Display Device Double Sampling Sub-Pixel Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in accurately sensing electrical characteristics of pixels due to variations in driving environments, leading to inconsistent compensation and potential pixel deterioration.
Innovation Solution
A display device and method that utilize a double sampling technique to sense electrical characteristics of sub-pixels by applying black gradation and sensing data voltages alternately, allowing for the subtraction of common noise and precise determination of operating points, thereby ensuring accurate compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation method is used to sense pixel voltages, then pixel deterioration can be compensated, but sensing accuracy is affected by driving environment variations
Solution Approach 1:
The patent applies periodic action by performing multiple sensing operations at different stages: first sensing the initial voltage before data voltage application, then sensing again after data voltage is applied. This periodic sensing allows the system to capture voltage changes due to driving environment variations and compensate accordingly, improving both reliability and measurement precision.
Solution Approach 2:
The patent implements feedback by using the sensed voltage values to adjust and compensate the data voltage. The system measures the actual pixel voltage through sensing lines, compares it with expected values, and modifies subsequent driving voltages to compensate for deviations caused by driving environment variations, thereby maintaining accurate compensation.
2Measurement precision
If sensing is performed without initialization, then process time is reduced, but sensing accuracy deteriorates due to varying driving environments
Solution Approach 1:
The patent applies preliminary action by performing an initialization step before the actual sensing operation. During this preliminary phase, the pixel is prepared by applying appropriate voltages and allowing stabilization, ensuring that subsequent sensing measurements are accurate. This preliminary initialization ensures measurement precision while minimizing time loss by being performed efficiently before the critical sensing moment.
Data Source
AI summary
Disclosed are a light emitting display device and a driving method thereof, wherein a sensing mode of the display device includes a first sensing step in which an electrical characteristic of a first sub-pixel is sensed, a first initialization step set in advance of the first sensing step, a second sensing step in which an electrical characteristic of the second sub-pixel is sensed, and a second initialization step set in advance of the second sensing step.