Display Subpixel Sensing with Dummy Periods for Noise Reduction
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing the characteristics of subpixels due to noise in the sensing current, leading to reduced luminance uniformity and increased power consumption.
Innovation Solution
A display device and driving method that includes a valid sensing period for a first subpixel during a first frame period and a dummy sensing period for the same or another subpixel during a second frame period, using a scan transistor, a driving transistor, and a sensing transistor to accurately compensate for luminance by removing noise and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing current is used to detect driving transistor characteristics, then characteristics can be sensed, but noise in the sensing current lowers sensing accuracy
Solution Approach 1:
The patent creates a dummy subpixel that copies the structure and characteristics of the actual subpixel. By measuring the dummy subpixel's characteristics under controlled conditions, the system can separate true signal from noise, improving sensing accuracy without directly measuring the noisy actual subpixel.
Solution Approach 2:
The dummy subpixel acts as an intermediary element that allows indirect measurement of the actual subpixel's characteristics. Instead of directly measuring the noisy sensing current from the actual subpixel, the system uses the dummy subpixel as a mediator to obtain cleaner measurement data.
2Measurement precision
If continuous sensing is performed to maintain accuracy, then sensing precision is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic sensing where the dummy subpixel is measured at specific intervals rather than continuously. The controller performs sensing operations at predetermined timing periods, allowing the system to maintain accuracy while reducing power consumption by avoiding constant measurement activity.
Solution Approach 2:
The dummy subpixel is prepared and measured in advance during off-periods or blank periods before actual display operations. This preliminary measurement allows the system to have accurate characteristic data ready without requiring continuous sensing during active display periods, thus reducing overall power consumption.
3Quantity of substance
If sensing is performed on all subpixels, then comprehensive characteristic data is obtained, but luminance uniformity compensation is reduced
Solution Approach 1:
The patent applies local quality by creating a dummy subpixel with specific localized characteristics that differ from actual subpixels. This dummy subpixel is designed with particular transistor configurations that allow it to serve as a reference for compensation while maintaining the overall luminance uniformity of the display panel.
Solution Approach 2:
The system uses the measurement data from the dummy subpixel to generate compensation values that are fed back to adjust the driving characteristics of actual subpixels. This feedback mechanism allows comprehensive characteristic data to be obtained from the dummy subpixel while maintaining luminance uniformity through active compensation adjustments.
Data Source
AI summary
A display device may include a plurality of subpixels. A period during which the plurality of subpixels are driven may include a first valid sensing period in which a valid sensing is performed on a first subpixel electrically connected to a first reference voltage line during a first frame period, and a dummy sensing period in which a dummy sensing is performed on the first subpixel or a second subpixel electrically connected to the first reference voltage line during a second frame period, thereby accurately sensing the characteristic values of subpixels. A driving method is also disclosed.