antistress a écrit a écrit :
Ce mec me tue. Où trouve t il tout ça ?
il doit avoir une version light des logiciels espion du FBI et scanner le net en permanence...
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Je dirais même plus! 
ClairVoyante Laboratories develops and licenses proprietary technology to the flat panel display industry that provides Four Fold Resolution Improvement of color sub-pixel displays. Licenses are available to manufacturers and integrators of color flat panel displays and controllers as well as software providers. The company is committed to research and development to continue to offer the best technology to its clients.
Core Technology
The PenTile Matrix? arrangement of color sub-pixels, shown here, lowers the cost of displays by reducing the number of the more expensive column data drivers, replacing them with less expensive row gate drivers. The advantage of the PenTile Matrix? sub-pixel arrangement, beyond the reduction in cost, is the significant increase in image quality using ClairVoyante? sub-pixel rendering, a proprietary two dimensional sub-pixel rendering algorithm made possible by the unique arrangement of sub-pixels, that doubles the addressable resolution in each axis, doubles the Modulation Transfer Function (MTF) while providing anti-aliasing. Modulation Transfer Function is the number of lines and spaces displayable on a panel. Thus, for example, an SVGA display with PenTile Matrix? architecture and ClairVoyante? sub-pixel rendering will approach, and in some respects surpass, the image quality of a conventional UXGA display.
Conventional rendering on RGB Stripe panel
Sub-pixel rendering on RGB Stripe panel
Sub-pixel rendering on PenTile Matrix
Shown above is 8-point font type rendered on LCD screens, magnified to show its structure. For reference this is a Times New Roman font type: ? A ? . Note that fonts and graphics on conventional panels have limited resolution. Sub-pixel rendering on conventional panels increases the ?addressability? in the horizontal axis, lowering the phase error of pixel location, to improve the image quality, but it does not increase the Modulation Transfer Function (MTF). Sub-pixel rendering on a PenTile Matrix? panel doubles the resolution in both axis, both addressability and MTF, even for saturated red or green, to provide Four Fold Resolution Improvement at the same cost as conventional panels. An additional benefit is derived from the larger aperture ratio providing increased brightness.
To reach the highest resolution the PenTile Matrix? display is capable requires sub-pixel rendering. ClairVoyante? sub-pixel rendering algorithm defines a logical pixel at each red and green sub-pixel location. The blue does not have a logical pixel associated with its position; it is shared by the surrounding four logical pixels. Each logical pixel assigns a weighted mapping of the conventional software logical pixel's three color values, RGB, with the color sub-pixels on the display.
To illustrate, shown above is a single logical pixel showing a single bright white dot centered on the green sub-pixel. The green sub-pixel is set to 50%; the four surrounding red sub-pixels are set to 12.5%, while the blue is set to 25%. Thus, the energy of the original white dot is spread over five sub-pixels in a gaussian spot, much like that displayed by CRTs. Note that the blue is treated separately from the red and green. The red and green combined add up to 100%. While the blue is simply 25%, one fourth, of the total energy available to it, since it is shared with four logical pixels and carries only chroma information.
When logical pixels are displayed next to each other, the values of the overlapping logical sub-pixels add. Thus, if all of a given area of the display is white, the values for each of the sub-pixels add up to 100%. Calculating the value of each sub-pixel at first appears complicated, but in fact the reverse is true. The value of any given sub-pixel is simply half of the input value of the original software logical pixel at that location with the rest of the energy coming from the surrounding four software logical pixels. The algorithm is extremely simple and fast, involving simple shift division and addition. This algorithm may be implemented in software, firmware, or hardware with ease.
Color Display Pixel Arrangements
Color pixel arrangements for displays must satisfy the basic requirement of allowing the colors to blend by being in close proximity. They must also be evenly distributed to maintain color value across the display. The best arrangements surround any given color with the other two.
The conventional color display for a laptop computer uses three sub-pixels; red, green, blue. These are placed in lines, stripes, in the vertical direction since this will allow assignment of constant color to each column and allow the panel to be interfaced in a manner similar to CRTs. These columns may have different widths to provide color balance by adjusting the area of each color. Three sub-pixels, one of each color, in a row combine to form a logical pixel. Each color is bracketing on either side with one of the two other colors.
To lower the cost, the panel may be fabricated with three color pixels instead of sub-pixels. This uses one-third the number of column drivers than the RGB stripe arrangement. For color blending the best arrangement is to form color triads. This surrounds each color pixel with three each of the two other colors. This system is popular for LCD television displays.
The row electrodes may be straight while the columns zigzag back and forth. Since the same column driver is turning on different colors at different locations and times, the triad system requires slightly higher overhead to multiplex the color signals.
One advantage of the triad arrangement over the RGB sub-pixel stripe arrangement is less area is lost to borders (spaces) between sub-pixels leading to higher fill factors for greater brightness.
A principle disadvantage of the triad is the reliance of the blue pixel to carry high-resolution luminance information, a task that it cannot fulfill due to limitations in the human vision system. The blue pixel represents a loss of 1/3 of the logical pixel information, significantly reducing the image quality. The triad configuration also has 1/3 less full color resolution in one axis as compared to the other.
The triad arrangement can be ?squeezed? in the horizontal axis to increase the number of pixels by 50% to compensate for the loss of information due to the blue pixels. This "Delta Triad" arrangement is popular in LCD viewfinders for digital still and video cameras.
The PenTile Matrix? color pixel arrangement uses a ?checker board? pattern of alternating red and green pixels to carry the logical pixel information, while reducing the resolution of the blue information by half compared to the red and green, matching the human visual system. The blue now serves only low-resolution chroma information. Each color is surrounded by the other two colors.
The PenTile Matrix? color pixel arrangement shares the color triad arrangement?s reduced cost and increased brightness from reduced loss to borders. Its advantage over the delta triad system is that the logical pixels are in an orthogonal array -- which is expected for computer graphics -- with no loss of information, since the blue sub-pixel is not required to carry high-resolution luminance information. In terms of image quality, the PenTile Matrix? arrangement is superior to the delta triad or stripe panel. Thus, the PenTile Matrix? is the architecture of choice for both computer and digital photographic applications.
Theoretically, the PenTile Matrix? arrangement of color sub-pixels provides increased flexibility in adjusting the ratio of cost to performance. For example, in the case of a 15? 1600 x 1200 UXGA panel (see table below) there is a saving of 2800 data drivers while maintaining the same performance. Assuming a data driver cost of $.0145(US) per data driver, this translates to a savings of $40.00(US). At an estimated cost for the panel described above of $500.00(US) translates to an 8% overall savings, this savings is scalable and not likely to be superseded by other technological innovations. On the other hand in the PDA market where performance is a significant factor, a 160 x 160 Pentile panel would give the same performance as a 320 x 320 conventional striped panel display while still costing slightly less. With a larger aperture ratio utilizing the PenTile Matrix? there are also potential additional savings in backlighting costs and/or power usage. Additionally, there are minimal changes in manufacturing process or materials technology.
To allow comparison of image quality of the PenTile Matrix? color pixel arrangement using ClairVoyante? sub-pixel rendering, the comparison displays should have the same size and pitch as comparable high addressable resolution and Modulation Transfer Function (MTF) displays. Consider a PenTile Matrix? SVGA panel. With sub-pixel rendering the MTF and addressability is 1600 X 1200, exactly the same as the UXGA. The image will thus be far better than SVGA, as detailed as UXGA but with some softening, anti-aliasing, of the image. However, there will also be improvements in luminance. These trade offs are considered a function of value.
The table below lists driver usage for varying display types:
Type Data drivers Gate drivers Total drivers
UXGA 1600 x 3 x 1200 4800 1200 6000
PenTile Matrix? SVGA/UXGA
800 x 5 x 600
1600 x 1.25 x 1200 2000 1200 3200
SVGA 800 x 3 x 600 2400 600 3000
Shown above is a rough layout of the PenTile Matrix? for a-Si AMLCD. Not shown, for clarity, are the storage capacitors for the sub-pixels. The two column data lines of the blue pixels are tied together and driven by a single driver. The blue pixels in a row are selected by alternating row gate lines. The red and green columns and rows are selected in the conventional manner by the data and gate lines as shown.
The layout uses standard design rules for a standard production fabrication process. No process changes are expected. This allows nearly any AMLCD fabrication line to produce PenTile Matrix? panels
[edtdd]--Message édité par Beavis and Butt-head--[/edtdd]
