DC-DC Converter Temperature Compensation for LCD Charging
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses experience deteriorated display quality at low temperatures due to decreased charging rates of switching elements in gate lines drivers, leading to delayed pixel voltages and suboptimal image display.
Innovation Solution
A DC-DC converter with a temperature-compensating part that generates different ON voltages based on ambient temperature, using charge sharing resistors to produce temperature-adjusted clock signals, ensuring proper charging of pixel voltages across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC-DC converter operates at low temperatures, then power conversion function is maintained, but charging rate of switching elements decreases leading to delayed pixel voltages
Solution Approach 1:
The patent changes the clock signal parameters (frequency and/or voltage level) based on detected temperature conditions. When low temperature is detected, the clock signal frequency is increased or voltage level is adjusted to compensate for the decreased charging rate of switching elements, thereby maintaining display quality across different operating temperatures.
2Reliability
If temperature-compensating measures are implemented, then display quality at low temperatures is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic temperature compensation by detecting the operating temperature and dynamically adjusting the clock signal parameters accordingly. The converter switches between different clock signal configurations based on temperature thresholds, enabling adaptive optimization without requiring completely separate hardware circuits for different temperature ranges.
Data Source
AI summary
A method of differently producing driving clock signals for a shift register of a gate lines driving circuit of a Liquid Crystal Display (LCD), the method includes the steps of determining whether an ambient temperature is greater than or not in comparison to a predetermined threshold temperature; in response to the determining indicating that the ambient temperature is greater, using a first ON voltage and a first charge canceling method; and in response to the determining indicating that the ambient temperature is not greater, using a second ON voltage and a second charge canceling method, where the second ON voltage is different from the first ON voltage and where the second charge canceling method is different from the first charge canceling method. The second charge canceling method may have a shorter duration than that of the first charge canceling method. The second ON voltage may be greater than the first ON voltage.