LCD Overdrive Driver Adaptive Calibration
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Solution Overview
Problem
Current LCD display modules face challenges in achieving fast response times for motion pictures and TV signals due to pixel inertia, leading to blurred edges and ghost images, and existing overdrive techniques require complex Look Up Tables (LUTs) that are difficult to implement and logistically challenging, especially for temperature-compensated and framerate-flexible systems.
Innovation Solution
A method and driver for determining a suitable overdrive drive scheme by measuring and adjusting the overdrive transmission level of LCD pixels, allowing for adaptive compensation of temperature and display aging without pre-defined LUTs, using a processor and memory to iteratively find optimal overdrive parameters during device operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overdrive voltage is applied to improve pixel response time, then response time is improved, but overdrive inaccuracy increases due to temperature and aging variations
Solution Approach 1:
The system performs self-calibration by automatically measuring actual pixel transmission levels and adjusting overdrive voltages without requiring external factory measurements or manual intervention. The display module itself generates and stores the calibration data in its internal memory, enabling autonomous adaptation to temperature and aging variations.
Solution Approach 2:
The system implements a feedback mechanism where actual pixel transmission levels are measured during operation, compared against target levels, and used to iteratively adjust overdrive voltages. This closed-loop approach ensures continuous optimization of overdrive accuracy based on real performance data.
2Measurement precision
If factory measurement and LUT storage are used to ensure overdrive accuracy, then overdrive precision is improved, but manufacturing complexity and logistical effort increase
Solution Approach 1:
The patent extracts the LUT measurement capability from the factory environment and relocates it to the display module itself. By implementing measurement functionality directly in the module, the system eliminates the need for complex external measurement equipment and specialized factory procedures, significantly simplifying manufacturing logistics.
Solution Approach 2:
The display module is designed to perform multiple functions: it displays images, measures its own transmission levels, calculates overdrive voltages, and stores calibration data. This multi-functionality eliminates the need for separate measurement and calibration equipment, reducing manufacturing complexity while maintaining measurement precision.
3Reliability
If temperature compensation is implemented to maintain overdrive accuracy, then overdrive reliability is improved, but system complexity and cost increase
Solution Approach 1:
The system performs self-calibration by automatically measuring actual pixel transmission levels and adjusting overdrive voltages without requiring external factory measurements or manual intervention. The display module itself generates and stores the calibration data in its internal memory, enabling autonomous adaptation to temperature and aging variations.
Solution Approach 2:
Instead of using fixed temperature compensation tables, the system dynamically adapts overdrive voltages based on actual measured performance. The LUT is continuously updated through iterative measurements and adjustments, allowing the system to adapt to changing temperature conditions and aging effects without requiring complex pre-defined compensation schemes.
Data Source
AI summary
A method of providing an LCD overdrive drive scheme, which comprises measuring a stabilized transmission level of an LCD display pixel corresponding to a target drive level. An overdrive transmission level is measured corresponding to an overdrive drive level. The measured overdrive transmission level is compared with the measured stabilized transmission level to determine if the overdrive drive level is too high or too low. An iterative process then changes the overdrive drive level until a suitable overdrive drive level is found. This is used to derive overdrive drive scheme parameters which are stored in a memory of the LCD device. This method enables an overdrive scheme to be determined during use of the device. It can therefore take account of temperature and display ageing, without the effects of these being modeled.