LCD Driving System Pin Map Compatibility for Contrast Ratio
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Solution Overview
Problem
Existing liquid crystal display (LCD) driving systems face challenges in improving contrast ratio and reducing power consumption while maintaining compatibility with existing pin maps, requiring additional pins and pin map changes.
Innovation Solution
A driving system for LCDs that includes a system unit to generate dimming signals, an inverter unit to control backlight luminance, and a control unit to manage image display, allowing for operation in both normal and advanced modes without altering the existing pin map, by using a system dimming signal to adjust backlight luminance through a control dimming signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional pins and pin map changes are made to enable advanced contrast ratio improvement mode, then contrast ratio and power consumption performance are improved, but device complexity and compatibility are worsened
Solution Approach 1:
The existing pin is made multi-functional by enabling it to serve both as a normal mode signal and an advanced mode enable signal. The control unit determines the signal type based on voltage level (0.8V threshold), allowing a single pin to handle multiple functions without requiring additional pins or changing the pin map.
Solution Approach 2:
The patent uses parameter changes in voltage levels to distinguish between normal mode and advanced mode operations. By monitoring whether the voltage on the existing pin exceeds 0.8V, the system can switch between operational modes without physical hardware changes, thereby improving contrast ratio performance while maintaining pin map simplicity.
2Adaptability or versatility
If additional pins are added to transmit control signals for advanced mode, then contrast ratio improvement capability is enhanced, but ease of operation and compatibility are reduced
Solution Approach 1:
The existing pin is made multi-functional by enabling it to serve both as a normal mode signal and an advanced mode enable signal. The control unit determines the signal type based on voltage level (0.8V threshold), allowing a single pin to handle multiple functions without requiring additional pins or changing the pin map.
Solution Approach 2:
The system automatically detects the operational mode by monitoring the voltage level on the existing pin without requiring external intervention or configuration changes. The control unit self-determines whether to operate in normal or advanced mode based on the voltage threshold, maintaining ease of operation while enabling advanced functionality.
Data Source
AI summary
A driving system for a liquid crystal display device includes a system unit to supply image data to be displayed on a liquid crystal panel, the system unit generating a system dimming signal, an inverter unit to control luminance of a backlight unit, the inverter unit receiving the system dimming signal, and a control unit to control display of images on the liquid crystal panel, the control unit receiving the system dimming signal from the inverter unit and outputting a control dimming signal to the inverter unit, wherein the inverter unit adjusts luminance of the backlight unit using the control dimming signal input from the control unit.