Epson Research and Development
Page 97
Vancouver Design Center
11.2.3 TV Filters
The S1D13506 is designed with three filters which improve TV picture quality.
• Flicker Filter.
• Chrominance Filter.
• Luminance Filter.
Each filter is independent and can be enabled/disabled separately. The TV picture quality
varies depending on the actual picture displayed (static image, moving image, number of
colors etc.) and may be improved using the filters.
Flicker Filter
The Flicker Filter is controlled by the Display Mode Select bits (REG[1FCh] bits 2-0). It
reduces the “flickering” effect seen on interlaced displays caused by sharp vertical image
transitions that occur over one line (e.g. one pixel high lines, edges of window boxes, etc.).
The Flicker Filter may be used to for both composite video and S-video formats.
Note
The CRT/TV PCLK 2X Enable bit (REG[018h] bit 7) must be set to 1 when the Flicker
Filter is enabled.
Chrominance Filter
The Chrominance Filter is controlled by the TV Chrominance Filter Enable bit
(REG[05Bh] bit 5). It adjusts the color of the TV, reducing the “ragged edges” seen a the
boundaries between sharp color transitions. The Chrominance Filter may improve the TV
picture quality when in composite video format.
Luminance Filter
The Luminance Filter is controlled by the TV Luminance Filter Enable bit (REG[05Bh] bit
4). It adjusts the brightness of the TV, reducing the “rainbow-like” colors at the boundaries
between sharp brightness transitions. The Luminance Filter may improve the TV picture
quality when in composite video format.
For further information on the TV filters, see the S1D13506 Hardware Functional Specifi-
cation, document number X25B-A-001-xx.
11.2.4 Examples
Example 21: Enable the TV display and set the Flicker Filter. Assume the TV timing
registers are already programmed.
1. Enable the TV with Flicker Filter enabled. REG[1FCh] is set to 06h.
2. Enable the CRT/TV PCLK 2X bit (REG[018h] bit 7). REG[018h] bit 7 is set to 1b.
Programming Notes and Examples
Issue Date: 01/02/06
S1D13506
X25B-G-003-03
EPSON [ EPSON COMPANY ]
