Display Off-Time Sensing for Uniformity and Battery Life
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Solution Overview
Problem
Display panel uniformity is negatively impacted by aging effects, and existing non-uniformity sensing methods are affected by content-dependent noise, leading to incomplete and incorrect compensation, especially in battery-powered devices where off-time sensing can reduce battery life.
Innovation Solution
Implementing off-time sensing with two thresholds for battery-powered and externally powered conditions, prioritizing TFT sensing over emissive element sensing, using multiple scans to reduce noise, and predicting compensation during active display states to maintain uniformity without data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-time sensing is performed to improve display uniformity and avoid content-dependent noise, then measurement precision is improved, but use of energy increases due to battery drain
Solution Approach 1:
The patent implements dynamic sensing frequency adjustment based on display usage patterns. The system performs off-time sensing more frequently when the display has been on for extended periods (above first threshold) and less frequently when usage is short (below second threshold), optimizing the balance between measurement precision and energy consumption.
Solution Approach 2:
The system changes the sensing parameters by using different time thresholds (first threshold for extended usage, second threshold for short usage) to control when off-time sensing occurs. This parameter-based control allows the system to adapt sensing frequency to actual display usage patterns, reducing unnecessary sensing operations.
2Measurement precision
If multiple scans are performed to reduce sensing noise and improve measurement accuracy, then measurement precision is improved, but loss of time increases due to extended sensing duration
Solution Approach 1:
The patent implements periodic sensing during off-times rather than continuous sensing. By performing multiple scans during available off-time periods and using frame-based grouping, the system achieves noise reduction through periodic measurements without requiring excessively long continuous sensing durations.
Solution Approach 2:
The system performs preliminary sensing operations during off-times when the display is not in use. By accumulating sensing data across multiple off-time periods and frames, the system prepares compensation data in advance, reducing the need for lengthy sensing operations during active display periods.
3Reliability
If TFT sensing is performed more frequently than emissive element sensing due to faster aging, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent segments the sensing operation into two distinct parts: TFT sensing and emissive element sensing. Each type is sensed at different frequencies based on their respective aging characteristics, with TFT sensing performed more frequently than emissive element sensing. This segmentation allows optimized energy usage for each component type.
Solution Approach 2:
The system applies partial sensing action by performing TFT sensing more frequently than emissive element sensing, matching the differential aging rates. Rather than sensing both components equally, the system applies excessive sensing to TFTs (which age faster) and moderate sensing to emissive elements, optimizing reliability while managing energy consumption.
Data Source
AI summary
Electronic devices and methods for compensating for aging or other effects in a display during a non-transmitting state (off state) of the display. Sensing may include emissive element sensing of the display and/or thin film transistor sensing of the display. Compensating for the effects may preserve or increase a uniformity of transmission of the display.