CN102789754B - Date driver and display module employing same - Google Patents
Date driver and display module employing same Download PDFInfo
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- CN102789754B CN102789754B CN201110138264.XA CN201110138264A CN102789754B CN 102789754 B CN102789754 B CN 102789754B CN 201110138264 A CN201110138264 A CN 201110138264A CN 102789754 B CN102789754 B CN 102789754B
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Abstract
The invention discloses a date driver and a display module employing the same. According to the data driver and the display module employing the same, the circuit complexity of an external circuit of the display module can be reduced, and the installation cost of the display module can be reduced. The data driver comprises a data line driving circuit and a power supply control circuit. The data line driving circuit is used for driving a plurality of data lines of the display module; and the power supply control circuit is used for controlling a power supply generation circuit outside the data driver so as to generate scanning application voltage used by a scanning driver of the display module.
Description
Technical field
The invention relates to a kind of application of power control circuit, and relate to a kind of data driver of integrating power supply control circuit especially and apply its display module.
Background technology
Power supply unit is the key part and component of all electronic product indispensabilities, and its main application is for providing electronic product to stablize and the power supply of appropriate voltage.The quality of power supply unit, directly will affect the serviceable life of electronic product.In order to improve the quality of power supply unit, a kind of element participating in power supply control function is power supply chip (integrated chip) or power management IC.In the field of display technique, power supply chip is used to provide accurate and stable voltage reference to the various circuit of display module, as scanner driver or data driver.
About the installation of display module, display module can be connected with its external circuit in practice, and form a display.The external circuit of display module comprises a printed circuit board (PCB) (printed circuit board), and external signal is mainly sent into display module by its effect, enables the correct display frame of display module.The external circuit of display module also comprises a connection medium, is used for connecting display module and its external circuitry.According to the demand of display module, deviser can select various connection medium, as coil type engages (Tape CarrierPackage, TCP) the connection medium, covering brilliant film (chip on flex or chip one film, COF) or flexible circuit board (flexible printed circuit) is installed.
Generally speaking, in order to install display module, power supply chip need be arranged on the external circuit of display module, as being arranged on printed circuit board (PCB) or connecting on medium, and coordinates some peripheral circuit elements to produce the required power supply of display module.But this kind of set-up mode can make the circuit complexity of display module external circuit improve, and makes the installation cost of display module increase.
Summary of the invention
The invention provides a kind of data driver and apply its display module, the circuit complexity of display module external circuit can be reduced, and reduce the installation cost of display module.
According to an aspect of the present invention, a kind of data driver is proposed.Data driver is applicable to a display module.Data driver comprises a data line drive circuit and a power control circuit.Data line drive circuit is in order to drive a plurality of data lines of display module.Power control circuit produces in order to a power generation circuit of control data driver outside the one scan applied voltage that the one scan driver of display module uses.
According to a further aspect in the invention, a kind of data driver is proposed.Plant data driver and be applicable to a display module.Data driver comprises a data line drive circuit and a power control circuit.Data line drive circuit is in order to drive a plurality of data lines of display module.Power control circuit is in order to receive a detection signal and to provide a control signal according to this.The one scan applied voltage that the voltage potential of detection signal uses lower than the one scan driver of display module and along with the variation of scanning applied voltage.Control signal is used for the generation of gated sweep applied voltage.
According to a further aspect in the invention, a kind of display module is proposed.Display module comprises a display panel, one scan driver and a data driver.Display panel comprises multi-strip scanning line, many pixels handing over data line more and multiple friendship being arranged at sweep trace and data line more to locate with sweep trace.Scanner driver is in order to receive one scan applied voltage and to drive sweep trace.Data driver comprises a data line drive circuit and a power control circuit.Data line drive circuit is in order to driving data line.Power control circuit produces scanning applied voltage in order to a power generation circuit of control data driver outside.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the calcspar of the display module according to one embodiment of the invention.
Fig. 2 illustrates the schematic diagram of the power-supply controller of electric of Fig. 1 and an example of power generation circuit and coherent signal.
Fig. 3 A ~ 3C respectively illustrates the schematic diagram of an example of the detailed circuit of the power generation circuit of Fig. 1.
Main element symbol description:
100: display module
110: display panel
120: scanner driver
130: data driver
131: data line drive circuit
132: power control circuit
210: printed circuit board (PCB)
211: power generation circuit
211a ~ 211c: electronic circuit
220: flexible circuit board
AVDD: market demand voltage
Ca1 ~ Ca2, Cb1 ~ Cb3, Cc1 ~ Cc2: capacitor
Da1 ~ Da2, Db1 ~ Db3, Dc1: diode
D1 ~ Dm: data line
G1 ~ Gn: sweep trace
Lc1: inductor
Ra1, Ra2, Rb1, Rb2, Rc1, Rc2: resistor
Tc1: transistor
VCC: supply voltage
Vc1, Vc2, Vc2-b, Vc3: control signal
Vd1, Vd2, Vd3: detection signal
VGH, VGL: scanning applied voltage
Embodiment
The invention relates to a kind of data driver and apply its display module, be incorporated in data driver by by power control circuit, the power generation circuit controlling display module outside produces the voltage needed for display module.So, the circuit complexity of display module external circuit can be reduced, thus reduce the installation cost of display module.
Please refer to Fig. 1, it illustrates the calcspar of the display module according to one embodiment of the invention.Display module 100 comprises a display panel 110, one scan driver 120 and a data driver 130.Such as but not can be a LCD MODULE limitedly, its display panel 110 used then can comprise a liquid crystal layer and two relative substrates to display module 100.Display module 100 can connect medium such as flexible circuit board 220 via one and be connected to a printed circuit board (PCB) 210, and forms a display.
Display panel 110 comprises multi-strip scanning line G1 ~ Gn, a plurality of data lines D1 ~ Dm.Data line D1 ~ Dm and sweep trace G1 ~ Gn hands over more.Display panel 110 also comprises the pixel that multiple friendship being arranged at sweep trace G1 ~ Gn and data line D1 ~ Dm is more located.Scanner driver 120 is in order to drive this little sweep trace G1 ~ Gn.Data driver 130 comprises data line drive circuit 131 and a power control circuit 132.Data line drive circuit 131 is in order to driving data line D1 ~ Dm.Power control circuit 132 is used for the generation of one scan applied voltage that gated sweep driver 120 uses.Scanning applied voltage can be produced by a power generation circuit 211.
In an embodiment, power control circuit 132 is such as merge with data line drive circuit 131 to be embodied as a driving chip, power generation circuit 211 is then such as used to some the peripheral circuit elements producing power supply, as capacitor, inductor, resistor and/or diode.As can be seen from Figure 1, power control circuit 132 is the inside being incorporated into display module 100, and power generation circuit 211 is then the outside being arranged on display module 100, as printed circuit board (PCB) 210 or flexible circuit board 220.
Compared to direct practice power supply chip or power management chip being arranged display module 100 outside, power supply chip is divided into two parts by one embodiment of the invention, namely above-mentioned power control circuit 132 and power generation circuit 211, and the data driver 130 power control circuit 132 being incorporated into display module 100 inside.So, the circuit complexity of display module 100 external circuit can be reduced, the installation cost of display module 100 is reduced.
In general, data driver 130 from its external circuit if printed circuit board (PCB) 210 or flexible circuit board 220 belong to different power supply areas (power domain).So-called power supply area is such as used to the scope of definition circuit or voltage that element used or can bear.In the example of an implementation, data driver 130 is such as belong to middle pressure or area of low pressure: about 13 volts or following, and printed circuit board (PCB) 210 and flexible circuit board 220 are such as belong to high-pressure area: about 20 volts.Compared to high-pressure area, the voltage that area of low pressure defines is lower, therefore the required component pressure used of its circuit also can be lower.
From the angle of power supply area and component pressure, printed circuit board (PCB) 210 and flexible circuit board 220 belong to high-pressure area, its component pressure is high, and data driver 130 belongs to middle pressure or area of low pressure, its component pressure is relatively low.Old friend, power control circuit 132 belongs to different power supply areas from power generation circuit 211.In other words, compared to being arranged on high-pressure area, the power control circuit 132 being arranged on middle pressure or area of low pressure can realize with withstand voltage lower element, and has less range of distribution and lower cost.
Please refer to Fig. 2, it illustrates the schematic diagram of the power-supply controller of electric 132 of Fig. 1 and an example of power generation circuit 211 and coherent signal.For the power control circuit 132 belonging to two different electrical power regions and power generation circuit 211, the exchange signal therebetween need through suitable design.In an embodiment, in order to control the power generation circuit 211 of high-pressure area, voltage signal can be designed to meet the middle pressure of power-supply controller of electric 132 or the signal of area of low pressure.
In an embodiment, power control circuit 132 is used for the generation of gated sweep applied voltage VGH.The positive voltage that scanning applied voltage VGH uses for scanner driver 120.In implementation, scanning applied voltage VGH is defined in high-pressure area, as 15 volts.This scanning applied voltage VGH is higher than the component pressure of the power control circuit 132 be incorporated in data driver 130.Therefore power control circuit 132 can receive the detection signal Vd1 lower than scanning applied voltage VGH, and provide a control signal Vc1 to carry out Control of Voltage according to this.This detection signal Vd1 system is along with scanning applied voltage VGH variation, and so as to the change making power control circuit 132 detect scanning applied voltage VGH, and reaction is on its control signal Vc1.
In another embodiment, power control circuit 132 is used for the generation of gated sweep applied voltage VGL.The negative voltage that scanning applied voltage VGL uses for scanner driver 120.In implementation, scanning applied voltage VGL is such as about-10 volts.Similar in the scanning applied voltage VGH of positive potential, power control circuit 132 can receive the detection signal Vd2 of amplitude lower than scanning applied voltage VGL, and provides a control signal Vc2 to carry out Control of Voltage according to this.
In another embodiment, power control circuit 132 is more used for the generation of control data applied voltage AVDD.The voltage that market demand voltage AVDD uses for data driver 130.In implementation, market demand voltage AVDD is such as about 10 volts.Similar in scanning applied voltage VGH or VGL, power control circuit 132 also can receive the detection signal Vd3 lower than market demand voltage AVDD, and provides a control signal Vc3 to carry out Control of Voltage according to this.
In this little embodiment, detecting voltage Vd1 ~ Vd3 can have different embodiments according to different circuit design.In an embodiment, detect the dividing potential drop that voltage Vd1 is such as scanning applied voltage VGH.In other words, power generation circuit 211 is such as in the mode of resistance string, and the dividing potential drop of the power supply area of power generation circuit 211 is fed back to power control circuit 132, using the Control of Voltage benchmark as power control circuit 132.The implementation method detecting voltage Vd2 and Vd3 is also similar.
Please refer to Fig. 3 A ~ 3C, it respectively illustrates the schematic diagram of an example of the detailed circuit of the power generation circuit 211 of Fig. 1.In this example, power generation circuit 211 comprises three electronic circuit 211a ~ 211c, respectively in order to produce the scanning applied voltage VGH of positive potential, the scanning applied voltage VGL of negative potential and market demand voltage AVDD.
As shown in Figure 3A, electronic circuit 211a illustrated for a charge pump (charge pump) circuit.Electronic circuit 211a comprises multiple circuit component as capacitor Ca1 ~ Ca2 and diode Da1 ~ Da2.The resistance string that electronic circuit 211a is formed via resistor Ra1, Ra2, using the dividing potential drop of scanning applied voltage VGH as detecting voltage Vd1 and feeding back to power control circuit 132.By resistor Ra1 and Ra2 of different proportion, detect voltage Vd1 and can meet the withstand voltage of power control circuit 132.The control signal Vc1 that power-supply controller of electric 132 provides is such as a charge pump control signal.Power-supply controller of electric 132 is such as the current potential that the mode that changes signal potential or amplitude carrys out gated sweep applied voltage VGH.In this example, tentation data applied voltage AVDD is 13V, and the activation current potential of control signal Vc1 is such as 13V, and so, scanning applied voltage VGH is two multiplication of voltages, as 26V.
As shown in Figure 3 B, the embodiment of electronic circuit 211b is similar in electronic circuit 211a, and it comprises multiple circuit component as capacitor Cb1 ~ Cb3 and diode Db1 ~ Db3.Under the bias voltage of supply voltage VCC, the resistance string that electronic circuit 211b is formed via resistor Rb1, Rb2, using the dividing potential drop of scanning applied voltage VGL as detection voltage Vd2.Suppose that the activation current potential of control signal Vc2 is 13V, then its inversion signal Vc2-b then has reversal potential as 0V.Direction according to diode is known, and scanning applied voltage VGL can have negative potential.Electronic circuit 211b to make flowing mode similar in electronic circuit 211a, therefore not describe in detail.
As shown in Figure 3 C, electronic circuit 211c illustrated for a pulse width modulation (pulse width modulation, PWM) circuit.Electronic circuit 211c comprises multiple circuit component as capacitor Cc1 ~ Cc2, diode Dc1, inductor Lc1, transistor Tc1 and resistor Rc1, Rc2.Electronic circuit 211c produces via the feedback of resistor Rc2 and detects voltage Vd3.In this example, power-supply controller of electric 132 provide control signal Vc3 to be a pwm control signal, its amplitude is such as the current potential of supply voltage VCC, as 3.3V.Power-supply controller of electric 132 is such as the current potential that the mode that changes signal pulsewidth carrys out control data applied voltage AVDD.
In the example described in Fig. 3, by pwm circuit, supply voltage VCC (as 3.3V) can be promoted to higher market demand voltage AVDD (as 13V), relend, by charge pump circuit, market demand voltage AVDD is converted to higher scanning applied voltage VGH (as 20V) or the scanning applied voltage VGL (as-10V) of negative potential.So, the generation of high voltage just can be controlled with withstand voltage lower circuit.Right the present invention is also not limited thereto.
According to data driver described in the above embodiments of the present invention and display module thereof, lie in data driver and incorporate a power control circuit, can be used for the generation of the voltage controlled needed for display module.So, the circuit complexity of display module external circuit can be reduced, thus improve the installation cost of display module.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (15)
1. a data driver, is applicable to a display module, and this data driver comprises:
One data line drive circuit, in order to drive a plurality of data lines of this display module; And
One power control circuit, the one scan applied voltage that the one scan driver that the power generation circuit in order to control this data driver outside produces this display module uses;
Wherein, this power control circuit is in order to receive a detection signal and to provide a control signal according to this, and this detection signal is along with the variation of this scanning applied voltage, and this control signal is for controlling the generation of this scanning applied voltage.
2. data driver as claimed in claim 1, is characterized in that, this power control circuit more produces in order to control this power generation circuit the market demand voltage that this data driver uses.
3. data driver as claimed in claim 1, it is characterized in that, this detection signal is lower than this scanning applied voltage.
4. data driver as claimed in claim 3, it is characterized in that, this detection signal is a dividing potential drop of this scanning applied voltage.
5. data driver as claimed in claim 3, it is characterized in that, this control signal is a charge pump signal or a pulse width modulation signal.
6. data driver as claimed in claim 1, it is characterized in that, this power control circuit belongs to different power supply areas from this power generation circuit.
7. data driver as claimed in claim 1, it is characterized in that, the component pressure of this power control circuit is lower than this scanning applied voltage.
8. a data driver, is applicable to a display module, and this data driver comprises:
One data line drive circuit, in order to drive a plurality of data lines of this display module; And
One power control circuit, in order to receive a detection signal and to provide a control signal according to this, the one scan applied voltage that the voltage potential of this detection signal uses lower than the one scan driver of this display module and along with the variation of this scanning applied voltage, and this control signal is for controlling the generation of this scanning applied voltage.
9. data driver as claimed in claim 8, it is characterized in that, this power control circuit is more in order to receive another detection signal and to provide another control signal according to this, the market demand voltage that the voltage potential of this another detection signal uses lower than this data driver and along with this market demand variation in voltage, and this another control signal is for controlling the generation of this market demand voltage.
10. data driver as claimed in claim 8, it is characterized in that, this detection signal is a dividing potential drop of this scanning applied voltage.
11. data drivers as claimed in claim 8, is characterized in that, this control signal is a charge pump signal or a pulse width modulation signal.
12. data drivers as claimed in claim 8, it is characterized in that, this control signal is provided to a power generation circuit of this data driver outside, and makes this power generation circuit produce this scanning applied voltage.
13. data drivers as claimed in claim 12, it is characterized in that, this power control circuit belongs to different power supply areas from this power generation circuit.
14. data drivers as claimed in claim 8, is characterized in that, the component pressure of this power control circuit is lower than this scanning applied voltage.
15. 1 kinds of display modules, comprising:
One display panel, comprising:
Multi-strip scanning line;
A plurality of data lines, hands over more with those sweep traces; And
Multiple pixel, the friendship being arranged at those sweep traces and those data lines is more located;
One scan driver, in order to receive one scan applied voltage and to drive those sweep traces; And
One data driver, comprising:
One data line drive circuit, in order to drive those data lines; And
One power control circuit, the power generation circuit in order to control this data driver outside produces this scanning applied voltage;
Wherein, this power control circuit is in order to receive a detection signal and to provide a control signal according to this, and this detection signal is along with the variation of this scanning applied voltage, and this control signal is for controlling the generation of this scanning applied voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110138264.XA CN102789754B (en) | 2011-05-17 | 2011-05-17 | Date driver and display module employing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110138264.XA CN102789754B (en) | 2011-05-17 | 2011-05-17 | Date driver and display module employing same |
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| Publication Number | Publication Date |
|---|---|
| CN102789754A CN102789754A (en) | 2012-11-21 |
| CN102789754B true CN102789754B (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110138264.XA Expired - Fee Related CN102789754B (en) | 2011-05-17 | 2011-05-17 | Date driver and display module employing same |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110738963B (en) * | 2018-07-20 | 2021-10-01 | 矽创电子股份有限公司 | Display driving circuit |
| CN112072913B (en) * | 2020-09-22 | 2021-10-29 | 禹创半导体(深圳)有限公司 | High-compatibility power supply framework for driving display IC |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664909A (en) * | 2005-04-13 | 2005-09-07 | 友达光电股份有限公司 | LCD and integrated drive chips |
| CN101577097A (en) * | 2008-05-08 | 2009-11-11 | 奇美电子股份有限公司 | Liquid crystal display device module and voltage generating circuit thereof |
| CN101676782A (en) * | 2008-09-18 | 2010-03-24 | 北京京东方光电科技有限公司 | TFT-LCD drive circuit |
| US20100118011A1 (en) * | 2008-10-29 | 2010-05-13 | Ssu-Chieh Yang | Display system |
-
2011
- 2011-05-17 CN CN201110138264.XA patent/CN102789754B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664909A (en) * | 2005-04-13 | 2005-09-07 | 友达光电股份有限公司 | LCD and integrated drive chips |
| CN101577097A (en) * | 2008-05-08 | 2009-11-11 | 奇美电子股份有限公司 | Liquid crystal display device module and voltage generating circuit thereof |
| CN101676782A (en) * | 2008-09-18 | 2010-03-24 | 北京京东方光电科技有限公司 | TFT-LCD drive circuit |
| US20100118011A1 (en) * | 2008-10-29 | 2010-05-13 | Ssu-Chieh Yang | Display system |
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| CN102789754A (en) | 2012-11-21 |
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