Optical Grating for Display Panel Color Shift Correction

Solution Overview

Problem

Large-size display panels experience color shift at increased viewing angles due to varying light intensity attenuation across different wavelengths, affecting the display's color accuracy and overall performance.

Innovation Solution

The implementation of an optical grating with transparent and non-transparent areas on the black matrix areas of sub-pixels, or increasing the thickness of the pixel defining layer of sub-pixels, to partially block light and compensate for differences in light intensity attenuation, thereby alleviating color shift at large viewing angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the display panel size is increased, then the viewing angle is increased, but color shift occurs at large viewing angles

Engineering Contradiction:

Improvedisplay panel sizeVSAvoidcolor accuracy

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The patent applies different thicknesses of the pixel defining layer to different sub-pixels (R, G, B) based on their specific light attenuation characteristics. The G sub-pixel receives a greater thickness increase compared to R and B sub-pixels, creating localized structural differences that compensate for wavelength-specific attenuation variations at large viewing angles.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent modifies the physical parameter of the pixel defining layer thickness to alter light transmission characteristics. By increasing the thickness of the pixel defining layer, particularly for the G sub-pixel, the light attenuation is adjusted to compensate for the natural attenuation differences between wavelengths at large viewing angles, thereby maintaining color accuracy.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the thickness of pixel defining layer is increased, then light transmission is blocked, but light intensity attenuation difference is compensated

Engineering Contradiction:

Improvecolor accuracyVSAvoidlight transmission

Core Design Contradiction:

Manufacturing precisionVSIllumination intensity

Solution Approach 1:

The patent applies different thicknesses of the pixel defining layer to different sub-pixels (R, G, B) based on their specific light attenuation characteristics. The G sub-pixel receives a greater thickness increase compared to R and B sub-pixels, creating localized structural differences that compensate for wavelength-specific attenuation variations at large viewing angles.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent modifies the physical parameter of the pixel defining layer thickness to alter light transmission characteristics. By increasing the thickness of the pixel defining layer, particularly for the G sub-pixel, the light attenuation is adjusted to compensate for the natural attenuation differences between wavelengths at large viewing angles, thereby maintaining color accuracy.

Inventive Principle:

Principle #35Parameter changes

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 solution ensures uniform light intensity attenuation across sub-pixels, reducing color shift and maintaining display accuracy even at wider viewing angles, as demonstrated by the adjustment of optical grating parameters and pixel defining layer thicknesses.

Implementation Method 1

The optical grating includes transparent areas and non-transparent areas. The non-transparent areas are provided on the black matrix areas. The optical grating is configured as such that when a sub-pixel is observed at a large viewing angle, light transmitted by the sub-pixel is partially blocked by the non-transparent areas of the optical grating.

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

increasing a thickness of a pixel defining layer of a sub-pixel, so that when the sub-pixel is observed at a large viewing angle, light transmitted by the sub-pixel is partially blocked by the pixel defining layer.

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Data Source

PatentUS10910452B2Method for alleviating color shift at large viewing angle, and display panel

Publication Date: 2021.02.02 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

Disclosed is a method for alleviating color shift of a display panel at a large viewing angle. The panel includes a sub-pixel array formed by R, G, B sub-pixels, and black matrix areas located between the sub-pixels. The method includes providing, above the sub-pixel array, an optical grating that is parallel with the sub-pixel array. The optical grating includes transparent areas and non-transparent areas. The non-transparent areas are provided above the black matrix areas. The optical grating is configured as such that when a sub-pixel is observed at a large viewing angle, light transmitted through the sub-pixel is partially blocked by the non-transparent areas of the optical grating.