Display Device Power Management Circuit Shape Change Heat

Solution Overview

Problem

Existing display devices face challenges in changing their shape during image display periods without compromising image quality or causing bonding defects between components due to stress and heat generated during shape transformation.

Innovation Solution

A display device with a timing controller and data driving circuit that adjusts the luminance of sub-pixels by converting image data and outputting a data voltage, reducing luminance during shape transformation periods to minimize heat and stress, while maintaining image quality through controlled voltage levels and sub-pixel characteristic value compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display device changes shape during image display period, then the adaptability and versatility of the display device is improved, but heat is generated and bonding defects may occur between components

Engineering Contradiction:

Improveshape change capabilityVSAvoidheat generation

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements periodic action by controlling the backlight unit to operate in alternating periods: a first period where the backlight is on during normal image display, and a second period where the backlight is off during shape transformation. This periodic on/off operation reduces heat generation during shape changes while maintaining normal display functionality during stable periods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies parameter changes by dynamically adjusting the luminance of the backlight unit based on the operational state. During shape transformation, the backlight luminance is reduced or turned off, changing the physical parameter of light output to minimize heat generation while allowing shape change to occur.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the display device changes shape during image display period, then the adaptability and versatility of the display device is improved, but bonding defects between components may occur due to stress and heat

Engineering Contradiction:

Improveshape change capabilityVSAvoidbonding integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements periodic action by controlling the backlight unit to operate in alternating periods: a first period where the backlight is on during normal image display, and a second period where the backlight is off during shape transformation. This periodic on/off operation reduces heat generation during shape changes while maintaining normal display functionality during stable periods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies preliminary anti-action by proactively turning off or reducing backlight luminance before or during shape transformation, preventing excessive heat generation that would cause bonding defects. This preventive measure protects the bonding integrity between components before thermal damage can occur.

Inventive Principle:

Principle #9Preliminary anti-action

3Object-affected harmful factors

If the backlight luminance is reduced during shape transformation, then heat generation is minimized, but image quality may be affected

Engineering Contradiction:

Improveheat generationVSAvoidimage quality

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent implements periodic action by controlling the backlight unit to operate in alternating periods: a first period where the backlight is on during normal image display, and a second period where the backlight is off during shape transformation. This periodic on/off operation reduces heat generation during shape changes while maintaining normal display functionality during stable periods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies preliminary action by preparing the system to transition between states: before shape transformation, the backlight is turned off or luminance is reduced in advance, and image data is converted to account for this state. This ensures that when the display returns to normal operation, image quality is immediately restored without residual effects.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11967260B2Display device with power management circuit for transforming period

Publication Date: 2024.04.23 LG DISPLAY CO LTD

AI summary

A display device is disclosed that includes a display panel on which one or more sub-pixels including a light emitting device and a driving transistor for driving the light emitting device are disposed in a display area, and whose shape is changed during a transforming period, a timing controller for receiving image data and a command signal defining the transforming period, and converting the image data to output converted image data, and a data driving circuit for receiving the converted image data and outputting a data voltage, wherein, in the transforming period, at least one sub-pixel emits light based on the image data input to the timing controller, and emits light with a luminance lower than a luminance corresponding to a grayscale of the image data. Accordingly, there may be provided a display device capable of changing a shape during an image display period.