Pixel Transistor Layout for Leakage-Stable Display Voltage
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Solution Overview
Problem
Existing display devices experience leakage current through transistors connected in series, which destabilizes the voltage within the pixel, affecting the display performance.
Innovation Solution
The display device is designed with specific transistor configurations, including third-first and third-second transistors with asymmetrical semiconductor and gate electrode widths, and additional capacitors to minimize leakage current and stabilize pixel voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors are connected in series to control pixel voltage, then voltage control capability is improved, but leakage current increases
Solution Approach 1:
The patent applies asymmetry by configuring the third-first transistor and third-second transistor with different channel widths. Specifically, the third-first transistor has a first channel width while the third-second transistor has a second channel width that is smaller than the first channel width. This asymmetric design allows the series-connected transistor pair to maintain effective voltage control capability while reducing the overall leakage current through the pixel circuit.
2Power
If transistor channel width is increased to reduce resistance, then current flow capability is improved, but leakage current increases
Solution Approach 1:
The patent applies local quality by assigning different channel widths to different transistors based on their specific functional requirements. The third-first transistor has a larger channel width to facilitate current flow during active periods, while the third-second transistor has a smaller channel width to minimize leakage current. This localized optimization of channel width in different parts of the circuit resolves the contradiction between current flow capability and leakage reduction.
Data Source
AI summary
A display device includes a light-emitting element disposed on a substrate, a first transistor configured to control a driving current flowing in the light-emitting element, a second transistor configured to apply a data voltage to a source electrode of the first transistor, a third-first transistor connected to a gate electrode of the first transistor, and a third-second transistor connected between a source electrode of the third-first transistor and a drain electrode of the first transistor. One side of a semiconductor region of the third-second transistor adjacent to a source electrode of the third-second transistor has a first width, and another side of the semiconductor region of the third-second transistor adjacent to a drain electrode of the third-second transistor has a second width smaller than the first width.