Display Driving IC Source Driver Merging for Sensing Amplification
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Solution Overview
Problem
Existing display driving integrated circuits for OLED display panels require separate low-noise amplifiers for sensing pixel information, which increases the size and cost of the circuit due to the additional components needed for amplification.
Innovation Solution
The integration of source drivers within the display driving integrated circuit to perform both display and sensing operations, where the source drivers are configured to act as low-noise amplifiers by connecting in parallel, eliminating the need for a separate amplifier for sensing pixel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate low-noise amplifiers are added to sensing circuits for pixel information, then sensing precision is improved, but device complexity and area increase
Solution Approach 1:
The patent merges the source driver and sensing amplifier into a single integrated circuit block. The source driver that normally drives pixel data is configured to also function as the sensing amplifier when sensing operations are performed, eliminating the need for separate amplifier circuits while maintaining sensing precision
Solution Approach 2:
The source driver is designed with multi-functionality, serving dual purposes: driving pixel data during display operations and amplifying sensing signals during sensing operations. This universal design allows the same circuit hardware to perform multiple functions, reducing overall device complexity
2Measurement precision
If separate low-noise amplifiers are added to sensing circuits, then signal amplification capability is improved, but manufacturing cost increases
Solution Approach 1:
By combining the source driver and sensing amplifier functions into one integrated circuit, the patent reduces the total component count and simplifies manufacturing processes. This merger lowers manufacturing costs while preserving the necessary signal amplification capability through the integrated amplifier function
3Measurement precision
If separate amplifiers are included in the display driving integrated circuit, then pixel information sensing capability is improved, but the area of the integrated circuit increases
Solution Approach 1:
The patent integrates the sensing amplifier function within the existing source driver circuit area, eliminating the need for separate amplifier circuits. This merging approach maintains pixel information sensing capability while minimizing the increase in integrated circuit area by reusing existing circuit real estate
Solution Approach 2:
The source driver is designed to perform both driving and sensing amplifier functions, allowing the same physical circuit area to serve multiple purposes. This multi-functionality reduces the total area required compared to having separate dedicated circuits for each function
Data Source
AI summary
A display driving integrated circuit includes a timing controller, a first source driver including a first inverting input, a first non-inverting input, and a first output, a second source driver including a second inverting input, a second non-inverting input, and a second output, and a switching circuit connected with the display panel through a first and second pads. Under control of the timing controller, the switching circuit performs one of a first switching operation of connecting the first inverting input and the first output with the first pad, connecting the second inverting input and the second output with the second pad, and applying first and second decoding voltages to the non-inverting inputs, respectively; and a second switching operation of applying a sensing reference voltage to the non-inverting inputs, and connecting the output terminals with an output node, and connecting the inverting inputs with one pad.