Cross-talk Preventing Circuit for Light Emitting Devices
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Solution Overview
Problem
Organic electroluminescent devices and other light emitting devices suffer from cross-talk phenomenon, where varying line resistances cause different voltages to be applied to pixels, resulting in inconsistent luminance across the display, contrary to the intended uniformity.
Innovation Solution
A light emitting device with a cross-talk preventing circuit that provides compensating currents to the scan lines based on display data, ensuring equal total current values across all scan lines, thereby maintaining consistent voltage and luminance across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scan lines are provided with scan signals of the same voltage in sequence, then the device structure is simple and easy to manufacture, but different voltages are applied to pixels due to line resistance, causing cross-talk and luminance variation
Solution Approach 1:
The patent changes the voltage parameter of scan signals dynamically based on detected current values. The controller adjusts scan signal voltages to compensate for line resistance effects, ensuring uniform luminance across pixels while maintaining the simple sequential scanning structure. This resolves the contradiction by modifying electrical parameters rather than physical structure.
Solution Approach 2:
The patent implements a feedback mechanism where the controller detects current values flowing through each scan line and uses this information to adjust subsequent scan signal voltages. This closed-loop control compensates for line resistance variations, eliminating cross-talk while preserving the simple manufacturing approach.
2Manufacturing precision
If compensating currents are provided to scan lines to prevent cross-talk, then luminance uniformity is improved, but the device complexity increases due to additional circuit components
Solution Approach 1:
The controller performs multiple functions: it generates scan signals, detects current values, calculates compensating voltages, and outputs adjusted scan signals. By making the controller multi-functional, the patent avoids adding separate dedicated compensation circuits, thus improving luminance uniformity without significantly increasing device complexity.
Solution Approach 2:
The patent merges the scan signal generation and compensation functions into a single integrated process within the controller. The current detection, calculation, and voltage adjustment are combined in one control unit, eliminating the need for separate compensation circuitry and minimizing additional complexity.
Data Source
AI summary
A light emitting device and a method of driving the same are provided where a cross-talk problem can be overcome. The light emitting device includes a display panel including a plurality of scan lines disposed in a first direction, a plurality of data lines disposed in a second direction, wherein the second direction is different from the first direction, and a plurality of pixels that are defined as overlying areas of the plurality of scan lines and the plurality of data lines, and a cross-talk preventing circuit configured to provide the plurality of scan lines with compensating currents according to display data provided by an outside device.