Display; The Display Controller - HP Integral Personal Computer Service Manual

Punctionlll DHCI'lption 1·11
5.9 Display
The Integral pe uses a
255
by 512-pixel electroluminescent panel display. The
display controller
is
located on the logic B PCA. The electroluminescent panel and its associated driver circuitry are located
in the
display assembly.
Figure 5-3 is the display block diagram.
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'1 .... W. Dis,,,, Block Diagram
1.1.1 The Display Controll.r
The display controller consists of the following components:
• The GPU (graphics processing unit) miaoprocessor. This miaoprocessor (Ie U1 on the logic B peA)
is specially designed as a display controiler.
• The display memory. This is a 32K-byte memory organized as a 16K by 16-bit bank of dynamic
RAM (lCs U3 through U6 on the logic B peA).
• The control logic for the display memory (ICs U2, U11, U12, U13, and U16 on the logic B peA).
• The data shifter (ICs U7 and U8 on the logic B PCA), which consists of tWo 8-bit shift registers that
convert the outgoing data to serial form.
• The timing
circuit
(lCs U9, UI0, and U13 on the logic B PCA), which synchronizes the output of
data to the display assembly.