CN101540147A - Liquid crystal display driving device with independent voltage conversion unit - Google Patents
Liquid crystal display driving device with independent voltage conversion unit Download PDFInfo
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- CN101540147A CN101540147A CN200810085124A CN200810085124A CN101540147A CN 101540147 A CN101540147 A CN 101540147A CN 200810085124 A CN200810085124 A CN 200810085124A CN 200810085124 A CN200810085124 A CN 200810085124A CN 101540147 A CN101540147 A CN 101540147A
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- voltage conversion
- source electrode
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Abstract
The invention relates a liquid crystal display driving device with an independent voltage conversion unit, which comprises a gate drive circuit, the voltage conversion unit connected to the gate drive circuit, a plurality of source drive circuits and metal signal wires which are connected between the source drive circuits and formed on a glass panel; and each source drive unit comprises a buffered image signal receiving unit which comprises a buffer for receiving image signals, a bus switching input part electrically connected to the buffer and an encoder electrically connected to the bus switching input part. The voltage conversion unit can be controlled by a divider resistor to provide voltage signals at different levels and the voltage signals are supplied to the source drive circuits by the metal power wires arranged on the glass panel. The device can provide large and flexible voltage levels, the image signals are processed and transmitted by the serially connected source drive circuits, and the liquid crystal displayer can realize the drive of panels of different sizes through a flexible circuit board with a fixed width.
Description
Technical field
The present invention relates to a kind of panel of LCD drive unit, refer to a kind of LCD driving mechanism especially with independent voltage conversion unit.
Background technology
Thin Film Transistor-LCD (TFT-LCD) mainly is responsible for the liquid crystal light valve that switch is lined up the array shape by thin film transistor (TFT), cooperates chromatic filter layer that filter effect is provided again, to reach the full-color demonstration of image.The drive system of Thin Film Transistor-LCD mainly comprises gate pole driver (GateDriver) chip, source electrode driver (Source Driver) chip, reaches time schedule controller (TCON or T-CON, Timing Controller) chip is to be sent to electric power signal, control signal and image data signal the thin film transistor switch on the face glass.Moreover, the drive system of LCD also may need to arrange in pairs or groups operational amplifier (OPAMP, Operational Amplifier) or impact damper (Buffer).Source electrode driver is also referred to as data driver (Data Driver) sometimes, and gate pole driver then is called scanner driver (Scan Driver).
For the facilitating chip encapsulation, time schedule controller (TCON) is together integrated, is encapsulated with source electrode driver sometimes; Gate pole driver is then integrated circuit such as DC voltage, opens control voltage V as gate
GH, gate closing control voltage V
GL, LCD shares driving voltage V
COMAnd digital power (VDD).
Figure 1 shows that the TFT-LCD drive system of known technology, this TFT-LCD drive system mainly comprises gate pole driver 10, most source electrode drivers 12, flexible circuit boards 2 and is positioned at most bars connecting lines 14 and electric power connecting line 14a and electric power connecting line 10a on the flexible circuit board 2.
These gate pole driver 10 putting positions need be decided on the resolution of product, and because of present TFT-LCD towards the high resolving power picture element, so gate pole driver 10 mostly the circuit when being subjected to panel designs limit, and be placed in the minor face of TFT-LCD.The external synchronizing signal of each source electrode driver 12, signal of video signal, DC voltage etc. all need outer moving on client's the system board (not going out among the figure); For example with circuits such as sequential (TIMING) signal, signal of video signal, DC voltage on each relative position through glass (GLASS) panel to flexible circuit board (FPC) 2, be connected with the client of rear end by signal connecting line 14 again, therefore produce large-area line design as shown in Figure 1.Most bars connecting lines 14 on the flexible circuit board 2 all are segmentations and define identical signal and DC voltage, therefore can waste considerable flexible circuit board material.
With three primary colors (RGB, Red, Green, Blue) image interface, if the resolution of TFT-LCD is each 8 of RGB, then signal of video signal just has 24 lines, add that synchronizing signal and frequency signal have 4 lines, DC voltage also has above-mentioned mentioned gate to open control voltage, gate closing control voltage, LCD to share 5 lines such as driving voltage and digital power, so 33 lines side by side altogether can expend sizable area like this.This flexible circuit board 2 must connect client a bit of of rear ends, makes flexible circuit board 2 be the T font, and causes the quantity of flexible circuit board factory on the row's of production plate to reduce, and makes cost can't descend always.
Moreover the electric power of TFT-LCD drive system as shown in Figure 1 offers most source electrode drivers 12 by gate pole driver 10 via electric power connecting line 10a, therefore power is limited, can't satisfy the demand of large scale TFT-LCD, moreover voltage level (level) can't be adjusted also.
Summary of the invention
In view of this, the object of the present invention is to provide the LCD driving mechanism that a kind of adjustable-voltage position is accurate and can reduce cost with independent voltage conversion unit.
To achieve the above object, the invention provides a kind of LCD driving mechanism with independent voltage conversion unit, its electric power signal that receives the electric power supply circuit reaches the signal of video signal from system end, and the driving liquid crystal panel, this LCD driving mechanism with independent voltage conversion unit comprises:
Gate drive circuit, it is positioned on the face glass;
A most source electrode drive circuit, it is positioned on this face glass;
Metallic signal lines, it is positioned on this face glass and receives this signal of video signal, this metallic signal lines comprises most metal wire sections, and metal wire sections is electrically connected between these source electrode drive circuits, and this metallic signal lines is transmitted this signal of video signal between these source electrode drive circuits; And
Voltage conversion unit, it is positioned on this face glass and receives this electric power signal, and this voltage conversion unit provides the not voltage signal of coordination standard, and via the metallic power line voltage signal is provided to this gate drive circuit and these source electrode drive circuits;
This each source electrode drive circuit comprises buffer-type signal of video signal receiving element, and this buffer-type signal of video signal receiving element further comprises:
Impact damper, it receives this signal of video signal of this system end or the signal of video signal of previous stage source electrode drive circuit;
Bus is switched the importation, and it is electrically connected to this impact damper and controlled by input select signal, selectivity receiving crystal pipe-transistor logic interface input signal or differential interface input signal;
Scrambler, it is electrically connected to this bus and switches importation and controlled by this input select signal, optionally with transistor-transistor logic interface input signal or the differential interface input signal is re-encoded as differential interface signal or transistor-transistor logic interface signal.
Therefore, the present invention can reach following beneficial effect:
Because voltage conversion unit is independent the setting, therefore can provide bigger and more resilient voltage level.Moreover signal of video signal handled and transmitted by the source electrode drive circuit of serial connection, and LCD can be by the flexible circuit board of fixed width, and realizes the panel driving of different size.
Description of drawings
Fig. 1 is the TFT-LCD driving framework synoptic diagram of known technology;
Fig. 2 is a LCD driving mechanism configuration diagram of the present invention;
Fig. 3 is a buffer-type signal of video signal receiving element synoptic diagram of the present invention;
Fig. 4 is the synoptic diagram that voltage conversion unit is realized by integrated circuit;
Fig. 5 is the circuit diagram of voltage conversion unit part.
Description of reference numerals
Electric power connecting line 14a electric power connecting line 10a
Electric power supply circuit 321
Divider resistance 3004
Source electrode drive circuit 302A
Source electrode drive circuit 302B
Buffer-type signal of video signal receiving element 322
Synchro control part 3226
Transceiver unit 324
Series connection control signal 304
The first metal wire sections 40a, the second metal wire sections 40b
Embodiment
Please refer to Fig. 2, Fig. 2 is the LCD driving mechanism configuration diagram with independent voltage conversion unit of the present invention, and this LCD driving mechanism is applied in the display, and this display comprises face glass 30 and flexible circuit board 32 at least.
This LCD driving mechanism mainly comprises electric power supply circuit 321, gate drive circuit 300 and most (302A and 302B only are shown among the figure) such as source electrode drive circuit 302A, 302B, wherein this electric power supply circuit 321 is positioned on this flexible circuit board 32, and this gate drive circuit 300 and these source electrode drive circuits 302A, 302B then are positioned on this face glass 30.
This gate drive circuit 300 is electrically connected to the voltage conversion unit 3000 that is positioned on the face glass 30, and this voltage conversion unit 3000 is electrically connected to the passive component unit 3002 that is positioned at flexible circuit board 32.This voltage conversion unit 3000 can be realized by switching power integrated circuit (switching power IC), so that LCD driving mechanism required voltage (being detailed later) to be provided.The electric power that this voltage conversion unit 3000 is accepted to be sent by this electric power supply circuit 321 provides running power, and many group operating voltage are provided, and comprises gate unlatching control voltage V
GH, gate closing control voltage V
GL, LCD shares driving voltage V
COMEtc. operating voltage, and be supplied to each source electrode drive circuit 302A, 302B etc. via the metallic power line 42 on this face glass 30, and this gate drive circuit 300.
Each source electrode drive circuit comprises timing control unit 320 that this source electrode drive circuit frequency signal is provided, buffer-type signal of video signal receiving element 322, and transceiver unit (transceiver) 324.Wherein, the signal of video signal of being brought in by system is sent to most proximal end source electrode drive circuit 302A via the metallic signal lines 40 on this face glass 30, and this most proximal end source electrode drive circuit 302A is the source electrode drive circuit nearest apart from the load point 400 of metallic signal lines 40.This metallic signal lines 40 is by metal wire glass bond technology (WOG, wire on glass) makes, and comprise the first metal wire sections 40a that connects load point 400 and this most proximal end source electrode drive circuit 302A, most the metal wire sections such as the second metal wire sections 40b that connect this most proximal end source electrode drive circuit 302A and time one-level source electrode drive circuit 302B; Realize that by the metallic signal lines 40 that on this face glass 30, is provided image input signal is connected with the signal of each source electrode drive circuit.
Referring to Fig. 3, this buffer-type signal of video signal receiving element 322 mainly comprises impact damper (buffer) 3220, bus with terminal impedance and switches importation (bus switching receiver) 3221, power adjustments part (power regulator) 3222, scrambler 3224, synchro control part (synchronization controller) 3226.This impact damper 3220 is from system end or the previous stage source electrode drive circuit receives signal of video signal and terminal impedance is provided, to increase stiffness of system.This bus is switched importation 3221 and is electrically connected to this impact damper 3220, and is subjected to input select signal Sel control and selection differential interface image input signal V
InOr transistor-transistor logic (TTL, Transistor-Transistor Logic) interface image input signal V
InWherein this differential interface signal can be Low Voltage Differential Signal (LVDS), low-swing differential signal (RSDS), high resolution multimedia interface (HDMI, High-Definition Multimedia Interface) signal, or HSSI High-Speed Serial Interface (SERIAL RGB I/F) signal, be the example explanation hereinafter with the LVDS signal.Power adjustments part 3222 is electrically connected to this bus and switches importation 3221, to switch suitable operating power.This scrambler 3224 is electrically connected to this bus and switches importation 3221, and is subjected to this input select signal Sel control and optionally with image input signal V
InRecompile.For example when not needing recompile, this scrambler 3224 is directly exported (bypass) this image input signal V
InWhen the needs recompile, this scrambler 3224 is with TTL interface image input signal V
InBe re-encoded as LVDS interface signal of video signal, or with LVDS interface image input signal V
InBe re-encoded as TTL interface signal of video signal.Because recompile needs the time, scrambler 3224 output signal V
OutWith input signal V
InHave the time difference, so this synchro control part 3226 is electrically connected to this scrambler 3224, synchronous to make sequential.
Referring to Fig. 2, the buffer-type signal of video signal receiving element 322 of this most proximal end source electrode drive circuit 302A receives image input signal from system end again, after treatment promptly by transceiver unit 324 outputs.The signal of video signal of output is handled via the buffer-type signal of video signal receiving element 322 that the second metal wire sections 40b delivers to time one-level source electrode drive circuit 302B.Owing to signal of video signal is handled and transmitted by the source electrode drive circuit of serial connection, therefore do not need the width that how much changes flexible circuit board 32 according to source electrode drive circuit.According to drive unit of the present invention, can be by the flexible circuit board 32 of fixed width, and realize that the face glass 30 of different size drives.
Referring to Fig. 4, be the synoptic diagram that voltage conversion unit 3000 is realized by integrated circuit, the outer passive component part (resistance, electric capacity, inductance) of wherein big dotted line can be provided by passive component unit 3002.The power supply supply that the bigger needs of the size of notebook computer and monitor product are bigger, therefore if voltage conversion unit 3000 is independent, and with glass-encapsulated (COG, Chip On Glass) form is incorporated into it on face glass 30 by the industrial standard processing procedure that anisotropic conductive (ACF) engages, and can provide more high-power.If it is bigger that the large scale product starts immediate current, then buffer-type signal of video signal receiving element 322 can utilize power order (POWER SEQUENCE) control signal to control this voltage conversion unit 3000.Moreover the input of this voltage conversion unit 3000 can be controlled by the electric resistance partial pressure mode, and to determine different output voltages, promptly gate is opened control voltage V
GH, gate closing control voltage V
GL, LCD shares driving voltage V
COM, gamma (GAMMA) voltage V
GAMMACan satisfy its required numerical value.This divider resistance 3004, its viewable design demand and change different numerical value.When this voltage conversion unit 3000 is realized by integrated circuit, the operational amplifier more than five groups for example can be arranged in inside, these amplifiers are functions of forming voltage follower, and set output voltage by the electric resistance partial pressure control input end.Wherein four groups of operational amplifiers of this voltage conversion unit 3000 are distinguished one group in twos, in order to the positive polarity of individual settings GAMMA voltage and the highest, the minimum voltage of negative polarity; Another group operational amplifier is then shared as LCD and is driven DC voltage (DC V
COM) output voltage.Owing to set output voltage by the electric resistance partial pressure control input end, therefore can integrate direct supply (DC POWER), the shared driving voltage V of LCD
COM, function such as gamma (GAMMA) voltage, make easier and development time of product design to shorten, also reach the design that multimachine kind, many sizes are shared simultaneously.
Moreover referring to Fig. 5, the input voltage signal of the part input port of voltage conversion unit 3000 (being at least one among IN1～IN3) also can directly pass through Serial Peripheral Interface (SPI) (SPI) or internal integrated circuit (I except utilizing divider resistance control
2C) industrial digital interface and direct supplied with digital signal such as.Under this situation, these voltage conversion unit 3000 inside can be by digital analog converter (DAC) with will be by SPI or I
2The digital signal of C interface input converts simulating signal to determine different output voltages.
When actual fabrication of the present invention, the series connection control signal 304 that originally had between gate drive circuit 300 and source electrode drive circuit still is retained, and series connection control signal such as perpendicular line begin sweep signal (STV), horizontal line begins sweep signal (STH), gate circuit output enable signal (OEV), source line output enable signal (OEH), image reverse control signal (UD) and image left and right sides reverse control signal (RL) up and down.
By above-mentioned explanation as can be seen: of the present invention have the LCD driving mechanism of independent voltage conversion unit owing to have independently voltage conversion unit, therefore can provide bigger and more resilient voltage level.Moreover LCD driving mechanism of the present invention is owing to the source electrode drive circuit of signal by serial connection provided, help in LCD, to dwindle required flexible circuit board size, all can share the effect of this flexible circuit board to reach the different size LCD.
Claims (11)
1, a kind of LCD driving mechanism with independent voltage conversion unit, its electric power signal that receives the electric power supply circuit reaches the signal of video signal from system end, and the driving liquid crystal panel, it is characterized in that this LCD driving mechanism with independent voltage conversion unit comprises:
Gate drive circuit, it is positioned on the face glass;
A most source electrode drive circuit, it is positioned on this face glass;
Metallic signal lines, it is positioned on this face glass and receives this signal of video signal, this metallic signal lines comprises most metal wire sections, and metal wire sections is electrically connected between these source electrode drive circuits, and this metallic signal lines is transmitted this signal of video signal between these source electrode drive circuits; And
Voltage conversion unit, it is positioned on this face glass and receives this electric power signal, and this voltage conversion unit provides the not voltage signal of coordination standard, and via the metallic power line voltage signal is provided to this gate drive circuit and these source electrode drive circuits;
This each source electrode drive circuit comprises buffer-type signal of video signal receiving element, and this buffer-type signal of video signal receiving element further comprises:
Impact damper, it receives this signal of video signal of this system end or the signal of video signal of previous stage source electrode drive circuit;
Bus is switched the importation, and it is electrically connected to this impact damper and controlled by input select signal, selectivity receiving crystal pipe-transistor logic interface input signal or differential interface input signal;
Scrambler, it is electrically connected to this bus and switches importation and controlled by this input select signal, optionally with transistor-transistor logic interface input signal or the differential interface input signal is re-encoded as differential interface signal or transistor-transistor logic interface signal.
2, the LCD driving mechanism with independent voltage conversion unit according to claim 1 is characterized in that, this source electrode drive circuit also comprises:
The power adjustments part, it is electrically connected to this bus and switches the importation, switches the operating power that is fit to.
3, the LCD driving mechanism with independent voltage conversion unit according to claim 1 is characterized in that, this source electrode drive circuit also comprises:
The synchro control part, it is electrically connected to this scrambler, and it is synchronous to make sequential.
4, the LCD driving mechanism with independent voltage conversion unit according to claim 1 is characterized in that, this source electrode drive circuit also comprises:
Timing control unit, it provides this source electrode drive circuit frequency signal.
5, the LCD driving mechanism with independent voltage conversion unit according to claim 1 is characterized in that, this source electrode drive circuit also comprises:
Transceiver unit, it is from this scrambler received code signal of video signal, and the signal of video signal of should encoding is sent to the next stage source electrode drive circuit.
6, the LCD driving mechanism with independent voltage conversion unit according to claim 1 is characterized in that, this LCD driving mechanism with independent voltage conversion unit also comprises:
The passive component unit, it is positioned on the flexible circuit board and is electrically connected to this voltage conversion unit, and provides this voltage conversion unit required passive component.
7, the LCD driving mechanism with independent voltage conversion unit according to claim 6 is characterized in that, this passive component unit comprises most divider resistances that are connected to this voltage conversion unit input end.
8, the LCD driving mechanism with independent voltage conversion unit according to claim 7, it is characterized in that, this voltage conversion unit is a switched-mode power supply, and provides gate to open control voltage, gate closing control voltage, share driving voltage, reach gamma electric voltage.
9, the LCD driving mechanism with independent voltage conversion unit according to claim 1 is characterized in that, this voltage conversion unit is included as the input port of digital interface.
10, the LCD driving mechanism with independent voltage conversion unit according to claim 9 is characterized in that, this digital interface is Serial Peripheral Interface (SPI) or internal integrated circuit interface.
11, the LCD driving mechanism with independent voltage conversion unit according to claim 10, it is characterized in that, this voltage conversion unit also comprises digital analog converter, and it is to being changed by the Serial Peripheral Interface (SPI) or the digital signal of internal integrated circuit interface input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810085124A CN101540147A (en) | 2008-03-20 | 2008-03-20 | Liquid crystal display driving device with independent voltage conversion unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810085124A CN101540147A (en) | 2008-03-20 | 2008-03-20 | Liquid crystal display driving device with independent voltage conversion unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017190425A1 (en) * | 2016-05-05 | 2017-11-09 | 深圳市华星光电技术有限公司 | Gate electrode side fan-out area circuit |
| CN108172178A (en) * | 2017-12-13 | 2018-06-15 | 深圳市华星光电技术有限公司 | Power supply circuit, the liquid crystal display device of sequence controller |
| WO2021013123A1 (en) * | 2019-06-25 | 2021-01-28 | 咸阳彩虹光电科技有限公司 | Display apparatus |
| CN115588415A (en) * | 2022-12-08 | 2023-01-10 | 禹创半导体(深圳)有限公司 | Driving chip for LCD panel power supply system and LCD panel |
-
2008
- 2008-03-20 CN CN200810085124A patent/CN101540147A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017190425A1 (en) * | 2016-05-05 | 2017-11-09 | 深圳市华星光电技术有限公司 | Gate electrode side fan-out area circuit |
| CN108172178A (en) * | 2017-12-13 | 2018-06-15 | 深圳市华星光电技术有限公司 | Power supply circuit, the liquid crystal display device of sequence controller |
| WO2021013123A1 (en) * | 2019-06-25 | 2021-01-28 | 咸阳彩虹光电科技有限公司 | Display apparatus |
| CN115588415A (en) * | 2022-12-08 | 2023-01-10 | 禹创半导体(深圳)有限公司 | Driving chip for LCD panel power supply system and LCD panel |
| CN115588415B (en) * | 2022-12-08 | 2023-02-28 | 禹创半导体(深圳)有限公司 | Driving chip for LCD panel power supply system and LCD panel |
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Open date: 20090923 |