Pixel Capacitive Coupling for HDR Display Correction
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Solution Overview
Problem
Display devices face challenges in properly displaying images with high dynamic range (HDR) and high resolution without converting image data, leading to increased power consumption and the need for dedicated circuits for data conversion.
Innovation Solution
A display device structure incorporating transistors and capacitors that allow for image data correction and upconversion operations within the pixels, enabling HDR display and improved luminance without data conversion, using metal oxide transistors with low off-state current for efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated circuits and image data conversion are used for high-resolution and HDR displays, then display quality (resolution and HDR) is improved, but power consumption increases and device complexity increases
Solution Approach 1:
The display device performs image upconversion and HDR processing internally using built-in circuits (gamma correction circuit, upconversion circuit) without requiring external dedicated conversion circuits. The pixel circuit itself contains transistors and capacitors that enable direct control of display elements using low-resolution image data, allowing the device to serve its own image processing needs and eliminate the power consumption of external conversion equipment.
Solution Approach 2:
The pixel circuit is designed with multiple functions integrated into a single structure: it handles both standard display operations and specialized functions like image upconversion and HDR processing. The circuit block includes transistors (first through fourth transistors) and capacitors (first and second capacitors) that can perform multiple operations including gamma correction, upconversion, and direct control of display elements, eliminating the need for separate dedicated circuits for each function.
2Measurement precision
If dedicated circuits and image data conversion are used for high-resolution and HDR displays, then display quality (resolution and HDR) is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple image processing functions (gamma correction, upconversion, HDR processing) into a single integrated pixel circuit. The circuit block merges the functions of multiple transistors and capacitors to perform what would traditionally require separate dedicated circuits, thereby reducing overall device complexity while maintaining high display quality.
Solution Approach 2:
The pixel circuit is designed with multiple functions integrated into a single structure: it handles both standard display operations and specialized functions like image upconversion and HDR processing. The circuit block includes transistors (first through fourth transistors) and capacitors (first and second capacitors) that can perform multiple operations including gamma correction, upconversion, and direct control of display elements, eliminating the need for separate dedicated circuits for each function.
3Reliability
If transistors with metal oxide channels are used, then off-state current is reduced improving reliability, but manufacturing complexity increases
Solution Approach 1:
The patent changes the material parameter of the transistor channel from conventional semiconductor materials to metal oxide semiconductors (such as IGZO - indium gallium zinc oxide). This material parameter change fundamentally reduces the off-state current by several orders of magnitude, achieving ultra-low leakage current that improves reliability. The metal oxide semiconductor layer is formed using sputtering or other deposition techniques that can be integrated into existing manufacturing processes.
Solution Approach 2:
The transistor structure uses composite materials, specifically metal oxide semiconductors composed of multiple elements (indium, gallium, zinc, oxygen) in specific ratios. This composite material approach allows optimization of both electrical characteristics (ultra-low off-state current) and manufacturability, as these materials can be deposited using standard thin-film fabrication techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables improved image quality, reduced power consumption, and proper display without data conversion, supporting high-resolution and HDR capabilities while allowing for the superimposition of images, thus enhancing the reliability and efficiency of the display device.
Implementation Method 1
a channel formation region of the third transistor includes a metal oxide
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.