Display Panel Driving Circuit Compensation for Transistor Deterioration
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Solution Overview
Problem
In display devices, deteriorating transistors lead to decreased current flow and altered current-voltage characteristic curves, affecting image quality, and temperature changes further complicate voltage compensation.
Innovation Solution
A display device with a compensation mechanism that senses voltages across multiple pixels to adjust data voltages dynamically, using a sensing mode to gather data for compensating image data based on the state of transistors and temperature, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If transistors are used in display pixels, then the display device can generate and provide images through the pixels, but as usage time increases, the transistors deteriorate and current-voltage characteristic curves change, leading to decreased current flow and degraded display quality
Solution Approach 1:
The patent implements a sensing mechanism where sensing voltages are applied to pixels and the resulting sensing currents are measured. These sensing currents provide feedback information about the transistor state (including deterioration level) to a compensation circuit. The compensation circuit then adjusts the data voltages applied to pixels based on this feedback, thereby maintaining display quality despite transistor aging and usage time increases.
2Device complexity
If the same voltage is applied to transistors, then the circuit operation is simplified, but as transistors deteriorate, the current flowing through them decreases, requiring voltage adjustment to maintain performance
Solution Approach 1:
The patent transitions from a static voltage application approach to a dynamic one. The compensation circuit dynamically adjusts the data voltages applied to pixels based on real-time sensing of transistor characteristics. This dynamic adjustment allows the system to adapt to transistor deterioration while maintaining stable current flow and display performance, resolving the contradiction between circuit simplicity and current stability.
3Reliability
If a sensing mechanism is implemented to compensate for transistor deterioration, then display quality is improved, but the device complexity and number of circuit components increase
Solution Approach 1:
The patent designs the sensing mechanism to serve multiple functions: it senses transistor characteristics for compensation, provides information about pixel state, and enables adaptation to both transistor deterioration and temperature variations. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving improved display quality through comprehensive sensing and compensation.
4Reliability
If data voltages are adjusted to compensate for transistor deterioration, then current flow is maintained, but the compensation must account for temperature variations that also affect current-voltage characteristic curves
Solution Approach 1:
The sensing mechanism provides real-time feedback about the actual transistor state, which includes effects from both deterioration and temperature variations. The compensation circuit uses this feedback to adjust data voltages in a way that compensates for the combined effects of aging and temperature, rather than addressing them separately. This feedback-based approach maintains current flow accuracy while adapting to multiple simultaneous factors affecting transistor characteristics.
Data Source
AI summary
A display device includes a display panel which operates in a sensing mode or an emission mode, and a data driver electrically connected to the display panel. The display panel includes a first pixel, a second pixel, a third pixel, a fourth pixel, a fifth pixel, a sixth pixel, a first scan line, a second scan line, a first data line, the second pixel. The data driver includes a first switch, a second switch, and an analog front end. The sensing mode includes a first period in which a first scan signal is provided to the first scan line and the first switch is turned on, a second period in which the first scan signal is provided to the first scan line and the second switch is turned on, and a third period in which a second scan signal is provided to the second scan line.