TFT Conditioning Circuit for Display EMI Suppression
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Solution Overview
Problem
As display devices require higher resolution and increased data transmission rates, they experience more severe electromagnetic interference (EMI), posing a challenge for meeting anti-EMI standards and potentially affecting device functionality and user health.
Innovation Solution
A display device and driving circuit that incorporates a TFT conditioning circuit with thin-film transistors to attenuate the amplitude of the serial data clock, providing a conditioned clock to the display driver, effectively reducing EMI by utilizing a predetermined gate bias to control the attenuation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmission rate of the display driver is increased to meet higher resolution requirements, then the data transmission capability is improved, but the electromagnetic interference becomes more serious
Solution Approach 1:
The patent introduces a serial data clock attenuation circuit as an intermediary component between the display driver and the serial data clock signal source. This circuit mediates the relationship between high-speed data transmission and EMI reduction by conditionally attenuating the SDCLK signal based on transmission rate thresholds, allowing high productivity while suppressing electromagnetic interference through the intermediary attenuation mechanism.
2Object-generated harmful factors
If the amplitude of the serial data clock is attenuated to reduce EMI, then the electromagnetic interference is suppressed, but the signal strength may be reduced
Solution Approach 1:
The patent implements dynamic attenuation of the SDCLK signal by using a serial data clock attenuation circuit that adjusts the attenuation level based on the current transmission rate. When the transmission rate exceeds a predetermined threshold, the circuit dynamically attenuates the signal amplitude to reduce EMI; when the transmission rate is below the threshold, the circuit maintains the original signal strength. This dynamic adjustment ensures signal integrity is preserved while suppressing electromagnetic interference only when necessary.
3Manufacturing precision
If the transmission rate is increased to meet resolution requirements, then the display quality is improved, but the power consumption increases
Solution Approach 1:
The patent changes the parameter of SDCLK signal amplitude dynamically based on the transmission rate. By using an attenuation circuit that adjusts the signal strength parameter, the system can operate at high transmission rates for high resolution displays while reducing power consumption through controlled signal attenuation. The parameter change in signal amplitude directly affects power consumption, allowing the system to optimize between display quality and energy usage.
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
The solution effectively suppresses EMI in display devices, enabling them to pass EMI tests without redesigning the circuit board, while also reducing power consumption and maintaining signal integrity.
Implementation Method 1
The TFT conditioning circuit includes one or multiple thin-film transistors, and attenuates an amplitude of a serial data clock in response to a predetermined gate bias to provide the conditioned serial data clock to the display driver
Data Source
AI summary
A display device and a display driving circuit with electromagnetic interference suppression capability are provided. The display device includes a substrate, an active matrix, a display driver and a thin-film transistor (TFT) conditioning circuit. The active matrix disposed on the substrate includes multiple data lines, multiple gate lines and multiple pixels. The data lines intersect with the gate lines. The pixels are coupled to intersections of the data lines and the gate lines. The display driver disposed on the substrate generates signals for driving the data lines and/or the gate lines in response to a conditioned serial data clock. The TFT conditioning circuit disposed on the substrate is coupled to the display driver. The TFT conditioning circuit includes one or more TFTs, and attenuates an amplitude of a serial data clock in response to a predetermined gate bias to provide the conditioned serial data clock to the display driver.