CN1804689A - Design method for drive circuit module in liquid crystal display drive control chip - Google Patents
Design method for drive circuit module in liquid crystal display drive control chip Download PDFInfo
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- CN1804689A CN1804689A CN 200610041708 CN200610041708A CN1804689A CN 1804689 A CN1804689 A CN 1804689A CN 200610041708 CN200610041708 CN 200610041708 CN 200610041708 A CN200610041708 A CN 200610041708A CN 1804689 A CN1804689 A CN 1804689A
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- buffer
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- grayscale voltages
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Abstract
The invention discloses a driving circuit module designing method of liquid crystal display driving control chip. It adds 13 driving buffers in gamma adjusting circuit and needed not to add any driving buffer on the output end of the source driver.
Description
Technical field
The present invention relates to a kind of drive circuit module method for designing, the drive circuit module method for designing of particularly liquid crystal display drive controlling chip.
Background technology
In liquid crystal display Drive and Control Circuit chip, the effect of its drive circuit module is the color gray scale voltage signal that produces 64 grades, and drives the TFT-LCD display screen of capacitive load, makes it show various coloured images.In order to realize that high image quality, low-power consumption drive and show, be under the prerequisite that satisfies the load driving ability to the requirement of drive circuit module, reduce shared chip area and quiescent dissipation as far as possible.
With reference to Fig. 2, document " SAMSUNG S6D0110A Specification; 132RGB * 176dot 1-chip driverIC with internal GRAM for 262; 144Colors TFT-LCD; Ver0.7; April 24; 2003 " has been introduced a kind of drive circuit module method for designing of liquid crystal display drive controlling chip, at first produce the color gray scale voltage signal of 64 (6-bit colorful digital signal) grade by checking gamma circuit, select corresponding grayscale voltage through behind the decoding scheme, the driving Buffer through output terminal is added on the TFT-LCD display screen at last.In this traditional driving circuit topological structure, each output terminal of Source driver all is added with and drives Buffer, and the sum of required driving Buffer equates with the resolution of chip for driving at column direction.The advantage of this topological structure is to have very strong load driving ability, but shortcoming is to drive Buffer owing to each output terminal at Source driver all is added with, and causes drive circuit module to take very big chip area and the very big static power of consumption.As the drive controlling chip of a 132RGB resolution, need 396 to drive Buffer.Along with the resolution of Via Color TFT-LCD display screen and chip for driving thereof improves constantly, it is more and more serious that the defective of this topological structure will seem, the ultimate resolution that causes single chips to drive is subjected to the restriction of chip area and power consumption, and the cost of chip for driving increases.
Summary of the invention
Take very big chip area, deficiency that the chip quiescent dissipation is high in order to overcome the prior art drive circuit module, the invention provides a kind of drive circuit module method for designing of liquid crystal display drive controlling chip.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of drive circuit module method for designing of liquid crystal display drive controlling chip comprises the steps:
1) at first by resistance pressure-dividing network, produce circuit by 8 grades of grayscale voltages and produce 8 benchmark grayscale voltages, determine the basic configuration of γ calibration curve thus, and add a driving Buffer who is called one-level Buffer at the output terminal of each benchmark grayscale voltage;
2) 6 benchmark grayscale voltages with the centre take out medium voltage and insert a driving Buffer who is called secondary Buffer at its output terminal respectively behind electric resistance partial pressure, have so just obtained self having 13 grayscale voltages that drive Buffer;
3) at last these 13 grayscale voltages are input to the 64 grade grayscale voltages network that has a resistance, finally through further obtaining 64 grade grayscale voltages behind the electric resistance partial pressure, at the output terminal of Source driver, select corresponding grayscale voltage by decoding scheme, directly drive TFT-LCD display.
Described secondary drive Buffer must be noted that when inserting the electric resistance partial pressure relation that guarantees 64 grade grayscale voltages is constant, does not change with the shape that guarantees the γ calibration curve.
The number of described secondary drive Buffer is 6～11.
The invention has the beneficial effects as follows: because in the designed drive circuit module of the present invention, in checking gamma circuit, add 13 and drive Buffer, and do not need to add any driving Buffer at the output terminal of Source driver, greatly reduced the number and corresponding chip occupying area and the power consumption that drive Buffer.Equally for the drive controlling chip of a 132RGB resolution, the number that needs to drive Buffer is reduced to 13 by 396 of prior art, drives the Buffer number and is about original 3%, and irrelevant with the resolution of Drive and Control Circuit chip.
The present invention is further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the topology diagram of the designed drive circuit module of the drive circuit module method for designing of liquid crystal display drive controlling chip of the present invention
Fig. 2 is the topology diagram of the designed drive circuit module of the drive circuit module method for designing of prior art liquid crystal display drive controlling chip
Embodiment
With reference to Fig. 1, in the designed drive circuit module of the present invention, in checking gamma circuit, add 13 and drive Buffer, and do not need to add any driving Buffer at the output terminal of Source driver, directly connect the TFT-LCD display screen and get final product.This is to have less equivalent load capacitance owing to be used for the TFT-LCD display screen of mobile phone.
The principle of work of driving circuit is as follows.At first, produce circuit by 8 grades of grayscale voltages and produce 8 benchmark grayscale voltages, determine the basic configuration of γ calibration curve thus, and add a driving Buffer who is called one-level Buffer at the output terminal of each benchmark grayscale voltage by resistance pressure-dividing network.Then in order to strengthen the load driving ability, 6 benchmark grayscale voltages of centre are taken out medium voltage and insert a driving Buffer who is called secondary Buffer at its output terminal respectively behind electric resistance partial pressure, so just obtained self having 13 grayscale voltages that drive Buffer.At last these 13 grayscale voltages are input to the 64 grade grayscale voltages network that has a resistance, finally behind further electric resistance partial pressure, can obtain 64 grade grayscale voltages.At the output terminal of Source driver, select corresponding grayscale voltage by decoding scheme, directly drive TFT-LCD display.
When inserting secondary drive Buffer, must be noted that the electric resistance partial pressure relation that guarantees 64 grade grayscale voltages is constant, do not change with the shape that guarantees the γ calibration curve.
The load driving ability of output terminal is except outside the Pass the driving force that drives Buffer with 13 of fronts has, and is also relevant with the 64 grade grayscale voltages order of magnitude of resistance that has a resistance in the network.This resistance value is littler, and the load driving ability is bigger, and chip occupying area is littler, but the static power that is consumed in resistor voltage divider network is bigger.
For different TFT-LCD display screens, the size of its equivalent load capacitance is also inequality.In order to make drive circuit module under the prerequisite that satisfies the load driving ability, the static power that takies minimum chip area and consume minimum must be optimized design to the TFT-LCD driving circuit of above-mentioned novel topological structure and compromise is considered.If do not consider area factor, can further increase the number of secondary drive Buffer, generally should be more than 5, and the have a resistance resistance of resistance in the network of corresponding increase by 64 grade grayscale voltages, make quiescent dissipation reach minimum.
Claims (3)
1, a kind of drive circuit module method for designing of liquid crystal display drive controlling chip comprises the steps:
1) at first by resistance pressure-dividing network, produce circuit by 8 grades of grayscale voltages and produce 8 benchmark grayscale voltages, determine the basic configuration of γ calibration curve thus, and add a driving Buffer who is called one-level Buffer at the output terminal of each benchmark grayscale voltage;
2) 6 benchmark grayscale voltages with the centre take out medium voltage and insert a driving Buffer who is called secondary Buffer at its output terminal respectively behind electric resistance partial pressure, have so just obtained self having 13 grayscale voltages that drive Buffer;
3) at last these 13 grayscale voltages are input to the 64 grade grayscale voltages network that has a resistance, finally through further obtaining 64 grade grayscale voltages behind the electric resistance partial pressure, at the output terminal of Source driver, select corresponding grayscale voltage by decoding scheme, directly drive TFT-LCD display.
2, the drive circuit module method for designing of liquid crystal display drive controlling chip according to claim 1, it is characterized in that: described secondary drive Buffer, must be noted that when inserting the electric resistance partial pressure relation that guarantees 64 grade grayscale voltages is constant, do not change with the shape that guarantees the γ calibration curve.
3, the drive circuit module method for designing of liquid crystal display drive controlling chip according to claim 1 and 2 is characterized in that: the number of described secondary drive Buffer is 6～11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100417087A CN100389343C (en) | 2006-01-20 | 2006-01-20 | Design method for drive circuit module in liquid crystal display drive control chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100417087A CN100389343C (en) | 2006-01-20 | 2006-01-20 | Design method for drive circuit module in liquid crystal display drive control chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1804689A true CN1804689A (en) | 2006-07-19 |
| CN100389343C CN100389343C (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100417087A Expired - Fee Related CN100389343C (en) | 2006-01-20 | 2006-01-20 | Design method for drive circuit module in liquid crystal display drive control chip |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6778161B2 (en) * | 2001-04-27 | 2004-08-17 | Industrial Technology Research Institute | Central symmetric gamma voltage correction circuit |
| KR100909052B1 (en) * | 2002-12-31 | 2009-07-23 | 엘지디스플레이 주식회사 | Gamma Reference Voltage Circuit of LCD |
| TWI302279B (en) * | 2003-11-04 | 2008-10-21 | Novatek Microelectronics Corp | Driver circuit for display and flat panel display |
| JP4179194B2 (en) * | 2004-03-08 | 2008-11-12 | セイコーエプソン株式会社 | Data driver, display device, and data driver control method |
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2006
- 2006-01-20 CN CNB2006100417087A patent/CN100389343C/en not_active Expired - Fee Related
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| CN100389343C (en) | 2008-05-21 |
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Owner name: NORTHWESTERN POLYTECHNICAL UNIVERSITY Free format text: FORMER OWNER: XI'AN NORTHWESTERN POLYTECHNICAL UNIVERSITY TECHNOLOGY INDUSTRY GROUP CO., LTD. Effective date: 20070727 |
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Application publication date: 20060719 Assignee: Shenzhen Qiaofeng Technology Co., Ltd. Assignor: Northwestern Polytechnical University Contract record no.: 2010440000302 Denomination of invention: Design method for drive circuit module in liquid crystal display drive control chip Granted publication date: 20080521 License type: Exclusive License Record date: 20100407 |
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