Hi, I'm using FT811, when i use gradient color via CMD_GRADIENT there're some horizontal darker line/strip appearing on the screen. This is only happening when i use gradient, and only for red color (blue and green no darker line/strip occuring).
Here's my LCD parameter:
// LCD display parameters
UINT16 lcdWidth = 800; // Active width of LCD display
UINT16 lcdHeight = 480; // Active height of LCD display
UINT16 lcdHcycle = 928; // tot length of line (hoffset + data + front porch)
UINT16 lcdHoffset = 88; // start of active/data line ((hsync1 - hsync0) + back porch)
UINT16 lcdHsync0 = 0; // start of hsync
UINT16 lcdHsync1 = 48; // end of hsync
UINT16 lcdVcycle = 525; // total number of line (voffset + data + front porch)
UINT16 lcdVoffset = 32; // start of active/data line ((vsync1 - vsync0) + back porch)
UINT16 lcdVsync0 = 0; // start of vsync
UINT16 lcdVsync1 = 4; // end of vsync
UINT8 lcdPclk = 2; // Pixel Clock = 60 MHz / 2 = 30 MHz (LCD spec min-typ-max 20-33-50MHz)
UINT8 lcdSwizzle = 0; // Define RGB output pins
UINT8 lcdPclkpol = 1; // PCLK polarity is on the falling edge
And I was observing, if I make the clock higher (PCLK = 1) the line become lesser, but if I reduce the clock (PCLK = 3, 4, 5) the dark strip become many.
And the dark strip only happen for horizontal gradient applied, it's smooth if i use vertical gradient.
What could be the cause of this? How can i eliminate this completely?
Is this due to FT811 not a true RGB only 18 bit?
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Topic: Darker horizontal line/strip when using gradient for red color only (Read 9364 times)