LITEMAX LF1203 Ultra brightness 12.1" LCD Display Rev: Date: 0.1 July 4, 2001 LITEMAX Electronics Inc. No.8, Lane 89, Sec. 3, Chung-yang Rd., Tucheng City, Taipei County, Taiwan R.O.C. Tel : 886-2-2267-6766 Fax: 886-2-2267-6779 Homepage: http://www.litemax.com.tw General Introduction The LITEMAX model LF1203 is a 12.1" color TFT-LCD product. Its brightness is up to 800 cd/m. The LF1203 consists of TFT LCD panel module (SP1203), LCD controller board and backlight inverter (LI2002). By applying the LITEMAX backlight technical to the LF1203, the display quality can be improved. LCD Panel Module (SP1203) 1. Introduction SP1203 is a 12.1", ultra brightness LCD panel module. This module consists of Sharp LQ121S1DG11 TFT color LCD and a LITEMAX Ultra Brightness (UB) backlight mounted onto the back of the LCD. The entire is about 24.5 mm thick and has the same footprint as the original Sharp LQ121S1DG11 LCD. The SP1203 panel module has a higher contrast, wide view-angle LCD and a wider operating temperature range. In the normal mode operation, the SP1203 module delivers 800 Cd/m (nits) LCD screen brightness at a backlight power of 27.5 Watts. With a dimming inverter, the module can be operated in a reduced brightness mode with lower power consumption and longer lamp life. With a wide dimming range of LITEMAX inverter, the SP1203 LCD panel module presents a super color image over ambient illumination levels from full bright sunshine to total darkness, making it highly suitable for various outdoor applications. LITEMAX Confidential 2 2. Optical Performance The typical SP1203 LCD panel module screen luminance and contrast ratio are shown in the figures below: SP1203 Optical Performance Brightness 900 800 700 Horizontal 600 500 400 Vertical 300 200 100 0 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Viewing Angle The LCD screen luminance is measured with the LCD in the 'Off' state (i.e. the pixels are not energized). This is the 'White' state with maximum luminance. Quite often, this 'Off' state is brighter than the 'White' displayed on the screen after the LCD is turned on. The difference maybe caused by the graphics card and/or on the LCD controller card driving this display. When the LCD is driven properly, the luminance difference between the 'Off' state and the 'White' color should be less than 10 %. LITEMAX Confidential 3 SP1203 Optical Performance Contrast Ratio 160 140 120 Horizontal View 100 80 Vertical View 60 40 20 0 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Viewing Angle The inherent contrast ratio (CR) of the LCD is the luminance ratio between the 'White' and the 'Black' states measured in a dark room. In outdoor environments, the contrast ratio of the display drops significantly due to the surface reflections and glare caused by the ambient illumination at the front surface of the LCD and other surfaces such as touch screen or the protective window. LITEMAX Confidential 4 3. Characteristics Luminance Uniformity LCD Contrast Ratio Screen Dimming Ratio 20% or better 300 Note 2 White vs Black 100:1 With LI2002 inverter LCD Screen Chromaticity White ( LCD in off state ) x=0.3300, y=0.3518 Measured at normal direction Red x=0.5938, y=0.3375 Measured at normal direction Green x=0.3119, y=0.5860 Measured at normal direction Blue x=0.1547, y=0.1386 Measured at normal direction Viewing Angle 3:00 to 9:00 direction -55 ~ 55 degrees Contrast Ratio >=10 6:00 to 12:00 direction -45 ~ 45 degrees Contrast Ratio >=10 3:00 to 9:00 direction -65 ~ 65 degrees Screen luminance >= 100 nits 6:00 to 12:00 direction -55 ~ 55 degrees Screen luminance >= 100 nits Backlight Power Consumption 27.5 Watts Excluding inverter losses LCD Module Weight 3090 Grams with Encasing Note 1: All data are measured at 25- C 2 C ambient temperature. Note 2: Uniformity = (Lmax/Lmin-1)*100%. Lmax (Lmin) is the maximum (minimum) luminance measured with a 10 mm diameter meter aperture over the LCD active area except the last 10 mm area from the edge. 4. Optical specification, Signal Timing Specification and Signal Timing Wave Form In addition to the data described on characteristic, please refer to SHARP LQ121S1DG11 for other information. LITEMAX Confidential 5 4. Interface connection 4.1 Electrical Interface Connection Please refer to SHARP LQ121S1DG11. 5. Backlight Lamp Driving Specification It is recommended to use an inverter with a 1300 Vrms starting voltage to run the VHB backlight in the SP1203 LCD panel module. At the maximum LCD screen luminance, the lamp voltage and current are listed below: Operating Voltage 470 Lamp Current xx Vrms mArms At this driving condition, the backlight delivers the specified maximum LCD screen brightness with power consumption about 27.5 Watts. Since most inverters used to driver CCFLs have efficiency between 75 % - 80 %, the total DC power input to the inverter is about 35 Watts. When the backlight is dimmed down, the power consumption decreases. LITEMAX Confidential 6 6. Mechanical Characteristics LITEMAX Confidential 7 B. LITEMAX LI2002 inverter 1. Introduction LI2002 is a CCFL inverter to operate LITEMAX ultra brightness (UB) backlights. The inverter has an on-board pulse width modulation (PWM) dimming circuit for extremely wide range luminance adjustment. Over the entire dimming range, there is no noticeable lamp flickering and the uniformity of the backlight is well maintained. When using LI2002 with LITEMAX LCD modules, it is not necessary to synchronize the PWM circuit to vertical sync signal of the LCD. 2. Dimming Control The LI2002 accepts a 0-5V analog voltage for dimming control. It has a pulse width modulation (PWM) dimming circuit for luminance adjustment. As the dimming voltage Vd decreases from +5V, the lamp current waveform is pulse width modulated at a repetition rate high enough to prevent LCD flicker. Within each PWM cycle, the lamps in the backlight are turned fully 'ON' for a fraction of the cycle time. The human eyes, being very slow with respect to the PWM rate, respond to the average light produced over the PWM cycle. As a result, the luminance of the backlight and/or the LCD screen is approximately to the duty cycle of the PWM waveform. The lamp current waveform with the PWM circuit Set at less than 100% LITEMAX Confidential 8 In general, inverters with PWM dimming have a very wide luminance adjustment range. For most practical cases, the LI2002 inverter can achieve a dimming ratio up to 200:1. Hence, the luminance of the backlight or LCD screen can be adjusted from 100% to 0.5%. The 0- 5V dimming voltage can be generated simply by a potentiometer, by a digitally controlled UP/DOWN counter or a digital potentiometer. The inverter provides a regulated +5V supply to power the dimming circuit. However, the maximum current drain from this source should be kept less than 5 mA. At a Vd input about 0.34V and less, the duty cycle of the PWM waveform is 0% and thus, the lamps are 'OFF'. In order to fully utilize the available dimming voltage, Vd should be biased to about 0.34V and then ramping up to 5.0V. 3. Electrical Characteristics The LI2002 inverter operates at 12V DC input and can drive up to 8 lamps for a maximum output power about 24.5 Watts. In addition, the inverter has a regulated +5V output serving as a voltage source for the dimming control circuit. Electrical Characteristics Param eters M in Typ M ax Input Voltage (Vin) 11.5 12 12.5 Input current (I) 2.04 Lam p Starting Voltage (Vst) 1300 Frequency (f) 55 O N/O FF Control -O FF -O N Units Conditions Vin=12, Vd=5 V Vrm s 53 58 0 0.2 Vin=12, Vd=5 V Khz Floating Dim m ing Voltage(Vd) @ 100% Duty Cycle @ 0% Duty Cycle 5V O utput (+5VO UT) 4.9 0.3 0.34 4.85 5 5V O utput Source Current LITEMAX Confidential 5 5.3 5 9 Vdc M ax brightness Vdc Zero brightness Vdc 11.5<Vin<12.5V Absolute M aximum Rating Parameters Inverter Input Voltage (Vin) Operating Temperature Range Storage Temperature Range Min Max Units 11 13 Vdc 0 50 C -20 80 C 4. Interface Connector Input Connector (CN1) Pin# 1 2 3 4 5 6 7 Function 5V Output 12V Input 12V Input Dimming Control Ground Ground ON/OFF Control 5. Mechanical Characteristics LITEMAX Electronics Inc. reserves the right to make changes to this document and the product, which it describes without notice. LITEMAX Electronics Inc. also shall not be liable for technical or editorial errors or omissions made herein; nor for incidental or consequential damages resulting from the furnishing, performance, or use of this product. In addition, LITEMAX Electronics Inc. takes no responsibility for damage caused by improper use of this product, which does not meet the conditions for use specified in this specification sheet. LITEMAX Confidential 10