CN203311820U - Color screen module adopting SPI communication - Google Patents
Color screen module adopting SPI communication Download PDFInfo
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- CN203311820U CN203311820U CN2013203602174U CN201320360217U CN203311820U CN 203311820 U CN203311820 U CN 203311820U CN 2013203602174 U CN2013203602174 U CN 2013203602174U CN 201320360217 U CN201320360217 U CN 201320360217U CN 203311820 U CN203311820 U CN 203311820U
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Abstract
The utility model discloses a color screen module adopting SPI communication and relates to the technical field of TFT color screens. The color screen module adopting SPI communication comprises an RGB interface TFT color screen, a controller connected with and driving the RGB interface TFT color screen, module external communication interfaces electrically connected with the controller, a resistive touch screen, an LED backlight driving circuit and a TCON circuit, wherein the module external communication interfaces include an SPI interface, an interrupt signal interface and a hardware reset signal interface. The color screen module adopting SPI communication is a new scheme which is put forward against the defects of the prior art. The color screen module of the utility model includes three pixels which are 480*272, 640*480 and 800*480, adopts 4-wire SPI communication, has a built-in Chinese font and a graphics acceleration function and can drive a human-computer interface as a product under the control of a single chip microcomputer.
Description
Technical field
The present invention relates to TFT color screen technical field, particularly a kind of color screen module of using SPI communication.
Background technology
At present, the TFT screen is widely used in mobile phone.Existing TFT display screen is commonly rgb interface, and this interface need to constantly provide the HV signal pulse, if the common single-chip microcomputer do not driven with rgb interface uses the method for this sequential of simulation to drive, can't process other task at all again.
Even only having, the MCU driven with TFT or current existing TFT special driving chip ILI9341 or SSD2119 etc. get function ready by address, lifting a dot matrix number is that the simplest cls of 320*240 TFT screen is example, MCU must be to from coordinate (0,0) to coordinate (319,239), be total to 320*240=76800 pixel pointwise and write color data.This has just proposed high requirement to the processing speed of the MCU of drive TFT screen.Existing color screen drives module and drives mainly with the 16bit parallel port, but data line and control signal wire just reach 20, and this is unfavorable for the application scenario that the pin resource is more nervous.Existing RA8870 can only carry out the driving of free hand drawing layer to 320*240, two kinds of 16bit look TFT color screens of 480*272.
Summary of the invention
Fundamental purpose of the present invention is to solve not strong deficiency of rgb interface adaptability that TFT display screen in above-mentioned prior art adopts usually and the color screen module that provides a kind of SPI of use to communicate by letter.
The present invention solves the technical scheme that the prior art problem adopts: the module external communication interface, electric resistance touch screen, LED-backlit driving circuit and the TCON circuit that comprise rgb interface TFT color screen, connection and drive the controller of described rgb interface TFT color screen, be electrically connected with described controller; described electric resistance touch screen and described controller are electrically connected; the input end of described LED-backlit driving circuit is electrically connected to described controller, and the input end of the output terminal of described LED-backlit driving circuit and described TCON circuit and described rgb interface TFT color screen is electrically connected; Described module external communication interface comprises SPI interface, interrupt signal interface and hardware reset signal interface.
Below above technical scheme is further elaborated:
Further, described controller is the RA8875 control chip.
Further, also comprise a word-base chip be electrically connected with described controller.
Further, described word-base chip is GT23L32S4W standard Chinese character word-base chip.
Further, also comprise a crystal oscillator be electrically connected with described controller.
Further, described crystal oscillator is the 22.1184M quartz crystal oscillator.
Further, also comprise the power supply treatment circuit, described power supply treatment circuit is electrically connected to described controller.
Further, described SPI interface is 4-wire SPI interface.
The invention has the beneficial effects as follows:
One, along with TFT manufacturing process technology development maturation, the manufacturing cost of TFT screen is lower than monochromatic screen; The display screen of same area, the colored quantity of information embodied than monochromatic energy is larger also more attractive in appearance.Higher cost, lower price make increasing product use the TFT color screen instead and do man-machine interface.Particularly, the client has been not content with 3.5 cun or 4.3 cun this undersized man-machine interfaces, and this color screen module is namely the color screen module for 4.3,4.7,5.6,7 cun SPI interfaces of support of Vehicles Collected from Market demand release.
Its two, reduced the technical threshold of color screen application, make 8 common single-chip microcomputers for example 51 machines also can use the color screen to make man-machine interface attractive in appearance.
1. as long as can control monochromatic screen, just can control color screen;
2. adopt 4 line SPI interfaces, be applicable to the more nervous application scenario of pin resource;
3. reduced the workload of MCU: built-in Chinese word library only need to write to the register of color screen inside modules Hanzi internal code and just can show corresponding Chinese character; Built-in GUI function in a large number, only need send several instructions to the color screen module and just can realize glimmering such as cls, picture geometric figure, word amplification, regional roll screen, cursor.
The accompanying drawing explanation
Fig. 1 is the block diagram of a kind of color screen module of the SPI of use communication in the embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Below with reference to drawings and the specific embodiments, describe technical scheme of the present invention in detail, so as clearer, understand invention essence of the present invention intuitively.
Fig. 1 is the block diagram of a kind of color screen module of the SPI of use communication in the embodiment of the present invention.
With reference to shown in Figure 1, the color screen module 100 of a kind of SPI of the use communication in this embodiment comprises rgb interface TFT color screen 1, connects and drive the RA8875 control chip 2 of described rgb interface TFT color screen 1 and the module external communication interface 3 of this embodiment of module external communication interface 3(of being electrically connected with RA8875 control chip 2 comprises 4-wire SPI interface, look-at-me INT# and hardware reset signal RST#), electric resistance touch screen 4, LED-backlit driving circuit 5, TCON circuit 6, character library 7, crystal oscillator 8 and the power supply treatment circuit 9 of electric energy is provided to whole color screen module 100.
Wherein, described electric resistance touch screen 4 is electrically connected with described RA8875 control chip 3, the input end of described LED-backlit driving circuit 5 is electrically connected to described RA8875 control chip 3, the input end of the output terminal of described LED-backlit driving circuit 5 and described TCON circuit 6 and described rgb interface TFT color screen 1 is electrically connected, word-base chip 7 is electrically connected with described RA8875 control chip 2, crystal oscillator 8 is electrically connected with described RA8875 control chip 2, and described power supply treatment circuit 9 is electrically connected to described RA8875 control chip 2.
Below the correlation technique of the color screen module 100 of a kind of SPI of the use communication of the present embodiment is specifically introduced:
Rgb interface TFT color screen 1: support resolution to be respectively the rgb interface TFT color screen of 480*272,640*480,800*480.
RA8875 control chip 2: be liquid crystal display (TFT-LCD) controller of a word and Graphics Mode, can be in conjunction with word or 2D graphical application, maximum can be supported the small-medium size digitizing tablet of 800*480 point resolution.In the use of figure, support the BTE engine (Block Transfer Engine) of 2D, this function is compatible with general general 2D Bit BLT function, can process a large amount of graph data conversions and transmit.Built-in geometric figure accelerating engine (Geometric Speed-up Engine), provide the user to see through simple setting and easily draw straight line, rectangle, circle and oval geometric figure simultaneously.This controller has been integrated powerful function, as functions such as picture rolling function, demonstration floating frame, figure Pattern and word amplifications.
Module external interface 3:(1) the 4-wire SPI interface of extraneous single-chip microcomputer and color screen module communication, comprise SDI(data inputs), the output of SDO(data), the SCL(interface frequency), SCS(module gating) its maximum frequency speed is 2MHz; (2) the look-at-me INT# that sends of color screen module; (3) the hardware reset signal RST# of color screen module.
Electric resistance touch screen 4: adopt 4 wire resistive touchscreen.By 10 built-in ADC touch screen controllers of RA8875, control and use.
LED-backlit driving circuit 5: use MP3202 to form backlight voltage booster circuit, utilizing different resistance combinations that outside 3.3V power supply is converted to can be for TFT screen LED operating voltage backlight.From RA8875, draw pwm signal be used to controlling the FB(Feedback Input of MP3202) pin, to reach the effect of adjusting backlight luminance.
TCON circuit 6: for the electrical specification of 5.6 cun and 7 cun TFT-RGB screens, need to supply with VGH (Gate ON Voltage), VGL (Gate OFF Voltage), AVDD (Power for Analog Circuit), VCOM voltage to wafer in addition.We adopt TPS61040 to coordinate voltage stabilizing diode to form the TCON circuit to produce above-mentioned voltage.
Character library 7: use GT23L32S4W standard Chinese character word-base chip, this chip include the 11X12 dot matrix,
The Chinese character memory chip of 15X16 point, 24X24 dot matrix, 32X32 dot matrix, support GB2312 GB Chinese character
(contain national beacon committee legal authorization) and SCII character.
Crystal oscillator 8: use the 22.1184M quartz crystal oscillator.
Power supply treatment circuit 9: in power supply treatment circuit 9, use holding circuits such as having comprised TPS54331 and certain prevention short circuit, reversal connection, the direct supply that client is provided carries out the DC-DC conversion, to produce stable 3.3V for the color screen inside modules.
The color screen module 100 of a kind of SPI of use communication of this embodiment invention has overcome the deficiency of existing color screen module, has realized following functions: 1. make 8 common single-chip microcomputers also can easily use the man-machine interface of the more TFT color screen of pixel as product; 2. save the number of pins of Single-chip Controlling color screen module; 3. support that pixel is the 16bit true color digraph layer demonstration of 480*272; 4. support that pixel is the colored digraph layer demonstration of 8bit of 640*480,800*480.
The foregoing is only the preferred embodiments of the present invention; not thereby limit its scope of the claims; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to do; directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (8)
1. color screen module of using SPI communication; it is characterized in that: the module external communication interface, electric resistance touch screen, LED-backlit driving circuit and the TCON circuit that comprise rgb interface TFT color screen, connection and drive the controller of described rgb interface TFT color screen, be electrically connected with described controller; described electric resistance touch screen and described controller are electrically connected; the input end of described LED-backlit driving circuit is electrically connected to described controller, and the input end of the output terminal of described LED-backlit driving circuit and described TCON circuit and described rgb interface TFT color screen is electrically connected; Described module external communication interface comprises SPI interface, interrupt signal interface and hardware reset signal interface.
2. a kind of color screen module of using SPI communication according to claim 1, it is characterized in that: described controller is the RA8875 control chip.
3. a kind of color screen module of using SPI communication according to claim 1 is characterized in that: also comprise a word-base chip be electrically connected with described controller.
4. a kind of color screen module of using SPI communication according to claim 3, it is characterized in that: described word-base chip is GT23L32S4W standard Chinese character word-base chip.
5. a kind of color screen module of using SPI communication according to claim 1 is characterized in that: also comprise a crystal oscillator be electrically connected with described controller.
6. a kind of color screen module of using SPI communication according to claim 5, it is characterized in that: described crystal oscillator is the 22.1184M quartz crystal oscillator.
7. a kind of color screen module of using SPI communication according to claim 1, it is characterized in that: also comprise the power supply treatment circuit, described power supply treatment circuit is electrically connected to described controller.
8. a kind of color screen module of using SPI communication according to claim 1, it is characterized in that: described SPI interface is 4-wire SPI interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203602174U CN203311820U (en) | 2013-06-24 | 2013-06-24 | Color screen module adopting SPI communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203602174U CN203311820U (en) | 2013-06-24 | 2013-06-24 | Color screen module adopting SPI communication |
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| CN203311820U true CN203311820U (en) | 2013-11-27 |
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| CN2013203602174U Expired - Fee Related CN203311820U (en) | 2013-06-24 | 2013-06-24 | Color screen module adopting SPI communication |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106354688A (en) * | 2016-10-31 | 2017-01-25 | 亚世光电股份有限公司 | Intelligent module with drawing commands for driving TFT and touch screen through SPI interface |
-
2013
- 2013-06-24 CN CN2013203602174U patent/CN203311820U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106354688A (en) * | 2016-10-31 | 2017-01-25 | 亚世光电股份有限公司 | Intelligent module with drawing commands for driving TFT and touch screen through SPI interface |
| CN106354688B (en) * | 2016-10-31 | 2024-04-12 | 亚世光电(集团)股份有限公司 | Intelligent module for driving TFT and touch screen through SPI interface and carrying drawing instructions |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20131127 |
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| CX01 | Expiry of patent term | ||
| CU01 | Correction of utility model |
Correction item: Termination upon expiration of patent Correct: Revocation of Patent Expiration and Termination False: Expiration and Termination of 39 Volume 2801 Patent on July 11, 2023 Number: 28-01 Volume: 39 |
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| CU01 | Correction of utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |