Data Driver Noise Attenuator for OLED Pixel Deterioration Sensing
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in accurately sensing the deterioration of pixels due to current noise in current-sensing circuits, leading to decreased luminance and display quality, and increased manufacturing costs.
Innovation Solution
A data driver with a noise attenuator and current integrator configuration that converts image data into a data signal, outputs it to a data line, and uses an ADC to generate digital signals from integrated voltages, effectively reducing current noise and enabling accurate pixel deterioration sensing in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current-sensing circuits are added to every channel for sensing pixel deterioration, then measurement precision is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The current sensing function is segmented into two separate cascode circuits (first and second cascode circuits) that can be selectively activated. This allows the system to distribute sensing capabilities across different circuits rather than requiring all channels to have full sensing circuits simultaneously, reducing overall device complexity while maintaining measurement precision when needed.
Solution Approach 2:
The data driver circuit is designed to perform multiple functions: it can operate as a standard data driver for displaying image data, and it can also function as a current sensing circuit for detecting pixel deterioration. The same physical circuit structure supports both normal display operation and deterioration sensing, eliminating the need for separate dedicated sensing circuits in every channel.
2Measurement precision
If current-sensing circuits are added to every channel for sensing pixel deterioration, then measurement precision is improved, but manufacturing costs increase
Solution Approach 1:
The data driver circuit is designed to perform multiple functions: it can operate as a standard data driver for displaying image data, and it can also function as a current sensing circuit for detecting pixel deterioration. The same physical circuit structure supports both normal display operation and deterioration sensing, eliminating the need for separate dedicated sensing circuits in every channel.
Solution Approach 2:
The sensing circuit functionality is merged with the existing data driver circuit. The first and second cascode circuits are integrated into the data driver structure, allowing the system to combine driving and sensing functions in a single circuit implementation, thereby reducing manufacturing complexity and cost.
3Measurement precision
If noise attenuators are added to reduce current noise in sensing circuits, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The noise attenuators act as intermediary components between the cascode circuits and the rest of the system. These attenuators are strategically placed to reduce current noise at critical points in the circuit, providing noise filtering without requiring complex noise reduction systems throughout the entire device.
Solution Approach 2:
Rather than implementing uniform noise reduction across the entire device, noise attenuators are selectively placed at specific locations (first node and second node) where current noise most significantly impacts measurement precision. This localized approach reduces noise where it matters most while minimizing overall device complexity.
Data Source
AI summary
A data driver includes a data signal converter to convert image data to a data signal, an output buffer to output the data signal to a data line, a first cascode circuit connected to the output buffer and including a plurality of transistors, a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and to attenuate a first current noise, a second cascode circuit connected to the output buffer and including a plurality of transistors, a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and to attenuate a second current noise, a current integrator to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascade circuit, and an analog-digital converter (ADC) to convert the integrated voltage to a digital signal.