Pixel Storage Node Coupling for HDR Display Correction
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Solution Overview
Problem
Display devices face challenges in maintaining image quality and efficiency when dealing with resolution mismatches between input image data and display capabilities, particularly with high dynamic range (HDR) processing, which often requires power-consuming data conversion and dedicated circuits.
Innovation Solution
A display device incorporating specific transistor configurations, including OS transistors with metal oxide channels, capacitive coupling, and storage nodes to correct image data without conversion, enabling high-resolution and HDR displays with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data conversion circuits are added to handle resolution mismatches and HDR processing, then display capability and image quality are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the image correction function from dedicated conversion circuits and implements it through capacitor coupling between pixel circuits. By removing the need for separate data conversion circuits and performing correction operations directly within the pixel circuit through capacitive coupling, the invention reduces device complexity while maintaining display capability.
Solution Approach 2:
The patent makes the pixel circuit multi-functional by enabling it to perform both image data storage and image correction operations. The capacitor coupling mechanism allows the same pixel circuit structure to handle multiple tasks (storing image data and correcting display characteristics) without requiring additional dedicated circuits, thereby reducing overall device complexity.
2Measurement precision
If data conversion circuits are added to handle resolution mismatches and HDR processing, then display capability and image quality are improved, but power consumption increases
Solution Approach 1:
The patent removes the power-consuming data conversion circuits by extracting the correction function and implementing it through passive capacitor coupling within the pixel circuit. This eliminates the need for active conversion operations, thereby reducing power consumption while maintaining display capability.
Solution Approach 2:
The patent implements image correction through periodic capacitor coupling operations that occur during normal pixel operation. By using the natural switching cycles of the pixel circuit to perform correction through capacitive coupling, the system avoids continuous power consumption associated with dedicated conversion circuits.
3Measurement precision
If dedicated HDR processing circuits are implemented, then high dynamic range display quality is improved, but device complexity increases
Solution Approach 1:
The patent enables the pixel circuit to perform HDR-related correction operations through capacitor coupling, making the same circuit structure multi-functional. This approach allows HDR display quality improvement without adding dedicated HDR processing circuits, thereby avoiding increased device complexity.
Solution Approach 2:
The patent introduces capacitor coupling as an intermediary mechanism that enables correction operations between pixel circuits. This intermediary approach allows HDR processing functionality to be achieved through passive electrical coupling rather than complex active circuits.
4Ease of operation
If image data conversion is performed to match display resolution, then proper display is achieved, but processing time and power consumption increase
Solution Approach 1:
The patent performs image correction through capacitor coupling during the normal pixel operation cycles rather than requiring separate preprocessing steps. By integrating the correction function into the existing pixel operation timeline, the system achieves proper display without adding processing time delays.
Data Source
AI summary
A display device capable of improving image quality is provided. A storage node is provided in each pixel and first data can be held in the storage node. Second data is added to the first data by capacitive coupling, which can be supplied to a display element. Thus, the display device can display a corrected image. A reference potential for the capacitive coupling operation is supplied from a power supply line or the like, and thus the first data and the second data can be supplied from a common signal line.