Display Driver System with Embedded Non-Volatile Memory for Luminance Correction

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Solution Overview

Problem

OLED displays often suffer from mura, or uneven luminance, due to pixel-to-pixel variations, which affect the visual experience and require complex memory systems for correction.

Innovation Solution

Incorporating a non-volatile memory array and a luminance adjusting circuit within the display driver system to store and adjust luminance data, reducing the need for external memory interfaces and improving data retention and power efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external memory interfaces and complex memory systems are used to correct luminance unevenness, then luminance correction capability is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improveluminance correction capabilityVSAvoidmemory system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the non-volatile memory array directly with the display driver circuitry, integrating luminance correction functionality into the driver itself. This eliminates the need for separate external memory interfaces and complex memory systems, while maintaining the capability to store and apply luminance correction data for OLED display uniformity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display driver is designed to perform multiple functions: driving the OLED display and simultaneously storing luminance correction data in its integrated non-volatile memory. This multi-functional approach eliminates the need for dedicated external memory components, reducing overall system complexity while maintaining correction capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Duration of action of stationary object

If external memory interfaces are used for luminance data storage, then data retention is improved, but power consumption increases

Engineering Contradiction:

Improvedata retentionVSAvoidpower consumption

Core Design Contradiction:

Duration of action of stationary objectVSUse of energy by stationary object

Solution Approach 1:

The non-volatile memory array is integrated directly into the display driver, eliminating the need for external memory interfaces. This integration reduces power consumption by removing interface overhead while maintaining non-volatile data retention capability for luminance correction data

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display driver serves itself by incorporating non-volatile memory within its own structure, allowing it to store and retrieve luminance correction data without requiring external memory components. This self-sufficient design reduces power consumption by eliminating external interface operations while maintaining data retention

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12142241B2Display driver system with embedded non-volatile memory

Publication Date: 2024.11.12 HEFEI RELIANCE MEMORY LTD

AI summary

Circuitry for adjusting luminance of a display device is provided. The circuitry includes a non-volatile memory array having a plurality memory cells configured to store luminance data of the display device, and a luminance adjusting circuit configured to receive image data to be displayed on the display device. The luminance adjusting circuit is coupled directly to the non-volatile memory array to receive the luminance data of the display device from the non-volatile memory array and adjust the image data based on the luminance data of the display device.