OLED Display Bridge Unit for Luminance Uniformity
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Solution Overview
Problem
Organic light-emitting diode (OLED) displays face luminance non-uniformity due to differences in driving currents across pixels, which existing compensation techniques fail to fully address, leading to issues like the Mura effect and stains.
Innovation Solution
A method and structure that includes a bridge unit in the OLED display to detect and control driving current sharing between adjacent pixels by connecting or disconnecting the anodes of OLEDs based on a data comparison signal, ensuring that pixels receiving the same data signal share currents, thereby maintaining uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If existing compensation techniques are used to address luminance non-uniformity, then some luminance issues are partially mitigated, but luminance non-uniformity such as Mura effect and stains still occur
Solution Approach 1:
The patent merges adjacent pixels with the same data signal into pixel groups and connects their anodes together to share driving currents. This combining approach ensures uniform luminance across pixels that should display the same brightness, effectively preventing Mura effect and stains while maintaining display quality.
2Illumination intensity
If driving currents are shared between adjacent pixels, then luminance uniformity is improved, but device complexity increases due to bridge unit and switching mechanisms
Solution Approach 1:
The patent employs dynamic switching mechanisms where the bridge unit connects or disconnects anodes of adjacent pixels based on whether they have the same data signal. This dynamic approach allows the system to adaptively share currents only when needed, improving luminance uniformity while managing device complexity through conditional operation.
Solution Approach 2:
The bridge unit acts as an intermediary component that mediates between the data driver and pixel circuits. It intelligently determines which pixels should share currents and facilitates this sharing through controlled connections, thereby improving luminance uniformity without requiring fundamental redesign of the entire display structure.
3Device complexity
If pixels with different data signals are forced to share currents, then device complexity is reduced, but luminance non-uniformity worsens due to incorrect current distribution
Solution Approach 1:
The patent implements a feedback mechanism where the bridge unit continuously monitors data signals applied to adjacent pixels and adjusts current sharing accordingly. By comparing data signals and selectively connecting anodes only for pixels with identical signals, the system ensures correct current distribution while maintaining relatively simple device architecture.
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 effectively prevents luminance non-uniformity by ensuring that pixels with the same data signal share driving currents, improving luminance uniformity and reducing the Mura effect and other defects.
Implementation Method 1
organic light-emitting diode (OLED) displays use OLEDs that generate light
Data Source
AI summary
An organic light-emitting diode (OLED) display and a method of driving the same are disclosed. In one aspect, the OLED display includes a display panel including a plurality of pixels each including an OLED through which driving current is configured to flow and a scan driver configured to apply a scan signal to the display panel. The display also includes a data driver configured to apply a data signal and a data comparison signal to the display panel, wherein the data comparison signal indicates whether the same data signal is applied to adjacent pixels among the pixels, and a timing controller configured to control the scan driver and the data driver. The display further includes a bridge unit configured to control the OLEDs of the adjacent pixels to share the same driving current with each other based at least in part on the scan signal and the data comparison signal.