Force Sensor Backlight Adjustment for LCD Stress Leakage

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Solution Overview

Problem

Mechanical structures in display devices can cause improper functioning and lead to light leakage or optical artifacts due to stress distribution, especially in thin and delicate LCD panels.

Innovation Solution

Incorporating force sensors between the display cover and the LCD panel to detect stress distribution and adjust the backlight levels accordingly, using a control system to process signals from these sensors and adjust the displayed pattern or brightness to mitigate stress-induced issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If mechanical structures (display cover) are used to protect the display, then the display is protected from damage, but stress distribution causes light leakage and optical artifacts

Engineering Contradiction:

Improvedisplay protectionVSAvoidlight leakage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where force sensors detect stress distribution on the display panel, and this information is fed back to a control system that adjusts backlight intensity in real-time. When stress is detected in specific regions, the system automatically reduces backlight intensity in those areas to prevent light leakage, thus resolving the contradiction between mechanical protection and optical quality.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes the backlight intensity parameter based on detected stress conditions. By adjusting the backlight intensity parameter in response to mechanical stress, the system maintains display quality despite the presence of protective mechanical structures that cause stress distribution.

Inventive Principle:

Principle #35Parameter changes

2Length of moving object

If the display panel is made thinner and more delicate, then the display quality is improved, but the panel becomes more susceptible to stress-induced light leakage

Engineering Contradiction:

Improvepanel thicknessVSAvoidoptical artifacts

Core Design Contradiction:

Length of moving objectVSObject-affected harmful factors

Solution Approach 1:

Force sensors continuously monitor stress on the thin display panel and provide feedback to the control system. When stress is detected that would cause light leakage or optical artifacts, the system responds by adjusting backlight intensity in the affected regions, thereby maintaining display quality despite the panel's thin and delicate construction.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces mechanical stress management approaches with an optical compensation system. Instead of trying to mechanically eliminate stress on the thin panel, the system uses sensors and dynamic backlight control to compensate for the optical effects of stress, allowing thin panel design without suffering from stress-induced defects.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-affected harmful factors

If force sensors are added to detect stress distribution, then light leakage can be mitigated, but device complexity increases

Engineering Contradiction:

Improvelight leakage controlVSAvoidsensor system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent introduces force sensors as intermediary devices between the mechanical structure and the optical system. These sensors act as mediators that detect stress conditions and enable the control system to make informed adjustments to the backlight, providing a bridge between mechanical stress and optical compensation without requiring complex direct intervention.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Prevents customer complaints related to light leakage in low-light environments by effectively managing stress distribution, reducing undesired optical artifacts, and maintaining display quality.

Implementation Method 1

these force sensors, such as force gauges or strain gauges, can be placed between the cover and the LCD panel or other display device, to obtain the stress distribution that the cover applies around edges of the LCD panel/display device

Methodology Applied

Scientific EffectStress distribution detection:

Implementation Method 2

A control device, such as a controller board or other suitable component, receives and processes the signals from force sensors. The stress distribution data is output to a graphics controller that is configured to adjust a displayed pattern or brightness

Methodology Applied

Scientific EffectLight intensity modulation:

Data Source

PatentUS10859872B2Method to utilize force sensors to adjust the LCD pattern or brightness on a display

Publication Date: 2020.12.08 DELL PROD LP

AI summary

A system comprising a display, a display cover, a plurality of sensors disposed between the display and the display cover and a lighting control system coupled to the display and the plurality of sensors, the lighting control system configured to receive one or more signals from the plurality of sensors and to reduce a backlight level of a subgroup of lighting elements associated with the one or more sensors associated with the one or more signals, wherein the subgroup of lighting elements is one of a plurality of subgroups of lighting elements of the display.