Liquid Crystal Display Voltage Modulation for Power Reduction
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Solution Overview
Problem
Liquid crystal display devices (LCDs) face challenges in reducing power consumption, particularly when displaying patterns that require higher voltage levels, leading to increased power consumption and heat emission.
Innovation Solution
The implementation of a power supply unit that generates gamma and modulation voltages, with a timing controller analyzing image data to sense target patterns and adjust voltage differences to minimize power consumption by switching between higher and lower voltage levels when necessary, thereby reducing the difference between voltage levels and decreasing overall power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher voltage levels are used to display patterns requiring maximum gray level, then image brightness is maintained, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the voltage level adaptive rather than static. The driving voltage is dynamically adjusted based on the content being displayed - using higher voltage (first driving voltage) when maximum gray level is required and lower voltage (second driving voltage) when maximum gray level is not required. This dynamic adjustment resolves the contradiction by maintaining brightness only when necessary while reducing power consumption during normal operation.
Solution Approach 2:
The patent changes the voltage parameter based on display content requirements. By switching between two different driving voltage levels (first driving voltage and second driving voltage) depending on whether the target pattern requires maximum gray level, the system optimizes the balance between image brightness and power consumption. This parameter change approach allows the system to adapt to different display scenarios.
2Illumination intensity
If higher voltage levels are used to maintain image brightness, then display quality is preserved, but heat emission increases
Solution Approach 1:
The dynamic voltage adjustment mechanism resolves this contradiction by applying higher voltage only when image brightness is required (when target pattern requires maximum gray level). During normal display operations, the lower voltage reduces heat generation while maintaining adequate brightness. This dynamic approach prevents continuous heat generation associated with always using high voltage levels.
Solution Approach 2:
By changing the driving voltage parameter between two levels based on display content, the system controls heat emission. The lower second driving voltage is used to reduce heat generation during normal operation, while the higher first driving voltage is temporarily applied only when brightness requirements demand it, thus managing the temperature-brightness tradeoff.
Data Source
AI summary
A liquid crystal display device according to the present disclosure includes a timing controller, a power supply unit, a data supply unit, and a liquid crystal display panel. The timing controller analyzes image data to sense a target pattern, and generates an operating signal in a case where the target pattern is sensed. The power supply unit generates first to fourth gamma voltages in a case where the operating signal is not received. The power supply unit generates first to fourth modulation voltages after a variable time in a case where the operating signal is received. The difference between the first and second modulation voltages is smaller than the difference between the first and second gamma voltages, and the difference between the third and fourth modulation voltages is smaller than the difference between the third and fourth gamma voltages.