Embedded Non-Volatile Memory for Display Driver Mura Correction
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Solution Overview
Problem
Display devices, particularly OLEDs, suffer from mura effects due to pixel-to-pixel luminance variations, which cause visual unevenness, and existing solutions require complex memory structures with high power consumption and large form factors.
Innovation Solution
Integration of a non-volatile memory array and a luminance adjusting circuit within a unified controller to directly store and adjust luminance data, eliminating external interfaces and reducing complexity, while using low-power, fast-programmable memory technologies like resistive random access memory (RRAM) to correct mura effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external flash memory and SRAM are used to store luminance data, then the display system can correct mura effects, but the form factor increases and power consumption rises
Solution Approach 1:
The patent combines the flash memory and SRAM into a single integrated non-volatile memory structure within the display driver. This merging eliminates the need for separate external memory components, thereby reducing the overall form factor while maintaining the dual functionality of storing both luminance data and correction data necessary for mura effect correction.
Solution Approach 2:
The integrated non-volatile memory is designed to serve multiple functions: storing luminance data, storing correction data, and providing both volatile and non-volatile storage capabilities. This multi-functionality allows the single memory structure to replace multiple separate components, reducing the form factor while maintaining full mura correction capability.
2Reliability
If external flash memory and SRAM are used to store luminance data, then the display system can correct mura effects, but power consumption increases
Solution Approach 1:
The patent merges flash memory and SRAM into a single non-volatile memory structure that reduces overall power consumption. By eliminating the need for separate memory components and their associated control circuits, the integrated structure reduces static and dynamic power consumption while maintaining the ability to store and retrieve luminance and correction data for mura effect correction.
3Reliability
If complex memory structures with external interfaces are used, then luminance data can be stored and retrieved, but device complexity increases
Solution Approach 1:
The patent combines multiple memory functions into a single integrated non-volatile memory structure with a unified control interface. This merging eliminates the need for complex external interfaces and multiple control circuits, thereby reducing device complexity while maintaining the capability to store and retrieve luminance data and correction data.
Solution Approach 2:
The integrated memory structure is designed to perform multiple memory functions (volatile storage, non-volatile storage, luminance data storage, correction data storage) through a single unified interface. This multi-functionality simplifies the overall device architecture by eliminating the need for multiple specialized interfaces and control circuits.
Data Source
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.