Display Device Timing Control for Transistor Sensing Accuracy
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Solution Overview
Problem
Organic light-emitting display devices face issues with luminance deviations due to transistor characteristic deviations, which are exacerbated by black data insertion for improving motion picture response time, leading to sensing errors and image quality degradation.
Innovation Solution
A display device and method that sense and compensate for transistor characteristic deviations by separating real-time sensing and recovery periods, ensuring black data is inserted outside sensing periods to prevent overlap and accurately determine compensation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If black data is inserted into the display period to improve motion picture response time, then MPRT is improved, but sensing accuracy of transistor characteristics deteriorates due to overlap with sensing period
Solution Approach 1:
The patent segments the display period into distinct sensing period and non-sensing period by inserting black data into specific subpixel regions. This temporal and spatial segmentation allows the sensing operation to be performed in dedicated time slots without interference from black data insertion, thereby maintaining sensing accuracy while still achieving MPRT improvement through controlled black data placement in other regions.
2Speed
If black data is inserted to improve MPRT, then motion picture response time is improved, but luminance uniformity deteriorates due to transistor characteristic deviations
Solution Approach 1:
The patent implements a feedback mechanism where transistor characteristics are sensed during dedicated sensing periods (separated from black data insertion), and compensation values are calculated based on sensed deviations. These compensation values are then applied to correct luminance non-uniformity caused by transistor characteristic variations, thereby maintaining luminance uniformity while allowing black data insertion for MPRT improvement.
3Measurement precision
If sensing period and black data insertion are separated, then sensing accuracy is improved, but device complexity increases due to additional timing control
Solution Approach 1:
The patent achieves multi-functionality by using the same data lines and driving circuits to perform both normal image data transmission and black data insertion for MPRT improvement. The timing controller integrates multiple functions (sensing control, black data insertion timing, compensation value application) into a unified control architecture, reducing the need for separate dedicated circuits and minimizing additional complexity while maintaining sensing accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces sensing deviations and improves image quality by accurately sensing and compensating for transistor characteristics, enhancing luminance uniformity and motion picture response time.
Implementation Method 1
organic light-emitting diodes disposed in a plurality of subpixels SP arrayed in a display panel, and may control the organic light-emitting diodes to emit light by controlling a voltage flowing through the organic light-emitting diodes
Data Source
AI summary
A display device includes a display panel having a plurality of gate lines, a plurality of data lines, and a plurality of subpixels; a gate driver circuit driving the plurality of gate lines; a data driver circuit driving the plurality of data lines; and a timing controller controlling signals applied to the gate driver circuit and the data driver circuit, wherein the timing controller controls the data driver circuit for a black data to be applied to at least one of designated subpixels among the plurality of subpixels, and controls the gate driver circuit for a gate signal, which is a signal for sensing a characteristic of a driving transistor of the designated subpixel, to be applied in an interval between times at which the black data are applied, such that the gate signal does not overlap the black data.