CN1300761C - LCD panel drive circuit and LCD - Google Patents
LCD panel drive circuit and LCD Download PDFInfo
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- CN1300761C CN1300761C CNB2003101203043A CN200310120304A CN1300761C CN 1300761 C CN1300761 C CN 1300761C CN B2003101203043 A CNB2003101203043 A CN B2003101203043A CN 200310120304 A CN200310120304 A CN 200310120304A CN 1300761 C CN1300761 C CN 1300761C
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Abstract
The present invention relates to a driving circuit of a liquid crystal display panel, which is suitable for outputting a corresponding video signal so as to control a liquid crystal display panel according to a video control signal provided by a master machine. The liquid crystal display panel comprises a plurality of light emitting components and a plurality of display units; the light emitting components and the display units are respectively connected with a plurality of corresponding data electrodes and grid electrodes. A grid electrode driver is used for sending scanning signals to the grid electrode. A data driver is used for outputting video signals to the data electrodes according to the video control signal and outputting corresponding voltage control signals according to a brightness regulating signals. A driving power source generating device is used for outputting a corresponding driving power source to the light emitting components according to the voltage control signals.
Description
Technical field
The present invention relates to a kind of liquid crystal display panel drive circuit and LCD, particularly relate to a kind of liquid crystal display panel drive circuit and LCD that luminescence component drives function that have.
Background technology
Fig. 1 represents the schematic equivalent circuit of known display panels (liquid crystal displ aypanel is hereinafter to be referred as the LCD panel) and peripheral drive circuit thereof.As shown in the figure, on the LCD panel 1 be by crisscross data electrode (with D1, D2, D3 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit (display unit), and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 200.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11-Q1m, Q21-Q2m ..., Qn1-Qnm) and storage capacitors (C11-C1m, C21-C2m ..., Cn1-Cnm).The grid of thin film transistor (TFT) is connected gate electrode (G1-Gn) and data electrode (D1-Dm) respectively with drain electrode, by the sweep signal on the gate electrode (G1-Gn), can conducting close all thin film transistor (TFT)s on the same row (that is same sweep trace), whether the video signal of using on the control data electrode (D1-Dm) (video signal) can be written in the corresponding display unit.Mandatory declaration be that each display unit is the single bright spot on the corresponding LCD panel.That is for monochromatic LCD, each display unit is corresponding to single pixel (pixel); For color LCD, each display unit then is corresponding single pixel (subpixel), can be respectively red (representing with R), blue (representing with B) or green (representing with G), in other words, the inferior pixel of one group of RGB (three display units) can constitute single pixel.
In addition, in Fig. 1, express the driving circuit section of LCD panel 1 simultaneously.Gate drivers (gate driver) the 10th, according to set scanning sequency, send each gate electrode G1, G2 ..., the sweep signal on the Gn.When being loaded with sweep signal on a certain gate electrode, can make samely to list or be conducting state with the thin film transistor (TFT) in online all display units of one scan.When a certain sweep trace was selected, data driver 20 was according to image data to be shown, via data electrode D1, D2 ... Dm, send corresponding video signal to m display unit of these row.After gate drivers 10 is finished once the online scan operation of all n column scans, i.e. the display operation of single frame (frame) is finished in expression.Therefore, each sweep trace of multiple scanning and send video signal just can be realized the purpose of continuous show image.Wherein, signal CPV represents the clock signal of gate drivers 10, and signal CTR then represents the scan control message that gate drivers 10 is received; Signal LD represents data latching (latch) signal of data driver 20, and signal DATA then represents to import dicom message.
In addition, in order to improve the brightness of display, traditional LC D panel must install one group of luminescent system additional and reach the effect that helps demonstration so that suitable light amount to be provided.
United States Patent (USP) 5,778,256 have disclosed a kind of personal digital assistant (personal digitalassistant, PDA) device, comprise a CPU, storer, light emitting diode (Light EmittingDiode, LED), be arranged at led drive circuit, interface connector between CPU and the light emitting diode, be coupled to egress buffer circuit between interface connector and the CPU and the interface data buffer circuit that is coupled to interface connector and CPU by data line.Yet, quote the usefulness that the employed led drive circuit of data only is used as the LED driving as proof, therefore, PDA is except being provided with in order to the driving circuit that drives display panel, led drive circuit is installed in the formality that need expend additional space and assembling additional, has improved the production cost of display device.
Moreover, except that traditional PD A,, therefore also meet with identical problem because the led drive circuit of traditional intelligence type mobile phone (Smartphone) also is an independent operation with the driving circuit that is used for driving display panel.
Summary of the invention
In view of this, in order to address the above problem, fundamental purpose of the present invention provides a kind of liquid crystal display panel drive circuit and LCD, led drive circuit and panel drive circuit are combined, make to show that product does not need plug-in led drive circuit again, therefore reduced manufacturing cost and increased the utilization benefit.
For achieving the above object, the present invention proposes a kind of liquid crystal display panel drive circuit, be applicable to that the image control signal that provides according to main frame exports a corresponding video signal to control a display panels, display panels comprises a plurality of luminescence components and a plurality of display unit, connects corresponding a plurality of data electrodes and a plurality of gate electrode respectively.Gate drivers is in order to send sweep signal to gate electrode.Data driver is in order to exporting video signal to data electrode according to the image control signal, and exports corresponding voltage control signal according to brightness adjusting signal.The driving power generation device is in order to export corresponding driving power to above-mentioned luminescence component according to above-mentioned voltage control signal.
In addition, the present invention proposes a kind of liquid crystal display panel drive circuit, be applicable to that the image control signal that provides according to main frame exports corresponding video signal with the control display panels, display panels comprises a plurality of luminescence components and a plurality of display unit, connects corresponding a plurality of data electrodes and a plurality of gate electrode respectively.Gate drivers is in order to sending sweep signal to gate electrode, and exports corresponding voltage control signal according to brightness adjusting signal.Data driver is in order to export video signal to data electrode according to the image control signal.The driving power generation device is in order to export corresponding driving power to luminescence component according to voltage control signal.
In addition, the present invention proposes a kind of LCD, is applicable to the image control signal that provides according to main frame and show image.Display panels comprises a plurality of display units, connects corresponding a plurality of data electrodes and a plurality of gate electrode respectively.Panel driver is exported video signal to data electrode in order to send sweep signal to gate electrode according to the image control signal, and exports corresponding voltage control signal according to brightness adjusting signal.The driving power generation device is exported corresponding driving power according to voltage control signal.A plurality of luminescence components are coupled to the driving power generation device, in order to produce corresponding brightness according to the driving power that is received.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Fig. 1 represents the schematic equivalent circuit of known display panels and peripheral drive circuit thereof.
Fig. 2 shows the schematic equivalent circuit according to the described LCD of first embodiment of the invention.
Fig. 3 display brightness is adjusted the graph of a relation of signal ADJ and feedback signal FB.
The circuit diagram of Fig. 4 display driver power supply generator and led circuit.
Fig. 5 shows the schematic equivalent circuit according to the described LCD of second embodiment of the invention.
The reference numeral explanation
1,2～LCD panel
10,30,40～gate drivers
20,32,42～data driver
200～display unit
34～led driver
36～serial connection LED
38～driving power generation device
39～change-over switch
41A, 41B～label
ADJ～brightness adjusting signal
C～electric capacity
C11-C1m, C21-C2m～Cn1-Cnm～storage capacitors
CPV, CTR, LD, DATA～signal
D1, D2, D3～Dm～data electrode
D_out～voltage control signal
D～diode
FB～feedback signal
G1, G2 ,～Gn～gate electrode
L～inductance
Q11-Q1m, Q21-Q2m～Qn1-Qnm～thin film transistor (TFT)
Vcc～power supply
Embodiment
First embodiment:
Fig. 2 shows the schematic equivalent circuit according to the described LCD of first embodiment of the invention.As shown in the figure, on the LCD panel 2 be by crisscross data electrode (with D1, D2, D3 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit (display unit), and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 200.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11-Q1m, Q21-Q2m ..., Qn1-Qnm) and storage capacitors (C11-C1m, C21-C2m ..., Cn1-Cnm).The grid of thin film transistor (TFT) is connected gate electrode (G1-Gn) and data electrode (D1-Dm) respectively with drain electrode, by the sweep signal on the gate electrode (G1-Gn), can conducting close all thin film transistor (TFT)s on the same row (that is same sweep trace), whether the video signal of using on the control data electrode (D1-Dm) (video signal) can be written in the corresponding display unit.Mandatory declaration be the single bright spot on the corresponding LCD panel of each display unit.That is for monochromatic LCD, each display unit is corresponding to single pixel (pixel); For color LCD, each display unit then is corresponding single pixel (subpixel), can be respectively red (representing with R), blue (representing with B) or green (representing with G), in other words, the inferior pixel of one group of RGB (three display units) can constitute single pixel.
In addition, in Fig. 2, express driving circuit section simultaneously.Gate drivers (gatedriver) the 30th, according to set scanning sequency, send each gate electrode G1, G2 ..., the sweep signal on the Gn (or claiming scanning impulse).When being loaded with sweep signal on a certain gate electrode, can make samely to list or be conducting state with the thin film transistor (TFT) in online all display units of one scan.When a certain sweep trace was selected, data driver 32 was according to image data to be shown, via data electrode D1, D2 ... Dm, send corresponding video signal (GTG value) to m display unit of these row.In addition, gate drivers 30 inside also comprise a led driver 34, and its signal FB that is feedback according to a brightness adjusting signal ADJ and led circuit 36 exports corresponding voltage control signal D_out.
Fig. 3 display brightness is adjusted the graph of a relation of signal ADJ and feedback signal FB, as shown in the figure, when continuing to increase, brightness adjusting signal ADJ arrives maximal value ADJ (max) before, the magnitude of voltage of the signal FB that serial connection led circuit 36 is feedback also can proportionally increase, therefore, can control the light and shade of led light source.When brightness adjusting signal ADJ reaches maximal value ADJ (max); this moment, the value of feedback signal FB also reached maximal value FB (max), afterwards, if brightness adjusting signal ADJ continues to improve level; the value of feedback signal FB still remains on maximal value FB (max), and this is the protection mechanism of circuit.Brightness adjusting signal ADJ reaches the pairing LED brightness of maximal value ADJ (max) and is the specified high-high brightness of display.
The voltage control signal that driving power generation device 38 is exported according to led driver 34 is exported corresponding driving power to led circuit 36.At this voltage control signal D_out is square-wave signal.The circuit diagram of Fig. 4 display driver power supply generator and led circuit.As shown in the figure, change-over switch 39 has control gate, in the present embodiment, with the nmos pass transistor is example, control gate is its grid, and inductance L is coupled between the drain electrode and a power Vcc of nmos pass transistor, and the anode tap of diode D is coupled to the tie point of inductance L and nmos pass transistor, in addition, capacitor C is coupled between the cathode terminal and earth point of diode D, and the tie point of capacitor C and diode D is a power output end Vo, has the direct supply of set level in order to output.The direct supply that power output end Vo is exported provides to led circuit 36.Led circuit 36 is made of a plurality of series connection and light emitting diode (LED) in parallel.In the present invention, led circuit 36 can be made of the modes such as light emitting diode of a plurality of parallel connections of light-emitting diodes pipe jointing of the light emitting diode of the light emitting diode of a plurality of series connection, a plurality of parallel connections and a plurality of series connection.
The circuit operation of driving power generation device 38 is as follows, and when change-over switch 39 conductings, electric current directly flow to earth point by inductance L via nmos pass transistor, therefore produces electromotive force in inductance L, and polarity is shown in label 40A.This moment, capacitor C was leaked electricity gradually, caused output-voltage levels to reduce gradually.When change-over switch 39 is closed, the electromotive force of inductance L counter-rotating, polarity is shown in label 40B, so electric current charges to electric capacity via inductance L, diode D, so output-voltage levels raises gradually.Adjust the high level period of voltage control signal D_out and the ratio of low-level period by led driver 34, can effectively adjust the driving power of driving power generation device 38.For example, when increasing the ratio of low-level period, can improve the level of driving power, otherwise, if when increasing the ratio of high level period, then can reduce the level of driving power.
Moreover the driving power of driving power generation device 38 provides to led circuit 36, can make LED send corresponding brightness, and the voltage level FB of the tie point of led circuit 36 and impedance means Z feedbacks to led driver 34.As mentioned above, if the magnitude of voltage of feedback signal FB is low excessively, when promptly not meeting concerning as shown in Figure 3, then the voltage control signal D_out that exported of led driver 34 will increase the ratio of low-level period, and the signal FB that makes the higher level of device for generating voltage 38 outputs make led circuit 36 be feedback reaches predetermined level.Otherwise, if the magnitude of voltage of feedback signal FB is too high, then the voltage control signal D_out that exported of led driver 34 will increase the ratio of high level period, and the signal FB that makes the lower level of device for generating voltage 38 outputs make led circuit 36 be feedback reaches predetermined level.
Second embodiment:
Fig. 5 shows the schematic equivalent circuit according to the described LCD of second embodiment of the invention.As shown in the figure, on the LCD panel 2 be by crisscross data electrode (with D1, D2, D3 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit (display unit), and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 200.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11-Q1m, Q21-Q2m ..., Qn1-Qnm) and storage capacitors (C11-C1m, C21-C2m ..., Cn1-Cnm).The grid of thin film transistor (TFT) is connected gate electrode (G1-Gn) and data electrode (D1-Dm) respectively with drain electrode, by the sweep signal on the gate electrode (G1-Gn), can conducting close all thin film transistor (TFT)s on the same row (that is same sweep trace), whether the video signal of using on the control data electrode (D1-Dm) (video signal) can be written in the corresponding display unit.
In addition, in Fig. 5, express driving circuit section simultaneously.Gate drivers (gatedriver) the 40th according to set scanning sequency, is sent the sweep signal (or claiming scanning impulse) on each gate electrode G1, G2 .., the Gn.When being loaded with sweep signal on a certain gate electrode, can make samely to list or be conducting state with the thin film transistor (TFT) in online all display units of one scan.When a certain sweep trace was selected, data driver 42 was according to image data to be shown, via data electrode D1, D2 ... Dm, send corresponding video signal (GTG value) to m display unit of these row.In addition, data driver 42 inside also comprise a led driver 44, and its signal FB that is feedback according to a brightness adjusting signal ADJ and led circuit 36 exports corresponding voltage control signal D_out.
Consult Fig. 3, arrive maximal value ADJ (max) before when brightness adjusting signal ADJ continues to increase, the magnitude of voltage of the signal FB that led circuit 36 is feedback also can proportionally increase, and therefore, can control the light and shade of led light source.When brightness adjusting signal ADJ reaches maximal value ADJ (max); this moment, the value of feedback signal FB also reached maximal value FB (max), afterwards, if brightness adjusting signal ADJ continues to improve level; the value of feedback signal FB still remains on maximal value FB (max), and this is the protection mechanism of circuit.Brightness adjusting signal ADJ reaches the pairing LED brightness of maximal value ADJ (max) and is the specified high-high brightness of display.
At this, brightness adjusting signal ADJ can be coupled to the variable resistor of set magnitude of voltage by adjustment, or the application circuit of may command ADJ level, makes ADJ reach the purpose of the different voltage levels of output.In addition, if the magnitude of voltage of the signal FB that serial connection led circuit 36 is feedback is low excessively, when promptly not meeting concerning as shown in Figure 3, then the voltage control signal D_out that exported of led driver 34 will indicate the higher level of driving power generation device 38 outputs, and the signal FB that makes led circuit 36 be feedback reaches predetermined level.
Driving power generation device 38 is to export corresponding driving power to led circuit 36 according to the voltage control signal that led driver 44 is exported.At this voltage control signal D_out is square-wave signal.As shown in Figure 4, change-over switch 39 has control gate, in the present embodiment, with the nmos pass transistor is example, control gate is its grid, and inductance L is coupled between the drain electrode and a power Vcc of nmos pass transistor, and the anode tap of diode D is coupled to the tie point of inductance L and nmos pass transistor, in addition, capacitor C is coupled between the cathode terminal and earth point of diode D, and the tie point of capacitor C and diode D is a power output end Vo, has the direct supply of set level in order to output.
The direct supply that power output end Vo is exported provides to led circuit 36.Led circuit 36 is made of a plurality of series connection and light emitting diode (LED) in parallel.In the present invention, led circuit 36 can be made of the modes such as light emitting diode of a plurality of parallel connections of light-emitting diodes pipe jointing of the light emitting diode of the light emitting diode of a plurality of series connection, a plurality of parallel connections and a plurality of series connection.
The circuit operation of driving power generation device 38 is as follows, and when change-over switch 39 conductings, electric current directly flow to earth point by inductance L via nmos pass transistor, therefore produces electromotive force in inductance L, and polarity is shown in label 40A.This moment, capacitor C was leaked electricity gradually, caused output-voltage levels to reduce gradually.When change-over switch 39 is closed, the electromotive force of inductance L counter-rotating, polarity is shown in label 40B, so electric current charges to electric capacity via inductance L, diode D, so output level raises gradually.Adjust the high level period of voltage control signal D_out and the ratio of low-level period by led driver 44, can effectively adjust the driving power of driving power generation device 38.For example, when increasing the ratio of low-level period, can improve the level of output voltage, otherwise, if when increasing the ratio of high level period, then can reduce the level of output voltage.
Moreover the driving power of driving power generation device 38 provides to led circuit 36, can make LED send corresponding brightness, and the voltage level FB of the tie point of led circuit 36 and impedance means Z feedbacks to led driver 34.As mentioned above, if the magnitude of voltage of feedback signal FB is low excessively, when promptly not meeting concerning as shown in Figure 3, then the voltage control signal D_out that exported of led driver 44 will increase the ratio of low-level period, and the signal FB that makes the higher level of device for generating voltage 38 outputs make led circuit 36 be feedback reaches predetermined level.Otherwise, if the magnitude of voltage of feedback signal FB is too high, then the voltage control signal D_out that exported of led driver 34 will increase the ratio of high level period, and the signal FB that makes the lower level of device for generating voltage 38 outputs make serial connection led circuit 36 be feedback reaches predetermined level.
According to first embodiment of the invention and the described LCD of second embodiment, led driver can be integrated among the data driver or gate drivers of LCD, make that the application of light emitting diode is more convenient, and meet economic benefit, effectively solve the problem that exists in the conventional art.In addition, the LCD disclosed according to the embodiment of the invention mainly can be applied on the undersized panel, PDA for example, call screen, intelligent mobile phone (smartphone) or the like, but be not limited thereto application, can be applicable to the display panels of various sizes according to the disclosed LCD of the embodiment of the invention.
Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is looked accompanying Claim and is as the criterion.
Claims (24)
1. liquid crystal display drive circuit, be applicable to that an image control signal that is provided according to a main frame exports a corresponding video signal to control a LCD, above-mentioned LCD comprises a plurality of luminescence components and a plurality of display unit, connect corresponding a plurality of data electrodes and a plurality of gate electrode respectively, above-mentioned LCD driving mechanism comprises a gate drivers, in order to send sweep signal, it is characterized in that above-mentioned LCD driving mechanism also comprises to above-mentioned gate electrode:
One data driver in order to exporting above-mentioned video signal according to above-mentioned image control signal to above-mentioned data electrode, and is exported corresponding voltage control signal according to a brightness adjusting signal; And
One driving power generation device is in order to export corresponding driving voltage to above-mentioned luminescence component according to above-mentioned voltage control signal.
2. liquid crystal display drive circuit as claimed in claim 1, wherein above-mentioned voltage control signal is a square-wave signal.
3. liquid crystal display drive circuit as claimed in claim 1, wherein above-mentioned data driver is adjusted the high level period of above-mentioned voltage control signal and the ratio of low-level period according to above-mentioned brightness adjusting signal.
4. liquid crystal display drive circuit as claimed in claim 3, wherein above-mentioned driving power generation device comprises:
One switches switch, has a control gate, and in order to receiving above-mentioned voltage control signal, above-mentioned change-over switch is according to the level of above-mentioned voltage control signal and conducting or close;
One inductance device is coupled between a power supply and the above-mentioned change-over switch; And
One diode is coupled between above-mentioned change-over switch and the inductance device;
One electric capacity is coupled to above-mentioned diode, and the tie point of above-mentioned electric capacity and diode is exported above-mentioned driving voltage.
5. liquid crystal display drive circuit as claimed in claim 4, wherein the value of above-mentioned driving voltage is decided according to the high level period of above-mentioned voltage control signal and the ratio of low-level period.
6. liquid crystal display drive circuit as claimed in claim 1, wherein above-mentioned luminescence component is made of the light emitting diode mode of a plurality of parallel connections of light-emitting diodes pipe jointing of the light emitting diode of the light emitting diode of a plurality of series connection, a plurality of parallel connections or a plurality of series connection, has first end points that is coupled to above-mentioned driving power generation device and second end points that is coupled to above-mentioned data driver.
7. liquid crystal display drive circuit as claimed in claim 6, wherein above-mentioned data driver is adjusted the high level period of above-mentioned voltage control signal and the ratio of low-level period according to the voltage level of above-mentioned second end points.
8. liquid crystal display drive circuit as claimed in claim 1 also comprises an impedance, is arranged between second end points and an earth point of above-mentioned data driver.
9. liquid crystal display drive circuit, be applicable to that an image control signal that is provided according to a main frame exports a corresponding video signal to control a LCD, above-mentioned LCD comprises a plurality of luminescence components and a plurality of display unit, connect corresponding a plurality of data electrodes and a plurality of gate electrode respectively, above-mentioned LCD driving mechanism comprises a data driver, in order to export above-mentioned video signal according to above-mentioned image control signal, it is characterized in that above-mentioned LCD driving mechanism also comprises to above-mentioned data electrode:
One gate drivers in order to sending sweep signal to above-mentioned gate electrode, and is exported corresponding voltage control signal according to a brightness adjusting signal; And
One driving power generation device is in order to export corresponding driving voltage to above-mentioned luminescence component according to above-mentioned voltage control signal.
10. liquid crystal display drive circuit as claimed in claim 9, wherein above-mentioned voltage control signal is a square-wave signal.
11. liquid crystal display drive circuit as claimed in claim 9, wherein above-mentioned gate drivers is adjusted the high level period of above-mentioned voltage control signal and the ratio of low-level period according to above-mentioned brightness adjusting signal.
12. liquid crystal display drive circuit as claimed in claim 11, wherein above-mentioned driving power generation device comprises:
One switches switch, has a control gate, and in order to receiving above-mentioned voltage control signal, above-mentioned change-over switch is according to the level of above-mentioned voltage control signal and conducting or close;
One inductance device is coupled between a power supply and the above-mentioned change-over switch; And
One diode is coupled between above-mentioned change-over switch and the inductance device;
One electric capacity is coupled to above-mentioned diode, and the tie point of above-mentioned electric capacity and diode is exported above-mentioned driving voltage.
13. liquid crystal display drive circuit as claimed in claim 12, wherein the value of above-mentioned driving voltage is decided according to the high level period of above-mentioned voltage control signal and the ratio of low-level period.
14. liquid crystal display drive circuit as claimed in claim 9, wherein above-mentioned luminescence component is made of the light emitting diode mode of a plurality of parallel connections of light-emitting diodes pipe jointing of the light emitting diode of the light emitting diode of a plurality of series connection, a plurality of parallel connections or a plurality of series connection, has first end points that is coupled to above-mentioned driving power generation device and second end points that is coupled to above-mentioned data driver.
15. liquid crystal display drive circuit as claimed in claim 9, wherein above-mentioned gate drivers is adjusted the high level period of above-mentioned voltage control signal and the ratio of low-level period according to the voltage level of second end points of above-mentioned data driver.
16. liquid crystal display drive circuit as claimed in claim 9 also comprises an impedance, is arranged between second end points and an earth point of above-mentioned data driver.
17. LCD, be applicable to the image control signal that provides according to a main frame and show image, this LCD comprises a display panels, comprise a plurality of display units, connect corresponding a plurality of data electrodes and a plurality of gate electrode respectively, it is characterized in that this LCD also comprises:
One panel driver in order to send sweep signal to above-mentioned gate electrode, is exported above-mentioned video signal to above-mentioned data electrode according to above-mentioned image control signal, and is exported corresponding voltage control signal according to a brightness adjusting signal;
One driving power generation device is in order to export corresponding driving voltage according to above-mentioned voltage control signal; And
A plurality of luminescence components of serial connection are coupled to above-mentioned driving power generation device, in order to produce corresponding brightness according to the driving voltage that is received.
18. LCD as claimed in claim 17, wherein above-mentioned voltage control signal is a square-wave signal.
19. LCD as claimed in claim 17, wherein above-mentioned gate drivers are to adjust the ratio of the high level period of above-mentioned voltage control signal and low-level period according to above-mentioned brightness adjusting signal.
20. LCD as claimed in claim 19, wherein above-mentioned driving power generation device comprises:
One switches switch, has a control gate, and in order to receiving above-mentioned voltage control signal, above-mentioned change-over switch is according to the level of above-mentioned voltage control signal and conducting or close;
One inductance device is coupled between a power supply and the above-mentioned change-over switch;
One diode is coupled between above-mentioned change-over switch and the inductance device; And
One electric capacity is coupled to above-mentioned diode, and the tie point of above-mentioned electric capacity and diode is exported above-mentioned driving voltage.
21. LCD as claimed in claim 20, wherein the value of above-mentioned driving voltage is decided according to the high level period of above-mentioned voltage control signal and the ratio of low-level period.
22. LCD as claimed in claim 17, wherein above-mentioned luminescence component is made of the light emitting diode mode of a plurality of parallel connections of light-emitting diodes pipe jointing of the light emitting diode of the light emitting diode of a plurality of series connection, a plurality of parallel connections or a plurality of series connection, has first end points that is coupled to above-mentioned driving power generation device and second end points that is coupled to above-mentioned data driver.
23. LCD as claimed in claim 22, wherein above-mentioned gate drivers is adjusted the high level period of above-mentioned voltage control signal and the ratio of low-level period according to the voltage level of above-mentioned second end points.
24. LCD as claimed in claim 23 also comprises an impedance, is arranged between above-mentioned second end points and the earth point.
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| CNB2003101203043A CN1300761C (en) | 2003-12-05 | 2003-12-05 | LCD panel drive circuit and LCD |
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| TWI319553B (en) | 2005-05-13 | 2010-01-11 | Au Optronics Corp | Organic electro-luminescence display |
| CN100377387C (en) * | 2005-05-31 | 2008-03-26 | 友达光电股份有限公司 | Electronic device with organic electroluminescence display |
| CN101686043B (en) * | 2008-09-28 | 2012-12-05 | 四川虹欧显示器件有限公司 | Circuit structure for protecting driving tube |
| CN103838344B (en) * | 2012-11-27 | 2016-08-03 | 英业达科技有限公司 | The system and method for mainboard power supply supply control are carried out by boundary scan |
| CN109493811A (en) * | 2018-12-25 | 2019-03-19 | 厦门天马微电子有限公司 | A kind of display device and its driving method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001117535A (en) * | 1999-10-22 | 2001-04-27 | Auto Network Gijutsu Kenkyusho:Kk | Display element driving device |
| JP2002149080A (en) * | 2000-11-08 | 2002-05-22 | Nec Corp | Plasma display module provided with power source |
| JP2003332624A (en) * | 2002-05-07 | 2003-11-21 | Rohm Co Ltd | Light emitting element drive device and electronic apparatus having light emitting element |
-
2003
- 2003-12-05 CN CNB2003101203043A patent/CN1300761C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001117535A (en) * | 1999-10-22 | 2001-04-27 | Auto Network Gijutsu Kenkyusho:Kk | Display element driving device |
| JP2002149080A (en) * | 2000-11-08 | 2002-05-22 | Nec Corp | Plasma display module provided with power source |
| JP2003332624A (en) * | 2002-05-07 | 2003-11-21 | Rohm Co Ltd | Light emitting element drive device and electronic apparatus having light emitting element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1547184A (en) | 2004-11-17 |
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