LCD flat panel display with bezel off and illuminated by RGB laser backlight
Quality Image means range of available colors, their depth and saturation, how bright they appear and how clearly they are defined. Adaptation of lasers as a light source provides all of these attributes, since the lasers generate the widest color gamut and the most saturated colors nature can provide. Furthermore, image quality must be perfect and flawless including elimination of "speckle" at the laser level, which is a negative image artifact associated with the monochromatic nature of laser light.
Total Cost to deliver a quality experience includes everything from power consumption, lifetime & reliability and cost to manufacture and assemble the display hardware as well as environmental friendliness. To satisfy these requirements the laser light source must be power efficient, compact, reliable & carefree, and cost effective & easily integrated into industry standard design and assembly process, which are very high threshold for traditional lasers to overcome.
Semiconductor RGB laser module
The solution to providing the highest quality images with low cost and high reliability is to adopt multiple semiconductor lasers as the light source of choice. Semiconductor red and blue lasers have been commercially available for years, and both are extensively used in consumer electronics products such as CD players (red laser) and Blu-rayTM
HD·DVD player / recorders. There are no commercially available semiconductor green lasers yet, however, currently three companies in the world have produced GaN based functional prototypes of semiconductor green lasers, some of which can produce >50mW of green power. Based on the history of these products, both semiconductor lasers have demonstrated:
- Mass Production Capable Design -> Low Cost @ High Volume
- Proven Reliability -> Long Lifetime
- High Optical Efficiency -> Lower Power Consumption
- Small & Compact package -> Industry Standard Design
- 100% Green Design -> No Hg (Mercury vapor)
Furthermore, taking fundamental spectrum profiles of semiconductor lasers into consideration, slightly different center wavelength and associated bandwidths of multiple semiconductor laser emitters help reduce or eliminate speckle at the laser level. COLOR owns US and international patents to protect this speckle reduction method and use of semiconductor lasers in broad display applications.
Simulated image of 3D TV
Making use of ranges and profiles of spectrum available from semiconductor lasers, COLOR’s semiconductor laser light source technology can offer a unique 3D display approach which does not require active LCD shutter glasses. Instead, COLOR´s proprietary 3D display approach enables viewers to enjoy true 3D experience with inexpensive (maybe disposable), passive eyewear that results in:
- Brighter image, because this passive eyewear uses much clearer glasses (the current active shutter glasses look like tinted sunglasses).
- Much less cross-talk between left and right eye images compared to the current active shutter glasses
- 100% passive and light weight design; no power cord, battery or connections required
- Totally insensitive to all the different frame sequential methods adopted by all the LCD flat panel TV set manufacturers
- Even though it uses a passive eyewear, COLOR´s 3D approach is NOT based on state of polarization to differentiate left and right images like the current 3D digital cinemas, therefore, this approach can be used for LCD flat panel TV / monitor sets.
This 3D approach developed by COLOR can be incorporated into various glass-free auto-stereoscopic display methods in which left and right images are focused sequentially into viewer´s eyes by using 2nd
LCD panel to distribute each image or directional backlight technology. COLOR has already filed patent applications for this unique 3D display technology.
The left picture is RGB Laser Backlight illuminated image using patented speckle reduction approach with bandwidth enhancement. The saturated and expanded color gamut is clearly and visibly demonstrated.
In recent years COLOR has been focusing its resources to develop RGB laser backlight unit (laser BLU) for the LCD flat panel displays. For many display markets, consumer or professional, the LCD flat panels are turning out to be the most dominant display hardware of choice and as a result the world wide backlight unit (BLU) market has been growing with a double digit growth rate in recent years.
Currently, the most widely used light source for the LCD backlight unit is a cold cathode fluorescent lamp (CCFL), however, LEDs (white LED as well as RGB·LED) have been replacing CCFLs as the backlight in LCD panels at ever increasing pace and expected to surpass CCFLs within the next 2+ years. This is because, as a solid state light source, LEDs are brighter, smaller / thinner and more reliable than CCFLs and do not contain mercury (i.e. 100% Green). They also consume less power, last longer, and some like RGB·LEDs provide wider color gamut.
These deficiencies of CCFL open the door for LEDs and similar shortcomings associated with LEDs will open the door for next generation backlight technology for the LCD panels, which will be COLOR’s RGB laser backlight. COLOR’s RGB laser backlight technology will enable LCD panel manufactures to effectively compete with emergence of organic LED flat panels (OLEDs) with widest color gamut, best color saturation, highest image contrast and less manufacturing cost. To further protect and secure the broad use of semiconductor lasers in various backlight configurations, COLOR has filed multiple patent applications for laser illuminated backlight designs for LCD displays. This is why one of the leading LCD panel manufacturers in the world has entered into a Joint Development Agreement with COLOR to develop an LCD flat panel monitor with RGB laser backlight unit.
To compliment this Joint Development activity, COLOR has been collaborating with one of the top semiconductor laser manufacturers in the world to develop semiconductor green light source / laser to be used for the RGB laser backlight application.
In addition to these engineering collaboration efforts with two leading companies in the electronics industry, COLOR’s extensive patent portfolio of 12 US and international patents and 4 pending applications forms the core of its strength to fulfill its vision of making RGB laser backlight as the next generation illumination unit for LCD flat panel displays.