A point-to-point intra-panel interface for data and clock of TFT-LCD in 0.18um works at 2Gbps, with the 10~20dB EMI enhancement over the clock embedding scheme. The sub-pixel clock is cascaded with the transition time maximized for low EMI.

A 2-Gb/s point-to-point intrapanel interface for thinfilm-transistor liquid crystal display (TFT-LCD) is proposed by using only clock and data lines. Extra control lines are eliminated by sending the VSYNC code through the clock line at the start of the VBLANK time period and by sending the control commands through the data line at the end of the VBLANK time period. To reduce electromagnetic interference, the slew rate of the clock driver is reduced, and the frequency of clock signals is set to the subpixel (R/G/B) frequency (1/10 of the data rate). The clock line is cascaded between two adjacent receiver (RX) chips for a point-to-point interface. To generate an internal clock synchronized (deskewed) to the subpixel (R/G/B) boundary of incoming data at each RX, a single all-digital delay-locked loop (DLL) circuit is proposed to perform the combined operation of a DLL and a phase interpolator. This deskew operation is performed during the VBLANK period with periodic preamble data input ('1111100000'). At the RX, a multiphase DLL follows the deskewDLL to generate 20-phase clocks for data sampling. 2-Gb/s data are transmitted through a series connection of a 100-cm-long flat flexible cable and a 50-cm-long FR4 microstrip line with a bit error rate less than 1e-12. The image test was successfully performed with a 42-in full-high definition 120-Hz LCD panel at 1.5 Gbps. The area and power consumption of RX chip is 0.35 mm 2 and 52.4 mW at 2 Gbps with a 0.18-µm complementary metal-oxidesemiconductor process and a 1.8-V supply. Index Terms-Clock-Aligned-to-Data Intrapanel (CADI), deskew, DLL, intrapanel interface, point-to-point, thin-filmtransistor LCD, VSYNC.

A 2×2 module prototype is developed with four 15‐inch RGBW LCDs. Transmittance of LCD is increased with the low resolution, that is, qXGA(512×RG×384×BW). Using a new RGBW conversion algorithm, white and R/G/B luminance are increased 270% and 130% respectively in comparison with the 15‐inch conventional RGB LCD. An electronics system is implemented and a GUI is developed to support the hardware image control for tiled display.

Abstract