor 263 to control selection of providing the correction voltage signal and the second gray scale voltage signal to the adder 262 or the subtractor 263, adding or subtracting a level of the correction voltage signal to or from a level of the second gray scale voltage signal to obtain a first gray scale voltage signal level, and the first gray scale voltage signal is output to the buffer 270, and the level of the first gray scale voltage signal is output through the buffer 270 to perform source driving.
Fig. 6 is a schematic structural diagram of a digital circuit of a gamma corrector of a source driving circuit according to an embodiment of the present invention.
Referring to fig. 6, the present embodiment is different from the above embodiments in that the signal converter in the present embodiment includes an analog-to-digital converter 51, and the analog-to-digital converter 51 includes a gamma voltage signal input terminal, a display signal input terminal, and a second gray scale voltage signal output terminal; the gamma corrector comprises a digital adder 263 including a first input terminal connected to the second gray scale voltage signal output terminal of the analog-to-digital converter, a second input terminal coupled to the correction voltage signal input terminal, and a second gamma voltage signal output terminal; an input terminal of the digital-to-analog converter 52 is connected to the second gamma voltage signal output terminal, and an output terminal of the digital-to-analog converter 52 is connected to the first gray scale voltage signal output terminal, that is, electrically connected to the buffer 270. The digital adder 263 is a 16-ary digital adder, processes digital signals, converts the analog gamma voltage signals into 16-ary digital signals (second gray scale voltage signals) through the analog-to-digital converter 51 and transmits the 16-ary digital signals to the digital adder 263, transmits the 16-ary digital gamma correction voltage signals Δ V to the digital adder 263 through the IIC data interface 201 (the gamma correction voltage signals Δ V obtained from the timing controller 100 through the IIC data interface 201 are digital signals, which correspond to the correction voltage signals in the embodiment shown in fig. 5, and in the present embodiment, correspond to the digital adder, and are directly provided to the digital adder for calculation), and the digital adder 263 directly performs addition and subtraction on the gamma voltage signals converted into digital signals and the gamma correction voltage signals Δ V (which are positive voltage signals or negative voltage signals, and signed addition operation can directly implement addition and subtraction, addition and subtraction can be realized only by providing an adder, and hardware cost is saved) addition and superposition, and the output signal is converted into an analog quantity by the digital-to-analog converter 52, so that the corrected first gray-scale voltage signal can be obtained. Wherein, the utility model discloses be not limited to 16 system's operations, still can select according to the actual specification of equipment according to actual 2 system operations, 8 system operations etc. in order to improve the compatibility.
Fig. 7 is a schematic view illustrating a gray scale voltage output process of the liquid crystal display device according to an embodiment of the present invention.
As shown in fig. 7, the gray scale voltage output process of the liquid crystal display device according to the embodiment of the present invention includes:
step S10: and detecting a flicker picture. And driving the liquid crystal display panel to display the test picture and acquiring the actual display picture of the test picture.
Step S20: and judging whether the flicker picture needs to be adjusted or not. That is, the gray scale of the actual display image is compared with the gray scale of the test image to determine whether the gray scales are consistent.
Step S21: the gamma corrector performs corresponding addition and subtraction correction on the gray scale voltage. When the gray scale of the actual display picture is not consistent with the gray scale of the test picture, a gamma corrector provides a superposition quantity to the gray scale voltage, and the superposition quantity is a positive voltage or a negative voltage so as to enable the gray scale of the actual display picture to be consistent with the gray scale of the test picture. After correction, step S30 is performed: and outputting the signal. Namely, the subsequent gray voltage signals are output after being superposed by a superposition amount, so that the influence of feed-through effect is reduced, and the actual display picture is ensured to be consistent with the original picture.
Step S22: the gamma corrector does not perform addition and subtraction correction on the gray scale voltage. That is, when the gray scale of the actual display screen is consistent with the gray scale of the test screen, it is determined that the flicker screen does not need to be adjusted, the gamma corrector is controlled not to perform addition and subtraction correction on the gray scale voltage, and the step S30 is performed directly: and outputting the signal. Namely, the original gray scale voltage signal is directly used as the final gray scale voltage signal to carry out source electrode driving.
The detection can be realized by the timing controller 100 (prior art, not described in detail here), and the gamma correction voltage signal Δ V corresponding to a positive voltage, a negative voltage or a zero voltage is provided according to a difference between the gray scale of the actual display frame and the gray scale of the test frame, and the gamma correction voltage signal Δ V corresponding to the zero voltage is provided, so that no correction can be performed.
The utility model discloses a source drive circuit is connected to liquid crystal display panel's source line, provide grey scale voltage signal for liquid crystal display panel, wherein, the common electrode ground connection relative with the pixel electrode in this liquid crystal display panel, the stability of common electrode voltage has been ensured, this source drive circuit provides first grey scale voltage signal according to showing data signal and gamma voltage signal and is used for liquid crystal display panel's source drive, wherein, this source drive circuit still receives gamma correction voltage signal, with gamma correction voltage stack to first grey scale voltage signal, with the influence of correction feed-through effect, the grey level of each pixel of guarantee actual display picture is identical with the demand, display effect has been promoted effectively.
The utility model provides a liquid crystal display device includes the utility model provides a source drive circuit, this liquid crystal display device's liquid crystal display panel's common electrode ground connection, the influence of feed through effect is rectified through the first grey scale voltage signal that the source line provided, and the grey scale of each pixel of guarantee actual display picture is identical with the demand, has promoted display effect effectively.
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. The present invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A source driving circuit connected to source lines of a liquid crystal display panel for providing gray scale voltage signals to the liquid crystal display panel,
a common electrode in the liquid crystal display panel opposite to the pixel electrode is grounded,
the source electrode driving circuit comprises a gamma corrector and a signal converter, wherein the gamma corrector is arranged on a gray scale voltage signal output path of the source electrode driving circuit, the gamma corrector comprises a second gray scale voltage signal input end, a correction voltage signal input end and a first gray scale voltage signal output end, the first gray scale voltage signal output end of the gamma corrector is coupled to the source electrode line, and the second gray scale voltage signal input end of the gamma corrector is electrically connected with the signal converter.
2. The source driver circuit according to claim 1, wherein the gamma corrector comprises:
the output ends of the adder and the subtracter are connected to the first gray scale voltage signal output end of the gamma corrector;
and the selection unit comprises a first selection channel and a second selection channel, and a second gray scale voltage signal input end and a correction voltage signal input end of the gamma corrector are both coupled to the input ends of the adder and the subtracter through the first selection channel and the second selection channel.
3. The source driver circuit according to claim 2,
the input end of the selection unit is coupled with the output end of the signal converter.
4. The source driver circuit according to claim 1, wherein the signal converter comprises:
the digital-to-analog converter comprises a gamma voltage signal input end, a display signal input end, a gamma correction voltage signal input end, a second gray scale voltage signal output end connected to the second gray scale voltage signal input end of the gamma corrector, and a correction voltage signal output end connected to the correction voltage signal input end of the gamma corrector.
5. The source driver circuit according to claim 4, further comprising:
a buffer disposed between the first grayscale voltage signal output terminal of the gamma corrector and the source line.
6. The source driver circuit according to claim 4,
the gamma correction voltage signal input end is an IIC data interface and is connected with the time sequence controller.
7. The source driver circuit according to claim 4,
the gamma voltage signal input end of the digital-to-analog converter is electrically connected with the gamma buffer and receives the gamma voltage signal.
8. The source driver circuit according to claim 1,
the signal converter comprises an analog-to-digital converter, and the analog-to-digital converter comprises a gamma voltage signal input end, a display signal input end and a second gray scale voltage signal output end;
the gamma corrector includes:
a digital adder including a first input terminal connected to the second gray scale voltage signal output terminal of the analog-to-digital converter, a second input terminal coupled to the correction voltage signal input terminal, and a second gamma voltage signal output terminal;
and the digital-to-analog converter comprises an input end connected with the second gamma voltage signal output end and an output end connected with the first gray scale voltage signal output end.
9. The source driver circuit according to claim 8,
the correction voltage signal input end is an IIC data interface and is connected with the time sequence controller.
10. A liquid crystal display device, comprising:
the source driver circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120354698.2U CN214226488U (en) | 2021-02-08 | 2021-02-08 | Source electrode driving circuit and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120354698.2U CN214226488U (en) | 2021-02-08 | 2021-02-08 | Source electrode driving circuit and liquid crystal display device |
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| CN214226488U true CN214226488U (en) | 2021-09-17 |
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| CN202120354698.2U Active CN214226488U (en) | 2021-02-08 | 2021-02-08 | Source electrode driving circuit and liquid crystal display device |
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- 2021-02-08 CN CN202120354698.2U patent/CN214226488U/en active Active
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