Archive for September, 2008
Samsung vs Sony Tv Lcd
LED vs. OLED
Here is a quick rundown for people that feel a bit lost. Answer is: NO!, OLED and LED, are not the same thing! Simply claimed, LED screens are the link between current LCD and the OLED, expected to come out in a few years. Common to all 3 though: images are shown on a slab made of points, juxtaposed sub-pixels actually, red, green and blue.
The Plain Vanilla LCD
Light is emitted by a tube as wide as the display is. There are usually four tubes, either parallel or placed on the sides.
The tube emits light behind the color cells. One can guess from this intentionally simplified illustration, the issue this could produce: the closer more cells are to the tube, the brighter. On this drawing, the top line will be more clear than the bottom one.
This basically raises concerns of color consistency on the screen where variations of 30 pc in light power are commonly found between two points intended to show the same color!
This is not a dead-end. Makers of top-end displays are now more conscientious to light distribution. In some monitors, rare and very pricey, variation did reach 15% between a clear point and another darker one.
The latter thus has a tendency to a dark gray to a particularly told gray for bad screens, instead of precise black.
It is just “magnifique”. The consistency is perfect (when the screen is adequatelyly setup), and to obtain an absolute black on a sub-pixel, just switch it off. This let’s you play much more finely with colors, at the sub-pixel level , whereas with a tube a whole quarter of the slab is influenced at a time, or five hundred thousand sub-pixels at once (on a Full HD panel) when power is varied.
These are only prototypes and final products are not prepared just yet for the high price . How much would the same 32-inch TV launch at? Beyond any reasonable affordability most likely.
So if OLED is not ready just yet, what’s the alternative for now.
LED Screens
Now tubes are removed from LCD screens and replaced by white LEDs spread out behind the LCD slab. Making a technology where only the LCD back-lighting has been modified.
But the diagram does show the principal constraints of the backlit LED. The more diodes, the better homogeneity will be. Nonetheless, homogeneity concerns remain.
As with LCD tubes, light leakage thru the black dots of the image persists. It can get better when the monitor notes that the image displayed is dark. It then decreases the brightness of the LEDs that illuminate the dark area. This results in conspicuous changes in lighting from one image to another.
A Light Source For Each Point: The Key To Quality
Assuming assume a total of two hundred diodes providing backlighting to a Full HD panel measuring 1920 x 1080 pixels. We would then have 1920 x 1080 = 1778 Mega pixels, or 5.33 million sub-pixels. Each diode would thus funnel light to 5.33 million / 200 = 26,667 sub-pixels per diode. Summarizing:
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- LED screens, are only equipped with forty-eight LEDs, not 200! Interest is so much less.
- In LED screens, many have diodes not matrixed behind the cells, but on the sides! The advantage here becomes then pretty much exclusively for selling purposes.
- Eventually, the dynamic contrasts of LED screens are still unsatisfactory and produce unbalanced pictures, with moving areas of gray like clouds in motion.
A logical progress could then be anticipated. Alas, it is not that simple…
So theoretically, yes, it’s better, as long as enough diodes are packed in – and they’re regularly lacking – and enhance the dynamic contrasts to make use of the flexibility introduced by LEDs vs. tubes. For now, cutting the dynamic contrast is always recommended on all models of TVs and monitors!
To go further and read some reviews, some users report their opinion of LED monitors and TVs:
About the Author
Reviews and revels all things new and shiny. Check out this OLED beauty: Sony XEL-1 11-Inch OLED Digital TV
Samsung 22″ LE22S86BDX HD LCD TV REVIEW
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VIZIO VA220E 22-Inch ECO 720p LCD HDTV $289.99 This 22″ ECO HD TV is energy efficient exceeding the current Energy Star guidelines by at least 15%, saving you money on your utility bills. The high definition resolution and elegant design make it the perfect HDTV for small spaces…. |
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VIZIO SV421XVT 42-Inch XVT-Series 240 Hz SPS LCD HDTV $807.00 Breaking the mold of traditional HDTVs, the VIZIO XVT series brings you the latest, cutting edge HDTV technologies. From 1080p full high definition resolution, to 240Hz SPS, 50,000:1 contrast ratio and advanced sound technologies.Extreme VIZIO technology! VIZIO’s XVT series epitomizes cutting edge technology…. |
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Toshiba 46XV640U 46-Inch 1080p Full HD LCD TV with ClearFrame 120 Mhz $1,399.99 If you’re dabbling in high definition content, you’re on the cutting edge. The REGZA 46″ XV is a full HD 1080p ready LCD television, blending superb picture and audio quality and delivering it in a slim and stylish package. Enjoy every drop of detail on the XV series…. |
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Premium Power AC Adapter For Samsung LCD Tv ADP60WBT $35.41 Premium Power AC Adapter For Samsung LCD Tv ADP60WBT |
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7” TFT LCD TV $615.54 7” TFT LCD TV |
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LN32B360 32 LCD TV – 32 – 16:9 – 1366 x 768 – Surround – HDTV – 720p $459.18 Samsung LN32B360 LN32B360 32″ LCD TV – 32″ – 16:9 – 1366 x 768 – Surround – HDTV – 720p |
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UN46B8500 LCD TV – 46 – ATSC – 16:9 – 1920 x 1080 – Surround – HDTV – 1080p $2048.18 Samsung UN46B8500 UN46B8500 LCD TV – 46″ – ATSC – 16:9 – 1920 x 1080 – Surround – HDTV – 1080p |
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17" LCD Monitor Video & TV $2205.91 17″ LCD Monitor Video & TV |
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15" LCD Monitor Video & TV $1188.96 15″ LCD Monitor Video & TV |
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12" LCD Monitor Video & TV $1028.07 12″ LCD Monitor Video & TV |
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20" LCD Monitor Video & TV $3148.43 20″ LCD Monitor Video & TV |
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Chief FWP-110B Swivel for LCD TV Black FWP110B $56.84 Chief FWP-110B Swivel for LCD TV Black FWP110B |
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LG Electronics Stand For LCD TV ST3700K $134 LG Electronics Stand For LCD TV ST3700K |
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KVH TracVision R5SL With 20 Majestic LCD TV $1999 KVH TracVision R5SL with 20 Majestic LCD TV |
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LCD TV TURNTABLES (BLACK) $31.37 FUNCTIONAL, ATTRACTIVE & INEXPENSIVE; POWDER-COATED TO PROVIDE A BEAUTIFUL ;& DURABLE FINISH; OVAL SHAPE DESIGNED SPECIFICALLY TO MATCH THE PLATFORM OF LCD TVS; STAND NOT INCLUDED; BLACK SUBCATEGORY2: TV/COMPONENT FURNITURE. Warranty: FIVE YEARS. |
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Sony 4" LCD Monitor with 8mm Recorder $779.58 Sony 4″ LCD Monitor with 8mm Recorder |
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Sony LMP E150 LCD Projector Lamp LMPE150 $368.12 Sony LMP E150 LCD Projector Lamp LMPE150 |
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Sony LMP C161 LCD Projector Lamp LMPC161 $363.77 Sony LMP C161 LCD Projector Lamp LMPC161 |
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Lenovo LCD Panel 15in XGA (Samsung) 13N7065 $132.26 Lenovo LCD Panel 15in XGA (Samsung) 13N7065 |
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BRAVIA KDL-52EX700 52 LCD TV ATSC – NTSC – 178? / 178? – 16:9 – 1920 x 1080 – Surround, Dolby – HDTV – 1080p $1818.18 Enjoy Full HD 1080p, incredible contrast and smooth motion performance with the slim Edge LED backlit Sony BRAVIA EX700 Series LCD HDTV. Connect to the internet and instantly stream a wide variety of movies, TV shows, videos and music using apps from Netf |
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17" LCD Monitor Video & TV Ceiling mount $2285.31 17″ LCD Monitor Video & TV Ceiling mount |
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17" LCD Monitor Video & TV Wall mount $2285.31 17″ LCD Monitor Video & TV Wall mount |
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15" LCD Monitor Video & TV Ceiling mount $1269.4 15″ LCD Monitor Video & TV Ceiling mount |