Pixel Sensing Device Noise Compensation Circuit
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Solution Overview
Problem
Existing pixel sensing methods in organic light emitting display devices face challenges due to panel noise, which affects the accuracy and reliability of sensing pixel driving characteristics, leading to luminance deviations across pixels.
Innovation Solution
A pixel sensing device is introduced, comprising a current integrator, a sample and hold unit, an analog to digital converter (ADC), and a capacitor to minimize panel noise distortion. The current integrator integrates pixel current, while the sample and hold unit and ADC convert the output voltage into a digital signal, and the capacitor reduces noise, ensuring consistent sensing results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current integrator is used to sense pixel current, then pixel driving characteristics can be sensed, but panel noise distorts the output voltage and reduces sensing accuracy
Solution Approach 1:
A noise compensation circuit is introduced as an intermediary component that generates a compensation signal to counteract the panel noise affecting the current integrator output. The compensation circuit includes a noise sensor that detects panel noise and a compensation signal generator that produces an opposing signal to cancel the noise distortion, thereby preserving sensing accuracy without requiring changes to the core current integrator functionality.
2Device complexity
If panel noise is amplified by the integrator amplifier, then the output voltage is distorted, but the sensing channel remains the same
Solution Approach 1:
The panel noise that is inevitably amplified by the integrator amplifier is converted into a useful compensation signal. The noise compensation circuit captures the amplified noise through a noise sensor and then generates a compensation signal that mirrors this noise pattern. By injecting this compensation signal in opposition to the noisy output, the harmful noise amplification is transformed into a correctable distortion, maintaining output voltage accuracy without simplifying the sensing channel structure.
3Reliability
If external compensating schemes are used to adjust input image data, then luminance deviation can be corrected, but sensing reliability is reduced due to noise
Solution Approach 1:
A feedback mechanism is implemented where the output of the current integrator is continuously monitored for noise distortion. The noise compensation circuit uses this feedback information to dynamically adjust the compensation signal, creating a closed-loop system that automatically corrects for panel noise. This feedback approach enhances sensing reliability by continuously adapting to noise conditions while maintaining accurate pixel driving characteristic measurements.
Data Source
AI summary
The present disclosure relates to a pixel sensing device and the organic light emitting display device including the same which reduce or minimize the influence of the panel noise and improve sensing accuracy and sensing reliability. The pixel sensing device includes a current integrator connected to a pixel through a sensing line of a display panel and integrating a pixel current flowing through the pixel to generate an integrator output voltage; a sample and hold unit sampling and holding the integrator output voltage; an analog to digital converter (ADC) converting the integrator output voltage output from the sample and hold unit into a digital signal; and a first capacitor serving to reduce or minimize a distortion degree of the integrator output voltage due to panel noise mixed to the pixel current.