ADE3800XT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ADE3800XT

Analog LCD Display Engine for XGA and SXGA Resolutions with Embedded LVDS and RSDS Transmitters

STMicroelectronics 

ADE3800

Register Description by Block

PGEN_P0_SEQ_COL0_COL1 = 70 bar 0 does not block any of the R G B colors

PGEN_P0_COLOR_B_C0 = 00

PGEN_P0_COLOR_G_C0 = FF define color C0 as light green

PGEN_P0_COLOR_B_C0 = 00

PGEN_ENABLE = 01 enable PGEN

This displays a thick green block that surrounds the original picture in the center.

Now, if PGEN_P0_GRADDELTA_G = FF and PGEN_P0_GRADSTEP_X = 05, the solid green is

turned into one linear horizontal shade of green, evenly spread over the horizontal axis from left

(light green) to right (black).

Additionally, if PGEN_P0_MODE = 02, the gradient registers are preset to color C0 each time a new

grid cell is displayed; this gives 8 distinct shades of green (1 per cell) across the display.

Example 2

PGEN_GRID0, 2, 4, 6 = 00 all cells of these grids display the pattern

PGEN_GRID1, 3, 5, 7= 80 1st cell of these grids displays the real picture

PGEN_GRID_X_L = 00, PGEN_GRID_X_H = 05 the 1st cell takes the entire display width

PGEN_GRID_Y_L = 1024 / 8 lines across screen = 80, PGEN_GRID_Y_H = 00 one cell takes 1/8th

of the display height, so that all 8 grids will be displayed

PGEN_P0_MODE = 80 color C0 uses 4 bars (bars 0 1 2 3)

PGEN_P0_SEQ_COL0_COL1 = 74

● bar 0 does not block any of the R G B colors (displays C0 as is)

● bar 1 blocks G and B colors (displays R only)

PGEN_P0_SEQ_COL2_COL3 = 21

● bar 2 blocks R and B colors (displays G only)

● bar 3 blocks R and G colors (displays B only)

PGEN_P0_COLOR_B_C0 = PGEN_P0_COLOR_G_C0 = PGEN_P0_COLOR_B_C0 = 00: C0 is

black

PGEN_P0_GRADDELTA_R = PGEN_P0_GRADDELTA_G = PGEN_P0_GRADDELTA_B = 01: R G

B color components of C0 gradually increase from left to right

PGEN_P0_GRADSTEP_X = 05: shade is evenly spread over the horizontal axis

PGEN_ENABLE = 01 enable PGEN

This displays a complex pattern made of 8 horizontal rows:

● 1st row (= bar 0) displays a shade of white, from left (black) to right (white)

● 3rd row (= bar 1) displays a shade of red, from left (black) to right (light red)

● 5th row (= bar 2) displays a shade of green, from left (black) to right (light green)

● 7th row (= bar 3) displays a shade of blue, from left (black) to right (light blue)

● 2nd, 4th, 6th and 8th rows display the original picture

When displaying the same pattern from an external pattern generator, since each row of each color

is displayed side by side with the same reference shade row generated by the PGEN, defects can

be spotted immediately. This is a very useful test to see possible ADC or panel defects.

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