Flexible Display Substrate Color Filter for Under-Screen White Balance

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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, affecting imaging quality.

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 adjust and balance the incident light, thereby optimizing white balance and improving imaging quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a flexible OLED display substrate made of polyimide (PI) material is used, then flexibility and display performance are improved, but blue light absorption increases causing yellow imaging and impaired white balance

Engineering Contradiction:
ImproveflexibilityVSAvoidblue light absorption
Core Design Contradiction:
Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful blue light absorption property of the PI material into a beneficial feature by adding a color filter layer with blue filter units in the light-transmissive region. This layer compensates for the absorbed blue light, transforming the deficiency into a balanced white light output for the off-screen camera.

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

Solution Approach 2:

The patent applies different color filter configurations to different regions: the display region uses conventional RGB filter units matching the light-emitting units, while the light-transmissive region specifically uses blue filter units (or RGB with greater blue area) to compensate for the PI material's blue light absorption in that specific area.

Inventive Principle:
Principle #3Local quality

2Reliability

If the color filter layer includes blue filter units with greater total area than red and green filter units in the light-transmissive region, then white balance is optimized, but device complexity increases

Engineering Contradiction:
Improvewhite balanceVSAvoidcolor filter layer complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The color filter layer serves dual functions: in the display region, it performs conventional color filtering for display quality; in the light-transmissive region, it compensates for blue light absorption to enable accurate white balance for the off-screen camera, making a single layer structure perform multiple functions.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the area parameters of the filter units by making the blue filter units have a greater total area than the red and green filter units in the light-transmissive region, specifically adjusting this geometric parameter to compensate for the PI material's spectral absorption characteristics.

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

The solution effectively adjusts the light color to optimize white balance and enhance imaging quality by increasing the blue light intensity entering the photosensitive element, thus improving the overall imaging performance.

Implementation Method 1

The color filter layer is disposed on a light exit side of the display structure layer and the at least one light-transmissive region. The color filter layer of the at least one light-transmissive region includes a plurality of blue filter units; or, the 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

Methodology Applied
Scientific EffectLight transmission and filtering: Filter (optical)

Implementation Method 2

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

Methodology Applied
Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12501820B2Display substrate and preparation method therefor, and display device
Publication Date: 2025.12.16 CHENGDU BOE OPTOELECTRONICS TECH CO LTD
  • US12501820B2 patent drawing
  • US12501820B2 patent drawing
  • US12501820B2 patent drawing

AI summary

A display substrate, including: a flexible base substrate, a display structure layer, and a color filter layer. The flexible base substrate comprises: a first display region. The first display region comprises: at least one sub-display region and at least one light-transmissive region. The display structure layer comprises 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 comprises 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.