Display Device Light Source Selection Circuit Power Management

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Solution Overview

Problem

Existing color liquid crystal display devices face a trade-off between image luminance and power consumption, as increasing luminance to enhance image brightness leads to higher power consumption.

Innovation Solution

A display device configuration with multiple memories per pixel, a light source selection circuit, and a light guide plate, where the light source is kept on for the entire display period, allowing for extended image display times without constant light source activation, thereby reducing power usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the luminance of the light source is increased to increase image luminance, then image brightness is improved, but power consumption increases

Engineering Contradiction:

Improveimage luminanceVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The light source is activated in advance during the writing period before the display period begins. This preliminary action ensures that light is already available when pixel data is being written to the memory, eliminating the need to extend light source operation into the display period and thereby reducing overall power consumption while maintaining image luminance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The light source operates continuously during the writing period without interruption, ensuring that light emission is synchronized with the data writing process. This continuous operation during the critical writing phase eliminates the need for additional light source activation during the display period, optimizing power usage while maintaining display performance

Inventive Principle:

Principle #20Continuity of useful action

2Productivity

If one half or one quarter of each display period is allocated for electrical writing, then data can be written to memory, but the light source cannot illuminate during this period, causing image luminance to decrease

Engineering Contradiction:

Improvedata writing capabilityVSAvoidimage luminance

Core Design Contradiction:

ProductivityVSIllumination intensity

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The display operation is divided into distinct periodic phases: a writing period where data is written to memory with light source activation, and a display period where the stored data is displayed. This periodic structure allows the light source to be turned off during the display period after writing is complete, reducing power consumption while maintaining image luminance during the display phase

Inventive Principle:

Principle #19Periodic action

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

This configuration maintains high image luminance while minimizing power consumption by ensuring the light source is only active when necessary, optimizing display performance.

Implementation Method 1

a light guide plate configured to guide, to the display area, the light emitted from the light source selected from the light sources

Methodology Applied

Scientific EffectLight guidance: Waveguide (optics)

Data Source

PatentUS10621927B2Display device

Publication Date: 2020.04.14 MAGNOLIA WHITE CORP

AI summary

A display device includes: pixels arranged in a row direction and in a column direction in a display area, each pixel including a memory block including memories; memory selection line groups each including memory selection lines electrically coupled to the memory block of each of the pixels belonging to a corresponding row; a memory selection circuit that simultaneously outputs a memory selection signal to the memory selection line groups; light sources; a light source selection circuit that selects which light source is to be used; and a light guide plate that guides the light emitted from selected light source to the display area. One of the memories is selected, and each pixel displays an image based on pixel data being stored in the selected memory. The light source selected by the light source selection circuit emits light over an entire period of time in which the one memory is selected.