CN1963907A - Temperature compensating circuit of LCD element - Google Patents
Temperature compensating circuit of LCD element Download PDFInfo
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- CN1963907A CN1963907A CN 200510095530 CN200510095530A CN1963907A CN 1963907 A CN1963907 A CN 1963907A CN 200510095530 CN200510095530 CN 200510095530 CN 200510095530 A CN200510095530 A CN 200510095530A CN 1963907 A CN1963907 A CN 1963907A
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- voltage
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- thermistor
- display panels
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Abstract
This invention discloses one LCD part compensation circuit applied in LCD display panel drive circuit to adjust display panel connection voltage, which is mainly to connect one temperature compensation circuit onto drive power circuit and is composed of heat sensitive resistance and transistor triode and uses heat sensitive resistance temperature property to adjust drive circuit power output voltage to make the LCD panel with good display effect.
Description
[technical field]
The relevant a kind of temperature-compensation circuit of the present invention is meant a kind of temperature-compensation circuit that is applied to LCD element especially.
[background technology]
As shown in Figure 1, existing LCD includes driving power circuit, controller, line driver, row driver and display panel, and the display effect of this display panels can Yin Wendu and is connect the difference of the size of voltage altogether, the voltage that connects altogether that part display panel tool optimal display result is required can increase with the increase of temperature, and the required voltage that connects altogether of part display panel tool optimal display result can reduce with the increase of temperature, need the different characteristics that connects voltage altogether if ignore this kind of display panel with the difference of temperature, then can cause this display panel outside certain temperature range, can produce phenomenons such as flicker, thereby can not keep normal image quality show state.
In view of this, being necessary to develop a kind of difference with temperature according to display panels needs the different characteristics that connects voltage altogether in fact, can be according to the output voltage of the driving power circuit of this display panels of adjustment, altogether the connect voltage of suitable of this display panels under specified temp promptly is provided, thereby makes this display panels under different temperatures, can keep normal image quality show state.
[summary of the invention]
Therefore, the object of the present invention is to provide a kind ofly needs the different characteristics that connects voltage altogether according to display panels with temperature, can be according to the output voltage of the driving power circuit of this display panels of adjustment, altogether the connect voltage of suitable of this display panels under specified temp promptly is provided, thereby makes this display panels under different temperatures, can keep normal image quality show state.
For reaching above-mentioned purpose, the temperature-compensation circuit of LCD element of the present invention is applied on the liquid crystal display displays panel drive circuit, connect voltage (Vcom) altogether in order to the display panel regulated, it mainly is the other temperature-compensation circuit that connects on the driving power circuit of this display panel, drive circuit, this temperature-compensation circuit mainly is made up of thermistor or thermistor and transistor, utilize the temperature characterisitic of thermistor and regulate the output voltage of the driving power circuit of driving circuit, promptly this display panels under specified temp required be fit to connect voltage altogether, thereby make this display panels have preferable display effect.
In the first embodiment of the present invention, driving power circuit of the present invention comprises the DC loop that a power supply, pull-up resistor, potentiometer, resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and be connected with the voltage input end of display panels with what this display panels was provided and connect voltage altogether, and this temperature-compensation circuit is made up of a thermistor, this thermistor is in parallel with resistance, that is the node of one end and resistance and potentiometer series connection is connected, and its other end ground connection.
In the second embodiment of the present invention, driving power circuit of the present invention comprises the DC loop that a power supply, pull-up resistor, potentiometer, resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and be connected with the voltage input end of display panels with what this display panels was provided and connect voltage altogether, and this temperature-compensation circuit is made up of a thermistor, one end of this thermistor is connected with the node of pull-up resistor with the potentiometer series connection, and its other end ground connection.
In the third embodiment of the present invention, driving power circuit of the present invention comprises a power supply, pull-up resistor, potentiometer, the DC loop that resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and be connected with the voltage input end of display panels with what this display panels was provided and connect voltage altogether, and this temperature-compensation circuit is made up of a thermistor and a triode, one end of this thermistor is connected with the base stage of this triode, and the grounded emitter of this triode, and its collector is connected with the node of resistance with the potentiometer series connection, and the end that this thermistor is connected with triode is connected with power supply by another resistance.
In the fourth embodiment of the present invention, driving power circuit of the present invention comprises a power supply, pull-up resistor, potentiometer, the DC loop that resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and be connected with the voltage input end of display panels with what this display panels was provided and connect voltage altogether, and this temperature-compensation circuit is made up of a thermistor and a triode, one end of this thermistor is connected with the base stage of this triode, and the grounded emitter of this triode, and its collector connects the node between pull-up resistor and the potentiometer, and the end that this thermistor is connected with triode is connected with power supply by another resistance.
Compared to prior art, the present invention is by the other temperature-compensation circuit that connects on the driving power circuit of this display panel, drive circuit, utilize the temperature characterisitic of thermistor in this temperature-compensation circuit and regulate the output voltage of the driving power circuit of driving circuit, thereby what offer that this display panels is fit under specified temp connects voltage altogether, and makes this display panels can keep normal image quality show state.
For purpose of the present invention, structural attitude and function thereof are had further understanding, conjunction with figs. is described in detail as follows now:
[description of drawings]
Fig. 1 illustrates the composition frame chart of available liquid crystal display.
Fig. 2 illustrates the circuit diagram of temperature-compensation circuit first embodiment of LCD element of the present invention.
Fig. 3 illustrates the circuit diagram of temperature-compensation circuit second embodiment of LCD element of the present invention.
Fig. 4 illustrates the circuit diagram of temperature-compensation circuit the 3rd embodiment of LCD element of the present invention.
Fig. 5 illustrates the circuit diagram of temperature-compensation circuit the 4th embodiment of LCD element of the present invention.
[embodiment]
See also shown in Figure 1, circuit diagram for temperature-compensation circuit first embodiment of LCD element of the present invention, driving power circuit 1 of the present invention comprises the DC loop that a power Vcc, pull-up resistor R1, potentiometer R2, resistance R 3 and earth terminal are connected in series successively, and the input end R2 of potentiometer R2
1With its travelling arm R2
2Connect, and be connected with the voltage input end of display panels with what this display panels was provided and meet voltage Vcom altogether, and this temperature-compensation circuit 2 is made up of a thermistor R4, this thermistor R4 is in parallel with resistance R 3, that is one end and resistance R 3 be connected with the node of potentiometer R2 series connection, and its other end ground connection.
In the above-described embodiments, can select the thermistor R4 of corresponding types according to the characteristic of this display panels, promptly rise when increasing with temperature when the required voltage that connects altogether of this display panels, then this thermistor should be selected the type that its resistance rises with temperature.Altogether the connect voltage required as this display panels rises when reducing with temperature, and then this thermistor should be selected the type that its resistance descends with the temperature rising.
Below with this display panels required connect altogether voltage with temperature rise increase, this thermistor resistance rises to the temperature-compensation circuit of example explanation LCD element of the present invention with temperature principle of work: when this display panels required connect voltage altogether and increase with the temperature rising time, the resistance of this thermistor R4 rises with the rising of temperature, thereby make the voltage at thermistor R4 two ends rise, and then make the node place voltage between slide-changing resistor R2 and the resistance R 3 rise, thereby cause slide-changing resistor R2 travelling arm R2
2The voltage at place rises, even exporting the voltage of this display panels to, this driving power circuit 1 rises, the characteristic that connects the voltage increase altogether that it is required thereby the temperature that meets this display panels raises can be kept normal image quality show state to make this display panels.
See also shown in Figure 2, circuit diagram for temperature-compensation circuit second embodiment of LCD element of the present invention, the driving power circuit 1 that it disclosed comprises the DC loop that a power Vcc, pull-up resistor R1, potentiometer R2, resistance R 3 and earth terminal are connected in series successively, and the input end R2 of potentiometer R2
1With its travelling arm R2
2Connect, and be connected with the voltage input end of display panels with what this display panels was provided and meet voltage Vcom altogether, and this temperature-compensation circuit 2 is made up of a thermistor R4, and this thermistor R4 one end and pull-up resistor R1 are connected and its other end ground connection with node between the potentiometer R2.In a second embodiment, the type of this thermistor R4 can be selected according to the characteristic of this display panels, and promptly when the voltage of this display panels liquid crystal increased with the temperature rising, then this thermistor should be selected the type that its resistance rises with temperature.Rise when reducing with temperature as the voltage of this display panels liquid crystal, then this thermistor should be selected the type that its resistance reduces with the temperature rising.As for its principle of work, can join the description of first embodiment, repeat no more herein.
See also Fig. 3, circuit diagram for temperature-compensation circuit the 3rd embodiment of LCD element of the present invention, the driving power circuit 1 that it disclosed comprises the DC loop that a power Vcc, pull-up resistor R1, potentiometer R2, resistance R 3 and earth terminal are connected in series successively, and the input end R2 of potentiometer R2
1With its travelling arm R2
2Connect, and be connected with the voltage input end of display panels with what this display panels was provided and meet voltage Vcom altogether, and this temperature-compensation circuit 2 is made up of a thermistor R4 and a transistor Q1, the end of this thermistor R4 is connected with the base stage of this triode Q1, and the grounded emitter of this triode Q1, and its collector connects the node between potentiometer R2 and the resistance R 3, and the end that this thermistor R4 is connected with triode Q1 is connected with power Vcc by one second resistance R 5.Simultaneously, the type of thermistor R4 in the present embodiment can be selected according to the characteristic of this display panels, promptly rise when increasing with temperature when the required voltage that connects altogether of this display panels, then this thermistor should be selected the type that its resistance reduces with the temperature rising.Altogether the connect voltage required as this display panels rises when reducing with temperature, and then this thermistor should be selected the type that its resistance increases with the temperature rising.
Below with this display panels required connect altogether voltage with temperature rise increase, this thermistor resistance is with the rise principle of work of the temperature-compensation circuit that is reduced to example explanation LCD element of the present invention of temperature: altogether the connect voltage required when this display panels rises when increasing with temperature, the resistance of this thermistor R4 reduces with the rising of temperature, thereby make the voltage at thermistor R4 two ends descend, and then the base voltage of triode Q1 descends its base current I
bReduce, thereby make its collector current I
cReduce, thereby make its collector voltage increase, promptly the node place voltage between slide-changing resistor R2 and the resistance R 3 rises, thereby causes slide-changing resistor R2 travelling arm R2
2The voltage at place rises, even exporting the voltage of this display panels to, this driving power circuit 1 rises, the characteristic that connects the voltage increase altogether that it is required thereby the temperature that meets this display panels raises can be kept normal image quality show state to make this display panels.
See also Fig. 4, circuit diagram for temperature-compensation circuit the 4th embodiment of LCD element of the present invention, the driving power circuit 1 that it disclosed comprises the DC loop that a power Vcc, pull-up resistor R1, potentiometer R2, resistance R 3 and earth terminal are connected in series successively, and the input end R2 of potentiometer R2
1With its travelling arm R2
2Connect, and be connected with the voltage input end of display panels with what this display panels was provided and meet voltage Vcom altogether, and this temperature-compensation circuit 2 is made up of a thermistor R4 and a transistor Q1, the end of this thermistor R4 is connected with the base stage of this triode Q1, and the grounded emitter of this triode Q1, and its collector connects the node between pull-up resistor R1 and the potentiometer R2, and the end that this thermistor R4 is connected with triode Q1 is connected with power Vcc by one second resistance R 5.Simultaneously, the type of thermistor R4 in the present embodiment can be selected according to the characteristic of this display panels, promptly rise when increasing with temperature when the required voltage that connects altogether of this display panels, then this thermistor should be selected the type that its resistance reduces with the temperature rising.Altogether the connect voltage required as this display panels rises when reducing with temperature, and then this thermistor should be selected the type that its resistance increases with the temperature rising.As for its principle of work, can join the description of the 3rd embodiment, repeat no more herein.
Compared to prior art, the present invention is by the other temperature-compensation circuit that connects on the driving power circuit of this display panel, drive circuit, utilize the temperature characterisitic of thermistor in this temperature-compensation circuit and regulate the output voltage of the driving power circuit of driving circuit, thereby what offer that this display panels is fit under specified temp connects voltage altogether, and makes this display panels can keep normal image quality show state.
Claims (12)
1, a kind of temperature-compensation circuit of LCD element is applied on the liquid crystal display displays panel drive circuit, in order to the display panel regulated connect voltage altogether, it is characterized in that it comprises:
Driving power circuit, comprise the DC loop that a power supply, pull-up resistor, potentiometer, resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and is connected with the voltage input end of display panels with what this display panels was provided and connects voltage altogether;
Temperature-compensation circuit is made up of a thermistor, and this thermistor one end and potentiometer are connected with node between the resistance, and its other end ground connection;
Borrow said elements, when temperature variation, the resistance of this thermistor is corresponding to change, adjust the voltage at these thermistor two ends thus, and then the voltages at nodes between regulator potentiometer and the resistance, thereby regulate the output voltage of the driving power circuit of this display panels, with provide this display panels specified temp required connect voltage altogether, and make this display panels keep normal image quality show state.
2, the temperature-compensation circuit of LCD element as claimed in claim 1 is characterized in that: the voltage that connects altogether that this display panels is required increases with the temperature rising, and this thermistor should its resistance rise with temperature.
3, the temperature-compensation circuit of LCD element as claimed in claim 1 is characterized in that: the voltage that connects altogether that this display panels is required reduces with the temperature rising, and this thermistor should select its resistance to descend with the temperature rising.
4, a kind of temperature-compensation circuit of LCD element is applied on the liquid crystal display displays panel drive circuit, in order to the display panel regulated connect voltage altogether, it is characterized in that it comprises:
Driving power circuit, comprise the DC loop that a power supply, pull-up resistor, potentiometer, resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and is connected with the voltage input end of display panels with what this display panels was provided and connects voltage altogether;
Temperature-compensation circuit is made up of a thermistor, and this thermistor one end and pull-up resistor are connected with node between the potentiometer, and its other end ground connection;
Borrow said elements, when temperature variation, the resistance of this thermistor is corresponding to change, adjust the voltage at these thermistor two ends thus, and then the voltages at nodes between adjusting pull-up resistor and the potentiometer, thereby regulate the output voltage of the driving power circuit of this display panels, with provide this display panels specified temp required connect voltage altogether, and make this display panels keep normal image quality show state.
5, the temperature-compensation circuit of LCD element as claimed in claim 4 is characterized in that: the voltage that connects altogether that this display panels is required increases with the temperature rising, and this thermistor should its resistance rise with temperature.
6, the temperature-compensation circuit of LCD element as claimed in claim 4 is characterized in that: the voltage that connects altogether that this display panels is required reduces with the temperature rising, and this thermistor should select its resistance to descend with the temperature rising.
7, a kind of temperature-compensation circuit of LCD element is applied on the liquid crystal display displays panel drive circuit, connects voltage altogether in order to what regulate display panel, it is characterized in that it comprises:
Driving power circuit, comprise the DC loop that a power supply, pull-up resistor, potentiometer, resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and is connected with the voltage input end of display panels with what this display panels was provided and connects voltage altogether;
Temperature-compensation circuit, form by a thermistor and a transistor, one end of this thermistor is connected with the base stage of this triode, and the grounded emitter of this triode, and its collector connects the node between potentiometer and the resistance, and the end that this thermistor is connected with triode is connected with power supply by one second resistance;
Borrow said elements, when temperature variation, the resistance of this thermistor is corresponding to change, adjust the voltage at these thermistor two ends thus, be transistor base voltage, and then regulate the collector voltage of this triode, thereby make the voltages at nodes between this potentiometer and the resistance change, thereby regulate the output voltage of the driving power circuit of this display panels, with provide this display panels specified temp required connect voltage altogether, and make this display panels keep normal image quality show state.
8, the temperature-compensation circuit of LCD element as claimed in claim 7 is characterized in that: the voltage that connects altogether that this display panels is required increases with the temperature rising, and this thermistor should its resistance reduce with the temperature rising.
9, the temperature-compensation circuit of LCD element as claimed in claim 7 is characterized in that: the voltage that connects altogether that this display panels is required reduces with the temperature rising, and this thermistor should select its resistance to rise with temperature to be increased.
10, a kind of temperature-compensation circuit of LCD element is applied on the liquid crystal display displays panel drive circuit, in order to the display panel regulated connect voltage altogether, it is characterized in that it comprises:
Driving power circuit, comprise the DC loop that a power supply, pull-up resistor, potentiometer, resistance and earth terminal are connected in series successively, and the input end of potentiometer is connected with its travelling arm, and is connected with the voltage input end of display panels with what this display panels was provided and connects voltage altogether;
Temperature-compensation circuit, form by a thermistor and a transistor, one end of this thermistor is connected with the base stage of this triode, and the grounded emitter of this triode, and its collector connects the node between pull-up resistor and the potentiometer, and the end that this thermistor is connected with triode is connected with power supply by one second resistance;
Borrow said elements, when temperature variation, the resistance of this thermistor is corresponding to change, adjust the voltage at these thermistor two ends thus, be transistor base voltage, and then regulate the collector voltage of this triode, thereby make the voltages at nodes between this pull-up resistor and the potentiometer change, thereby regulate the output voltage of the driving power circuit of this display panels, with provide this display panels specified temp required connect voltage altogether, and make this display panels keep normal image quality show state.
11, the temperature-compensation circuit of LCD element as claimed in claim 7 is characterized in that: the voltage that connects altogether that this display panels is required increases with the temperature rising, and this thermistor should its resistance reduce with the temperature rising.
12, the temperature-compensation circuit of LCD element as claimed in claim 7 is characterized in that: the voltage that connects altogether that this display panels is required reduces with the temperature rising, and this thermistor should select its resistance to rise with temperature to be increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510095530 CN1963907A (en) | 2005-11-10 | 2005-11-10 | Temperature compensating circuit of LCD element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510095530 CN1963907A (en) | 2005-11-10 | 2005-11-10 | Temperature compensating circuit of LCD element |
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|---|---|
| CN1963907A true CN1963907A (en) | 2007-05-16 |
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|---|---|---|---|
| CN 200510095530 Pending CN1963907A (en) | 2005-11-10 | 2005-11-10 | Temperature compensating circuit of LCD element |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833350A (en) * | 2010-03-29 | 2010-09-15 | 东莞市盛星电脑科技有限公司 | Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method |
| CN101312004B (en) * | 2007-05-25 | 2011-10-19 | 索尼株式会社 | Cathode potential control device and method, self-luminous display device and electronic equipment |
| TWI416483B (en) * | 2009-03-12 | 2013-11-21 | Wintek Corp | Temperature compensation method and driving method for liquid crystal display |
| CN104078009A (en) * | 2013-03-25 | 2014-10-01 | 北京京东方光电科技有限公司 | Electrophoretic display driving circuit, implementation method thereof and electrophoretic display device |
| CN105489187A (en) * | 2016-01-27 | 2016-04-13 | 上海天马微电子有限公司 | Circuit for generating common voltage for liquid crystal panel and liquid crystal display thereof |
| WO2017156817A1 (en) * | 2016-03-16 | 2017-09-21 | 深圳市华星光电技术有限公司 | Chamfering circuit for adjustable chamfered waveform and method for adjusting chamfered waveform |
| CN112506261A (en) * | 2020-11-24 | 2021-03-16 | 海博瑞电子(江苏)有限公司 | Automatic voltage compensation circuit for displaying temperature |
| CN113053331A (en) * | 2021-03-25 | 2021-06-29 | Tcl华星光电技术有限公司 | Display panel and liquid crystal display device |
-
2005
- 2005-11-10 CN CN 200510095530 patent/CN1963907A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312004B (en) * | 2007-05-25 | 2011-10-19 | 索尼株式会社 | Cathode potential control device and method, self-luminous display device and electronic equipment |
| TWI416483B (en) * | 2009-03-12 | 2013-11-21 | Wintek Corp | Temperature compensation method and driving method for liquid crystal display |
| CN101833350B (en) * | 2010-03-29 | 2014-12-31 | 国网浙江遂昌县供电公司 | Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method |
| CN101833350A (en) * | 2010-03-29 | 2010-09-15 | 东莞市盛星电脑科技有限公司 | Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method |
| US9767739B2 (en) | 2013-03-25 | 2017-09-19 | Boe Technology Group Co., Ltd. | Driving circuit for electrophoretic display, implementation method thereof and electrophoretic display device |
| CN104078009A (en) * | 2013-03-25 | 2014-10-01 | 北京京东方光电科技有限公司 | Electrophoretic display driving circuit, implementation method thereof and electrophoretic display device |
| CN104078009B (en) * | 2013-03-25 | 2016-04-06 | 北京京东方光电科技有限公司 | The driving circuit of electrophoresis showed and its implementation and electrophoretic display apparatus |
| CN105489187A (en) * | 2016-01-27 | 2016-04-13 | 上海天马微电子有限公司 | Circuit for generating common voltage for liquid crystal panel and liquid crystal display thereof |
| CN105489187B (en) * | 2016-01-27 | 2018-04-10 | 上海天马微电子有限公司 | Circuit for generating common voltage for liquid crystal panel and liquid crystal display thereof |
| WO2017156817A1 (en) * | 2016-03-16 | 2017-09-21 | 深圳市华星光电技术有限公司 | Chamfering circuit for adjustable chamfered waveform and method for adjusting chamfered waveform |
| CN112506261A (en) * | 2020-11-24 | 2021-03-16 | 海博瑞电子(江苏)有限公司 | Automatic voltage compensation circuit for displaying temperature |
| CN113053331A (en) * | 2021-03-25 | 2021-06-29 | Tcl华星光电技术有限公司 | Display panel and liquid crystal display device |
| CN113053331B (en) * | 2021-03-25 | 2022-05-03 | Tcl华星光电技术有限公司 | Display panel and liquid crystal display device |
| US12025876B2 (en) | 2021-03-25 | 2024-07-02 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display panel and liquid crystal display device |
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