Display Device Short Circuit Detection and Power Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting diodes in display devices suffer from efficiency degradation and power consumption issues due to accumulated driving time, prompting the need for improved power management and detection of short circuits in ultra-small light emitting elements.
Innovation Solution
A display device and driving method that include a subpixel with a light emitting unit, a detector, and a blocking controller to detect short circuits and block driving current based on voltage comparisons, utilizing inorganic light emitting diodes of nano-scale or micro-scale size, and a blocking controller to manage power consumption by determining reference voltages and generating cutoff signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic light emitting diodes are used in display devices, then light emission is achieved, but power consumption increases and efficiency degrades over time due to accumulated driving time
Solution Approach 1:
The detector performs preliminary detection of short circuits in light emitting elements before they cause complete failure. By detecting voltage differences between series-connected light emitting elements, the system identifies defective elements early and blocks current flow through them, preventing further power consumption and potential damage to other elements.
Solution Approach 2:
The system implements a feedback mechanism where the detector continuously monitors the voltage across light emitting elements, and the blocking controller adjusts current flow based on this feedback. When a short circuit is detected (voltage difference exceeds threshold), the system feeds back a blocking signal to stop current flow, thereby optimizing power consumption and protecting the display device.
2Measurement precision
If ultra-small light emitting elements of nano-scale or micro-scale size are used, then display resolution is improved, but detection of short circuits becomes more difficult
Solution Approach 1:
The detector acts as an intermediary that simplifies the detection of short circuits in ultra-small light emitting elements. Instead of directly measuring minute physical defects in nano-scale elements, the detector measures voltage differences across series-connected elements, which are macroscopic electrical parameters easier to detect. This intermediary measurement approach enables reliable detection despite the small scale of individual elements.
Solution Approach 2:
The patent replaces direct physical inspection or mechanical detection methods with electrical measurement. By substituting voltage measurement for direct observation or physical testing of ultra-small elements, the system achieves reliable short circuit detection without being constrained by the limitations of detecting nano-scale or micro-scale physical defects.
3Illumination intensity
If continuous current flow is maintained in light emitting elements, then light emission is sustained, but unnecessary power consumption occurs when short circuits are present
Solution Approach 1:
The blocking controller extracts or removes the harmful current flow through short-circuited light emitting elements while maintaining current flow through healthy elements. By selectively blocking current only where needed (through defective elements) while preserving it elsewhere, the system eliminates unnecessary power consumption without compromising overall light emission from functional elements.
Data Source
AI summary
A display device and a driving method thereof are disclosed. The display device includes a subpixel including a light emitting unit including a first electrode, a second electrode, and a plurality of light emitting elements connected between the first electrode and the second electrode, and a driving transistor configured to supply a driving current to the light emitting unit; a detector electrically connected to the light emitting unit to detect a short circuit in the plurality of light emitting elements; and a blocking controller configured to control blocking of the driving current based on an output of the detector. Accordingly, power consumption of the display device may be improved.