LCD Response Speed via Transient Frame Insertion
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Solution Overview
Problem
Liquid crystal display (LCD) devices have inferior response speed compared to cathode ray tube (CRT) displays due to the delay properties of liquid molecules, leading to blurs and residuals in dynamic images, necessitating methods to enhance response speed.
Innovation Solution
The method increases the output frame rate by generating additional transient frames and applying overdriving or black-insertion techniques, integrating these with existing acceleration methods to enhance the dynamic display effect and simulate impulse-typed display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LCD driving methods are used, then the device structure remains simple and energy consumption is low, but the response speed is slow causing image blurs and residuals
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal overdriving voltage values in lookup tables before operation. The control circuit retrieves pre-computed voltage values based on current and target gray levels, avoiding real-time complex calculations. This enables faster response speed through pre-prepared acceleration voltages while keeping the control circuit relatively simple.
Solution Approach 2:
The patent changes the voltage parameter by applying overdriving voltages that exceed the standard driving voltages. By dynamically adjusting voltage levels based on gray level transitions, the liquid crystal molecules are driven to reach target states faster. This parameter change approach directly improves response speed without fundamentally altering the display device structure.
2Speed
If overdriving voltage is applied to accelerate response, then response speed improves, but energy consumption increases
Solution Approach 1:
The patent applies local quality by selectively applying overdriving voltages only to pixels that require gray level transitions, rather than uniformly increasing voltage across the entire display. The control circuit determines which pixels need acceleration based on frame differences, applying higher voltages only where necessary. This localized approach improves response speed for dynamic content while minimizing overall energy consumption.
Solution Approach 2:
The patent uses partial action by applying overdriving voltages only during specific conditions (gray level transitions) rather than continuously. The system applies excessive voltage temporarily to accelerate molecular response, then returns to normal driving voltages. This partial application of excessive action achieves speed improvement while limiting energy consumption to only when needed.
3Speed
If frame rate is increased to reduce motion blur, then dynamic display quality improves, but processing complexity and power consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating overdriving voltage values and storing them in lookup tables organized by gray level transitions. When a frame needs to be displayed, the control circuit simply retrieves the appropriate pre-computed voltage values based on current and target gray levels, avoiding complex real-time calculations. This enables high frame rate operation with reduced processing complexity.
Solution Approach 2:
The patent applies dynamics by making the driving voltage adaptive rather than static. The control circuit dynamically selects voltage levels based on the specific gray level transitions occurring in each frame. This dynamic adjustment allows the system to optimize response speed for each pixel individually while maintaining overall system efficiency, enabling higher effective frame rates without proportional increases in processing complexity.
Data Source
AI summary
The method increases the output frame rate to p/q (p, q are both natural numbers and p>q) times of the input frame rate. In a period of time equal to the least common multiple of the input and output frame times, q input frames are output and (p−q) transient frames are generated and inserted at appropriate places before or after the q input frames in the output frame sequence so as to enhance the dynamic display effect of the display device.