Display Device Pixel Circuit with Capacitive Coupling for Low Power HDR
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Solution Overview
Problem
Display devices face challenges in properly displaying images with high resolution and high dynamic range (HDR) without converting image data, leading to increased power consumption and complexity, especially when dealing with resolutions like 8K4K and 4K2K, and require efficient methods to enhance image quality and luminance while minimizing power usage.
Innovation Solution
A display device with a pixel structure incorporating a light-emitting element with a tandem structure and transistors, capacitors, and a circuit block that allows for image data correction and processing without conversion, using metal oxide transistors with low off-state current to improve image quality and HDR performance, and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data conversion is performed to match display device resolution, then proper display is achieved, but power consumption increases and device complexity increases
Solution Approach 1:
The patent extracts the image data conversion function from external processing devices and implements it within the display device itself using dedicated conversion circuits. This allows the display device to receive image data in various resolutions and internally convert it to match the display resolution, eliminating the need for external conversion and reducing overall system power consumption while maintaining display accuracy.
Solution Approach 2:
The display device is designed with multi-functional capabilities to handle both image data conversion and display operations within a single integrated system. The conversion circuits can process different resolution formats (e.g., 8K4K, 4K2K, Full HD) and adaptively convert them to the appropriate display resolution, making the device universally compatible with various image sources while managing power consumption efficiently.
2Reliability
If image data conversion is performed to match display device resolution, then proper display is achieved, but device complexity increases
Solution Approach 1:
The image data conversion function is segmented into distinct conversion circuits that are integrated within the display device. These separate conversion circuits handle different resolution conversion tasks independently, allowing for modular design that manages complexity by dividing the conversion process into manageable segments rather than using a single complex conversion system.
3Illumination intensity
If dedicated conversion circuits are added for HDR and resolution conversion, then image quality and luminance are enhanced, but device complexity increases
Solution Approach 1:
The patent merges the HDR processing function and resolution conversion function into a single integrated circuit block within the display device. This combination allows the device to perform both high dynamic range processing and resolution conversion simultaneously using shared hardware resources, enhancing luminance and image quality while avoiding the need for separate dedicated circuits for each function, thus managing overall device complexity.
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 proper display without image data conversion, enhances image quality and luminance, and reduces power consumption by using metal oxide transistors with low off-state current, effectively handling high and low resolutions, and supporting HDR and upconversion operations.
Implementation Method 1
The light-emitting element is configured to emit light in response to the third signal
Data Source
AI summary
A display device capable of improving image quality with low power consumption is provided. A storage node is provided in each pixel and a first signal can be held in the storage node. A second signal is added to the first signal by capacitive coupling to generate a third signal. A display element operates in response to the third signal. Thus, regardless of the output voltage of a driver that supplies data, a high voltage can be supplied to the display element. Consequently, even a display element that requires a relatively high voltage for operation can operate with low power consumption.