Liquid Crystal Display Driving Modulated Voltage Acceleration
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Solution Overview
Problem
Liquid crystal display devices have slow response speeds due to inherent viscosity and elasticity of liquid crystals, leading to motion blurring and degradation in picture quality, especially in displaying moving images, as the response time exceeds the frame period.
Innovation Solution
A driving apparatus and method that accelerates liquid crystal response speed by generating a modulated data voltage and mixing it with an analog data voltage, allowing pre-driving with a higher voltage in the first period of a gate pulse and normal driving with an analog data voltage in the second period, without using a separate memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional liquid crystal display device is used without data modulation, then the device structure is simple, but the response speed is slow (20-80ms rising time, 20-30ms falling time) causing motion blurring in moving images
Solution Approach 1:
The patent applies parameter changes by modulating the data voltage applied to liquid crystal cells based on the temporal variation of video signals. Specifically, when the absolute difference between current and previous frame data exceeds a threshold, the data voltage is increased to accelerate liquid crystal response. This dynamic parameter adjustment resolves the contradiction by improving response speed without requiring fundamental structural changes to the display device.
Solution Approach 2:
The patent implements dynamics by introducing a dynamic data modulation mechanism that adapts the driving voltage in real-time based on signal variation. The system continuously monitors the difference between consecutive frame data and adjusts the data voltage accordingly, creating a dynamic response that accelerates liquid crystal switching only when necessary. This resolves the speed-complexity contradiction by making the system adaptive rather than statically complex.
2Speed
If a high-speed driving method with look-up table is used to accelerate liquid crystal response, then the response speed improves, but the device requires additional memory components increasing complexity and cost
Solution Approach 1:
The patent extracts and eliminates the memory component from the high-speed driving system. Instead of using a look-up table stored in memory, the invention directly computes the data modulation by comparing current and previous frame video signals. This extraction of the memory element while preserving the speed enhancement function resolves the contradiction between response speed and device complexity.
Solution Approach 2:
The patent applies self-service by enabling the data driver to autonomously modulate data voltages using real-time comparison of video signal frames. The system serves its own speed enhancement needs through direct computation and dynamic adjustment without external memory assistance. This self-sufficient approach resolves the contradiction by making the system both fast and simple simultaneously.
3Reliability
If data modulation is applied to accelerate liquid crystal response, then motion blurring is reduced, but the manufacturing cost increases due to additional hardware components
Solution Approach 1:
The patent extracts and removes the memory component from the data modulation system, replacing it with direct computational logic in the data driver. This elimination of memory hardware simplifies the manufacturing process and reduces costs while preserving the picture quality improvements achieved through data modulation. The contradiction between reliability and ease of manufacture is resolved by achieving quality enhancement through software/logic rather than additional hardware.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases liquid crystal response speed without memory, preventing picture quality degradation and reducing costs by eliminating the need for memory, thus enhancing display performance and reducing manufacturing costs.
Implementation Method 1
Liquid crystal display devices adjust light transmittance of liquid crystal cells according to a video signal
Implementation Method 2
the inherent viscosity and elasticity of a liquid crystal
Implementation Method 3
the inherent viscosity and elasticity of a liquid crystal
Data Source
AI summary
An apparatus and method for driving a liquid crystal display device are disclosed in which the response speed of the liquid crystal can be increased without using a digital memory. The driving apparatus includes a liquid crystal panel with gate lines and data lines arranged perpendicularly to each other, a gate driver that supplies a gate pulse to the gate lines, and a data driver. The data driver samples an input N-bit digital data signal to generate an analog data voltage, generates a modulated data voltage for acceleration of a response speed of the liquid crystal according to an M-bit data value of the sampled digital data signal, mixes the modulated data voltage with the analog data voltage, and supplies the mixed data voltage to the data lines.