LCD Pixel Memory Refresh Circuit for Low-Power Flicker Control

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Solution Overview

Problem

Power consumption for refresh operations is high in known memory-type liquid crystal display devices.

Innovation Solution

The liquid crystal display device incorporates a pixel configuration with first and second memory circuits, a display circuit, and a refresh circuit that reads and writes back memory data, utilizing a control circuit to manage power sources and transistors to reduce power consumption and flicker.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If memory display is performed in a known liquid crystal display device, then power consumption is reduced, but power consumption required for refresh becomes large

Engineering Contradiction:

Improvepower consumptionVSAvoidpower consumption for refresh

Core Design Contradiction:

Loss of energyVSUse of energy by stationary object

Solution Approach 1:

The pixel is divided into two separate memory circuits (first memory circuit and second memory circuit) instead of using a single memory circuit. This segmentation allows the refresh operation to be performed on only one memory circuit at a time, thereby reducing the overall power consumption required for refresh while maintaining the memory display function.

Inventive Principle:

Principle #1Segmentation

2Reliability

If refresh operation is performed frequently, then display quality is improved, but power consumption increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The refresh operation is performed periodically by alternating between the first and second memory circuits. During each refresh cycle, one memory circuit is refreshed while the other maintains the display data, and vice versa in the next cycle. This periodic action ensures display quality is maintained while distributing the power consumption over time, reducing peak power requirements.

Inventive Principle:

Principle #19Periodic action

3Stability of the object's composition

If memory data is read and written back continuously, then display stability is maintained, but power consumption increases

Engineering Contradiction:

Improvedisplay stabilityVSAvoidpower consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by stationary object

Solution Approach 1:

Data is pre-loaded into the second memory circuit while the first memory circuit undergoes refresh operation, and vice versa. This preliminary action ensures that when one memory circuit needs refreshing, the other already contains valid display data ready to take over, maintaining display stability without requiring continuous simultaneous operation of both circuits.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260051300A1Liquid crystal display device

Publication Date: 2026.02.19 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A liquid crystal display device includes a pixel including a first memory circuit, a second memory circuit, and a display circuit including a liquid crystal capacitance and connected to the first memory circuit and the second memory circuit, a first power source line and a second power source line each connected to the display circuit, a refresh circuit for reading memory data stored in the first memory circuit and writing back the memory data to the first memory circuit in accordance with a result of the reading, and a control circuit for controlling the refresh circuit.