Display Sensing Channel Initialization for Dual-Line Accuracy
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Solution Overview
Problem
Display devices experience luminance unevenness and transistor deterioration due to manufacturing variations and aging, necessitating a sensing driver to compensate for these issues while minimizing its size.
Innovation Solution
A sensing driver performs a sensing operation on two sensing lines using one channel, with distinct initialization levels in separate sub-sensing periods to improve sensing accuracy, incorporating a sampling capacitor, line selection switches, and an analog-to-digital converter to process voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If one sensing channel is used to perform sensing operations on two sensing lines, then the size of the sensing driver is reduced, but sensing accuracy deteriorates due to offset between sensing data
Solution Approach 1:
The sensing period is divided into first and second sub-sensing periods, with each sub-period dedicated to sensing a specific sensing line. This temporal segmentation allows the single sensing channel to process each line independently with appropriate initialization, reducing offset errors while maintaining compact hardware design.
Solution Approach 2:
The initialization voltage level applied to the sampling capacitor is changed between sub-sensing periods. A first initialization level is used for the first sensing line and a second initialization level is used for the second sensing line. This parameter change compensates for offset differences and improves sensing accuracy without requiring additional hardware channels.
2Measurement precision
If different initialization levels are applied to the sampling capacitor in different sub-sensing periods, then sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The sensing operation follows a periodic pattern where the sensing period is regularly divided into sub-periods, each with specific initialization and sampling sequences. This periodic structure simplifies control logic by establishing predictable timing patterns, reducing the actual complexity despite multiple initialization levels.
Solution Approach 2:
The sampling capacitor is initialized with appropriate voltage levels before each sensing operation on different sensing lines. This preliminary action ensures that offset errors are compensated in advance, improving accuracy without requiring complex real-time adjustments during the sensing operation itself.
Data Source
AI summary
A sensing driver includes a sensing channel which samples a first sensing voltage of a first sensing line in a first sampling period, samples a second sensing voltage of a second sensing line in a second sampling period, and includes a sampling capacitor, a first line selection switch which connects the first sensing line to the sensing channel in a first sub-sensing period, and a second line selection switch which connects the second sensing line to the sensing channel in a second sub-sensing period. A voltage having a first initialization level is applied to a first electrode of the sampling capacitor in a first capacitor initialization period, and a voltage having a second initialization level different from the first initialization level is applied to the first electrode of the sampling capacitor in a second capacitor initialization period.