LCD Projector Calculator
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 Original InFocus TVT 6000 Projector RemoteFREE SHIP  US $29.97
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 Sharp Projector Remote G1414CESA FREE SHIP US $29.97
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 SHARP LCD Projector Remote RRMCG1480CESA FREE SHIP US $19.97
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 PANASONIC ET LAX100 replacement lamp 2000hrs 220w US $330.06
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 PANASONIC ET LAX100 replacement lamp 2000hrs 220w US $330.06
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 PANASONIC ET LAX100 replacement lamp 2000hrs 220w US $330.06
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 SHARP LCD Projector Remote Control G1461CESAFREE SHIP US $29.97
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 NEC LT57LP REPLACEMENT LAMP FOR LT157 LT158 New US $359.27
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 EPSON ELPLP23 V13H010L23 EMP 8300 lamp for 8300nl US $576.09
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 Mitsubishi VLT XD280LP Replacement Lamp F XD250U XD250U G XD280U XD280U G US $256.34
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 Mitsubishi VLT XD280LP Replacement Lamp F XD250U XD250U G XD280U XD280U G US $256.34
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 EPSON ELPLP23 V13H010L23 EMP 8300 lamp for 8300nl US $576.09
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 Ultra ULT31924 Projection Screen 49x87 100 Diagonal US $89.64
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 Ultra ULT31924 Projection Screen 49x87 100 Diagonal US $89.64
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 EPSON ELPLP23 V13H010L23 EMP 8300 lamp for 8300nl US $576.09
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 Ultra ULT31924 Projection Screen 49x87 100 Diagonal US $89.64
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 V7 VPL1160 1N 150 W Replacement Lamp for VT48 VT49 VT57 VT58 and VT59 US $208.20
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 NEC VT70LP replacement lamp for vt47 vt570 US $275.06
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 NEC VT70LP replacement lamp for vt47 vt570 US $275.06
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 NEC LT57LP REPLACEMENT LAMP FOR LT157 LT158 New US $359.27
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 NEC LT57LP REPLACEMENT LAMP FOR LT157 LT158 New US $359.27
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 V7 VPL1276 1N 300 W Replacement Lamp for NEC NP1000 and NP2000 3000 Hour US $229.99
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 V7 VPL147 1N 200W Replacement Lamp for Sanyo PLC XP17 PLC XP18 2000Hour US $198.89
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 V7 VPL1282 1N 300 W Replacement Lamp for Sanyo PLC XP57 PLC XP57L 1500 Hour US $208.20
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 V7 VPL149 1N 200 W Replacement Lamp for Sanyo PLC XP40 PLC XP45 2000 Hour US $186.17
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 V7 VPL590 1N 300W Replacement Lamp for Sanyo PLC EF60 PLC XF60 2000 Hour US $260.89
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 EPSON V12H001K60 soft carrying case US $33.97
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 TARGUS TPJ700 mediamate projector notebook rolling case US $92.47
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 EPSON ELPKS61soft shoulder carrying case for projectors US $78.37
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 TARGUS TPJ700 mediamate projector notebook rolling case US $92.47
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 EPSON V12H001K60 soft carrying case US $33.97
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 EPSON ELPKS61soft shoulder carrying case for projectors US $78.37
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 V7 VPL1160 1N 150 W Replacement Lamp for VT48 VT49 VT57 VT58 and VT59 US $208.20
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 V7 VPL1160 1N 150 W Replacement Lamp for VT48 VT49 VT57 VT58 and VT59 US $208.20
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 CHIEF SLR 6000 LCD CEILING MOUNT for use with EPSON 811P US $22.99
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 Panasonic ET LE20 Zoom Projector Lens PT L750 L785U US $450.00
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 NEW Panasonic LRQ90044 LCD Projector REMOTE PTL759A PTL759E PTL759U PTL759VU XU US $49.99
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 V7 VPL609 1N 250W Replacement Lamp for Epson EMP 7800 EMP 7850 3000 Hour US $197.18
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 V7 VPL1369 1N 230W Replacement Lamp for Mitsubishi SD420 SD430 XD420 4000Hour US $297.43
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 V7 VPL706 1N 310W Replacement Lamp for Hitachi CP X1250 BenQ PB9200 US $302.81
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 V7 VPL697 1N 250W Replacement Lamp for Sanyo PLC XT10A PLC XT11 2000Hour US $186.17
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 V7 VPL141 1N 200W Replacement Lamp for Sanyo PLC SU30 PLC SU31 2000 Hour US $186.17
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 V7 VPL1075 1N 180 W Replacement Lamp for Acer PD100 PD100D PD100P 3000Hour US $231.33
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 V7 VPL1137 1N 200 160W Replacement Lamp for Mitsubishi SD110 XD100U XD110 4000H US $219.22
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 V7 VPL1467 1N 300 W Replacement Lamp for Sanyo PLC XT20 PLC XT21 2000 Hour US $208.20
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 V7 VPL1219 1N 300 W Replacement Lamp for Mitsubishi WD2000 XD1000U 5000Hour US $325.90
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 V7 VPL1252 1N 200W Replacement Lamp for Mitsubishi HC1100 HC1500 HC910 3000Hour US $196.97
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 TARGUS TPJ700 mediamate projector notebook rolling case US $92.47
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 EPSON V12H001K60 soft carrying case US $33.97
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 EPSON ELPKS61soft shoulder carrying case for projectors US $78.37
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 EPSON ELPLP41 replacement lamp for powerlite s5 77c US $174.16
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 EPSON ELPLP41 replacement lamp for powerlite s5 77c US $174.16
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 EPSON ELPLP41 replacement lamp for powerlite s5 77c US $174.16
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 PEERLESS PRS UNV S ceiling projector mount silver new US $113.39
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 V7 VPL1467 1N 300 W Replacement Lamp for Sanyo PLC XT20 PLC XT21 2000 Hour US $208.20
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 V7 VPL1219 1N 300 W Replacement Lamp for Mitsubishi WD2000 XD1000U 5000Hour US $325.90
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 V7 VPL1252 1N 200W Replacement Lamp for Mitsubishi HC1100 HC1500 HC910 3000Hour US $196.97
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 V7 VPL147 1N 200W Replacement Lamp for Sanyo PLC XP17 PLC XP18 2000Hour US $198.89
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 V7 VPL149 1N 200 W Replacement Lamp for Sanyo PLC XP40 PLC XP45 2000 Hour US $186.17
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 V7 VPL590 1N 300W Replacement Lamp for Sanyo PLC EF60 PLC XF60 2000 Hour US $260.89
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 V7 VPL609 1N 250W Replacement Lamp for Epson EMP 7800 EMP 7850 3000 Hour US $197.18
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 V7 VPL697 1N 250W Replacement Lamp for Sanyo PLC XT10A PLC XT11 2000Hour US $186.17
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 V7 VPL1137 1N 200 160W Replacement Lamp for Mitsubishi SD110 XD100U XD110 4000H US $219.22
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 V7 VPL1276 1N 300 W Replacement Lamp for NEC NP1000 and NP2000 3000 Hour US $229.99
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 V7 VPL1282 1N 300 W Replacement Lamp for Sanyo PLC XP57 PLC XP57L 1500 Hour US $208.20
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 V7 VPL706 1N 310W Replacement Lamp for Hitachi CP X1250 BenQ PB9200 US $302.81
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 V7 VPL1369 1N 230W Replacement Lamp for Mitsubishi SD420 SD430 XD420 4000Hour US $297.43
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 V7 VPL1075 1N 180 W Replacement Lamp for Acer PD100 PD100D PD100P 3000Hour US $231.33
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 V7 VPL141 1N 200W Replacement Lamp for Sanyo PLC SU30 PLC SU31 2000 Hour US $186.17
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 V7 VPL141 1N 200W Replacement Lamp for Sanyo PLC SU30 PLC SU31 2000 Hour US $186.17
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 V7 VPL1075 1N 180 W Replacement Lamp for Acer PD100 PD100D PD100P 3000Hour US $231.33
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 V7 VPL1467 1N 300 W Replacement Lamp for Sanyo PLC XT20 PLC XT21 2000 Hour US $208.20
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 V7 VPL1252 1N 200W Replacement Lamp for Mitsubishi HC1100 HC1500 HC910 3000Hour US $196.97
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 V7 VPL1219 1N 300 W Replacement Lamp for Mitsubishi WD2000 XD1000U 5000Hour US $325.90
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 V7 VPL147 1N 200W Replacement Lamp for Sanyo PLC XP17 PLC XP18 2000Hour US $198.89
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CASIO UNVEILS NEXT-GENERATION GRAPHING CALCULATOR -- PRIZM
Layman's Guide to LCD
Before we begin to understand the working mechanism behind the LCD, we must first recall the characteristic of the three physical states: solid, liquid and gaseous. In the solid state, molecules orientate and vibratein their respective position. In the liquid state, the molecules could move from one place to another.
LCD or Liquid Crystal Display works in a state in between solid and liquid. In this obscure state, the molecules could maintain their orientation as in a solid and yet, are able to move to various position, thus similar to the molecules in the liquid state.
Liquid crystal is very sensitive to temperature changes. This aspect made them being more similar to the liquid state because, only a little energy is needed to make the molecules move. As a result, only a small amount of electrical current is needed to produce a small amount of heat to alter the molecular positions of the liquid crystal. This unique characteristic enables this technology to be created for light weight construction such as home entertainment, wrist watch, calculators and portable gaming devices. The low power consumption has also enabled LCD to be make into much wider screen size as compared to the ancient CRT (Cathode Ray Tube). How does a LCD produces colour? An electrically modulated optical devices such as our laptop and television monitor, is made up of a large number of pixels filled with liquid crystals. Thus all is needed, is a backlight or a light source projector to shine against these pixels to produce the desired colour images or even monochrome for that matter.
About the Author
I have a website cum blog called Sphere Screen Resource Center which updates on the latest happening in the area or screen technology. My website: http://spherescreen.com/
WHAT IS meant by optimum screen size for a home projector?
I've been looking at some of the screen size calculators for home projectors that are online and at 18 feet viewing distance I'm getting a suggested screen size of 56" x 100". I'd like to know WHAT determines the optimum screen size. Not HOW to get it, but rather WHAT it is. Why wouldn't 60" x 107" be better at the same distance?
I'm using a Sony BRAVIA VPL-AW15 LCD Projector 16:9
I'd like someone to define what it is. What determines it?
In your context, optimum screen size relates to the aspect ratio, viewing distance, image resolution, and to a lesser degree secondary factors such as screen gain, projector brightness. and screen door effect. It's actually a balancing act. Read on.
First, recognize there is no absolute standard for determining screen size (after all different people have different preferences), BUT there are guidelines for the viewing angle (angle subtended from the viewing position by width of the screen) such as those defined by THX (1st link. Horizontal viewing angle of 40 degrees or less, 15 degree max angle to top of screen) and SMPTE (minimum horizontal viewing angle of 30 degrees).
An obvious result of this is that the perceived screen size (i.e. viewing angle) will vary with distance, and for a constant viewing angle at differing viewing distances the screen size must vary. So for example, a 100" screen at 12 ft would give the same viewing angle as a 50" screen at 6 ft. This is the fundamental reason that there is an optimum screen size for any viewing distance (or more accurately a size range, since personal preference must be allowed for).
Aspect ratio comes into this since screen size is often defined based on the diagonal size of a screen and aspect ratio impacts on this dimension. See the 2nd link for a calculator that takes this into account.
Finally, of the 3 primary factors, image resolution matters because the human eye can resolve detail atfor 20/20 vision) about 1/60 degree of arc. For any image resolution (e.g. 720 or 1080) there will be a distance range where higher resolution can be perceived. See the article at the 3rd link for the full discussion, but as a projector user the important point is that at THX (or SMPTE) optimum distances / screen size the highest resolution possible is recommended ... and these days that means 1920x1080.
Secondary considerations also bear on this question as follows. Projector brightness impact on how bright the image will be at a certain distance. Since image brightness has a recommended minimum and maximum (12-22 ft-lamberts, see 4th link) you don't want to be too far back (brightness drops off with distance) or project on too big a screen (brightness drops with larger screen size). Projectorcentral.com's projector calculator (5th link) is useful here since it shows (caution: based on manu published specs) brightness level as a function of throw distance, screen gain and screen size ... but don't confuse this with optimum screen size.
Higher screen gain can be used to componsate somewhat for low brightness but at the risk of adversely impacting the image through hot-spotting, limited viewing angle and colour shifts).
Finally, "screen door effect" (SDE) must be taken into account when considering minimum viewing distance for any screen size. SDE is visible at close viewing distances as black or dark grey lines around the individual pixels of the image. Different projectors vary in their tendency to show SDE ... with LCOS being the least and LCD and DLP being the most suceptible. Your projector has a recommended (See last link) minimum viewing distance of 1.8x screen width to avoid seeing SDE.
So, bottom line ... there is no single optimum screen size, but there is a minimum and maximum based on viewing angle, SDE effect, projector brightness, etc. Within this range it comes down to personal preference (and physical limitations such as room size).
Hope this helps clarify the interrelationships.
