Flexible OLED Display Substrate With Blue-Filter Camera Regions

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Solution Overview

Problem

Flexible OLED display substrates made of polyimide (PI) materials absorb significant amounts of blue light, leading to yellow imaging and impaired white balance during camera shooting due to the low proportion of blue light intensity entering off-screen camera devices.

Innovation Solution

Incorporating a color filter layer with a higher proportion of blue filter units in the light-transmissive regions of the display substrate, where the total area of blue filter units exceeds that of red and green filter units, to balance the light color and improve imaging quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a polyimide (PI) flexible substrate is used for OLED display, then flexibility and manufacturing ease are improved, but blue light absorption increases causing yellow imaging and poor white balance

Engineering Contradiction:

ImproveflexibilityVSAvoidblue light absorption

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

A color filter layer is introduced as an intermediary component between the PI substrate and the light-emitting layer. This color filter layer contains blue filter units that compensate for the blue light absorbed by the PI substrate, allowing the flexible substrate to maintain its flexibility while correcting the color balance issue through the intermediary filtering function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies color filter units with specific spectral transmission characteristics to counteract the yellowing effect. By incorporating blue filter units that transmit blue light with higher transmission rates, the overall color output is adjusted to achieve accurate white balance, directly addressing the color change problem caused by PI substrate absorption.

Inventive Principle:

Principle #32Color changes

2Manufacturing precision

If the color filter layer includes blue filter units with higher proportion in light-transmissive regions, then white balance is improved, but device complexity increases

Engineering Contradiction:

Improvewhite balanceVSAvoidcolor filter structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The color filter layer is designed with different configurations in different regions: the light-emitting regions contain conventional color filters matching the OLED emission, while the light-transmissive regions contain blue filter units with higher proportion to compensate for PI substrate absorption. This local differentiation achieves accurate white balance in camera regions without affecting display regions, managing complexity through spatial specialization.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The color filter layer serves multiple functions: it acts as a conventional color filter in display regions to enable color emission, and simultaneously serves as a white balance correction layer in camera regions by transmitting blue light. This multi-functionality reduces the need for separate correction components, managing overall device complexity while achieving manufacturing precision.

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 optimizes white balance and enhances imaging quality by adjusting the light color entering photosensitive elements, effectively mitigating the yellow tint caused by PI substrate absorption.

Implementation Method 1

The color filter layer of the at least one light-transmissive region includes a plurality of blue filter units

Methodology Applied

Scientific EffectOptical filtration: Filter (optical)

Implementation Method 2

Flexible OLED display substrates made of polyimide (PI) materials absorb significant amounts of blue light

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20260047332A1Display substrate and preparation method therefor, and display device

Publication Date: 2026.02.12 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A display substrate, including: a flexible base substrate, a display structure layer, and a color filter layer. The flexible base substrate includes: a first display region. The first display region includes: at least one sub-display region and at least one light-transmissive region. The display structure layer includes a plurality of first light-emitting units disposed on a flexible base substrate of the sub-display region. The color filter layer is arranged on a light exit side of the display structure layer and the at least one light-transmissive region. A color filter layer of the at least one light-transmissive region includes a plurality of blue filter units, or a color filter layer of the at least one light-transmissive region includes: first red filter units, first green filter units, and first blue filter units which are periodically arranged.