Vcom (voltage of common electrode) adjustment device and method of MIPI (mobile industry processor interface) liquid crystal module on basis of FPGA (field programmable gate array)

Abstract

The invention discloses a Vcom (voltage of common electrode) adjustment device of an MIPI (mobile industry processor interface) liquid crystal module on the basis of FPGA (field programmable gate array). The Vcom adjustment device comprises an upper computer interaction module, an ARM (advanced RISC machine) controller and an MIPI liquid crystal module to be measured. The Vcom adjustment device is characterized by comprising an FPGA signal unit, the upper computer interaction module is connected with the ARM controller through an internet access, the ARM controller is connected with the FPGA signal unit through an external bus interface, and the FPGA signal unit is connected with the MIPI liquid crystal module to be measured. The MIPI bridge chip in a multichannel testing system of the liquid crystal module can be omitted, OTP (one time password) development efficiency of the MIPI liquid crystal module is improved, various requirements of the liquid crystal module on the basis of the MIPI protocol are met, and production efficiency of the liquid crystal module is improved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal module testing, in particular to an FPGA-based MIPI liquid crystal module Vcom adjustment device and method. Background technique [0002] Vcom (Voltage of Common electrode, common electrode voltage) is a voltage value at the panel terminal of the liquid crystal module, which is determined by the characteristics of the liquid crystal and the working principle of the liquid crystal module. There is a positive and negative deflection voltage in the driving circuit of the panel (module), Vcom It needs to be set at the center of the positive and negative deflection voltages. By adjusting the value of Vcom, the Flicker (flicker) value of the Panel control can be adjusted to the minimum, so that the display effect of the Panel can reach the best. Only relying on human eyes to observe and adjust the Vcom voltage will cause deviations. For several higher frequencies such as 120Hz and 240Hz, people ...

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Problems solved by technology

[0004] 1. In this solution, each bridge chip can only correspond to one module. For a multi-channel LCD module test system, multiple bridge chips are required. The peripheral circuits are complex and the cost of system hardware is high.

[0005] 2. The signal output rate and amplitude of the MIPI bridge chip have been defined inside the chip, which has poor flexibility and cannot meet the requirements of all modules for signal rate and amplitude

[0006] 3. Using the MIPI bridge chip solution, since the read and write length of the module IC register is limited by the length of the FIFO (First Input First Output, first-in-first-out queue) inside the bridge chip, the storage space of the module IC register may not be sufficient. Meet the conditions of reading and writing data length requirements

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