Data Driver Internal Sensing Voltage for OLED Noise Reduction
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Solution Overview
Problem
Conventional methods for compensating device characteristics in organic light-emitting displays suffer from reduced sensing accuracy due to noise interference when using externally supplied reference voltages for both driving and sensing operations.
Innovation Solution
A data driver system that generates an internally sourced sensing reference voltage and integrates sensing results, while using an externally supplied driving reference voltage to correct for variations in the sensing reference voltage through an offset correction mechanism, thereby minimizing noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an externally supplied reference voltage is used for sensing operation, then the sensing operation can be performed, but the sensing accuracy is reduced due to noise interference
Solution Approach 1:
The patent divides the reference voltage supply into two separate paths: one for driving operation (using externally supplied voltage) and one for sensing operation (using internally generated voltage). This segmentation isolates the sensing path from external noise sources, thereby improving sensing accuracy while maintaining the ability to perform both driving and sensing operations.
2Object-affected harmful factors
If an internally generated sensing reference voltage is used, then noise interference is reduced, but voltage variations may occur
Solution Approach 1:
The patent implements a feedback mechanism where the data driver senses the sensing line voltage and compares it against the internally generated sensing reference voltage. The sensing result is used to generate compensation signals that adjust for voltage variations, ensuring stable operation despite the use of internally generated voltage.
Solution Approach 2:
The patent dynamically adjusts the sensing reference voltage level based on the sensed voltage variations. By changing the parameter (voltage level) in response to detected variations, the system maintains accurate sensing operation while compensating for the instability of internally generated voltage.
3Reliability
If a sensing line is used for compensation operation, then device characteristics can be compensated, but the brightness characteristics change when device degradation occurs
Solution Approach 1:
The patent introduces a sensing line as an intermediary element that carries reference voltage signals separate from the data lines used for driving. This intermediary sensing path enables compensation operations without directly affecting the data signal transmission, allowing device characteristic compensation while maintaining proper brightness characteristics through separate sensing and driving paths.
Data Source
AI summary
A display device comprises a display panel that displays an image and has a data line and a sensing line, a data driver that drives the display panel, and a power supply part that delivers a driving reference voltage through a wiring line connected to the data driver. The data driver supplies a data signal to the data line, supplies the driving reference voltage through the sensing line, senses the sensing line based on an internally generated sensing reference voltage, and integrates a sensing result.