DIGITAL LIGHT PROCESSING (DLP) REVOLUTION IN VISION

POINTS TO DISCUSS:- INTRODUCTION. DIGITAL MICROMIRROR DEVICE (DMD). ORIGIN OF DLP. WORKING OF DLP. DLP FEATURES. ONE OR THREE CHIP PROJECTOR. ADVANTAGES OF DLP. DISAVANTAGES OF DLP. APPLICATION OF DLP. FUTURE OF DLP. CONCLUSION.

INTRODUCTION:- Up until recently, big screen projection sets are come in two types:- CRT based projector and the other is LCD based projector.

CATHODE RAY TUBE:- Cathode Ray Tube is basically a “hot-cathode device”. Cathode Ray Tube (CRT) is known to be a beam of electron emitted from a heated cathode inside a vacuum tube and accelerated by a potential difference between the cathode and anode. An image is produced by modulating the intensity of the electron beam received by the video signal.

Cathode ray tube:- CRT is still finding a useful device in computer gaming due to the high refresh factor and higher resolution per initial cost. The flicker in the monitor or screen causes headaches. Due to high voltage recruitment it consumes more power and difficult to maintain.

LIQUID CRYSTAL DISPLAY:- A Liquid Crystal Display (LCD) is a thin, flat display device made up of many no of colour or monochrome pixels arrayed in front of a light source or reflector. It uses very small amount of electric power then other system,so can be used in any powered electronics devices.

Liquid crystal display:- Drawbacks of LCD:- 1) Low contrast ratio. 2) Longer responses time then plasma and CRT. 3) In capable of viewing very low resolution images. Applications:- Television screen, LCD projector, monitors

PLASMA TECHNOLOGY:- Plasma technology is different from all other technology, here in each pixels a source is of light is produced. The main attraction of plasma screen is the fact they are flat enough to be wall mounted, thus eliminating the need for that box or separate projector.

Plasma technology:- Advantages of Plasma:- 1) Flat enough to be well mounted and eliminating box or separate projector. 2) It provides a viewing image which can view from any angle with in 160 degree. 3) No magnetic disturbances. 4) Multimedia flexibility. Disadvantages:- More expansive then CRT & LCD.

DIGITAL MICROMIRROR DEVICE(DMD) A Digital Micromirror Device (DMD) is simply a semiconductor switch. A DMD chip has on its surface several thousand of microscopic mirrors arranged in a rectangular array which correspond to the pixels in the image to be displayed. The mirror is made up of aluminum and around 16 micrometer across.

Digital Micromirror Device:- Each one is mounted on a yoke which in turn is connected to two support posts by compliant torsion hinges. The hinges can’t be damaged by normal shock or vibration, since it is absorbed by DMD super structure. The advantages of this are more accurate timing and more filmic moving image.

Digital Micromirror Device:- The advantages of this are more accurate timing and more filmic moving image. Applications:- Television and HDTVs Holographic versatile discs. Head mounted displays.

ORIGIN OF DLP:- First DMD (Digital Micromirror Device) was invented by Larry Hornbeck in In year 1994 Texas Instruments demonstrated the DLP (Digital Light Processing) projector.

DIGITAL LIGHT PROCESSING(DLP) Digital light processing (DLP) is a technology used in projector as well as in video projectors. It was invented in Texas instruments in 1987 by Dr. Larry Hornbeck, which creates the final link to display digital visual information.

WORKING OF DLP:- DMD (Digital Micromirror Device) is the cornerstone of DLP (digital light processing) as CPU is the heart of computers. It includes:-1. A light system 2. A color filter system 3. A cooling system. 4. A projection optics.

Working of DLP:- Depending upon the application a DLP will accept either digital or analog signal. When it receives an analog signal it converts the analog signal into digital form in DLP’s front end processor.

Working of DLP:- The signal received goes through DLP video processor and becomes progressive red, green and blue (RGB) data. Then like other digital devices the progressive colors are formatted into entire binary bit planes of Data.

DLP PROJECTOR

DLP CHIP

DLP LIGHT PROJECTION:-

DLP FEATURES:- Clarity (by minimizing the gaps between pixels in projector image,DLP projector system creates a seamless digital picture that’s sharp at any size). Brightness (Due to the mirror system, they use light more efficiently). Color (eight time greater then analogue projection system.)

DLP FEATURES:- Reliability (DLP is totally digital and it’s not susceptible to heat, humidity, vibration and any other environmental factors). Minimum maintenance. Life span (the DMD is very reliable, no maintain or alignment is required. DLP lamp can work for 8000Hr.costs around $250 to replace).

ONE OR THREE CHIP PROJECTOR:- One-chip DLP systems use a projection lamp to pass white light through a color wheel that sends red-green-blue colors to the DMD chip in a sequential order to create an image on-screen. Only one DMD chip is used to process the primary RGB colors.

THREE CHIP PROJECTOR:- Three-chip DLP systems use a projection lamp to send white light through a prism, which creates separate red, green, and blue light beams. Each beam is sent to their respective red, green, and blue DMD chip to process the image for display on- screen.

ONE CHIP PROJECTION:-

THREE CHIP PROJECTION:-

CINEMA IN DLP:- The DLP projector has the refresh rate double as the analog system. Films are recorded at 24Hz, which is sufficient to achieve the effect of motion but it has flickers. To avoid this DLP projector has 48Hz refresh rate, hence greatly mitigates flickers. DLP cinema projection technology allows us to display images at any frame rate. This is done using the control versatility of DMD, which allows independent control of every bit. Thus human eye can’t judge the flickers.

ADVANTAGES OF DLP:- High speed image creation then other projectors. Noise free. High perceived resolution (consistent picture quality). Brighter. Sharper (Exact mirror image of an incoming video or graphic signal resulting in projection that’s seamless at any resolution).

ADVANTAGES OF DLP:- VVersatile. MMore reliable (display system using DLP technology are able to recreate their incoming source material with each projection, ensuring a full-impact projection experience that will not fade over time). CConsistent picture quality.

DISADVANTAGES OF DLP:- Rainbow effect a major problem.

DISADVANTAGES OF DLP:- Due to the rapid change in color causes eye strain and headaches, which may hamper the viewer. In single chip projector system at any instant the on screen image is not total. So picture quality is not as the original image.

APPLICATION OF DLP:- This projector can be used as home theatre, television and film projection. Other application includes its high- definition image creation are photo finishing, three dimensional visual display, microscope, spectroscope and medical imaging.

DLP VS LCD DDLP has much higher pixels then LCD called “fill factor”. Due to this fill factor the DLP gives a much good image as original image and it gives a good resolution to the image. DDLP produces much smoother image as compared to the LCD system. DDLP has high contrast ratio and efficient use of light. LLight efficiency of DLP is more then LCD.

DLP VS LCD:-

CONCLUSION:- Understand it. Plan it. Implement it. Use it. Refine it and Support it.

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