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LC151X01 Datasheet(PDF) 7 Page - NXP Semiconductors |
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LC151X01 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 27 page Product Specification 7 / 27 LC151X01 Liquid Crystal Display Ver. 0.2 Mar.06. 2002 5. The output of the inverter must have symmetrical(negative and positive) voltage waveform and symmetrical current waveform.(Unsymmetrical ratio is less than 10%) Please do not use the inverter which has unsymmetrical voltage and unsymmetrical current and spike wave. Lamp frequency may produce interface with horizontal synchronous frequency and as a result this may cause beat on the display. Therefore lamp frequency shall be as away possible from the horizontal synchronous frequency and from its harmonics in order to prevent interference. 6. Let s define the brightness of the lamp after being lighted for 5 minutes as 100%. T S is the time required for the brightness of the center of the lamp to be not less than 95%. 7. The lamp power consumption shown above does not include loss of external inverter. The used lamp current is the lamp typical current. 8. The life is determined as the time at which brightness of the lamp is 50% compared to that of initial value at the typical lamp current on condition of continuous operating at 25 ± 2 C. 9. Requirements for a system inverter design, which is intended to have a better display performance, a better power efficiency and a more reliable lamp, are following. It shall help increase the lamp lifetime and reduce leakage current. a. The asymmetry rate of the inverter waveform should be less than 10%. b. The distortion rate of the waveform should be within •2 ±10%. * Inverter output waveform had better be more similar to ideal sine wave. Do not attach a conducting tape to lamp connecting wire. If the lamp wire attach to a conducting tape, TFT-LCD Module has a low luminance and the inverter has abnormal action. Because leakage current is occurred between lamp wire and conducting tape. I p I -p * Asymmetry rate: | I p – I –p | / Irms * 100% * Distortion rate I p (or I –p) / Irms |
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