ACX521AKM |
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* System display (System on
Glass)
* Single 2.75 V power supply operation
* 16-bit RGB digital interface circuit
* Power consumption: 3.5 mW (65K colors, still picture,
full-screen display)
* Low-voltage drive normally black mode
* Narrow frame
* Transflective design |
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System Display |
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Sony has developed a system
display technology (system-on-glass technology) that
can form, in a single unit, the whole LCD drive system
on the LCD panel itself by using Sony's high-performance
high-reliability low-temperature polycrystalline silicon
TFT LCD made possible by unique Sony process and device
technologies. The ACX521AKM includes the following drive
circuits: a power supply generating circuit (DC/DC converter)
that allows single-voltage operation, horizontal drivers
(source drivers) that allow the upper and lower frame
width to be reduced, a 16-bit RGB digital interface
circuit, a reference driver, a timing generator, and
the VCOM drivers. As a result, the ACX521AKM provides
the following advantages.
* High module reliability due to reduced component counts
and reduced number of connections required
* Reduces production lead times and avoids driver IC
procurement risks since no external driver IC is required.
In the near future, Sony is planning to include a wide
range of other functions in system display products,
including memory, command decoders, and photosensors. |
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Single 2.75 V Power Supply Operation |
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Although multiple power-supply
voltages are normally required for LCD drive, the ACX521AKM
includes a power supply generation circuit that is formed
completely from TFT circuits. This allows this device
to implement LCD operation with a single 2.75 V power
supply without requiring any power supply generation
(voltage step-up) circuit on the external circuit board.
The low-voltage normally black LCD newly developed by
Sony and adopted in this display contributes to single-voltage
power supply operation and reduced power consumption. |
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Narrow Frame |
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In the ACX521AKM, Sony achieved
narrow frame specifications that are in no way inferior
to conventional LCDs, namely frame widths of 2.1 mm
at the left and right, 7.3 mm at the top, and 3.2 mm
at the bottom. Since system displays involve a truly
large-scale circuit, they do have the problem that they
require a wide "frame", the width of the display
area and the end of the glass. However, narrow frames
are required in mobile equipment such as cellular phones
due to design considerations. Sony succeeded in reducing
the width of the upper and lower edges of the frame
by adopting a unique circuit designs in the horizontal
drivers, which consist of latch circuits and D/A converters.
Sony also succeeded in reducing the frame width at the
left and right with unique new circuit layouts. |
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••••
Mr.YUDA ••••
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Much of the world's mobile
electronic equipment, cellular phones, PDAs, digital
cameras, and camcorders, uses Sony LCDs. We're committed
to assuring that from now on as well, the beautiful
faces (displays) on the mobile equipment used around
you every day continue to be Sony system displays. |
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See all articles with figures and tables.  |
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Vol.33 |
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