LCD graphical display controller and control method

Abstract

The invention discloses a liquid crystal graphical display controller and a control method. The controller comprises an FPGA module, a video memory module, a storage module for character resources, an external device control bus hut and a TFT-LCD socket, and is characterized in that: the FPGA module includes bidirectional communication data connection between an external bus extended interface and the external device control bus hut, thus realizing the interaction with an external control device; a display output control signal of the FPGA module is connected with the TFT-LCD socket to realize the control of the TFT-LCD display; a display data signal of the FPGA module is both-way connected with the video memory module to realize read-write operation for the displayed content; and a character data signal of the FPGA module is both-way connected with the storage module for character resources to realize the read control of the storage module for character resources.

Description

technical field [0001] The invention relates to a liquid crystal graphic display controller and a control method. Background technique [0002] Due to its ultra-thin size, high brightness and high definition, TFT-LCD liquid crystal display is widely used in industrial equipment to realize graphical interface display and human-computer interaction functions. The existing TFT-LCD display control solutions mainly include: 1) Use a dedicated LCD controller chip. Such as LR38820 of Japan's Sharp Corporation (SHARP), and S1D13774 of Japan's Epson Corporation (EPSON). These chips can support various types of TFT-LCD display functions, and also provide rich microcontroller interfaces. However, these chips are mainly used for CPUs with more than 16 bits, and the setting and programming are more complicated. Especially in terms of graphic functions, such as realizing the superposition of graphics and switching between different graphics, it is relatively lacking. It is also constr...

AI Technical Summary

Problems solved by technology

However, these chips are mainly used for CPUs above 16 bits, and the setting and programming are more complicated

Especially in terms of graphic functions, such as realizing the superposition of graphics and switching between different graphics, it is relatively lacking

At the same time, it is constrained by hardware packaging, size and cost

2) Use a SOC chip with a liquid crystal display controller, such as the S3C2410 ARM chip of South Korea's Samsung (SUMSANG). Although this type of chip has a high degree of integration and rich functions, it supports fewer types of interfaces for LCD screens, and causes damage to the LCD screen. A lot of waste of other resources in the chip increases the system cost

Although the PC can support a large number of TFT-LCD output, the cost of the PC is too high and the size is too large, so it can only be used in a few occasions and cannot be used as an embedded device.

[0003] And the above-mentioned TFT-LCD display control solution, when displaying graphics, the display of each point needs to be realized through CPU operation, so the speed of graphic display is severely limited by the operating speed and efficiency of the CPU. In addition, graphics overlay and screen When protecting, it needs to use a large amount of system memory as a cache to complete, which is not available for most single-chip microcomputers and DSPs

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