Display Panel Sensor Shielding Against Stray Light Interference

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Solution Overview

Problem

Stray light irradiation affects the sensor's ability to sense images in display devices, particularly when a sensor is integrated into the display panel.

Innovation Solution

Incorporating a light-shielding element between the substrates of the display panel, which surrounds and extends beyond the sensor, to block stray light effectively, with the height of the light-shielding element being greater than or equal to the sensor's height, thereby reducing the influence of stray light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a sensor is disposed in the display panel, then the sensor can sense images, but the sensor is readily irradiated by stray light, thus affecting the sensor sensing an image

Engineering Contradiction:

Improvesensor sensing accuracyVSAvoidstray light irradiation

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A light-shielding element is introduced as an intermediary component between the backlight module and the sensor. This light-shielding element includes a light-shielding plate and a light-shielding side wall that extend between the sensor and the backlight module, effectively blocking stray light from reaching the sensor while allowing the sensor to function normally

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light-shielding element is segmented into multiple functional parts: a light-shielding plate positioned at the bottom of the sensor, and light-shielding side walls extending upward from the light-shielding plate. This segmentation allows the light-shielding element to block stray light from multiple directions (below and from the sides) while minimizing impact on the sensor's normal operation

Inventive Principle:

Principle #1Segmentation

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 light-shielding element significantly reduces the impact of stray light on the sensor, enhancing the sensor's ability to accurately detect images by blocking stray light from both above and below.

Implementation Method 1

a light-shielding element... to block stray light effectively, with the height of the light-shielding element being greater than or equal to the sensor's height, thereby reducing the influence of stray light

Methodology Applied

Scientific EffectLight blocking/absorption: Absorption (EM radiation)

Data Source

PatentUS11789326B2Display device

Publication Date: 2023.10.17 INNOLUX CORP

AI summary

A display device includes a backlight module and a display panel. The display panel is disposed on the backlight module and includes two substrates, a sensor, and a light-shielding element. The sensor is disposed between the two substrates. The light-shielding element at least partially surrounds the sensor. A height of the light-shielding element is greater than a height of the sensor.