RGBW OLED Display Data Compression for Luminance Control
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Solution Overview
Problem
Conventional RGBW OLED displays do not achieve maximum luminance as they need to convert one of the RGBW data values to '0' to store data in frame memory, resulting in simultaneous light emission issues.
Innovation Solution
A method and device that modulate RGB data based on luminance increase gain set by chroma, substitute W data for common components, and encode RGBW data to reduce bit number, using marking bits to check for '0' values, allowing for improved luminance control and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If one of the RGBW data values is converted to '0' for frame memory storage, then the data storage capacity is improved, but the luminance emission is deteriorated
Solution Approach 1:
The patent segments the 40-bit RGBW data into multiple groups and selectively converts only certain segments to '0' based on image characteristics, rather than converting all data to '0'. This allows partial data compression while maintaining luminance in other segments. The frame memory stores both the compressed data and conversion status information, enabling reconstruction of the original luminance data during display.
Solution Approach 2:
The patent dynamically changes the data conversion parameter based on image characteristics such as luminance and chroma. When the image has high luminance requirements, fewer data values are converted to '0'. When luminance requirements are lower, more conversions are performed. This adaptive parameter adjustment resolves the contradiction by making the conversion ratio variable rather than fixed.
2Quantity of substance
If RGBW data is stored in frame memory with 32 bits per pixel, then the memory bandwidth is reduced, but the simultaneous light emission of all sub-pixels is compromised
Solution Approach 1:
The patent introduces an intermediary conversion status register that stores information about which RGBW data values were converted to '0'. This intermediary structure acts as a bridge between the compressed frame memory and the display driver, allowing the system to retrieve and reconstruct the original non-zero values during the display phase, ensuring all sub-pixels can emit light simultaneously despite the compressed storage format.
Solution Approach 2:
The patent performs preliminary data conversion and compression before storing in frame memory, and prepares the conversion status information in advance. During display, the system uses the pre-prepared status information to quickly reconstruct the original data values, ensuring that all sub-pixels receive their required data simultaneously. This preliminary preparation eliminates the need for sequential data retrieval that would compromise simultaneous light emission.
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
Enhances luminance by optimizing data storage and emission in RGBW OLED displays, reducing power consumption and IC heat emission while maintaining high-frequency operation.
Implementation Method 1
An organic electroluminescent (EL) device used for an organic EL display is a spontaneous emission device having an emission layer formed between two electrodes. The organic EL device emits light in a manner in which electrons and holes are respectively injected into the emission layer from a cathode and an anode and combined to generate excitons. Light is emitted when an exciton drops from an excited state to a lower energy state.
Data Source
AI summary
Disclosed is a driving method of a display device that includes, for example, setting a luminance increase gain based on a chroma of an RGB data of an input image; modulating the RGB data of the input image based on the luminance increase gain to generate an RGB data of a first image; substituting a W data for common components of the RGB data of the first image and converting the RGB data of the first image to an RGBW data of a second image; and encoding the RGBW data of the second image into an RGBW data of a third image such that a number of bits of the RGBW data of the third image is less than a number of bits of the RGBW data of the second image.