Display Panel Driving Transistor Sensing for Brightness Uniformity
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Solution Overview
Problem
Display panels with OLED or QLED technology face issues in brightness uniformity due to differences in electrical characteristic parameters of driving transistors, leading to inconsistent display brightness, which existing compensation methods struggle to fully address.
Innovation Solution
A method for sensing and compensating the electrical characteristic parameters of driving transistors in display panels involves generating random sensing sequences using a Randperm function to determine which rows to sense during blank stages between frames, utilizing a sensing driving circuit to generate pulse signals for sensing clock, starting, and enable control signals to assess the transistors, and resetting the circuit to ensure accurate compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If real-time sensing is performed in the blank stage between frames, then brightness uniformity is improved, but horizontal dark lines become visible and user experience deteriorates
Solution Approach 1:
The patent performs sensing operations in advance during the blank stage between frames, before the next display frame is rendered. By completing the sensing of electrical characteristic parameters beforehand and using predictive algorithms to calculate compensation values, the system avoids performing sensing operations during active display periods, thus preventing horizontal dark lines while maintaining brightness uniformity through pre-computed corrections.
Solution Approach 2:
The patent introduces a predictive algorithm as an intermediary between the sensing operation and the compensation application. This algorithm predicts the electrical characteristic parameters based on historical data and calculates compensation values without requiring real-time sensing during display. The predictive model acts as a mediator that decouples the sensing operation from the display timing, eliminating horizontal dark lines while achieving compensation.
2Measurement precision
If sensing operations are performed during active display stages, then measurement accuracy is improved, but display continuity is disrupted and productivity decreases
Solution Approach 1:
The patent segments the sensing operation into discrete sensing periods that occur only during blank stages between frames, separating it from the active display periods. This segmentation allows the sensing circuit to operate independently during non-display intervals, ensuring accurate measurement of electrical characteristic parameters without interrupting the continuous display refresh cycle, thereby maintaining both measurement precision and display productivity.
Solution Approach 2:
The patent implements periodic sensing operations that occur at regular intervals during blank stages between frames. Instead of continuous sensing that would disrupt display, the system performs sensing periodically only when the display is not actively refreshing. This periodic approach ensures adequate measurement accuracy while maintaining continuous display operation and preserving frame rate productivity.
3Manufacturing precision
If compensation is applied to all rows sequentially, then manufacturing precision is improved, but time consumption increases and productivity decreases
Solution Approach 1:
The patent applies compensation to a selected subset of rows rather than all rows uniformly. By using predictive algorithms to identify which rows require compensation based on historical data and patterns, the system performs compensation only where necessary. This partial action approach maintains brightness uniformity in affected areas while significantly reducing the total time required for sensing and compensation operations compared to processing all rows.
Solution Approach 2:
The patent changes the parameter of compensation application from universal to selective based on predicted needs. By dynamically adjusting which rows receive compensation based on electrical characteristic parameter predictions and historical sensing data, the system optimizes the balance between achieving brightness uniformity and minimizing time consumption. This parameter change enables targeted compensation that reduces overall processing time while maintaining display quality.
Data Source
AI summary
A method for sensing a display panel includes: sensing an electrical characteristic parameter of a driving transistor of a pixel circuit of a sub-pixel in an X-th row in a blank stage between an N-th frame and an (N+1)-th frame, wherein X is a random number, and both N and X are positive integers.