CN102789754A - Date driver and display module employing same - Google Patents
Date driver and display module employing same Download PDFInfo
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- CN102789754A CN102789754A CN201110138264XA CN201110138264A CN102789754A CN 102789754 A CN102789754 A CN 102789754A CN 201110138264X A CN201110138264X A CN 201110138264XA CN 201110138264 A CN201110138264 A CN 201110138264A CN 102789754 A CN102789754 A CN 102789754A
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- applied voltage
- data driver
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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 particularly relevant for a kind of data driver of integrating power supply control circuit and use its display module.
Background technology
Power supply unit is the indispensable key parts and components of all electronic products, and its main application is the power supply that the stable and appropriate voltage of electronic product is provided.The quality of power supply unit will directly influence serviceable life of electronic product.In order to improve the quality of power supply unit, a kind of element of 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 the various circuit that accurate and stable voltage reference is given display module, like scanner driver or data driver.
The installation of relevant display module can be connected display module in practice, and form a display with its external circuit.The external circuit of display module comprises a printed circuit board (PCB) (printed circuit board), and its effect mainly is that external signal is sent into display module, makes correctly display frame of display module.The external circuit of display module also comprises one and connects media, is used for connecting display module and its external circuit system.Demand according to display module; The deviser can select various connection media for use; Engage (Tape Carrier Package like coil type; TCP), cover brilliant film (chip on flex or chip one film, COF) or the connection media of flexible circuit board (flexible printed circuit) install.
Generally speaking, for display module is installed, power supply chip need be arranged on the external circuit of display module, as is arranged on printed circuit board (PCB) or the connection media, and cooperates some peripheral circuit elements to produce the required power supply of display module.Yet this kind set-up mode can make the circuit complexity of display module external circuit improve, and the installation cost of display module is increased.
Summary of the invention
The present invention provides a kind of data driver and uses its display module, can reduce the circuit complexity of display module external circuit, and reduces 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 many data lines of display module.Power control circuit produces the employed one scan applied voltage of one scan driver of display module in order to the outside power generation circuit of control data driver.
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 many data lines of display module.Power control circuit is in order to receive a detection signal and a control signal is provided according to this.The voltage potential of detection signal is lower than the employed one scan applied voltage of one scan driver of display module and changes along with 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, reaches a data driver.Display panel comprises that multi-strip scanning line, many and sweep trace hand over more data line, and the pixel located more of a plurality of friendships that are arranged at sweep trace and data line.Scanner driver is in order to receive one scan applied voltage and driven sweep line.Data driver comprises a data line drive circuit and a power control circuit.Data line drive circuit is in order to driving data lines.Power control circuit produces the scanning applied voltage in order to the outside power generation circuit of control data driver.
Description of drawings
For let above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, elaborate below in conjunction with the accompanying drawing specific embodiments of the invention, wherein:
Fig. 1 illustrates the calcspar according to a display module of one embodiment of the invention.
Fig. 2 illustrates the synoptic diagram of an example of power-supply controller of electric and power generation circuit and the coherent signal of Fig. 1.
Fig. 3 A～3C respectively illustrate Fig. 1 power generation circuit detailed circuit one the example synoptic diagram.
The 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: data applied 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 use its display module,, control the outside power generation circuit of display module and produce the required voltage of display module by power control circuit is incorporated in the data driver.So, can reduce the circuit complexity of display module external circuit, thereby reduce the installation cost of display module.
Please with reference to Fig. 1, it illustrates the calcspar according to a display module of one embodiment of the invention.Display module 100 comprises a display panel 110, one scan driver 120, an and data driver 130.Display module 100 for example but not can be a LCD MODULE limitedly, the display panel 110 of its use then can comprise a liquid crystal layer and two opposing substrates.Display module 100 can be connected to a printed circuit board (PCB) 210 via a connection media such as flexible circuit board 220, and forms a display.
Display panel 110 comprises multi-strip scanning line G1～Gn, many data line D1～Dm.Data line D1～Dm and sweep trace G1～Gn hands over more.Display panel 110 also comprises the pixel that a plurality of friendships that are arranged at sweep trace G1～Gn and data line D1～Dm are located more.Scanner driver 120 is in order to drive this a little sweep trace G1～Gn.Data driver 130 comprises a data line drive circuit 131 and a power control circuit 132.Data line drive circuit 131 is in order to driving data lines D1～Dm.Power control circuit 132 is used for the generation of gated sweep driver 120 employed one scan applied voltages.The scanning applied voltage can be by 211 generations of a power generation circuit.
In an embodiment; Power control circuit 132 for example is to merge with data line drive circuit 131 to be embodied as a chip for driving; Power generation circuit 211 then for example is some peripheral circuit elements that are used for producing power supply, like capacitor, inductor, resistor and/or diode.Can know that from Fig. 1 power control circuit 132 is the inside that is incorporated into display module 100, power generation circuit 211 then is arranged on the outside of display module 100, like printed circuit board (PCB) 210 or flexible circuit board 220.
Compared to directly power supply chip or power management chip being provided with the outside practice of display module 100; One embodiment of the invention are divided into two parts with power supply chip; Be above-mentioned power control circuit 132 and power generation circuit 211, and power control circuit 132 is incorporated into the data driver 130 of display module 100 inside.So, can reduce the circuit complexity of display module 100 external circuits, the installation cost of display module 100 is reduced.
In general, data driver 130 and its external circuit such as printed circuit board (PCB) 210 or flexible circuit board 220 are the power supply areas (power domain) that belong to different.So-called power supply area for example is to be used for the scope of definition circuit or the voltage that element used or can bear.In a real example of doing, data driver 130 for example is to press or the area of low pressure in belonging to: about 13 volts or below, and printed circuit board (PCB) 210 and flexible circuit board 220 for example are to belong to the high-pressure area: about 20 volts.Compared to the high-pressure area, the defined voltage in area of low pressure is lower, so the component pressure of the required use 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 the high-pressure area, its component pressure is high, and data driver 130 belong in pressure or area of low pressure, its component pressure relatively low.The old friend, power control circuit 132 belongs to different power supply areas with power generation circuit 211.In other words, compared to being arranged on the high-pressure area, the power control circuit 132 of pressure or area of low pressure can be realized with withstand voltage lower element in being arranged on, and has less range of distribution and lower cost.
Please with reference to Fig. 2, it illustrates the synoptic diagram of an example of power-supply controller of electric 132 and power generation circuit 211 and the coherent signal of Fig. 1.For the power control circuit 132 and power generation circuit 211 that belong to two different electrical power zone, the switching signal between therebetween need pass through suitable design.In an embodiment, for the power generation circuit 211 of controlling the 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.Scanning applied voltage VGH is scanner driver 120 employed positive voltages.Among the Yu Shizuo, scanning applied voltage VGH is defined in the high-pressure area, as 15 volts.This scanning applied voltage VGH is higher than the component pressure of the power control circuit 132 that is incorporated in the data driver 130.Be to receive a detection signal Vd1 who is lower than scanning applied voltage VGH, and provide a control signal Vc1 to carry out Control of Voltage according to this with, power control circuit 132.This detection signal Vd1 system detects the variation of scanning applied voltage VGH so as to making power control circuit 132, and is reflected on its control signal Vc1 along with scanning applied voltage VGH change.
In another embodiment, power control circuit 132 is used for the generation of gated sweep applied voltage VGL.Scanning applied voltage VGL is scanner driver 120 employed negative voltages.Among the Yu Shizuo, scanning applied voltage VGL for example is about-10 volts.Similar in the scanning applied voltage VGH of positive potential, power control circuit 132 can receive the detection signal Vd2 that amplitude is 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 more is used for the generation of control data applied voltage AVDD.Data applied voltage AVDD is data driver 130 employed voltages.Among the Yu Shizuo, data applied voltage AVDD for example is about 10 volts.Similar in scanning applied voltage VGH or VGL, power control circuit 132 also can receive a detection signal Vd3 who is lower than data applied voltage AVDD, and provides a control signal Vc3 to carry out Control of Voltage according to this.
In these a little embodiment, detecting voltage Vd1～Vd3 can have different embodiment according to the different circuits design.In an embodiment, detecting voltage Vd1 for example is the dividing potential drop of scanning applied voltage VGH.In other words, power generation circuit 211 for example is the mode with resistance string, the dividing potential drop of the power supply area of power generation circuit 211 is fed back to power control circuit 132, with the Control of Voltage benchmark as power control circuit 132.The implementation method that detects voltage Vd2 and Vd3 is also similar.
Please with reference to Fig. 3 A～3C, it respectively illustrates the synoptic diagram of an example of detailed circuit of the power generation circuit 211 of Fig. 1.In this example, power generation circuit 211 comprises three sub-circuit 211a～211c, respectively in order to the scanning applied voltage VGL of the scanning applied voltage VGH that produces positive potential, negative potential, and data applied voltage AVDD.
Shown in Fig. 3 A, electronic circuit 211a is illustrated by example with a charge pump (charge pump) circuit.Electronic circuit 211a comprises multiple circuit component such as capacitor Ca1～Ca2 and diode Da1～Da2.Electronic circuit 211a is via resistor R a1, the formed resistance string of Ra2, with the dividing potential drop of scanning applied voltage VGH as detecting voltage Vd1 and feeding back to power control circuit 132.By the resistor R a1 and the 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 is provided for example is a charge pump control signal.Power-supply controller of electric 132 for example is the current potential that comes gated sweep applied voltage VGH with the mode that changes signal potential or amplitude.In this example, tentation data applied voltage AVDD is 13V, and the activation current potential of control signal Vc1 for example is 13V, and so, scanning applied voltage VGH is two multiplication of voltages, like 26V.
Shown in Fig. 3 B, the embodiment of electronic circuit 211b is similar in electronic circuit 211a, and it comprises multiple circuit component such as capacitor Cb1～Cb3 and diode Db1～Db3.Under the bias voltage of supply voltage VCC, electronic circuit 211b is via resistor R b1, the formed resistance string of Rb2, with the dividing potential drop of scanning applied voltage VGL as detecting voltage Vd2.The activation current potential of supposing control signal Vc2 is 13V, and then its inversion signal Vc2-b then has anti-phase current potential such as 0V.Direction according to diode can know that scanning applied voltage VGL can have negative potential.Electronic circuit 211b to make flowing mode similar in electronic circuit 211a, so do not detail.
Shown in Fig. 3 C, electronic circuit 211c modulates with a pulse bandwidth that (pulse width modulation, PWM) circuit is illustrated by example.Electronic circuit 211c comprises multiple circuit component such as capacitor Cc1～Cc2, diode Dc1, inductor Lc1, transistor T c1, reaches resistor R c1, Rc2.Electronic circuit 211c produces via the feedback of resistor R c2 and detects voltage Vd3.In this example, it is a pwm control signal that 132 of power-supply controller of electric provide control signal Vc3, and its amplitude is the current potential of supply voltage VCC for example, like 3.3V.Power-supply controller of electric 132 for example is the current potential that comes control data applied voltage AVDD with the mode that changes the signal pulsewidth.
In the described example of Fig. 3; Can supply voltage VCC (like 3.3V) be promoted by pwm circuit and be higher data applied voltage AVDD (like 13V), relend by charge pump circuit with data applied voltage AVDD convert into higher scanning applied voltage VGH (like 20V) or the scanning applied voltage VGL of negative potential (as-10V).So, just, can control the generation of high voltage with withstand voltage lower circuit.Right the present invention also is not limited thereto.
According to described data driver of the above embodiments of the present invention and display module thereof, lie in data driver and integrated a power control circuit, can be used for controlling the generation of the required voltage of display module.So, can reduce the circuit complexity of display module external circuit, thereby improve the installation cost of display module.
Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.
Claims (15)
1. a data driver is applicable to a display module, and this data driver comprises:
One data line drive circuit is in order to drive many data lines of this display module; And
One power control circuit is in order to control the employed one scan applied voltage of one scan driver that the outside power generation circuit of this data driver produces this display module.
2. data driver as claimed in claim 1 is characterized in that, this power control circuit more produces the employed data applied voltage of this data driver in order to control this power generation circuit.
3. data driver as claimed in claim 1; It is characterized in that; This power control circuit is in order to receive a detection signal and a control signal is provided according to this; This detection signal is lower than this scanning applied voltage and along with the change of this scanning applied voltage, and this control signal is used to control the generation of this scanning applied voltage.
4. data driver as claimed in claim 3 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 is characterized in that, this control signal is a charge pump signal or a pulse bandwidth modulation signal.
6. data driver as claimed in claim 1 is characterized in that, this power control circuit belongs to different power supply areas with this power generation circuit.
7. data driver as claimed in claim 1 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 is in order to drive many data lines of this display module; And
One power control circuit; In order to receive a detection signal and a control signal be provided according to this; The voltage potential of this detection signal is lower than the employed one scan applied voltage of one scan driver of this display module and along with the change of this scanning applied voltage, and this control signal is used to control 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 another control signal is provided according to this; The voltage potential of this another detection signal is lower than the employed data applied voltage of this data driver and along with the change of this data applied voltage, and this another control signal is used to control the generation of this data applied voltage.
10. data driver as claimed in claim 8 is characterized in that, this detection signal is a dividing potential drop of this scanning applied voltage.
11. data driver as claimed in claim 8 is characterized in that, this control signal is a charge pump signal or a pulse bandwidth modulation signal.
12. data driver as claimed in claim 8 is characterized in that, this control signal provides to the outside power generation circuit of this data driver, and makes this power generation circuit produce this scanning applied voltage.
13. data driver as claimed in claim 12 is characterized in that, this power control circuit belongs to different power supply areas with this power generation circuit.
14. data driver 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. a display module comprises:
One display panel comprises:
The multi-strip scanning line;
Many data lines are handed over more with those sweep traces; And
A plurality of pixels, the friendship that is arranged at those sweep traces and those data lines is located more;
The one scan driver is in order to receive the one scan applied voltage and to drive those sweep traces; And
One data driver comprises:
One data line drive circuit is in order to drive those data lines; And
One power control circuit produces this scanning applied voltage in order to control the outside power generation circuit of this data driver.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102789754A true CN102789754A (en) | 2012-11-21 |
| CN102789754B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110738963A (en) * | 2018-07-20 | 2020-01-31 | 矽创电子股份有限公司 | Display driving circuit |
| CN112072913A (en) * | 2020-09-22 | 2020-12-11 | 禹创半导体(深圳)有限公司 | High-compatibility power supply framework for driving display IC |
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| 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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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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110738963A (en) * | 2018-07-20 | 2020-01-31 | 矽创电子股份有限公司 | Display driving circuit |
| CN110738963B (en) * | 2018-07-20 | 2021-10-01 | 矽创电子股份有限公司 | Display driving circuit |
| TWI761693B (en) * | 2018-07-20 | 2022-04-21 | 矽創電子股份有限公司 | Display driving circuit |
| CN112072913A (en) * | 2020-09-22 | 2020-12-11 | 禹创半导体(深圳)有限公司 | High-compatibility power supply framework for driving display IC |
| 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 |
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| CN102789754B (en) | 2015-04-15 |
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