OLED Display Overcurrent Prevention via Image Data Modulation
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Solution Overview
Problem
Conventional OLED display devices face increased power consumption and reduced lifespan due to overcurrent generation, which complicates circuit configurations and increases production costs, as they require separate memory for frame data storage and complex frame current control methods.
Innovation Solution
An OLED display device with an image data converter that analyzes image data to prevent overcurrent generation by modulating image data and grayscale voltage levels, using luminance correction gain values to ensure current remains within predetermined limits, thereby simplifying circuit configurations and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate memory is used to store frame data for overcurrent prevention, then overcurrent can be controlled, but circuit complexity increases and production costs increase
Solution Approach 1:
The patent merges the frame data storage function into the existing memory structure used for displaying previous frame images. Instead of adding a separate memory dedicated to overcurrent prevention, the system utilizes the existing memory resources to store both display data and overcurrent monitoring data, thereby eliminating the need for additional memory components and simplifying the overall circuit configuration.
Solution Approach 2:
The existing memory in the OLED display device is made multi-functional by using it for both displaying previous frame images and storing frame data for overcurrent prevention. This universal usage of the memory component allows the system to perform multiple functions with a single component, reducing device complexity and production costs while maintaining reliable overcurrent prevention.
2Reliability
If frame data is stored in separate memory for overcurrent control, then overcurrent can be prevented, but production costs increase
Solution Approach 1:
The patent combines the overcurrent prevention data storage function with the existing display memory, eliminating the need for separate memory components. This merging reduces the bill of materials and assembly complexity, directly lowering production costs while maintaining the reliability of overcurrent prevention through effective frame data storage and analysis.
3Reliability
If frame current amount is controlled by storing image data, then overcurrent can be prevented, but the time to modulate image data increases
Solution Approach 1:
The patent performs preliminary analysis of frame data to predict potential overcurrent conditions before the actual display refresh occurs. By预先 analyzing the stored frame data and identifying images that may cause overcurrent, the system can proactively adjust brightness levels or skip problematic frames, preventing overcurrent issues before they occur and avoiding time-consuming real-time modulation during the display refresh cycle.
Solution Approach 2:
The system implements a feedback mechanism where the analyzed frame data from stored memory informs real-time display control decisions. By continuously monitoring stored frame data and comparing it against overcurrent thresholds, the system provides feedback that enables dynamic adjustment of display parameters, preventing overcurrent conditions while maintaining efficient image data modulation without excessive processing time.
Data Source
AI summary
Disclosed are an organic light emitting diode (OLED) display device and a method for driving the same, which are capable of simplifying the configuration of an overcurrent prevention circuit while preventing overcurrent generation at an image display panel, and achieving a reduction in production costs. The OLED display device includes an image data converter for analyzing input image data, to reduce the possibility of overcurrent generation and to prevent overcurrent generation, modulating image data and a grayscale voltage level (or a gamma voltage level) of a next frame when overcurrent is generated, and outputting the modulated image data and the modulated grayscale voltage (or the modulated gamma voltage), and a timing controller for arranging the image data from the image data converter to match a size of an image display panel, supplying the arranged image data to a data driver, and generating a data control signal to control the data driver.