參數(shù)資料
型號(hào)： GM2125
廠商： Electronic Theatre Controls, Inc.
英文描述： ANALOG INTER FACE XGA/SXGA ONPANEL LCD PANEL CONTROLLER
中文描述： 模擬國(guó)際米蘭的XGA / SXGA ONPANEL液晶顯示器控制器
文件頁(yè)數(shù)： 31/54頁(yè)
文件大?。?/td> 1339K
代理商： GM2125
***
Genesis Microchip Confidential ***
gm2115/25 Preliminary Data Sheet
June 2002
29
C2115-DAT-01B
4.7.2 Horizontal and Vertical Shrink
A shrink function may be performed on the input data. This is an arbitrary horizontal active
resolution reduction to between (50% + 1 pixel) to 100% of the input. For example, this
allows SXGA 1280 pixels to be displayed as 1024 (XGA).
The gm2115/25 provides an arbitrary vertical shrink down to (50% + 1 line) of the original
image size. Together with the arbitrary horizontal shrink, this allows the gm2115/25 to
capture and display images one VESA standard format larger than the native display
resolution. For example, SXGA may be captured and displayed on an XGA panel.
4.7.3 Moiré Cancellation
The gamma curve and other non-linearities can affect the energy distribution of pixels when
scaled to different areas of the screen. This is an example of the Moiré effect. The
gm2115/25 has hardware features to negate the Moiré effect, improving the scaling quality.
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The gm2115/25 has the capability to completely bypass internal processing. In this case,
captured input signals and data are passed, with a small latency, straight through to the
display output. The gm2115/25 is also able to bypass the zoom filter and the gamma LUT.
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The gm2115/25 provides an 8 to 10-bit look-up table (LUT) for each input color channel
intended for Gamma correction and to compensate for a non-linear response of the LCD
panel. A 10-bit output results in an improved color depth control. The 10-bit output is then
dithered down to 8 bits (or 6 bits) per channel at the display (see section 4.10.3 below). The
LUT is user-programmable to provide an arbitrary transfer function. Gamma correction
occurs after the zoom / shrink scaling block. If bypassed, the LUT does not require
programming.
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The Display Output Port provides data and control signals that permit the gm2115/25 to
connect to a variety of flat panel or CRT devices. The output interface is configurable for 18
or 24-bit RGB pixels, either single- or double-pixel wide. All display data and timing signals
are synchronous with the DCLK output clock.
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