Display Panel Sub-Pixel Mixing for HUD Brightness and NTSC Gamut

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Solution Overview

Problem

HUD products using LCD technology face challenges in achieving high display brightness while ensuring necessary NTSC color gamut saturation due to the trade-off between CF film thickness and transmittance.

Innovation Solution

A display panel design with each pixel comprising a primary color sub-pixel and auxiliary color sub-pixels, where the auxiliary sub-pixels are turned on to mix with partial light from the primary sub-pixel to produce white light, enhancing brightness and meeting NTSC color gamut saturation requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If the thickness of the Color Filter (CF) film is increased to ensure NTSC color gamut saturation, then color saturation is improved, but transmittance decreases

Engineering Contradiction:

ImproveNTSC color gamut saturationVSAvoidtransmittance

Core Design Contradiction:

Duration of action of moving objectVSIllumination intensity

Solution Approach 1:

The pixel is divided into multiple sub-pixels with different functions: primary color sub-pixels for color display and auxiliary color sub-pixels for brightness enhancement. This segmentation allows the CF film to be optimized for color saturation in primary sub-pixels while auxiliary sub-pixels compensate for transmittance loss, resolving the contradiction between color gamut saturation and transmittance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines primary color sub-pixels and auxiliary color sub-pixels within the same pixel structure. The auxiliary sub-pixels are merged with the primary sub-pixels and work together to produce the final display output, allowing simultaneous achievement of color saturation and brightness.

Inventive Principle:

Principle #5Merging (Combining)

2Illumination intensity

If the thickness of the CF film is decreased to improve transmittance, then brightness is improved, but NTSC color gamut saturation decreases

Engineering Contradiction:

ImprovetransmittanceVSAvoidNTSC color gamut saturation

Core Design Contradiction:

Illumination intensityVSDuration of action of moving object

Solution Approach 1:

Different regions of the pixel (primary color sub-pixels vs. auxiliary color sub-pixels) have different functional qualities. Primary sub-pixels are optimized for color saturation with appropriate CF film thickness, while auxiliary sub-pixels are optimized for brightness with thinner CF film or different optical properties, allowing simultaneous optimization of both color gamut and transmittance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent dynamically controls the brightness of auxiliary color sub-pixels to compensate for the reduced color saturation effect. By adjusting the intensity of auxiliary sub-pixels, the system can adaptively maintain both color accuracy and overall brightness performance.

Inventive Principle:

Principle #15Dynamics

3Illumination intensity

If display brightness is increased for better sunlight readability, then readability is improved, but NTSC color gamut saturation decreases

Engineering Contradiction:

Improvedisplay brightnessVSAvoidNTSC color gamut saturation

Core Design Contradiction:

Illumination intensityVSDuration of action of moving object

Solution Approach 1:

The pixel structure is segmented into primary color sub-pixels for maintaining color gamut saturation and auxiliary color sub-pixels for enhancing display brightness. This segmentation enables the display to achieve high brightness for sunlight readability while preserving color accuracy through the coordinated work of both sub-pixel types.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The auxiliary color sub-pixels serve multiple functions: they enhance overall display brightness for sunlight readability, compensate for transmittance losses, and work with primary sub-pixels to maintain color gamut saturation. This multi-functionality resolves the contradiction between brightness and color saturation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 ensures high display brightness and NTSC color gamut saturation by mixing light from auxiliary and primary sub-pixels, improving the display effect of HUD technology.

Implementation Method 1

Auxiliary color sub-pixel of the pixels and partial light of the primary color sub-pixel are mixed into white light

Methodology Applied

Scientific EffectLight mixing:

Data Source

PatentUS20250294990A1Display panel and display apparatus

Publication Date: 2025.09.18 XIAMEN TIANMA MICRO ELECTRONICS

AI summary

A display panel includes a plurality of pixels. A pixel of the plurality of pixels includes a plurality of color sub-pixels. One color sub-pixel of the plurality of color sub-pixels of the pixel is a primary color sub-pixel, and other color sub-pixels are auxiliary color sub-pixels. When the primary color sub-pixel of the pixel is turned on, the auxiliary color sub-pixels of the pixel are turned on. The auxiliary color sub-pixels of the pixel and partial light of the primary color sub-pixel are mixed into white light and the pixel displays a primary color.