OLED Driver IC Memory Segmentation for Brightness Correction
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Solution Overview
Problem
Current driver ICs for displays face challenges in managing brightness unevenness across pixels due to manufacturing issues and degradation, leading to increased chip size and cost, especially when requiring large-capacity memory for unevenness correction, and the development of multiple IC types for different functionalities is costly and inefficient.
Innovation Solution
A driver IC with a selectively usable memory for either unevenness correction or display memory functions, allowing the chip size to remain unaffected and enabling the selection of functions based on usage, incorporating a switch to allocate memory resources accordingly and using data compression for efficient correction data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large-capacity memory is provided in the driver IC for unevenness correction, then brightness unevenness correction capability is improved, but chip size increases
Solution Approach 1:
The memory is divided into two banks: a first bank for storing correction data and a second bank for storing display data. This segmentation allows the driver IC to handle unevenness correction without requiring a single large-capacity memory, thereby reducing chip size while maintaining correction capability.
Solution Approach 2:
The same memory structure serves dual purposes: correcting brightness unevenness and storing display data. By making the memory multi-functional, the driver IC eliminates the need for separate large-capacity memory dedicated solely to correction data, thus reducing overall chip size.
2Adaptability or versatility
If multiple IC types are developed for different functionalities, then functional versatility is improved, but development cost increases
Solution Approach 1:
The driver IC is designed with a reconfigurable memory system that can function as either a correction data storage bank or a display data storage bank. This multi-functionality allows a single IC design to serve multiple purposes (unevenness correction and display memory), eliminating the need to develop and manufacture multiple separate IC types, thereby reducing development costs.
Solution Approach 2:
The memory banks can be dynamically configured or selected based on the operational needs of the display system. The driver IC can switch between using the first bank for correction data and the second bank for display data, or vice versa, providing functional versatility without requiring multiple fixed-function IC designs.
Data Source
AI summary
An OLED display having a correction circuit for producing corrected image data in response to the first image data and in response to correction data to correct for brightness unevenness due to TFT variations; a memory for storing first image data or correction data; a switch effective in first and second states in response to a function switching signal having first and second conditions, respectively; and circuitry for causing the switch to be in the first state to connect the memory to the image input signal interface and to provide the stored first image data to the panel as the second image data; and for causing the switch to be in the second state to connect the memory to the correction circuit, provide the stored correction data to the correction circuit, and provide the corrected image data to the panel as the second image data.