LCD Signal Processing Device Motion Interpolation DCC Over-Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) experience blurring and slow response times when displaying moving images due to the slow response speed of liquid crystals, which can lead to errors in brightness levels and excessive compensation voltages being applied, resulting in unwanted brightness perception.
Innovation Solution
A signal processing device with a motion interpolator, look-up tables, and a data compensator is used to calculate motion vectors, generate intermediate image data, and apply compensation voltages to improve response characteristics, reducing blurring and over-compensation by inserting intermediate frames and adjusting gray scale values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dynamic capacitance compensation (DCC) scheme is applied to compensate for slow liquid crystal response speed, then response speed is improved, but over-compensation occurs resulting in excessive brightness levels and visual errors
Solution Approach 1:
The motion interpolator performs preliminary action by generating intermediate image data between previous and current frames before the DCC compensation is applied. This preliminary interpolation provides the DCC circuit with more accurate reference data, enabling it to calculate appropriate compensation voltages without over-compensating, thus resolving the brightness accuracy issue while maintaining improved response speed.
2Loss of time
If over-driven compensation voltage is applied to achieve target brightness within one frame, then response time is reduced, but errors in crystal state accumulate producing excessive brightness levels
Solution Approach 1:
The system implements feedback by using the motion interpolator to continuously analyze the relationship between previous, current, and intermediate frame data. This feedback mechanism allows the DCC circuit to adjust compensation voltages dynamically based on actual liquid crystal response patterns, preventing error accumulation and excessive brightness while maintaining fast response times.
3Speed
If motion interpolation is used to generate intermediate frames, then apparent response speed is improved, but device complexity increases due to additional processing components
Solution Approach 1:
The motion interpolator is designed with multi-functionality, serving both as a motion compensation device and as a source of interpolated image data for the DCC circuit. By integrating these functions into a single component, the system achieves improved apparent response speed without proportionally increasing device complexity, as the same hardware structure performs multiple critical functions.
Data Source
AI summary
A liquid crystal display system including a signal processing device uses interpolation to generate an intermediate image frame using previous image frame data and present image frame data. The system converts data of the intermediate image frame into transposed image data that is to be used to drive a liquid crystal display panel and display a corresponding image. The transposed image data and the present image data are subjected to a prespecified DCC process (dynamic capacitance compensation process) to thereby generate respective first and second compensation image data. Since the first compensation image data is generated based on the transposed image data and the transposition is configured to prevent over-compensation by the DCC process, over-compensation by the dynamic capacitance compensation process can be reduced or prevented.