LCD Display Controller
Figure 3-5. Passive Color Dual Panel Displays Typical Connection
PXA250 Processor
L_DD0 | DU_0 |
L_DD1 | DU_1 |
L_DD2 | DU_2 |
L_DD3 | DU_3 |
L_DD4 | DU_4 |
L_DD5 - Top left Blue for upper panel | DU_5 |
L_DD6 - Top left Green for upper panel | DU_6 |
L_DD7 - Top left Red for upper panel | DU_7 |
L_PCLK | Pixel_Clock |
L_LCLK | Line_Clock |
L_FCLK | Frame_Clock |
L_BIAS | Bias |
L_DD8 | DL_0 |
L_DD9 | DL_1 |
L_DD10 | DL_2 |
L_DD11 | DL_3 |
L_DD12 | DL_4 |
L_DD13 - Top left Blue for lower panel | DL_5 |
L_DD14 - Top left Green for lower panel | DL_6 |
L_DD15 - Top left Red for lower panel | DL_7 |
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Upper Panel
LCD Display
Lower Panel
3.3Active (TFT) Displays
Because data is sent to the panel as raw
Many active displays actually have more than 16 data lines - usually 18 (6 of each color). For these panels it is recommended that the most significant lines of the panel lines are connected to the data lines from the PXA250 applications processor. This maintains the panel’s full range of colors but increases the granularity of the color spectrum with an insufficient number of data lines. All unused panel data lines can be tied either high or low. Other options include tying the LSB of red and blue to the next bit, R1 or B1.
For active displays, connect the pins described in Table
PXA250 and PXA210 Applications Processor Design Guide |