An intra-panel interface for the Chip-On-Glass (COG) application is developed using a Clock-embedded Voltage Differential Signaling (CVDS). The proposed interface adopts an embedded clock scheme to eliminate the skew between data and clock signals. The transmitter and receiver for the proposed interface are equipped with the transition compensator and equalizer to overcome the frequency limitation caused by highly resistive Line-On-Glass (LOG) of the COG application. The maximum data rate per pair is measured as high as 780Mbps at the prototype with the refresh rate up to 105Hz. The proposed interface achieves low electromagnetic interference (EMI) and low power consumption. The power consumption of the proposed interface is reduced by 50% compared to the conventional interfaces for the COG application.
An improved signaling scheme for the intra-panel interface for the chip-on-glass (COG) application is proposed. The proposed signaling scheme adopts a transmitter with the current-mode driver with shunt termination for an impedance matching on the transmitter and a receiver without termination to eliminate the multiple reflections on the transmitter. It obtains good signal quality on the receiver without additional current consumption. The transmitter for the proposed signaling scheme adopts the current-mode driver with shunt termination instead of the voltagemode driver with series termination resistor for minimizing the effect caused by the process dependency of the circuitry in the transmitter. The receiver for the proposed signaling scheme is equipped with the loss compensator to equalize the channel loss caused by the highly resistive signal line-on-glass (LOG) and low channel bandwidth due to open termination on the receiver. The proposed signaling scheme is verified with 9.7-inch XGA (1024RGB768) resolution TFT-LCD module for tablet computer. The proposed signaling scheme achieves the low electromagnetic near-field radiation from the signal lines by acquiring the good signal integrity on the transmission channel.
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