Organic Light Emitting Display Frame Memory Segmentation
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Solution Overview
Problem
Conventional organic light emitting displays face challenges in displaying uniform images due to deviations in threshold voltage and mobility of drive transistors, limiting their ability to display a wide range of grey levels and causing contour noise.
Innovation Solution
The implementation of a digital driving method that uses a frame memory with a read clock of higher frequency than the write clock, along with a data driver and scan driver, to supply data signals to pixels in a way that optimizes light emission times and reduces the number of scan signals required, thereby improving grey level display and minimizing contour noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed voltage is stored in the storage capacity to display grey levels for all pixels, then the driving circuit is simple, but the image uniformity deteriorates due to deviation in threshold voltage and mobility of drive transistors
Solution Approach 1:
The patent segments the frame memory into multiple buffer regions (first buffer region and second buffer region) to store data for different scan lines separately. This segmentation allows different data to be supplied to different regions, compensating for transistor variations and achieving uniform image display across all pixels.
2Productivity
If the read clock frequency is increased to improve data supply speed, then the productivity improves, but the device complexity increases due to clock synchronization requirements
Solution Approach 1:
The patent uses a frame memory to preliminarily store and buffer the data before it is supplied to the pixels. By pre-storing data in the frame memory with different buffer regions, the system can supply data at higher speeds without requiring complex real-time clock synchronization circuits, as the buffering action has already been performed in advance.
3Productivity
If data for multiple scan lines is supplied simultaneously, then the productivity improves, but the manufacturing precision deteriorates due to difficulty in managing data for different regions
Solution Approach 1:
The frame memory is segmented into multiple buffer regions, with each region dedicated to storing data for specific scan lines. This segmentation enables simultaneous data supply to multiple scan lines while maintaining precise control over the data for each region, ensuring that data management accuracy is not compromised by the increased productivity.
4Manufacturing precision
If the light emission period is extended to improve grey level display, then the image quality improves, but the duration of action of other components must be increased
Solution Approach 1:
The frame memory preliminarily stores and prepares the data for all scan lines before the actual display period. By performing the data preparation action in advance during the buffering phase, the system can extend the light emission period for improved grey level display without requiring other components to operate for excessively long durations, as the preparatory work has already been completed.
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
This approach enables the organic light emitting display to achieve uniform luminance and improved grey level display quality by maximizing light emission periods and reducing contour noise, while also simplifying circuit design by eliminating the need for complex clock synchronization circuits.
Implementation Method 1
the organic light emitting diodes generate the light through recombination of electrons and holes
Data Source
AI summary
Disclosed is an organic light emitting display of improved an image quality. The organic light emitting display includes a frame memory for storing a data to correspond to a write clock and outputting the data stored according to a read clock; a signal generation unit for supplying the read clock; a data driver for converting the data, supplied from the frame memory, into a data signal and supplying the converted data signal to data lines; a scan driver for supplying a scan signal to scan lines; and pixels arranged near crossing points between the scan lines and the data lines, wherein the read clock has a higher frequency than the write clock.