Pixel Sensing Circuit Shared Components Source Driver IC Size
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Solution Overview
Problem
The increasing size and manufacturing costs of source driver ICs in OLED display devices due to the need for multiple sensing channels in pixel sensing circuits, which complicates the compensation for changing electrical characteristics of OLED pixels, leading to image quality degradation.
Innovation Solution
A pixel sensing circuit with shared components, including at least two sensing channels, a current integrator circuit, and sample-and-hold circuits, which allows for efficient integration and sensing of pixel current characteristics, reducing the size of the source driver IC by sharing the current integrator circuit and optimizing the sensing process across multiple frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensing channel circuits are connected to respective sensing channels to compensate for pixel electrical characteristic changes, then image quality is improved, but the area occupied by the pixel sensing circuit increases
Solution Approach 1:
The patent merges multiple sensing channel circuits into a single integrated pixel sensing circuit that can sequentially process multiple sensing channels. The current integrator accumulates current signals from different sensing channels over time, and the sample-and-hold circuits store the integrated values for each channel, enabling multiple sensing functions to be performed by a unified circuit structure rather than separate parallel circuits.
Solution Approach 2:
The pixel sensing circuit is designed with multi-functionality to handle multiple sensing channels sequentially. The current integrator can integrate current signals from any sensing channel, and the sample-and-hold circuits can store results for different channels, making the circuit universal across multiple sensing tasks rather than dedicated to a single channel.
2Reliability
If multiple sensing channel circuits are connected to respective sensing channels, then pixel sensing capability is improved, but the chip size increases
Solution Approach 1:
The patent combines multiple sensing channel circuits into one integrated circuit structure. Instead of having separate physical circuits for each sensing channel, the invention uses a single current integrator and shared sample-and-hold circuits that sequentially process signals from multiple sensing channels, thereby reducing the overall chip area required.
Solution Approach 2:
The pixel sensing circuit operates by sequentially selecting and processing different sensing channels in a periodic manner. The circuit switches between different sensing channels over time, integrating and sampling signals from each channel in turn, which allows multiple sensing functions to be achieved with a single circuit structure rather than requiring simultaneous parallel processing circuits.
3Reliability
If multiple sensing channel circuits are implemented, then compensation for electrical characteristic changes is improved, but manufacture costs increase
Solution Approach 1:
The patent merges multiple sensing channel circuits into a single integrated circuit, reducing the total number of circuit components that need to be manufactured. This consolidation simplifies the manufacturing process, reduces material usage, and lowers production costs while maintaining the capability to sense and compensate for electrical characteristic changes across multiple pixel columns.
Data Source
AI summary
An embodiment relates to a pixel sensing circuit and a pixel sensing method and, more particularly, to a pixel sensing circuit and a pixel sensing method for reducing the size of a source driver IC by sharing some components in a pixel sensing circuit and for sensing a pixel using a pixel sensing circuit in which some components are shared.