Display Device Sensing Part Voltage Drop Compensation
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Solution Overview
Problem
Display devices face challenges in accurately sensing and correcting threshold voltages at each pixel due to voltage drops caused by wire resistance in data and receiving lines, leading to performance issues in image display.
Innovation Solution
A display device and driving method that include a sensing part to detect voltage drops in data and receiving lines, calculate offset voltages to compensate for these drops, and adjust the threshold voltage for each pixel, thereby improving the accuracy of image data generation and supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage sensing is performed through data lines and receiving lines, then threshold voltage can be sensed at each pixel, but voltage drops caused by wire resistance lead to sensing errors
Solution Approach 1:
The patent introduces receiving lines as intermediary pathways that are electrically connected to pixel electrodes but electrically isolated from data lines through switching elements. These receiving lines serve as dedicated sensing pathways that can carry sensing signals without being affected by data signal transmissions, thereby eliminating the voltage drop errors that occur when using data lines for both data transmission and voltage sensing.
Solution Approach 2:
The patent segments the electrical pathways by separating data transmission functions (through data lines) from voltage sensing functions (through receiving lines). This segmentation allows each pathway to be optimized for its specific function, with receiving lines dedicated solely to sensing operations, thereby eliminating the interference and voltage drop errors that occur when data lines are used for dual purposes.
2Measurement precision
If receiving lines are added to sense pixel characteristics, then mobility and threshold voltage can be measured, but device complexity increases
Solution Approach 1:
The receiving lines are designed to serve multiple functions: they can be used for threshold voltage sensing, mobility measurement, and deterioration characteristic detection. By creating a single sensing infrastructure that handles multiple measurement tasks, the patent avoids the need for separate dedicated pathways for each type of measurement, thereby reducing overall device complexity while maintaining comprehensive sensing capability.
Solution Approach 2:
The patent combines the sensing of multiple pixel characteristics (threshold voltage, mobility, deterioration) into a unified sensing system using the receiving lines. Instead of implementing separate sensing mechanisms for each characteristic, the receiving lines provide a common pathway that can extract multiple types of information, thereby reducing the number of separate components and simplifying the overall device architecture.
Data Source
AI summary
A display device includes: a display panel including pixels; a scan driver which supplies a scan signal to scan lines connected to the pixels and supplies a sensing signal to sensing lines connected to the pixels; a data driver which supplies a data signal corresponding to image data to data lines connected to the pixels; a sensing part which senses a threshold voltage of a first transistor included in each of the pixels through receiving lines connected to the pixels, and corrects the sensed threshold voltage based on a voltage drop corresponding to at least one of an internal resistance of the data lines and an internal resistance of the receiving lines; and a timing controller which generates the image data by changing input image data based on the corrected threshold voltage.