FPD33684

FPD33684 NSC | Alldatasheet

Document overview

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Technical content

Features

n RSDS™ (Reduced Swing Differential Signaling) data bus for low power, reduced EMI and small PCB foot print n Up to 85MHz clock n Supports both XGA and SXGA timing n Supports notebook and monitor applications n Smart Charge Conservation for low power consumption n 64 Gray levels per color (18-bit color) n Supports both Dot and N-Line inversion n Externally programmable gamma characteristic n Very low offsets for artifact-free images n High voltage outputs for high contrast in a large range of display panel applications n Optional, high current, repair line buffers n Available in 2 common gamma reference curves

Ordering Information

Part Number Gamma Curve Custom TCP # Package Suffix FPD33684 A or B XX(Note 1) CT Note 1: Custom TCP # is assigned by National Semiconductor for each custom TCP design System Diagram DS200113-1 May 2002 FPD33684 Low Power, Low EMI, TFT-LCD Column Driver with RSDS Inputs, 64 Grayshades, and

384 Outputs for XGA/SXGA Applications

© 2002 National Semiconductor Corporation DS200113 www.national.com

VGMA1 (= 8.0V) and V GMA10 (= 0.5V) with a line time = 22 µs. level low value (VLxx). This parameter applies to every output on the die. The typical value represents one standard deviation from ideal based on fina l test data. Note 10: Vparterr is meant to guarantee the part to part output variation. The average of all outputs at gray level 32 is compared to a nominal gray level 32 value. Note 11: Current into device pins is defined as positive. Current out of device pins is defined as negative. |V OUT −V IN| > 500mV. FIGURE 1. RSDS™ Signal Definition

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Timing Diagrams(Continued) DS200113-4 DS200113-5 FPD33684 www.national.com 6

The FPD33684 is a low power, low EMI, 384 output column driver with 64 gray level capability (6-bit). It provides direct drive for TFT-LCD displays, eliminating the need for V com modulation. Direct drive significantly reduces system power consumption and also reduces component count while pro- viding superior image quality and cross-talk margin. The FPD33684 utilizes National’sCharge Conservation Technol- ogy that recovers energy stored in the capacitance of the column lines to reduce power consumption further. The FPD33684 is designed for use in systems using dot inversion as the method of polarity inversion. Column inver- sion and N-line inversion are also supported. Other modes of polarity inversion including line inversion and frame inversion are not supported. Digital video data inputs to the FPD33684 are received via a low power, low EMI Reduced Swing Differential Signaling (RSDS ™ ) bus. The RSDS ™ digital video commands one of 64 gray level voltages on each output. Output voltages are driven with individual high drive, low offset operational am- plifiers. Data loading and line buffering is accomplished by means of an internal, bi-directional shift register. GAMMA CORRECTION The FPD33684 is designed to offer compatibility with a wide range of panel gamma characteristics. The output voltage is controlled by the digital data on the RSDS ™ bus. Two iden- tical R-DACs are used to program the output voltages. One R-DAC provides the high-polarity output voltages (voltages higher than V com) and the other provides the low-polarity output voltages (voltages lower than V com). The FPD33684 is available with two R-DAC resistance curve options, both of which have been carefully designed to ac- curately match the natural, inverse gamma of a twisted nematic (TN) display with a 2.2 gamma transfer character- istic. A typical TN display, when operated with the FPD33684 drivers will produce a luminance with grayscale characteris- tics typical of CRT monitors. The R-DAC resistance values for the FPD33684A are shown in Figure 3and Figure 4. The DS200113-6 FPD33684 www.national.com7

technology significantly reduces power consumption. polarity changes do not occur at every line transition. rise and fall times than drivers with convential amplifiers. the maximum output current of conventional drivers. require an additional output from the timing controller. Figure 7. Optional pins do not need to be carried off a to a neighboring pad on the die by a tie on the tape. the shift register into a second latch for conversion to analog.

Functional Description(Continued) When POL = L, odd numbered outputs (1, 3, 5, ...383) are controlled by VGMA6 through VGMA10 and even numbered outputs are controlled by VGMA1 through VGMA5. When POL = H, odd numbered outputs are controlled by VGMA1 through VGMA5 and even numbered outputs are controlled by VGMA6 through VGMA10. RPI1/ RPI2— REPAIR INPUT 1 AND 2 (INPUT) The input signal for the repair line buffers. These buffers are optional and when not used, the input should be tied to ground. The pin can be tied to ground through a local pin on the TCP, eliminating the need to bring the repair amp inputs or outputs off the TCP. RPO1/ RPO2— REPAIR OUTPUT 1 AND 2 (OUTPUT) The output of the repair line buffers. These outputs are current buffered copies of their respective inputs. UP — DATA SHIFT DIRECTION — UP OR DOWN (INPUT) The UP pin controls the data shift direction. If UP is high then data is shifted “up” from output 1 to output 384, ENIO1 is configured as an input, and ENIO2 is an output. If UP is low then data is shifted “down” from output 384 to output 1, ENIO2 is an input, and ENIO1 is an output. The UP pin can be tied either high or low through connection to a neighbor- ing pin, eliminating the need to bring the pin off the package. CSTIME — CHARGE SHARE TIME The CSTIME pin allows the user to set the duration of charge-sharing mode based on the panel capacitance and resistance. V DD1 — DIGITAL VOLTAGE SUPPLY Positive supply voltage for the digital logic functions of the driver. VDD2 — ANALOG VOLTAGE SUPPLY Positive supply voltage for the analog functions of the driver. V GMA1–VGMA10 — RDAC REFERENCES (INPUTS) The reference voltages to the upper and lower RDACs used to control the inverse gamma transfer function of the driver. Option - Any or all of the inputs V GMA2 through VGMA4 and VGMA7 through VGMA9 can be left undriven (floating). VHBIAS — HIGH BIAS CURRENT VOLTAGE SUPPLY Optional positive supply voltage that provides a constant bias current to the output amplifiers to extend dynamic range. When separately provided, V HBIAS must be 1.5V greater than V GMA1. When not separately provided, V HBIAS must be tied to V DD2. In this configuration, V GMA1 must be held at or below V DD2 −1.5V. VSS1 — DIGITAL GROUND Digital ground reference voltage. V SS2 — ANALOG GROUND Analog ground reference voltage. FPD33684 www.national.com9

FIGURE 3. FPD33684A R-DAC Transfer Characteristic (continued in next figure)

FIGURE 4. FPD33684A R-DAC Transfer Characteristic (continued from prior figure)

FIGURE 5. FPD33684B R-DAC Transfer Characteristic (matches Samsung S6C0666) (continued in next figure)

FIGURE 6. FPD33684B R-DAC Transfer Characteristic (matches Samsung S6C0666) (conitnued from previous figure)

The FPD33684 is available in TCP or as singulated die. Note: This figure represents a FPD33684 die oriented pad side up. FIGURE 7. FPD33684 I/O Configuration

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com FPD33684 Low Power, Low EMI, TFT-LCD Column Driver with RSDS Inputs, 64 Grayshades, and National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the righ t at any time without notice to change said circuitry and specifications.