LED Driver Reference Voltage Reduces Cross Talk
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Solution Overview
Problem
Electronic displays using LED drivers face issues with cross talk and flicker due to differences in driving voltages among color illuminators, leading to distortions and artifacts such as banding and gamma smoothness issues.
Innovation Solution
Applying a reference voltage to the LED driver prior to applying the driving voltage helps reduce cross talk by stabilizing the driving current, thereby improving the transient performance of the LED driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If different driving voltages are applied to different color LEDs to save power and maintain stable driving current, then power efficiency and current stability are improved, but cross talk occurs between color illuminators causing flicker and banding artifacts
Solution Approach 1:
The patent applies preliminary action by setting the common electrode voltage to a reference voltage level before activating each color LED. This pre-positioning of the voltage reduces the voltage transition magnitude when switching between colors, thereby minimizing cross talk effects while maintaining power efficiency benefits of differential voltage driving
2Stability of the object's composition
If different driving voltages are applied to different color LEDs to maintain stable driving current, then current stability is improved, but transient performance deteriorates due to cross talk causing longer rise/decline time and settling time
Solution Approach 1:
By pre-setting the common electrode to an appropriate reference voltage before LED activation, the system reduces the voltage transition magnitude required during color switching. This preliminary voltage positioning enables faster current rise and settling while maintaining stable driving current, thus improving transient response without sacrificing current stability
3Device complexity
If common electrode voltage is held constant to simplify driving, then device complexity is reduced, but cross talk occurs affecting gamma smoothness and display quality
Solution Approach 1:
The patent implements dynamic control of the common electrode voltage by adjusting it to different reference voltage levels depending on which color LED is being activated. This dynamic voltage adjustment approach maintains relatively simple circuit architecture while eliminating cross talk effects and preserving gamma smoothness, achieving a balance between complexity and display quality
Data Source
AI summary
Systems and methods for electronic displays to use reference voltages to control driving current of illuminators are provided. The reference voltages are used to reduce or eliminate cross talk in driving voltages among different illuminators and driving voltage variations from frame to frame. The transient performance of the driving current of the illuminator (e.g., the current rise/decline time, current overshoot issue, current settling time) may be improved by implementing the reference voltages.