Display Device SPI Switching Unit Stub Line Elimination
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Solution Overview
Problem
In display devices, the presence of stub lines during read or write operations between the timing controller, flash memory, and external devices leads to clock signal attenuation and distortion, affecting the accuracy of unevenness correction and overall display quality.
Innovation Solution
A system and method that utilize a switching unit and data register to manage connection settings via a write enable line, eliminating stub lines by selectively connecting the timing controller and flash memory or external device through a serial peripheral interface (SPI), using an inter-integrated circuit (I2C) interface to generate connection setting data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stub lines are present in the connection section during read or write operations, then the connection between timing controller, flash memory, and external device is established, but clock signal attenuation and distortion occur
Solution Approach 1:
The patent extracts and removes the stub line from the connection path by implementing a switching unit that can disconnect the external device connection during read/write operations. The switching unit selectively connects or disconnects the external device from the SPI interface, eliminating the capacitive effect of the stub line that causes clock signal attenuation and distortion.
Solution Approach 2:
The patent implements a dynamic connection structure using switching units that can change the connection state between timing controller, flash memory, and external device based on operation mode. The switching unit dynamically connects the external device during data input and disconnects during read/write operations, adapting the connection topology to the current operational requirements.
2Reliability
If the switching unit selectively connects timing controller and flash memory or external device, then clock signal distortion is prevented, but the device complexity increases
Solution Approach 1:
The switching unit is designed with multi-functionality to perform multiple roles: it acts as a connection switch for external device access, a stub line remover during read/write operations, and a signal path selector. By consolidating these functions into a single switching unit with control logic, the patent reduces the need for separate components while maintaining the required functionality.
3Adaptability or versatility
If the external device is connected through SPI interface, then data input capability is improved, but stub line capacitance causes signal reflection and distortion
Solution Approach 1:
The patent implements dynamic connection control where the switching unit changes the SPI interface topology based on operational mode. During external device data input, the switching unit connects the external device to the SPI interface for versatile data access. During read/write operations to flash memory, the switching unit disconnects the external device to eliminate stub line effects, maintaining signal integrity.
Data Source
AI summary
There is provided a display device including an input unit configured to connect an external device to a serial peripheral interface (SPI) through a plurality of connection lines, a switching unit configured to connect the input unit and a flash memory of a driving board to the SPI, a data register configured to output connection setting data for determining a connection state of the switching unit, and a timing controller configured to output a control signal for determining the connection setting data according to an input of a write enable line among the plurality of connection lines.