Data Driving Circuit Subpixel Sensing Switches
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Solution Overview
Problem
As organic light emitting display devices deteriorate over time, accurate control of subpixel driving becomes increasingly difficult, leading to reduced image quality.
Innovation Solution
A data driving circuit is implemented with a plurality of sensing switches, a sensing capacitor, and a sampling switch, which detects the characteristic value of subpixels through reference voltage lines, allowing for accurate compensation for deterioration and reduced detection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large sensing circuit is used to detect circuit element deterioration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Multiple sensing switches share a common sensing capacitor, merging multiple detection functions into a single circuit structure. This allows the system to detect deterioration of multiple circuit elements using fewer discrete components, thereby reducing overall device complexity while maintaining measurement precision through multi-point sensing capability.
Solution Approach 2:
The sensing capacitor serves multiple functions by being connected to multiple sensing switches that monitor different circuit elements. This universal component performs repeated measurements at different time points, enabling the system to track deterioration progression without requiring separate dedicated sensing circuits for each circuit element.
2Measurement precision
If a long sensing period is used to detect circuit element deterioration, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The sensing switches operate in periodic cycles, alternating between sensing periods and non-sensing periods. During sensing periods, the sensing capacitor measures voltage levels to detect deterioration. This periodic operation allows the system to achieve measurement precision through multiple samples while reducing total detection time compared to continuous monitoring, as the capacitor can be reused across periods.
Solution Approach 2:
The sensing capacitor maintains its charge and measurement capability continuously across multiple sensing periods. By keeping the capacitor charged and ready for repeated measurements without requiring re-initialization or re-charging between detections, the system achieves continuous useful action that improves measurement precision while minimizing time loss between successive measurements.
3Productivity
If multiple sensing switches are used simultaneously, then productivity is improved, but device complexity increases
Solution Approach 1:
Multiple sensing switches are merged into a single sensing group that shares a common sensing capacitor. This configuration allows simultaneous or near-simultaneous operation of multiple switches to detect different circuit elements without requiring separate sensing circuits for each switch, thereby improving detection speed (productivity) while controlling device complexity through component sharing.
Solution Approach 2:
The sensing capacitor is pre-charged to a reference voltage level before the sensing period begins. This preliminary action ensures that the capacitor is ready for immediate measurement when the sensing switches are activated, enabling rapid sequential or simultaneous detection of multiple circuit elements without introducing additional time delays or complexity in the switching control logic.
Data Source
AI summary
Two or more sensing switches are included in a sensing unit for detecting a characteristic value of a subpixel, and are electrically coupled to a reference voltage line. The two or more sensing switches share a sampling switch with a sensing capacitor included in the sensing unit, which reduces size of the sensing unit. Sensing may include driving simultaneously two or more sensing switches sharing a sensing capacitor, or sensing may be performed through continuous and short driving after simultaneous driving. Overall sensing time can be reduced and sensing accuracy improved.