Chapter 9

Simple circuitry for cellular telephone/camera flash illumination

A practical guide for successfully implementing flashlamps

Jim Williams and Albert Wu

Introduction

Next generation cellular telephones will include high quality photographic capability. Improved image sensors and optics are readily utilized, but high quality “Flash” illumination requires special attention. Flash lighting is crucial for obtaining good photographic performance and must be quite carefully considered.

Flash illumination alternatives

Two practical choices exist for flash illumination—LEDs (Light Emitting Diode) and flashlamps. Figure 9.1 compares various performance categories for LED and flashlamp approaches. LEDs feature continuous operating capability and low ...

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