Gate Drive Circuit M-Phase Segmentation for Display Switching
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Solution Overview
Problem
Existing display technologies face challenges in promptly transitioning gate lines between selected and unselected states, leading to delays that can result in decreased display quality due to signal overlap and inefficiencies in transistor degradation.
Innovation Solution
A display device with a drive unit comprising multiple drive circuits that utilize M-phase drive signals with different phases, where the electric potential of internal wiring changes based on these signals to switch gate lines between states, incorporating output switching elements with a gate electrode connected to different drive circuits, a drain electrode supplied with drive signals, and a source electrode connected to the gate line, ensuring a sufficient potential difference for rapid state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two transistors are used to switch the gate line to unselected state, then reliability is improved by compensating for transistor degradation, but transition speed to unselected state becomes slower
Solution Approach 1:
The patent divides the gate line switching function into two separate circuits: a first circuit (T6) connected to internal node Vc1(n+2) and a second circuit (T7) connected to internal node Vc2(n). This segmentation allows each circuit to operate independently, with the first circuit providing rapid switching response while the second circuit ensures reliability during transistor degradation, thus resolving the contradiction between speed and reliability.
2Productivity
If prompt transition to unselected state is achieved, then display quality is improved by preventing data signal overlap, but transistor degradation occurs faster
Solution Approach 1:
The patent applies different functional characteristics to different parts of the switching system. The first switching circuit (T6) is optimized for rapid response with connection to Vc1(n+2), while the second switching circuit (T7) is optimized for reliability with connection to Vc2(n). This local differentiation allows the system to achieve prompt transitions without causing excessive degradation in a single transistor, as the workload and stress are distributed across two circuits with different characteristics.
Data Source
AI summary
A display device includes a display panel, and drive circuits sequentially scanning gate lines and supplied with any of M-phase (M: three or greater) drive signals having different phases and a first potential or a second potential (lower) at predetermined cycles. The drive circuit includes netA(n) whose potential changes by drive signal with the first/second potential as reference, and an output circuit switching a corresponding gate line to a selected/unselected state and including first output switch including a gate connected to netA(n+1) of a first drive circuit different from the drive circuit, a drain supplied with the drive signal, and a source connected to the gate line. Difference between the potential of netA(n+1) in case of switching the gate line to the unselected/selected state and the reference potential in netA(n+1) is equal to difference between the first and second potentials or greater.