About two years ago, a major breakthrough brought us the LCD projector. It usually comes in a small carrying case. While projectors initially cost more than Rs 4 lakhs, current prices for the low-end models have dropped. We don't expect the average individual to go for an LCD projector for home use. That's for really BIG audiences.
Many companies make LCD projectors.
Two other companies are Proxima and Sharp. In teaching, this is often true. Depending on the equipment you're using, you may only be getting a dozen words from your picture. With a little attention to the right software and hardware, your picture might be worth ten thousand words. Remember, image is everything.