AMOLED Gate Driver Multiplexing for Channel Reduction
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Solution Overview
Problem
Conventional AMOLED displays require a large number of gate drivers and output channels, increasing production costs due to the need for multiple gate drivers as resolution increases, which complicates the conversion of voltage signals to current signals for pixel driving circuits.
Innovation Solution
The implementation of a gate driver connected to a display panel with multiplexers that selectively output scan signals or constant low voltages to sub-pixel driving circuits, reducing the number of output channels needed by using multiplexing control signals to manage the output ends during different phases of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the AMOLED display is increased, then the display definition is improved, but the number of output channels of the gate driver increases significantly, resulting in increased product costs
Solution Approach 1:
The patent merges the functions of two gate drivers into one by using a single gate driver to control both the first and second scan lines through multiplexers. The gate driver outputs scan signals that are routed to different scan lines based on the state of the multiplexing control signal, thereby reducing the number of gate drivers and output channels while maintaining the ability to drive high-resolution displays
Solution Approach 2:
The gate driver is designed to perform multiple functions by controlling multiple scan lines through the multiplexers. A single gate driver can sequentially or simultaneously drive different rows of pixel circuits by switching the multiplexers, making the gate driver universal and reducing the overall number of gate drivers needed in the system
2Reliability
If the number of gate drivers is increased to maintain display performance, then the display performance is maintained, but the production cost increases
Solution Approach 1:
The patent combines multiple gate driver functions into a single gate driver unit. By using multiplexers to route scan signals from one gate driver to multiple scan lines, the system reduces the number of gate drivers needed, thereby lowering production costs while maintaining the ability to drive all pixel circuits properly
Solution Approach 2:
The multiplexer acts as an intermediary between the gate driver and the scan lines. It receives scan signals from the gate driver and selectively routes them to different scan lines based on the multiplexing control signal, enabling one gate driver to control multiple scan lines without directly connecting to each one, thus reducing the number of gate drivers required
Data Source
AI summary
The invention provides an AMOLED display and driving method thereof, wherein a display panel is provided with a plurality of multiplexers, with each multiplexer having a multiplexer control end receiving a multiplexing control signal, a first input end connected to gate driver and a second input end to a constant low voltage. The first and second output ends are respectively connected to the first and second control ends of corresponding rows of sub-pixel driving circuits. When driving AMOLED display, the multiplexer receives scan signal from gate driver, and under control of multiplex control signal, the first and second output ends selectively output scan signal or the constant low voltage, respectively to generate two different control signals respectively outputted to the first and second control ends of corresponding row of sub-pixel driving circuits. The invention can reduce the number of the output channels of gate drivers to reduce production cost.