Display Device Sub Pixel Sensing Circuit
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Solution Overview
Problem
Existing display devices face issues with luminance deviation between sub pixels due to differences in degradation, leading to inaccurate luminance expressiveness and screen abnormalities.
Innovation Solution
A display device is designed with a sensing transistor that senses the characteristic values of sub pixels, using a reference voltage line system to improve sensing speed and precision, allowing for more accurate compensation of data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing transistor is added to sense characteristic values of sub pixels, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing transistor shares the same gate line with the display transistor, allowing a single gate line to serve both display and sensing functions. This multi-functionality approach adds sensing capability without requiring separate control lines, thereby improving measurement precision while minimizing the increase in device complexity
Solution Approach 2:
A sensing electrode is introduced as an intermediary element that enables the sensing function by detecting voltage changes at the source electrode of the display transistor. This intermediary structure allows characteristic value sensing without directly modifying the core display transistor architecture, thus improving sensing precision with minimal impact on device complexity
2Measurement precision
If reference voltage lines are used for sensing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The display panel is divided into multiple sensing regions, each with its own reference voltage line. This segmentation allows independent sensing of different sub pixel groups (first through fourth sub pixels) with dedicated reference lines, improving measurement precision for each region while managing overall line complexity through organized segmentation
Solution Approach 2:
Reference voltage lines are used to establish equipotential regions during sensing operations, ensuring that voltage measurements are taken against a stable reference potential. This equipotential approach improves sensing accuracy by eliminating potential drift errors, while the reference lines are designed to minimize interference with the display signal paths
3Manufacturing precision
If sub data lines are used to connect sub pixels of the same color, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Different data line configurations are applied to different color sub pixels based on their specific sensing requirements. For example, first sub pixels use one configuration while second sub pixels use another, allowing optimized local connections for each color type. This local quality approach improves manufacturing precision by enabling color-specific optimization while managing overall data line complexity through systematic variation rather than complete redesign
Data Source
AI summary
A display device can include a display panel in which a plurality of pixel units including a first pixel and a second pixel are disposed in a row, a data driver configured to supply a data voltage to the plurality of pixel units through a plurality of data lines using a sensing result of the plurality of pixel units by a first reference voltage line and a second reference voltage line, and a gate driver configured to supply a gate signal to the plurality of pixel units through a first gate line and a second gate line. Each of the first pixel and the second pixel can include N sub pixels each having a different color, where N is a natural number larger than 1.