Display Power Saving via Luma Amplification and Reference Curve Mapping

Solution Overview

Problem

Display devices face challenges in reducing power consumption while maintaining display quality, as lowering light source brightness can lead to light leakage and uneven brightness distribution, affecting the quality of displayed frames.

Innovation Solution

A power-saving method that amplifies luma values for pixel units, allowing a lower light source brightness to reduce power consumption while maintaining frame quality by using a reference curve to map original data luma values to power-saving data luma values and drive values, thereby controlling the light source's power usage effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If the brightness of the light source is reduced to save power, then power consumption is lowered, but light leakage occurs and brightness distribution becomes uneven

Engineering Contradiction:

Improvepower consumptionVSAvoidlight leakage

Core Design Contradiction:

Use of energy by stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the luma values of pixel units based on their positions and the brightness level of the light source. When the light source brightness is reduced for power saving, the controller increases the luma values of pixel units, particularly those at edges and corners, to compensate for the lower brightness and prevent light leakage, thus maintaining display quality while reducing power consumption

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If the luma values of pixel units are amplified to compensate for low light source brightness, then display quality is maintained, but power consumption increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by stationary object

Solution Approach 1:

The patent applies local quality by differentially adjusting the luma values of different pixel units based on their positions. Pixel units at edges and corners, which are more susceptible to light leakage, receive enhanced luma values, while central pixel units have their luma values adjusted less aggressively. This localized approach maintains display quality where needed while minimizing overall power consumption

Inventive Principle:

Principle #3Local quality

3Use of energy by stationary object

If the brightness of the light source is lowered to reduce power consumption, then overall power saving is achieved, but brightness distribution becomes uneven across the panel

Engineering Contradiction:

Improvepower consumptionVSAvoidbrightness distribution

Core Design Contradiction:

Use of energy by stationary objectVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by differentially adjusting the luma values of different pixel units based on their positions. Pixel units at edges and corners, which are more susceptible to light leakage, receive enhanced luma values, while central pixel units have their luma values adjusted less aggressively. This localized approach maintains display quality where needed while minimizing overall power consumption

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9093037B2Method and associated apparatus for power-saving display

Publication Date: 2015.07.28 MEDIATEK INC

AI summary

A method for power saving of display devices is provided. The method includes: while displaying a frame on a display, providing a representative data luma according to a plurality of original data lumas of a plurality of pixels of the frame, mapping a representative data luma value of a frame and a corresponding original drive value to a target display luma value according to the display characteristic, providing a power-saving data luma and a power-saving drive by mapping the target display value to a reference curve to display the frame.