Display Panel Black Matrix Reflection Structure for Transition Region Brightness

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Solution Overview

Problem

In OLED panels using polarizer-free technology combined with camera under panel technology, the transition region appears dimmer compared to the display region due to smaller light-emitting pixel areas, leading to reduced light reflectivity and visibility issues when the panel is screen-off or screen-on.

Innovation Solution

Incorporating a reflection structure with third openings in the black matrix layer, positioned to face external light, which increases light reflectivity by reflecting external light through these openings, thereby enhancing the brightness of the transition region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If polarizer-free technology is used to reduce power consumption, then power consumption is reduced, but light reflectivity increases causing serious surface reflection

Engineering Contradiction:

Improvepower consumptionVSAvoidsurface reflection

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful surface reflection into a beneficial feature by introducing a reflection structure that deliberately reflects external light through third openings in the black matrix layer. This transforms the unwanted reflection characteristic of polarizer-free displays into a useful function that enhances visibility and brightness of the transition region, particularly in screen-off states.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Adaptability or versatility

If the area of light-emitting pixels in the transition region is reduced to accommodate camera placement, then camera integration is achieved, but the transition region becomes dimmer

Engineering Contradiction:

Improvecamera integrationVSAvoidbrightness of transition region

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by introducing third openings specifically in the transition region's black matrix layer, allowing external light to be reflected locally in this dimmer area. This localized reflection enhancement targets precisely where brightness is needed most (the transition region) without affecting other areas, thereby improving overall brightness uniformity across the display surface.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The reflection structure acts as an intermediary element that mediates between the limited light-emitting pixel area and the requirement for adequate brightness. By introducing this intermediate reflection mechanism, the patent enables the transition region to achieve sufficient brightness even with reduced light-emitting pixel area, thus resolving the contradiction between camera integration and brightness maintenance.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the transition region is designed with smaller pixel areas for camera compatibility, then device integration is improved, but visibility and uniformity deteriorate

Engineering Contradiction:

Improvedevice integrationVSAvoidvisibility uniformity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

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 improves the light reflectivity and brightness of the transition region, making it more comparable to the display region, both when the panel is in screen-off and screen-on states, by effectively addressing the dimness issue through strategic placement and design of the reflection structure.

Implementation Method 1

a reflection structure disposed on a side of the black matrix layer close to the substrate, and the reflection structure is disposed to directly face the third openings

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS20240153427A1Display panel and display device

Publication Date: 2024.05.09 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A display panel includes: a first display region; a component region surrounded by the first display region, wherein the component region includes at least one transmission region and at least one second display region surrounding the transmission region; one or more first sub-pixels disposed in the first display region; one or more second sub-pixels disposed in the second display region; a black matrix layer disposed in the first and second display regions and comprising a first opening overlapping the first sub-pixel in the first display region, a second opening overlapping the second sub-pixel in the second display region, and a third opening without overlapping the first pixel and the second pixel; and a touch wire disposed in the first display region and the second display region, and surrounding the first, second, and third openings.