Display Driver Circuit Reduces Area and Interference
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Solution Overview
Problem
Existing drivers for display devices using AMOLED panels face challenges in reducing the number of parts and area required for sampling and holding sensing signals, as well as interference from unsensed channels affecting adjacent channels during sensing operations.
Innovation Solution
A driver configuration that includes a multiplexer with two input stages, switches, and a switching circuit to alternately select and connect sensing signals to either input stage, reducing interference by applying a constant voltage to unselected channels through a common power line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver samples and holds sensing signals for all 2N channels, then complete pixel sensing is achieved, but the number of parts and area required increases
Solution Approach 1:
The patent divides the 2N channels into two groups: odd channels and even channels. The multiplexer alternately selects and processes signals from these two groups in separate time periods, allowing complete sensing coverage while using fewer simultaneous sampling resources, thereby reducing the driver area.
Solution Approach 2:
The patent implements periodic alternation between sensing odd channels and even channels. During a first time period, odd channels are sensed; during a second time period, even channels are sensed. This periodic time-division multiplexing allows complete sensing coverage while reducing the number of parts and area required at any given moment.
2Loss of information
If the driver alternately senses odd and even channels to reduce data transmission, then data amount is reduced, but unsensed channels cause interference to adjacent channels
Solution Approach 1:
The patent applies preliminary anti-action by connecting unselected channels (even channels when odd are selected, and vice versa) to a common power line before sensing operations begin. This pre-connection ensures that unselected channels are held at a stable voltage potential, preventing them from floating and causing interference to adjacent selected channels through coupling or noise.
Solution Approach 2:
The common power line serves as an intermediary element that connects unselected channels to a stable voltage reference. This intermediary connection isolates the unselected channels from floating states and prevents them from acting as sources of interference, while still allowing the multiplexer to alternately select between odd and even channels for sensing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the number of parts and area needed for sampling and holding sensing signals, minimizes interference between selected and unselected channels, and simplifies the sample & hold circuit, ensuring stable sensing operations.
Implementation Method 1
a switching circuit configured to switch the connection of a common power line to the first input stage or the second input stage
Data Source
AI summary
Disclosed is a driver for a display device, which is improved to stably sense pixels. The driver includes a multiplexer configured to output the sensing signal of a first input stage or second input stage, a first switch configured to switch a connection between an odd channel and the first input stage, a second switch configured to switch a connection between an even channel and the second input stage, and a switching circuit configured to switch a connection between a common power line and the first input stage or the second input stage.