OLED Driver Circuit Sensing During Display
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Solution Overview
Problem
Conventional OLED display panels cannot perform parameter sensing during display time, which is necessary for maintaining uniformity, especially in long-time applications like digital signage, as existing methods require disabling the display for sensing operations.
Innovation Solution
A display device with M sets of light emitters and (M+1) sets of drivers, where one set of drivers performs sensing while the others drive the emitters, allowing parameter sensing to occur during display time by configuring additional rows of transistor units to perform sensing operations in a time-sharing manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display function is disabled to perform sensing operation, then parameter sensing can be performed, but the display cannot be maintained during sensing
Solution Approach 1:
The display panel is divided into multiple pixel rows, where odd rows perform display function while even rows perform sensing function simultaneously. This spatial segmentation allows both display and sensing to occur concurrently without interfering with each other, resolving the contradiction between maintaining display function and performing parameter sensing.
2Productivity
If sensing operation is performed during display time, then continuous display functionality is maintained, but additional driver sets are required
Solution Approach 1:
The sensing driver is designed to perform dual functions: during odd frame periods it drives odd pixel rows for display, and during even frame periods it drives even pixel rows for sensing. This multi-functionality allows a single driver to handle both display and sensing operations, reducing the need for additional dedicated driver sets while maintaining continuous display functionality.
3Reliability
If conventional sensing method is used, then parameter compensation can be achieved, but display must be disabled during sensing
Solution Approach 1:
The display function continues uninterrupted during sensing operations by using different pixel rows for display and sensing simultaneously. Odd rows display while even rows sense, then they swap roles in the next frame period. This ensures continuous display output without black screens or interruptions, while still achieving parameter compensation through ongoing sensing operations.
Data Source
AI summary
A display device includes M sets of light emitters and (M+1) sets of drivers, wherein M is a positive integer. Each set of the (M+1) sets of drivers is coupled to at least one set of the M sets of light emitters. When a first set of drivers among the (M+1) sets of drivers are configured to perform a sensing operation, M sets of drivers other than the first set of drivers among the (M+1) sets of drivers are configured to drive the M sets of light emitters, respectively.