CN1996456A - LCD drive and control device - Google Patents
LCD drive and control device Download PDFInfo
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- CN1996456A CN1996456A CN 200510112273 CN200510112273A CN1996456A CN 1996456 A CN1996456 A CN 1996456A CN 200510112273 CN200510112273 CN 200510112273 CN 200510112273 A CN200510112273 A CN 200510112273A CN 1996456 A CN1996456 A CN 1996456A
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Abstract
A LCD drive and control device comprises a LCD driver, microcontroller, key matrix and LCD panel connected with the LCD display drive, features in the key scanning output port of the port of the LCD display drive, connecting with the LCD panel and the key matrix, interrupt the display between the output of frames of data, scanning the output signal at the interruption of display. It simplifies the LCD drive circuit with reduced cost.
Description
Affiliated technical field
The invention belongs to liquid crystal display driving and control device, particularly about a kind of liquid crystal display driving and control device with the key scan function.
Background technology
The liquid crystal display of existing band key scan function drives (LCD) circuit, is made up of key-press matrix, LCD driver, display panels, microcontroller usually.Wherein microcontroller links to each other with LCD driver, with the control LCD driver; Key-press matrix also links to each other with LCD driver, with input instruction or displaying contents; LCD driver links to each other with display panels, and required content displayed is shown on display panels.
As shown in Figure 1, Fig. 1 is the connectivity scenario of existing microcontroller and LCD driver.Microcontroller is connected with data-out port 1, data-in port 2, clock signal input terminal mouth 3 and the enable signal input port 4 of LCD driver among Fig. 1.Wherein the signal flow of data-out port 1 is to being to microcontroller by LCD driver; The signal flow of other three ports is to being to LCD driver by microcontroller.Data-out port 1 also is connected with power supply by resistance device.
As shown in Figure 2, Fig. 2 is the connectivity scenario of existing LCD driver and display panels and key-press matrix.Key-press matrix links to each other with key scan output port 6 with several key scan input ports 5 of LCD driver among Fig. 2.Wherein, the signal flow of key scan input end is to being to LCD driver by key-press matrix; The signal flow of key scan output terminal is to being to key-press matrix by LCD driver.Each road key scan input connection all connects power supply by resistance device.LCD driver is connected with display panels by its several liquid crystal display drive signal output ports 7, and signal flow is to being to display panels by LCD driver.
By Fig. 1 and Fig. 2 as can be known, the liquid crystal display drive circuit of present band key scan function has the following disadvantages:
1, during the communication between LCD driver and the microcontroller, two different ports are adopted in the input and output of data, cause increasing of aerial lug;
2, the key scan function of liquid crystal display drive circuit needs special-purpose scanning input and scanning output pin to realize, causes increasing of chip pin, has increased the cost of chip;
3, the key scan input port of liquid crystal display drive circuit needs outer connecting/pull down resistor.
Summary of the invention
The object of the present invention is to provide a kind of liquid crystal display driving and control device to overcome the deficiencies in the prior art, simplify liquid crystal display drive circuit, reduce cost.
For realizing this goal of the invention, the invention provides a kind of liquid crystal display driving and control device, comprise LCD driver, and the microcontroller, key-press matrix and the display panels that are connected with this LCD driver respectively, the row multiplexed port of described LCD driver is the key scan output port, be connected with key-press matrix with display panels simultaneously, export between the one piece of data and following one piece of data that shows to display panels at the row port, allow show temporary transient the interruption, scan output signal to the key-press matrix output key during breaking hereinto.
Wherein, the shared pin of the data-out port of described LCD driver and microcontroller and data-in port.Described LCD driver is drawn or pull down resistor on realizing one in its key scan input port inside, in order to replace original outer meeting resistance.Described LCD driver support m capable * the n row show and j * k key-press matrix, then in n row port j row multiplexed port being arranged is that key scan is exported, wherein m, n, j, k are natural number, j≤n.In described LCD driver n the row port, the 1st row port～j row multiplexed port is key scan output.Described one piece of data is a frame, multiframe or less than one frame.
The invention has the beneficial effects as follows: 1, between LCD driver and the microcontroller during communication, the input and output of data change a port into by two ports, have simplified outside line; 2, remove the key scan output pin of liquid crystal display drive circuit, saved chip cost; 3, remove the key scan input port on draw or pull down resistor, reduced external devices, saved the complete machine cost.
Description of drawings
Fig. 1 is the connectivity scenario of existing microcontroller and LCD driver;
Fig. 2 is the connectivity scenario of existing LCD driver and display panels and key-press matrix;
Fig. 3 is the connection diagram of key-press matrix of the present invention and display panels and LCD driver;
Fig. 4 is the sequential chart of key scan among the present invention;
Fig. 5 is the connection diagram of microcontroller of the present invention and LCD driver;
Fig. 6 is the synoptic diagram of a specific embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done more detailed explanation:
At first see also Fig. 3, Fig. 3 is the connection diagram of key-press matrix of the present invention and display panels and LCD driver.In Fig. 3, only there is key scan input port 5 to be connected between LCD driver and the key-press matrix, connect and saved key scan output.The part 71 of the liquid crystal display drive signal output port that is connected between LCD driver and the display panels only links to each other with display panels, and this part liquid crystal display drive signal output terminal comprises all capable ports (COM) and part rows port (Seg).Another part 72 links to each other with key-press matrix with display panels with the row port that the key scan output of key-press matrix equates simultaneously, to realize multiplexed port.
In addition, in Fig. 3, originally be used for the resistance device that the key scan input port connects power supply and be integrated into the LCD driver chip internal, simplified the connection complexity of device.
See also Fig. 4, Fig. 4 is the sequential chart of key scan among the present invention.Because the row multiplexed port respectively as key scan output and the output of liquid crystal display drive signal, therefore, need distribute its signal output.Preferably can export between the frame data and next frame data of demonstration to display panels, allow show temporary transient the interruption, scan output signal to the key-press matrix output key during breaking hereinto at the row port.Certainly also can adopt output multiframe or field data interruption once with transmission key scan output signal at some embodiment, but this might cause the decline of image quality.
See also Fig. 5, Fig. 5 is the connection diagram of microcontroller of the present invention and LCD driver.In Fig. 5, consider that communicating by letter between LCD driver and the microcontroller can be timesharing, promptly do not need simultaneously data-out port from LCD driver to the microcontroller output data, and receive the director data that microcontroller is sent from the data-in port of LCD driver.For the purpose of the complicacy that reduces external circuit, the present invention exports the data input of microcontroller and LCD driver and data to be connected and is incorporated in a port one 1 and carries out.Therefore the input/output end port 11 of LCD controller can carry out to timesharing the data transmission between microcontroller and the LCD driver.
See also Fig. 6, Fig. 6 is a specific embodiment of the present invention.Liquid crystal display driving and control device among Fig. 6 adopt 3 line interfaces: promptly enable port 4, clock port 3, data input/outbound port 11 between its LCD driver and the microcontroller.The maximum liquid crystal display of supporting 32 row *, 4 row of this device.It supports one 12 * 2 key-press matrix, and wherein the 1st～the 12nd row multiplexed port is key scan output.Two key scan input ports do not need outer connecting to draw or pull down resistor, but with this incorporating resistor in the LCD driver chip internal.Among the embodiment as shown in Figure 6, has resistance device between data input/outbound port and the system power supply.One group of drive output that is used to drive display panels is by 4 capable ports (COM1～COM4) and 20 row port (Seg13～Seg32) form.Another group is used to drive the drive output of display panels, by 12 Seg (Seg1～Seg12) form, and can be multiplexed with 12 key scan output ports.By 2 key scan input ports (KEY1, KEY2) and 12 2 * 12 key-press matrixs that the key scan output port is formed.
Clearly, in the certain other embodiments of the present invention, LCD driver can be supported any row demonstration of row and key-press matrix arbitrarily arbitrarily, as long as key scan output number is less than or equal to the row port number.And the order of multiplexing row port also can be selected at random.
That more than introduces only is based on several preferred embodiment of the present invention, can not limit scope of the present invention with this.Any method of the present invention is done replacement, the combination, discrete of step well know in the art, and the invention process step is done well know in the art being equal to change or replace and all do not exceed exposure of the present invention and protection domain.
Claims (7)
1, a kind of liquid crystal display driving and control device, comprise LCD driver, and the microcontroller, key-press matrix and the display panels that are connected with this LCD driver respectively, it is characterized in that: the row multiplexed port of described LCD driver is the key scan output port, be connected with key-press matrix with display panels simultaneously, export between the one piece of data and following one piece of data that shows to display panels at the row port, allow show temporary transient the interruption, scan output signal to the key-press matrix output key during breaking hereinto.
2, liquid crystal display driving as claimed in claim 1 and control device is characterized in that the data-out port and the shared pin of data-in port of described LCD driver and microcontroller.
3, liquid crystal display driving as claimed in claim 1 and control device is characterized in that drawing or pull down resistor on the key scan input port of described LCD driver is built-in.
4, liquid crystal display driving as claimed in claim 1 and control device, it is characterized in that described LCD driver support m capable * the n row show and j * k key-press matrix, it is key scan output that j row multiplexed port then arranged in n row port, and wherein m, n, j, k are natural number, j≤n.
5, liquid crystal display driving as claimed in claim 4 and control device is characterized in that in described LCD driver n the row port, and the 1st row port～j row multiplexed port is key scan output.
6, liquid crystal display driving as claimed in claim 1 and control device is characterized in that described one piece of data is a frame.
7, liquid crystal display driving as claimed in claim 1 and control device is characterized in that described one piece of data is multiframe or less than one frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101122736A CN100464367C (en) | 2005-12-28 | 2005-12-28 | LCD drive and control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101122736A CN100464367C (en) | 2005-12-28 | 2005-12-28 | LCD drive and control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1996456A true CN1996456A (en) | 2007-07-11 |
| CN100464367C CN100464367C (en) | 2009-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101122736A Active CN100464367C (en) | 2005-12-28 | 2005-12-28 | LCD drive and control device |
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| CN (1) | CN100464367C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890349A (en) * | 2011-07-20 | 2013-01-23 | 盛群半导体股份有限公司 | Liquid crystal display device with a light guide plate |
| CN103354453A (en) * | 2013-06-27 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Circuit and method having port multiplexing of indication lamp and button |
| CN103544922A (en) * | 2012-07-09 | 2014-01-29 | 凌通科技股份有限公司 | Liquid crystal display and keyboard scan compatible circuit and electronic product using same |
| CN104113348A (en) * | 2013-04-19 | 2014-10-22 | 江苏沁恒股份有限公司 | Device for button scanning under multi-digit nixie tube driving environment and control method |
| CN109976226A (en) * | 2019-04-19 | 2019-07-05 | 深圳市蔚蓝方舟科技有限公司 | The monitoring and display system of water-powered slide plate |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2171179Y (en) * | 1993-02-18 | 1994-07-06 | 系统电子工业股份有限公司 | Multiple frequency type keyboard input device |
| CN2197716Y (en) * | 1994-03-04 | 1995-05-17 | 张冶 | Matrix liquid crystal displaying recorder |
| CN2197715Y (en) * | 1994-04-21 | 1995-05-17 | 雷明凯 | Instrument for karaoke |
| US5724069A (en) * | 1994-07-15 | 1998-03-03 | Chen; Jack Y. | Special purpose terminal for interactive user interface |
| CN1081371C (en) * | 1999-04-21 | 2002-03-20 | 广州市光机电工程研究开发中心 | Automatic fill-on device for deposit and drawn receipts of bank |
| US6788529B2 (en) * | 2002-04-19 | 2004-09-07 | Hewlett-Packard Development Company, L.P. | Portable computer having multiport bay |
| CN2556722Y (en) * | 2002-04-30 | 2003-06-18 | 朱奔野 | Full interaction video device |
| CN2671028Y (en) * | 2003-12-31 | 2005-01-12 | 沈阳新松机器人自动化股份有限公司 | Chinese character programming demonstrator |
-
2005
- 2005-12-28 CN CNB2005101122736A patent/CN100464367C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890349A (en) * | 2011-07-20 | 2013-01-23 | 盛群半导体股份有限公司 | Liquid crystal display device with a light guide plate |
| CN102890349B (en) * | 2011-07-20 | 2015-04-08 | 盛群半导体股份有限公司 | Liquid crystal display device with a light guide plate |
| CN103544922A (en) * | 2012-07-09 | 2014-01-29 | 凌通科技股份有限公司 | Liquid crystal display and keyboard scan compatible circuit and electronic product using same |
| CN103544922B (en) * | 2012-07-09 | 2015-11-18 | 凌通科技股份有限公司 | Liquid crystal display and keyboard scan compatible circuit and use its electronic product |
| CN104113348A (en) * | 2013-04-19 | 2014-10-22 | 江苏沁恒股份有限公司 | Device for button scanning under multi-digit nixie tube driving environment and control method |
| CN104113348B (en) * | 2013-04-19 | 2017-07-18 | 江苏沁恒股份有限公司 | Device and control method for the key scan under multidigit nixie tube drive environment |
| CN103354453A (en) * | 2013-06-27 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Circuit and method having port multiplexing of indication lamp and button |
| CN109976226A (en) * | 2019-04-19 | 2019-07-05 | 深圳市蔚蓝方舟科技有限公司 | The monitoring and display system of water-powered slide plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100464367C (en) | 2009-02-25 |
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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co., Ltd Address before: 214061 Jiangsu city of Wuxi province Liangxi Road No. 14 Patentee before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |