Display Source Driver Signal Holding and Multiplexing
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Solution Overview
Problem
Conventional display driving devices require increased area and data transmission time due to separate conversion and transmission processes, necessitating memory circuits for storing digital data and resulting in inefficient operation.
Innovation Solution
The display driving device incorporates multiple source drivers with sensing circuits to sample and hold input signals, multiplexers to transmit signals, analog-to-digital converters to convert signals, and transmission circuits to send data to a timing controller, allowing for simultaneous conversion and transmission while other source drivers hold input signals, thereby reducing the need for memory circuits and shortening data transmission time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory circuits are used to store digital data for multi-channel transmission, then data can be stored and transmitted in time-division manner, but chip area is increased
Solution Approach 1:
The patent merges the sensing circuit's signal holding function with the data transmission function. The sensing circuit holds input signals during the transmission time of other source drivers, eliminating the need for separate memory circuits. This combining of functions reduces chip area while maintaining data storage capability.
Solution Approach 2:
The sensing circuit is given a dual function: it not only samples and converts analog signals to digital data but also holds input signals during transmission periods. This multi-functionality eliminates the need for dedicated memory circuits, thereby reducing chip area.
2Reliability
If conversion and transmission are operated separately with memory storage, then data can be properly managed, but total transmission time is increased
Solution Approach 1:
The sensing circuit performs preliminary action by holding input signals during the transmission time of other source drivers. This preliminary holding of signals enables the ADC to convert and transmit data without waiting for memory readout, thereby reducing total transmission time while maintaining proper data management.
Solution Approach 2:
The patent enables continuous useful action by having the sensing circuit continuously hold input signals ready for conversion and transmission. This eliminates idle time between conversion and transmission operations, reducing total transmission time while ensuring proper data management through continuous signal availability.
3Adaptability or versatility
If multiple source drivers use separate memory circuits for digital data storage, then each driver can operate independently, but device complexity and area are increased
Solution Approach 1:
The patent merges the memory storage function into the sensing circuit's signal holding capability. This eliminates separate memory circuits for each source driver, reducing device complexity while maintaining independent operation capability through the shared bus lane transmission mechanism.
Solution Approach 2:
The sensing circuit is designed with universal functionality to serve multiple purposes: signal sampling, signal holding during other drivers' transmission, and data conversion. This multi-functionality reduces overall device complexity while preserving independent operation capability.
Data Source
AI summary
The present disclosure discloses a display driving device capable of reducing a chip area and a data transmission time and a display device including the same. The display driving device includes a first source driver and a second source driver. Each of the first source driver and the second source driver may include a sensing circuit configured to sample and hold input signals of a multi-channel, a multiplexer configured to transmit the input signals held by the sensing circuit, an analog-to-digital converter configured to convert, into digital data, the input signals received from the multiplexer, and a transmission circuit configured to transmit the digital data to a timing controller through a bus lane. The sensing circuit of the second source driver may hold the input signals while the first source driver transmits the digital data.