CN205541828U - Color liquid crystal display of compatible ST7920 controller instruction - Google Patents

Abstract

The utility model discloses a color liquid crystal display of compatible ST7920 controller instruction, including TFT display screen, ST7920 controller, LPC1114 main control chip and user interface, its characterized in that: the ST7920 controller be connected with TFT display screen and LPC1114 main control chip respectively, last parallel user interface and the serial user interface who is used for realizing data transmission that be equipped with of LPC1114 main control chip, parallel user interface be 8 parallel -by -bit interfaces, serial user interface is three -way SPI serial interface or four -wire SPI serial interface. The utility model discloses make the user can not increase software secondary development cost, can escalate into the control machine that shows the interface for the colored TFT who has better display effect to the monochromatic liquid crystal display that uses who continues to use as the control machine at interface, synthesize the whole display effect that promotes industry control occasion man -machine interface to can the biggest promotion product grades under the cost -effective condition, strengthened the competitiveness of product on market.

Description

Compatible ST7920 The colour liquid crystal display device of controller instruction

Technical field

The utility model relates to a kind of colour liquid crystal display device, the colour liquid crystal display device of a kind of compatible ST7920 controller instruction.

Background technology

In the last few years, along with developing rapidly of domestic national brand, by taking the strategies such as low price, already taking up the superiority in low side man-machine interface market, winning the accreditation of users.International top-brand is also gradually researching and developing its economical product, to seize the share of low-end market.While it is true, due to doing things steadily and surely in low-end market, domestic man-machine interface manufacturer overall performance presents the state of quickly growth.

Although low side man-machine interface user occupies the biggest share, and the industry to comparative maturities such as lathe, textile machine, electronic equipments in China, develop the history having decades, there is also the demand that device upgrade is regenerated in the long term.But during this upgrades, constantly have that some are little, use the producer comparing low-end product to be eliminated always, therefore, also there is a lot of enterprise during renewal of the equipment flies, demand is reorientated, looks for those and can meet their development plan, help them to improve the equipment supplier of self productivity.

In view of this demand to middle and high end man-machine interface, the change of later man-machine interface, will in shape, in idea, the aspect such as application scenario all changes, thus brings changing again and again of industrial computer core technology.Generally speaking, the future developing trend of man-machine interface is six modernizations: the nationalization of platform embeddingization, brand, device intelligence, interface fashion-orientation, communication network and energy-conserving and environment-protective.

LCD MODULE is the core of man-machine interface, but traditional LCD MODULE, the 4X8C LCD MODULE with 7920 controllers as core as big in existing market occupation rate, the structure used is Polarizer, optical filter, membrane transistor, common electrode and nesa coating composition, overall display effect is affected bigger by visible angle, luminous by backlight, directly it is incident upon on the liquid crystal panel of special substance, the view effect difference caused in different angles is very big, there is poor contrast, color is not good enough, visible angle is little problem.

Therefore, my department combines current trend and market, constantly releases the display module interface facilitating client to use, and through software, complicated display operation is integrated packing, and making curstomer-oriented is a kind of simple interface operation, product up-gradation is used in the short cycle.

Summary of the invention

For problem of the prior art, it is that display module, LPC1114 microprocessor based on M0 kernel are as the control chip of display module using TFT color screen that the utility model provides a kind of, by using size, interface and the LCD MODULE of completely compatible 7920 controllers of function so that user directly uses color screen to replace traditional single color LCD screen.

The technical solution of the utility model is: the colour liquid crystal display device of compatible ST7920 controller instruction, including TFT display screen, ST7920 controller, LPC1114 main control chip and user interface, it is characterized in that: described ST7920 controller is connected with TFT display screen and LPC1114 main control chip respectively, LPC1114 main control chip is provided with the concurrent user interface for realizing data transmission and serial user interface.

Wherein, described concurrent user interface is 8 parallel-by-bit interfaces, and serial user interface is three line SPI serial line interfaces or four line SPI serial line interfaces.

Wherein, described ST7920 controller connects word-base chip, and the character library carried includes Chinese word library and ASCII character character library.

Wherein, described ST7920 controller is built-in with graphic display data holder, to realize the Dynamic Announce of figure.

Wherein, described ST7920 controller connects the confession electric treatment circuit that can regulate voltage；Described ST7920 controller connects the DC-DC power source modular converter that can realize wide pressure input.

Feature of the present utility model is: 1) software function realizes the instruction of interface compatibility OCMJ4X8C control IC, and by timing simulation instruction interface, figure layer video memory is set up in inside, it is achieved overlap-add operation, with the display feature operation of compatible 4X8C.2) having two kinds of different user interface mode to select to use, client can select different interface modes, flexibly and easily voluntarily.3) height displays contrast, and display effect becomes clear bright-coloured, suitable low temperature harshness working environment.4) terminal operation instruction simply and easily, integrated Chinese and English mixed display instruction, only need to send out international standard characters symbol and just can show Chinese simply, other graphics commands the most integrated such as: drawing point, setting-out, draw rectangle, draw circle, ellipse, triangle etc. instructs.

The beneficial effects of the utility model are: 1) economic benefit: user can not increase software secondary development cost, can be shown as the machine upgrading that controls at interface with single color LCD become the control machine of the colored TFT display interface with more preferable display effect continue to use；Energy maximum lift product specification in the case of cost-effective, improving product is in the competitiveness in market.2) social benefit: the comprehensive overall display effect promoting industry control occasion man-machine interface and product specification.

Accompanying drawing explanation

Fig. 1 is circuit block diagram of the present utility model.

Detailed description of the invention

Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described further:

As shown in Figure 1, the colour liquid crystal display device of compatible ST7920 controller instruction, including TFT display screen, ST7920 controller, LPC1114 main control chip and user interface, it is characterized in that: described ST7920 controller is connected with TFT display screen and LPC1114 main control chip respectively, LPC1114 main control chip is provided with the concurrent user interface for realizing data transmission and serial user interface.

In the present embodiment, described concurrent user interface is 8 6800 or 8080 parallel interfaces, and serial user interface is three line SPI serial line interfaces or four line SPI serial line interfaces；Described ST7920 controller connects word-base chip, and the character library carried includes Chinese word library and ASCII character character library, and is built-in with graphic display data holder, to realize the Dynamic Announce of figure；Meanwhile, described ST7920 controller is also associated with realizing the DC-DC power source modular converter of wide pressure input, and can regulate the confession electric treatment circuit of voltage.

The utility model is the colorized lcd display model that a band character library controls, and visible pixel point is 320 x 240, and controllable pixels point is 128 x 64.Can Display of Chinese characters and figure, built-in GB GB2312 code simplified form of Chinese Character character library (16X16 dot matrix), 128 characters (8X16 dot matrix) and 64X256 lattice display RAM(GDRAM).Can be with CPU direct interface, it is provided that two kinds of interfaces connect microprocessor: 8-parallel-by-bit and two kinds of connected modes of serial.This colorized lcd display model can have the plurality of specifications such as 2.4 inch band character library type 128x64 dot matrix TFT display modules, 2.8 inch band character library type 128x64 dot matrix TFT display modules and 3.2 inch band character library type 128x64 dot matrix TFT display modules.

The microprocessor of Cortex-M0 kernel involved by the utility model, SPI serial line interface, 128 X 64 show module, and its concrete feature is:

1, the microprocessor of Cortex-M0 kernel:

What this project patent used is, and microchip controller is the LPC1114 of NXP, and maximum feature is the design of low-power consumption.Cortex-M0 is 32,3 level production line risc processors, operational capability can reach 0.9 DMIPS/MHz, and with other 16 compared with 8 bit processors, owing to the operational performance of M0 is greatly improved, so CortexM0 only needs the relatively low speed of service in the execution of same task, and significantly reduce the dynamic power consumption of entirety.

2, SPI serial line interface:

SPI is the abbreviation of Serial Peripheral Interface (SPI) (Serial Peripheral Interface).SPI, it it is a kind of high speed, full duplex, the communication bus synchronized, and on the pin of chip, only take up four lines, save the pin of chip, it it is saving space in the layout of PCB simultaneously, it is convenient to provide, be just in order at this characteristic easy to use, nowadays this communication protocol of increasing integrated chip.The communication of SPI works with master-slave mode, and this pattern generally has a main equipment and one or more from equipment, needs at least 4 lines, in fact 3 can also (during one-way transmission).Also being that all equipment based on SPI is total, they are the inputs of SDI(data), the output of SDO(data), SCLK(clock), the choosing of CS(sheet), wherein: 1) input of SDI main equipment data, input from device data；2) SDO main equipment data output, exports from device data；3) SCLK clock signal, is produced by main equipment；4) CS enables signal from equipment, by main equipment control.

3,128 X 64 based on 7920 controllers show module:

128X64-0402B with Chinese word library often shields the Chinese character that can show that 4 row 8 arrange totally 32 16 × 16 dot matrix, each display random access memory can show 1 Chinese character or 2 16 × 8 dot matrix overall height ASCII character characters, the most often shields and at most can realize 32 Chinese characters or the display of 64 ASCII character characters.Internal character display random access memory buffering area (DDRAM) that 128 × 2 bytes are provided of 128X64-0402B with Chinese word library.Character shows by character code displaying writes the realization of this character display random access memory.According to write content difference, can be respectively at liquid crystal screen display CGROM(Chinese word library), HCGROM(ASCII code word storehouse) and the self-defined font of CGRAM() content.The selection coding range of three kinds of kinds of characters/fonts is: 0000～0006H(its code is 0000,0002,0004,0006 totally 4 respectively) show self-defined font, 02H～7FH shows half-breadth ASCII character character, A1A0H～F7FFH shows 8192 kinds of GB2312 Chinese word library fonts.Character display random access memory address 80H～9FH in Liquid Crystal Module.There is relation one to one the address of the RAM that character shows and 32 character display area.

Described in above-described embodiment and specification, principle of the present utility model and most preferred embodiment are simply described; on the premise of without departing from the utility model spirit and scope; the utility model also has various changes and modifications, in the range of these changes and improvements both fall within claimed the utility model.

Claims (6)

1. the colour liquid crystal display device of compatible ST7920 controller instruction, including TFT display screen, ST7920 controller, LPC1114 main control chip and user interface, it is characterized in that: described ST7920 controller is connected with TFT display screen and LPC1114 main control chip respectively, LPC1114 main control chip is provided with the concurrent user interface for realizing data transmission and serial user interface.

The colour liquid crystal display device of compatible ST7920 controller instruction the most according to claim 1, it is characterised in that: described concurrent user interface is 8 parallel-by-bit interfaces, and serial user interface is three line SPI serial line interfaces or four line SPI serial line interfaces.

The colour liquid crystal display device of compatible ST7920 controller instruction the most according to claim 1, it is characterised in that: described ST7920 controller connects word-base chip.

The colour liquid crystal display device of compatible ST7920 controller instruction the most according to claim 1, it is characterised in that: described ST7920 controller is built-in with graphic display data holder.

The colour liquid crystal display device of compatible ST7920 controller instruction the most according to claim 1, it is characterised in that: described ST7920 controller connects the confession electric treatment circuit that can regulate voltage.

The colour liquid crystal display device of compatible ST7920 controller instruction the most according to claim 1, it is characterised in that: described ST7920 controller connects the DC-DC power source modular converter that can realize wide pressure input.