Adaptive Dummy-Line Sensing in Display Panels for High-Frequency Driving
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Solution Overview
Problem
High-resolution and high-frequency driving environments in display devices face challenges in securing enough sensing time for compensation operations and detecting defects in the display panel.
Innovation Solution
A display device with a circuit that dynamically adjusts the number of sensing target dummy subpixels in response to changes in driving frequency, increasing or decreasing them during a sensing period to ensure sufficient sensing time and detect defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving frequency is increased to achieve high-resolution display, then the display quality is improved, but the sensing time becomes insufficient for compensation operations
Solution Approach 1:
The patent applies dynamics by making the number of sensing target dummy subpixel lines adjustable rather than fixed. The circuit dynamically changes this parameter based on the driving frequency, allowing the system to adapt sensing resources to match the time constraints imposed by higher driving frequencies.
Solution Approach 2:
The patent changes the parameter of the number of sensing target dummy subpixel lines in response to driving frequency variations. By increasing this number when driving frequency increases, the system compensates for the reduced sensing time available at higher frequencies.
2Measurement precision
If the number of sensing target dummy subpixel lines is increased to improve defect detection capability, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent makes the dummy subpixel lines serve multiple functions: they act as both protective elements during orbit driving and as sensing targets for defect detection. This multi-functionality allows the system to improve measurement precision without adding separate dedicated sensing structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The circuit dynamically adjusts the number of active sensing target dummy subpixel lines based on driving conditions. This dynamic configuration allows the system to optimize defect detection capability according to actual operational requirements, avoiding the need to always maintain maximum sensing capacity and thus reducing overall device complexity.
Data Source
AI summary
A display device can include a display panel including subpixels disposed in a display area and dummy subpixel lines disposed in an outer area of the display area, and a circuit configured to output a data voltage for driving the display panel during a first period and acquire a sensing value from the display panel during a second period, and in response to a change of a driving frequency of the display panel, increase or decrease a number of sensing target dummy subpixel lines among the dummy subpixel lines to sense during the second period.