Display Pixel Vreset and VSSEL Tuning for Temperature-Stable Gray Levels
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Solution Overview
Problem
Electronic displays face challenges in accurately depicting gray levels due to ambient conditions such as temperature changes, leading to inconsistent pixel illumination and increased power consumption.
Innovation Solution
A control circuit dynamically adjusts the source supply voltage (VSSEL) and reset voltage (Vreset) to compensate for ambient conditions, using a lookup table to store optimized voltage values for different conditions, thereby improving gray level accuracy and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed voltage values are used for VSSEL and Vreset, then device complexity is reduced, but gray level accuracy deteriorates under varying ambient conditions
Solution Approach 1:
The patent implements dynamic voltage adjustment by transitioning from fixed voltage values to time-varying voltage signals for VSSEL and Vreset. The control circuit modifies these voltages based on detected ambient conditions (temperature, humidity) to maintain accurate gray level representation across different environmental states, directly resolving the contradiction between fixed simplicity and dynamic accuracy.
Solution Approach 2:
The patent changes the voltage parameters of VSSEL and Vreset dynamically in response to ambient condition variations. By adjusting voltage magnitude and timing based on temperature and humidity sensors, the system maintains optimal gray level accuracy without requiring complete redesign of the display circuitry, balancing accuracy improvement with acceptable complexity increase.
2Measurement precision
If higher voltages are applied to compensate for temperature changes, then gray level accuracy is maintained, but power consumption increases
Solution Approach 1:
The system dynamically adjusts voltage levels based on real-time ambient condition detection rather than applying constant high voltages. The control circuit modulates VSSEL and Vreset voltages to the minimum necessary levels required to maintain gray level accuracy under current environmental conditions, thereby reducing unnecessary power consumption while preserving display quality.
Solution Approach 2:
The patent implements adaptive voltage parameter changes that respond to ambient conditions. By modifying voltage magnitude and timing parameters dynamically, the system achieves the minimum effective voltage required for accurate gray level representation under varying temperatures and humidity, optimizing the balance between accuracy maintenance and power consumption reduction.
3Use of energy by moving object
If dynamic voltage tuning is implemented, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a control circuit as an intermediary component that manages the complexity of dynamic voltage tuning. This intermediary layer receives ambient condition inputs, processes the information, and generates appropriate voltage adjustment signals for VSSEL and Vreset, isolating the complexity from the core display pixel structures and making the system more manageable and maintainable.
Solution Approach 2:
The control circuit serves multiple functions: it monitors ambient conditions (temperature, humidity), processes sensor data, generates dynamic voltage adjustment signals, and coordinates with the display driver circuitry. By consolidating these diverse functions into a single multi-functional control unit, the patent manages device complexity while achieving power consumption reduction through dynamic voltage tuning.
4Stability of the object's composition
If ambient conditions are not compensated, then device complexity remains low, but image quality deteriorates with temperature variations
Solution Approach 1:
The patent implements feedback mechanisms where ambient condition sensors continuously monitor temperature and humidity, and this information feeds back to the control circuit which adjusts VSSEL and Vreset voltages accordingly. This closed-loop feedback system maintains image consistency by automatically compensating for environmental variations, resolving the contradiction between simplicity and stability.
Solution Approach 2:
The display system performs self-adjustment by using its own ambient condition sensors to detect environmental changes and automatically modifying its voltage parameters through the control circuit. This self-service capability maintains image consistency without requiring external calibration or manual intervention, achieving stability enhancement with acceptable complexity increase.
Data Source
AI summary
A control circuit adjusts a value of a source supply voltage VSSEL provided to a display area in an electronic display. The control circuit also adjusts a voltage Vreset applied to the display area to cause the display area to emit light more uniformly under various ambient conditions (e.g., temperature) surrounding the display area. Dynamically changing Vreset is employed to make anode charging dynamics independent of temperature. The control circuit adjusts the source supply voltage VSSEL and the voltage Vreset together to compensate display pixel hysteresis effects and display artifacts caused by temperature changes and brightness changes of the display area and collectively produce images. Dynamically tuning the Vreset and the VSSEL voltages also saves power and improves gray level accuracy for the electronic display.