Subpixel Driver Bridge Electrode for Lower Current-Path Resistance
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Solution Overview
Problem
Existing display devices face challenges in reducing the resistance of lines through which driving currents flow, which affects the efficiency and performance of subpixels in display devices.
Innovation Solution
The display device incorporates a bridge electrode that connects the electrodes of transistors involved in generating and controlling driving currents, minimizing the resistance of the lines through which these currents flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transistor connections are used without bridge electrodes, then the device complexity is reduced, but the resistance of lines through which driving currents flow increases
Solution Approach 1:
A bridge electrode is introduced as an intermediary component to connect the drain electrode of the eighth transistor and the source electrode of the fifteenth transistor. This bridge electrode serves as a mediator that reduces the resistance of the line through which the driving current flows, while allowing the transistors to remain spaced apart from each other.
Solution Approach 2:
The bridge electrode extends in a second direction (vertical direction) to connect electrodes that are spaced apart in the first direction (horizontal direction). By utilizing the vertical dimension, the patent reduces the resistance of the current path without increasing the horizontal footprint or complicating the planar layout of the transistors.
2Reliability
If transistors are spaced apart to reduce resistance, then the line resistance decreases, but the area occupied by the subpixel increases
Solution Approach 1:
The bridge electrode utilizes the vertical dimension (second direction) to connect spaced-apart electrodes, allowing the transistors to be positioned further apart in the horizontal direction without increasing the overall subpixel area. The vertical extension of the bridge electrode provides a low-resistance path without consuming additional horizontal space.
Solution Approach 2:
The bridge electrode is strategically positioned only where needed - connecting the drain of the eighth transistor to the source of the fifteenth transistor. This localized connection reduces resistance only in the critical current path without requiring additional space throughout the entire subpixel structure.
3Reliability
If bridge electrode is added to connect spaced electrodes, then the line resistance is reduced, but the device complexity increases
Solution Approach 1:
The bridge electrode serves multiple functions simultaneously: it acts as a connection electrode between the eighth and fifteenth transistors, serves as a ground electrode for the ninth transistor, and provides a low-resistance path for the driving current. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity.
Solution Approach 2:
The bridge electrode merges the functions of a connection electrode and a ground electrode into a single structural element. By combining these functions, the patent reduces the number of separate components needed, thereby reducing the increase in device complexity that would otherwise result from adding the bridge electrode.
Data Source
AI summary
A display device includes a scan write line configured to receive a scan write signal, a scan initialization line configured to receive a scan initialization signal, a sweep signal line configured to receive a sweep signal, a first data line configured to receive a first data voltage, a second data line configured to receive a second data voltage, and a subpixel connected to the scan write line, the scan initialization line, the sweep signal line, the first data line, and the second data line. The subpixel includes a light-emitting element, a first pixel driver including a first transistor configured to generate a control current according to the first data voltage of the first data line, and a second pixel driver including an eighth transistor configured to generate a driving current applied to the light-emitting element according to the second data voltage.