Signal Processing for Four-Subpixel Display Color Gamut Expansion
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Solution Overview
Problem
Self-light-emission type display devices, such as organic EL display devices, lack a technical system to actively utilize the maximum color gamut that can be expressed by their display panels, which are enhanced by including a subpixel that emits non-basic-color light in addition to red, green, and blue subpixels.
Innovation Solution
A display device and signal processing device that include a display section with subpixels emitting three-basic-color light and a fourth subpixel emitting non-basic-color light, along with signal processing sections that expand and adapt video signals to the color gamut capabilities of the display panel, converting the signals into appropriate formats for output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display panel includes four subpixels (R, G, B, and W) to expand color expression range, then the color gamut capability is improved, but no technical system exists to actively utilize the maximum color gamut
Solution Approach 1:
The signal processing is divided into two distinct sections: a first signal processing section that expands the video signal to 12-bit depth and adapts it to the display panel's color gamut, and a second signal processing section that converts the expanded signal into separate R, G, B, and W subpixel signals. This segmentation enables systematic utilization of the four-subpixel structure to maximize color gamut expression.
Solution Approach 2:
The video signal is expanded and adapted to the display panel's color gamut before being converted to subpixel signals. This preliminary expansion to 12-bit depth and color gamut adaptation ensures that the maximum color expression capability is prepared in advance, allowing the display panel to utilize its full color gamut potential when displaying images.
2Adaptability or versatility
If video signal is expanded and adapted to color gamut, then color expression range is improved, but signal processing complexity increases
Solution Approach 1:
The signal processing function is segmented into two specialized sections: expansion/adaptation processing in the first section and conversion to subpixel signals in the second section. This division allows each section to focus on specific tasks, improving processing efficiency while achieving maximum color expression range utilization.
Solution Approach 2:
The video signal undergoes parameter changes including bit depth expansion from standard to 12-bit and color gamut adaptation to match the display panel's capabilities. These parameter changes enable the signal to fully utilize the expanded color expression range provided by the four-subpixel structure.
3Adaptability or versatility
If four subpixels per pixel are used, then color gamut is expanded, but manufacturing and control complexity increases
Solution Approach 1:
The display panel with four subpixels is designed to be universally compatible with both standard video signals and the expanded 12-bit color gamut signals. The panel structure itself serves multiple functions: displaying standard images and maximizing color gamut expression when equipped with the signal processing sections, thereby easing manufacturing by maintaining structural universality.
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
This configuration allows for the active utilization of the maximum color gamut that a display panel can express, expanding the color expression range and improving image quality by incorporating a subpixel that emits white light alongside red, green, and blue subpixels.
Implementation Method 1
an organic light emitting diode (OLED: Organic Light Emitting Diode) to which phenomenon called organic electroluminescence (organic EL) has been applied
Data Source
AI summary
The present technology relates to a display device and a signal processing device that have made it possible to actively utilize maximumly a color gamut that a display panel can express.Provided is a display device, including: a display section in which display pixels that each include a first subpixel, a second subpixel, and a third subpixel that emit three-basic-color light and a fourth subpixel that emits non-basic-color light are arranged two-dimensionally; a first signal processing section that expands a video signal being input and corresponding to the basic-color light and adapts the video signal to a color gamut that the display section can express; and a second signal processing section that converts an expanded video signal being the video signal having been expanded into a first signal, a second signal, and a third signal that correspond to the basic-color light and a fourth signal that corresponds to the non-basic-color light, and outputs the signals to the display section. The present technology can be applied to, for example, a self-light-emission type display device, such as an organic EL display device.