Display Pixel Monitoring with a Shared Sensing Channel
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Solution Overview
Problem
Display devices face challenges due to variations in mobility and threshold voltages of transistors and light emitting diodes across pixels, leading to inconsistencies in image quality and reliability.
Innovation Solution
A display device design that includes a shared sensing channel for two sensing lines, allowing time-sharing of electrical characteristic measurements, with initialization of the channel before each measurement to ensure accurate recording of sensing voltages, and controlled application of reference data voltages to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared sensing channel is used for multiple sensing lines, then device complexity is reduced, but measurement precision deteriorates due to time-sharing and initialization requirements
Solution Approach 1:
The sensing channel is initialized before each sensing voltage recording operation. This preliminary action clears any residual charges or states from previous measurements, ensuring that each measurement starts from a known state and preventing cross-contamination between measurements of different pixels
Solution Approach 2:
The system employs periodic time-sharing measurement cycles where the shared sensing channel alternates between different sensing lines. Each pixel's electrical characteristics are measured in discrete time periods, with the channel being reset and reinitialized between measurements to maintain accuracy despite the shared resource configuration
2Reliability
If electrical characteristics are measured for each pixel, then reliability is improved, but loss of time increases due to sequential measurement of multiple pixels
Solution Approach 1:
Multiple sensing lines are merged into a single shared sensing channel that serves multiple pixels. This consolidation reduces the overall sensing operation time by using one channel for multiple measurements instead of requiring separate channels for each pixel, while still maintaining the ability to measure electrical characteristics of each individual pixel through time-sharing
Data Source
AI summary
A display device may include a display panel including first and second pixels respectively connected to first and second sensing lines, a sensing driver including a sensing channel shared by the first and the second sensing lines, and a controller configured to control the display panel and the sensing driver. The controller may be configured to, in a first time period, electrically disconnect the sensing channel from the first and the second sensing lines, and reflect electrical characteristics of the first and the second pixels in the first and the second sensing lines, respectively, as sensing voltages, and in a second time period, record the sensing voltages reflected in the first and the second sensing lines in the sensing channel by time-sharing.