Liquid Crystal Display Driving Circuit Temperature Compensation
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face challenges in reducing fabrication costs and preventing picture quality deterioration due to unfilled pixel cells, especially at low ambient temperatures.
Innovation Solution
An LCD device with a built-in gate circuit and driving integrated circuit on the panel that generates modulated video data in response to ambient temperature, inverting polarity only during specific periods to optimize pixel cell charging and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ambient temperature of liquid crystal panel is low (below −5° C.), then the charging property of pixel cell deteriorates, but picture quality decreases due to unfilled pixel cells
Solution Approach 1:
The patent applies parameter changes by modifying the video signal characteristics (polarity inversion timing and gray scale levels) in response to detected low temperature conditions. The driving integrated circuit detects temperature and adjusts signal parameters to compensate for reduced liquid crystal response, ensuring proper pixel cell charging and preventing picture quality deterioration.
2Ease of operation
If a plurality of data and gate driver integrated circuits and data printed circuit boards are provided, then the liquid crystal panel can be driven, but the size and production cost reduction is limited
Solution Approach 1:
The patent merges multiple separate driving functions into a single integrated circuit. The driving integrated circuit combines the gate driver, data driver, and temperature detection functions that were previously separate components. This integration reduces the number of discrete components, simplifies the overall structure, and lowers production costs while maintaining full driving capability.
Solution Approach 2:
The driving integrated circuit performs multiple functions simultaneously: it drives the gate lines, drives the data lines, detects ambient temperature, and generates appropriate drive signals based on temperature conditions. This multi-functional approach eliminates the need for separate dedicated circuits for each function, reducing device complexity.
3Area of stationary object
If a flexible printed circuit and liquid crystal display device without gate printed circuit board are used, then the panel size is reduced, but power consumption increases
Solution Approach 1:
The patent adjusts signal parameters including polarity inversion timing and gray scale modulation based on temperature detection. This optimization improves charging efficiency at low temperatures, reducing the energy required to achieve proper pixel cell filling and thereby reducing overall power consumption.
Data Source
AI summary
A liquid crystal display (LCD) device and driving method for same is disclosed. The liquid crystal display device included: a plurality of pixel cells formed at pixel regions defined by crossings of a plurality of gate and data lines on a substrate, each pixel cell for displaying one of three colors, wherein the pixel cells are arranged with pixel cells of a single color arranged along the each gate line, and pixel cells of the three colors are alternately arranged along each data line; a gate built-in circuit built on the substrate that sequentially drives the gate lines; and a driving integrated circuit formed on the liquid crystal panel, that drives the gate built-in circuit and that modulates a video signal to be supplied to the data lines in response to an ambient temperature of the liquid crystal panel.