Gate Driver Odd-Even Pixel Driving Without Demultiplexer Dead Space
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Solution Overview
Problem
Display devices face issues with large dead spaces due to the use of demultiplexers in data drivers, which reduce the number of output channels but create unnecessary space at the top or bottom of the display.
Innovation Solution
A gate driver design that omits the demultiplexer by using a control circuit to control voltages of control and inversion control nodes, with odd and even gate output circuits to apply signals to adjacent pixels sharing a data line, thereby performing a demultiplexing function without physical demultiplexers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a demultiplexer is used in the data driver to reduce the number of output channels, then the number of output channels is reduced, but a large dead space is created at the top or bottom of the display device
Solution Approach 1:
The invention extracts the demultiplexer function from the data driver and relocates it to the gate driver. By removing the demultiplexer from its original position in the data driver, the harmful dead space is eliminated while the channel reduction benefit is preserved through the gate driver's odd/even gate signal output circuits
Solution Approach 2:
The gate driver acts as an intermediary that performs the demultiplexer function. The control circuit generates control signals that selectively activate odd or even gate output circuits, effectively demultiplexing the gate signals without requiring a physical demultiplexer component in the data driver path
2Device complexity
If a demultiplexer is used to reduce output channels, then device complexity is reduced in terms of channel count, but the layout efficiency deteriorates due to dead space
Solution Approach 1:
The invention merges the demultiplexer function with the gate driver circuitry. The odd gate output circuit and even gate output circuit are integrated into the gate driver, combining multiple functions (gate signal generation and demultiplexing) into a single device, thereby eliminating dead space while maintaining channel reduction
Data Source
AI summary
A gate driver includes a plurality of stages. Each of the stages includes a control circuit configured to control a voltage of at least one control node and a voltage of at least one inversion control node, an odd gate output circuit configured to output an odd gate signal in response to the voltage of the at least one control node and the voltage of the at least one inversion control node, and an even gate output circuit configured to output an even gate signal in response to the voltage of the at least one control node and the voltage of the at least one inversion control node. The odd gate signal is applied to an odd pixel, the even gate signal is applied to an even pixel, the odd pixel and the even pixel are included in a same pixel row, and the odd pixel and the even pixel share one data line.