Custom Yellow LCD Screen for Tax Control Invoice Machine

General Specification：

OPERTING VOLTAGE:3.3V                         OPERATING CURRENT:2.0mA MAX

DISPLAY TYPE:VTN NEGATIVE                  POLARIZER MODE:TRANSMISSIVE

LCD DRIVE:1/32DUTY  1/68BIAS 9.5V      VIEW DIRECTION:6:00 O'CLOCK

LCD CONTROLLER:uc1617s                       BACK LIGHT:---

DEFAULT TOLERANCE:+/-0.3

ABSOLUTE MAXIMUM RATINGS：

Display Image

Application：

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Introducing the VATN LCD screen - the ultimate solution for your electric water heater needs! This cutting-edge screen is designed to provide you with the best possible viewing experience, so you can easily monitor and control your water heater with ease.

With its advanced technology, the VATN LCD screen is able to display crystal-clear images and text, making it easy to read and understand. Whether you're adjusting the temperature, setting a timer, or checking the status of your water heater, this screen has got you covered.

What's more, the VATN LCD screen is incredibly easy to install and use. Simply connect it to your electric water heater and you're ready to go! Plus, its sleek and modern design will complement any home decor, adding a touch of sophistication to your living space.

So why settle for anything less than the best? Upgrade your electric water heater with the VATN LCD screen today and enjoy the convenience and peace of mind that comes with having full control over your hot water supply.

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Working principle of TFT-LCD liquid crystal display

Design of TFT-LCD driving circuit

The VGA interface signal is converted to the analog LCD display driver circuit, using ADI high performance DSP chip ADSP-21160 to achieve the main function of the drive circuit.

Hardware circuit design

AD9883A is a high-performance three channel video ADC can simultaneously achieve real-time sampling of RGB tricolor signal. The system uses 32 bit floating-point ADSP-21160 chip to process the data, can complete the real-time gamma correction, time base correction, image processing and optimization, to meet the performance requirements of the system. ADSP-21160 has 6 independent high speed 8 bit parallel link junctions, which are connected to the front end of the ADSP-21160 analog to digital conversion chip AD9883A and the back-end digital to analog conversion chip ADV7125. ADSP-21160 has a super Harvard architecture, support single instruction operand (SIMD) mode, using programming language to achieve the efficient compilation of real-time processing of video signal, not because of long time delay and data processing.

System hardware schematic diagram shown in figure 1. The system can complete the input and output by using different chain junctions. Analog video signal from AD9883A to complete analog to digital conversion. AD9883A is a three channel ADC, so the system can complete monochrome video signal processing, color video signal processing can also be completed. The sampled digital video signal is input to the ADSP-21160 through the chain intersection, and the output signal is output to ADV7125 after different processing. ADV7125 is a three channel DAC, can also be used to deal with color signals. The output video signal to the gray voltage generation circuit, the drive voltage required to drive the LCD screen. ADSP-21160 also has a universal programmable I/O flag pin, which can be used to accept external control signals, send control information to the system and its modules in order to make the whole system work stably and orderly. For example, ADSP-21160 provides the necessary control signals for the grayscale voltage generation circuit and the LCD screen. In addition, the system also set up a number of LED lights, used to visually indicate the system hardware and DSP internal procedures for each module working state.