User manual PLANAR LC640.480.33-AC Operations Manual

[. . . ] Operations Manual LC640. 480. 33-AC HIGH BRIGHTNESS 10. 4" COLOR TFT AMLCD ® The Definition of Quality Copyright © 1999 by Planar Systems, Inc. Planar and The Definition of Quality are registered trademarks. ColorBrite is a trademark of Planar Systems, Inc. This document is subject to change without notice. [. . . ] Backlight Life. Usage Backlight life (typical to 50% of initial luminance) Continuous at full luminance Continuous at half luminance Typical use using ABC* * Automatic brightness control 20K hours 100K hours 35K hours LC640. 480. 33-AC Operations Manual (OM600-01) 7 Interfacing and Operation Control Basics Power Requirements The LC640. 480. 33-AC display requires two power supplies: +5 Vdc for the LCD logic and +12 Vdc for the backlight. In Table 6 below, the backlight current and power are referenced to maximum luminance, 25 °C ambient temperature. Table 6. Input Power Symbol Backlight Min Typ Max Units Backlight voltage Absolute max. voltage Steady state current (VH = +12 Vdc) Peak start-up current (VH = +12 Vdc) Power (VH = +12V) LCD VH VHMAX IH IHSU PH VL VLMAX VL IL PL +10. 8 0 ­ ­ ­ 4. 5 0 ­ ­ ­ +12. 0 ­ 1. 9 ­ 23 +5. 0 ­ ­ 280 1. 4 +13. 2 +16 2. 5 3. 5 30 +5. 5 6. 0 100 450 2. 3 Vdc Vdc Adc Adc W Vdc Vdc mVpp mAdc W LCD voltage Absolute max. voltage VL permissible ripple (VL = +5V) Current (VL = +5V) Power (VL = +5V) CAUTION: Absolute maximum ratings are those values beyond which damage to the device may occur. Undervoltage Lockout (Backlight only) An undervoltage lockout (UVLO) function is included which disables the backlight under excessively low VH conditions. The UVLO circuit will disable the backlight at approximately +8. 5 Vdc as VH falls and will enable the backlight at approximately +9. 5 Vdc as VH rises. Power Sequencing (LCD only) Certain restrictions on the behavior of the VL (+5 Vdc) source and in the application of the VL source relative to the application or removal of the video signals must be observed. These restrictions are shown in Figure 2, where "Vcc"= VL and "data" = video signals. 8 LC640. 480. 33-AC Operations Manual (OM600-01) Figure 2. Power Sequencing. 4. 5V 2. 7V Vcc 4. 5V data where: t1 10ms 0< t2 10ms 0< t3 1s t1 t2 t3 Applying video signals before VL is applied may cause a latchup condition. Allowing VL to remain "on" for a long period of time after video signals are removed--which stops the cell scanning--may produce a latent image. In addition, there is a restriction regarding dropouts on the VL supply as illustrated in Figure 3 ("Vcc"= VL). This is related to the reset circuit for the LCD's internal logic. If a dip in VL exceeds 10 ms in duration or VL falls below 2. 7 Vdc then the power sequencing procedure should be followed. Figure 3. VL Supply Dropouts. Vcc where: 4. 5V 2. 7V td td 10ms Backlight Signals The dimming control and /DISABL inputs are analog, though the latter is intended to be driven from either an open collector device or CMOS logic. The /ABCOFF input is a CMOS-compatible digital input. Table 7. Backlight Signal DC Characteristics. Description Min Max Units Symbol Absolute max. input voltage Dimming input voltage range Recommended pot. value RLUM HI source current /ABCOFF input /DISABL input -0. 3 0 10 ­ +3. 6 0 ­ +4. 5 0 ­ +5. 3 +5. 0 100 600 +5. 0 +1. 4 0. 5 +5. 0 +1. 0 1. 3 Vdc Vdc K ohm µA Vdc Vdc mA Vdc Vdc mA VIMAX VRLUM RLUM IRLUM VIHA VILA IILA VIHD VILD IILD Note: Incorrect operation of the undervoltage lockout (UVLO) circuit may occur if the /DISABL input is allowed to operate between VILD and VIHD. LC640. 480. 33-AC Operations Manual (OM600-01) 9 Video Signals Video Signal Characteristics Video signal inputs on J3 are digital inputs and are compatible with CMOS logic. Table 8. Video Signal DC Characteristics. Description Symbol Minimum Maximum Units Absolute Maximum Input Voltage Low-level Input Voltage High-level Input Voltage Low-level Input Current1 High-level Input Current2 VImax VIL VIH IIL1 IIL2 IIH1 IIH2 -0. 3 0 0. 7VL ­ ­ ­ ­ VL + 0. 3 0. 3VL VL 1 60 1 60 Vdc Vdc Vdc µA µA µA µA 1. I IL1 applies to all signals except R/L and U/D. IIH1 applies to all signals except ENAB, U/D, and R/L. IIH2 applies to signals ENAB, U/D, and R/L. Video Modes The video interface automatically recognizes 480-, 400-, and 350-line formats. Mode recognition depends on the polarity of the sync signals as shown in Table 9. Table 9. [. . . ] As can be seen, luminance is at nearly 95% of the final value after five minutes of operation, and 99% of the final value at 10 minutes after startup. Figure 14. Warmup Curve. Warmup Curve 100 80 60 21. 5 23. 0 22. 5 22. 0 Center Luminance, % 40 21. 0 20 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 20. 5 20. 0 Time, minutes Lum, % PH Display Dimensions The recommended clearance shown in Figure 15 illustrates the distance behind the display ECA which should be left for free low of air for the purposes of convection cooling. In Figure 15, dimensions are in millimeters. Tolerances unless specified are as follows: . x ±0. 50 . xx ±0. 25 Note: The dimensions in this drawing are approximate. [. . . ]