Display Device Moisture Compensation via Timing Controller
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Solution Overview
Problem
Moisture permeation in organic light emitting display devices can alter the sensing value of threshold voltage, leading to errors in data compensation, which affects image quality and accuracy.
Innovation Solution
A display device with a timing controller that outputs a sensing pulse and compares delay pulses to identify defects in source integrated circuits due to moisture permeation, allowing for compensation of video data signals to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If threshold voltage sensing is performed to compensate for data, then image quality is improved, but sensing accuracy deteriorates due to moisture permeation
Solution Approach 1:
The display panel is divided into multiple independent sensing regions, each with its own sensing line connected to different source integrated circuits. This segmentation allows independent monitoring of moisture permeation in different areas, enabling localized compensation without affecting the entire display.
Solution Approach 2:
Sensing lines are introduced as intermediary elements between the moisture environment and the source integrated circuits. These sensing lines detect timing changes caused by moisture permeation and transmit this information to the timing controller, which then adjusts the data signal accordingly.
2Adaptability or versatility
If sensing operation is added to detect threshold voltage, then data compensation capability is improved, but device complexity increases
Solution Approach 1:
The sensing lines serve multiple functions: they act as data transmission lines during normal operation and as sensing lines for moisture detection during compensation operations. This multi-functionality reduces the need for separate dedicated sensing circuits, thereby limiting the increase in device complexity.
Solution Approach 2:
The existing source integrated circuits and timing controller perform the sensing operation without requiring additional dedicated sensing hardware. The timing controller utilizes its existing pulse generation and timing comparison capabilities to execute the sensing function, making the system self-sufficient.
3Measurement precision
If multiple sensing lines are disposed to monitor moisture permeation, then measurement coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The sensing lines are merged with the existing data line structure of the display device. By utilizing the same physical routing and connection methods as the data lines, the sensing lines can be manufactured simultaneously without requiring separate manufacturing processes, thereby reducing manufacturing complexity.
Data Source
AI summary
A display device includes a display panel in which a plurality of pixels is disposed, a timing controller configured to output a sensing pulse and a video data signal, and a data driver configured to apply sensing pulse and outputs a data voltage to the plurality of pixels according to the video data signal, in which the data driver includes a plurality of source integrated circuits, each of the plurality of source integrated circuits receives a plurality of delay pulses, and the timing controller compares timings of the plurality of delay pulses and compensate for the video data signal.