OLED Data Charging via Comparison Unit and Charge Control
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Solution Overview
Problem
Large organic light emitting displays with high resolution and high driving frequency face reduced data charging times, leading to inadequate image brightness.
Innovation Solution
An organic light emitting display system that includes pixels at crossing regions of scan and data lines, a comparison unit to synchronize data signals, and charge units that control current supply based on gray level comparisons, using additional power sources to optimize charging within desired time frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic light emitting display has a large panel size, high resolution, and/or high driving frequency, then the display quality and performance are improved, but the data charging time of each pixel is reduced so that desired image brightness cannot be displayed
Solution Approach 1:
The patent applies preliminary action by comparing the current data signal with the previous data signal before the pixel charging process begins. The comparison unit determines in advance whether the gray level needs to be increased, decreased, or maintained, and pre-configures the charge unit accordingly. This allows the charge unit to be ready to source or sink current immediately when the scan signal activates the pixel, eliminating delays and ensuring sufficient charging time even in high-resolution, high-frequency displays.
Solution Approach 2:
The patent implements feedback by using the comparison result between current and previous data signals to dynamically control the charge unit's operation. The comparison unit provides real-time feedback about the required gray level change, and the charge unit adjusts its current supply accordingly. This closed-loop control ensures that each pixel receives the precise amount of charge needed within the available time, maintaining image brightness despite reduced charging windows in high-performance displays.
2Productivity
If the data charging time is reduced due to large panel size, high resolution, and/or high driving frequency, then the display performance is improved, but the image brightness becomes insufficient
Solution Approach 1:
The comparison unit performs preliminary comparison of current and previous data signals to determine the required gray level adjustment before the pixel charging begins. This advance preparation allows the charge unit to be pre-configured with the correct current supply mode, ensuring that maximum charging current is applied from the moment the scan signal activates the pixel, thereby maintaining image brightness despite reduced charging time in high-performance displays.
Solution Approach 2:
The patent changes the operational parameters of the charge unit based on the comparison result. When the current data signal indicates a higher gray level than the previous signal, the charge unit is configured to source current; when it indicates a lower gray level, the charge unit sinks current; and when they are equal, the charge unit maintains the previous state. This dynamic parameter adjustment optimizes the charging process within the reduced time window, ensuring sufficient image brightness is achieved.
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 data charging time, ensuring desired image brightness by dynamically controlling voltage supply through comparison units and charge units, effectively addressing the issue of reduced charging times in high-resolution displays.
Implementation Method 1
The organic light emitting display displays images using organic light emitting diodes (OLEDs) that generate light by re-combination of electrons and holes
Data Source
AI summary
An organic light emitting display capable of improving data charging time, includes pixels at crossing regions between scan and data lines and configured to control an amount of current supplied from a first to a second power source, a charge unit adjacent to an adjacent pixel of the pixels and coupled to the same data line as the adjacent pixel, a scan driver for supplying scan signals to the scan lines, a data driver for supplying data signals to the data lines in synchronization with the scan signals, and a comparison unit in a channel of the data driver to compare a data signal supplied to a current line with a data signal supplied to a previous line and to control coupling between the charge unit and the data line according to a comparison result in a partial period of a period in which the scan signals are supplied.