Display Substrate With High Transmittance Region For Under-Screen Sensors

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Solution Overview

Problem

The increasing demand for high screen-to-body ratio in display products requires sensors to be integrated within the display region, necessitating an area with high transmittance that can also be used for displaying.

Innovation Solution

A display substrate with a base substrate featuring a first display region and a second display region, where the first display region has higher light transmittance than the second display region, and includes a pixel circuit with a storage capacitor, driving transistor, and sub-circuits for data writing, reset, and luminescent control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If sensors are arranged in the display region to achieve high screen-to-body ratio, then the screen-to-body ratio is improved, but the light transmittance of the display region is reduced

Engineering Contradiction:

Improvescreen-to-body ratioVSAvoidlight transmittance

Core Design Contradiction:

Length of moving objectVSIllumination intensity

Solution Approach 1:

The display substrate is divided into two distinct display regions: a first display region with high light transmittance for sensor integration and a second display region with lower light transmittance for standard display functions. This local differentiation allows each region to optimize its specific function while maintaining overall system performance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The display region is segmented into multiple functional zones with different optical characteristics. The first display region (with higher transmittance) and second display region (with lower transmittance) are spatially separated and independently controlled through different pixel circuit configurations, enabling simultaneous optimization of sensor integration and display quality.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the first display region has high light transmittance for sensor integration, then sensor functionality is enabled, but the display performance in that region is reduced

Engineering Contradiction:

Improvesensor integration capabilityVSAvoiddisplay performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

Different pixel circuit configurations are applied to different display regions. The first pixel circuits in the high-transmittance region use optimized transistor arrangements (including oxide transistors with lower leakage current) and capacitor configurations that maintain acceptable display performance while prioritizing light transmission for sensor operation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The pixel circuits are segmented into different types: first pixel circuits for the high-transmittance display region and second pixel circuits for the standard display region. Each circuit type is independently designed and optimized for its specific functional requirements, allowing the high-transmittance region to achieve sensor integration while maintaining sufficient display capability.

Inventive Principle:

Principle #1Segmentation

3Reliability

If more pixel circuit components are added to improve display performance, then display quality is improved, but the area occupied by the pixel circuit increases

Engineering Contradiction:

Improvedisplay performanceVSAvoidpixel circuit area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The pixel circuit layout utilizes three-dimensional spatial arrangement and overlapping projections. The light emitting device electrode projection covers the pixel circuit projection, allowing circuit components to be positioned beneath the light emitting structure. This vertical stacking and overlapping approach reduces the horizontal footprint of the pixel circuit while maintaining complete circuit functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The pixel circuit components are nested within the projection area of the light emitting device electrode. By placing transistors, capacitors, and interconnects beneath the light emitting structure, the circuit elements are effectively hidden within the overall pixel footprint, minimizing the visible circuit area while preserving full circuit functionality.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS12236858B2Display substrate and display apparatus having display regions with different light transmittance

Publication Date: 2025.02.25 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A display substrate and a display apparatus are disclosed. The display substrate includes: a base substrate including a first and second display regions; a light transmittance of the first display region is greater than that of the second display region; first sub-pixels in the first display region. At least one first sub-pixel includes a first pixel circuit and a first light emitting device; the first pixel circuit includes a storage capacitor and a driving transistor; and a data writing sub-circuit configured to write a data voltage signal to a gate electrode of the driving transistor in response to a first and second scan signals; a reset sub-circuit configured to provide an initialization voltage signal to a first electrode of the first light emitting device in response to the second scan signal; and a luminescent control sub-circuit configured to transmit a driving current to the first light emitting device.