Liquid Crystal Display Heating Sheet for Response Time

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Solution Overview

Problem

Liquid crystal displays using edge type backlight units face challenges in heat transfer, resulting in lower surface temperatures and degraded response characteristics, leading to longer motion picture response time and 3D crosstalk issues.

Innovation Solution

Incorporating a heat generation sheet between the backlight unit and the bottom cover, which generates radiant heat and increases the surface temperature of the liquid crystal display panel, improving the response characteristics by transferring heat through the reflection sheet, light guide plate, and optical sheets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If edge type backlight unit is used, then thin profile is achieved, but heat transfer to liquid crystal panel surface is insufficient

Engineering Contradiction:

Improveprofile thicknessVSAvoidsurface temperature of liquid crystal panel

Core Design Contradiction:

Length of moving objectVSTemperature

Solution Approach 1:

A heating element is introduced as an intermediary component between the backlight unit and the liquid crystal panel. This heating element converts electrical energy to thermal energy, directly heating the liquid crystal panel to improve response characteristics without compromising the thin profile achieved by the edge type backlight unit.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces passive thermal conduction methods with active electrical heating. Instead of relying on heat to naturally travel from the backlight unit through multiple layers, an electrical heating element is used to generate heat directly where needed, substituting the mechanical/thermal conduction process with an electrical-to-thermal conversion process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If surface temperature of liquid crystal panel is increased to improve response characteristic, then Ton/Toff characteristics are improved, but motion picture response time lengthens and 3D crosstalk appears

Engineering Contradiction:

Improveresponse characteristic of liquid crystalsVSAvoidmotion blur and 3D crosstalk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the temperature parameter of the liquid crystal panel to improve response characteristics. By controlling the heating element to maintain an optimal temperature range, the patent enhances Ton/Toff characteristics while avoiding excessive temperature increases that would cause motion blur and 3D crosstalk.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If direct type backlight unit is used, then heat transfer to liquid crystal panel is effective, but interval between diffusion plate and light sources is necessary and cost increases

Engineering Contradiction:

Improvesurface temperature of liquid crystal panelVSAvoidstructural complexity and cost

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent extracts the heating function from the backlight unit structure itself and separates it as an independent heating element. This allows the backlight unit to maintain its edge type design with minimal structural complexity while the separate heating element provides the necessary thermal input to the liquid crystal panel without requiring the complex interval structure of direct type backlight units.

Inventive Principle:

Principle #2Taking out (Extraction)

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 heat generation sheet significantly improves the motion picture response time and reduces 3D crosstalk by increasing the surface temperature of the liquid crystal display panel, enhancing the display quality without the technical difficulties and cost burdens associated with other methods.

Implementation Method 1

at least one heat generation sheet disposed between the backlight unit and the bottom cover, the at least one heat generation sheet configured to generate a radiant heat for increasing a surface temperature of the liquid crystal display panel

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

the at least one heat generation sheet configured to generate a radiant heat for increasing a surface temperature of the liquid crystal display panel

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 3

transferring heat through the reflection sheet, light guide plate, and optical sheets

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8441608B2Liquid crystal display including heating element between bottom cover and backlight unit

Publication Date: 2013.05.14 LG DISPLAY CO LTD

AI summary

A liquid crystal display includes a liquid crystal display panel, a backlight unit providing light to the liquid crystal display panel, a bottom cover receiving the backlight unit, and at least one heat generation sheet disposed between the backlight unit and the bottom cover. The at least one heat generation sheet generates a radiant heat for increasing a surface temperature of the liquid crystal display panel.