ACX333AKM |
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* 6 cm (2.4-type)
QVGA transmissive panel
* High brightness and high color purity
* Single 2.9 V power supply operation system
display
* 18-bit RGB digital interface circuit
* Digital VCOM adjustment function
* CPU interface IC included |
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Newly-Developed
System Display |
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Sony has developed
a high-level system display technology (system-on-glass
tech-nology) that forms, as a single integrated
unit, all the LCD drive circuits on the LCD
panel itself. This technology was developed
using Sony's low-temperature polycrystalline
silicon TFT technology, which achieves both
high functionality and high reliability due
to Sony's unique process and device technologies.
The ACX333AKM integrates on the glass substrate
all of the RGB interface and drive circuits,
including a supply voltage generator circuit
(DC/DC converter) that can operate from a single
2.9 V power supply, an 18-bit RGB digital interface
cir-cuit, a reference driver, timing generator,
a VCOM adjustment circuit, and other power supply
system circuits. (See figure 1.) This system-on-glass
technology can create extremely high reliability
modules, since it significantly reduces the
parts count and reduces the number of connections
required. Furthermore, a CPU inter-face function
can be implemented easily by using an interface
IC mounted on the module FPC. |
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Digital VCOM
Adjustment Function |
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The ACX333AKM is capable
of adjusting the opposing electrode potentials
(VCOM) digitally by using the D/A converter
on the glass substrate and the CPU interface
on the FPC*. This allows a compact trimmer-free
LCD module to be implemented.
*: ROM for the VCOM value
settings is required in the external system.
Note that analog adjustment using trimmers (variable
resistors) is also possible without using this
function. |
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Increased
Brightness |
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By making the oxide
film in the transistor circuit thinner in a
newly-developed pro-cess technology, Sony achieved
a significant reduction in the surface area
of the pixel internal Cs (supplementary capacitor)
block. This allowed Sony to achieve an extreme
high aperture ratio in the ACX333AKM, despite
the fact that it has the extremely fine feature
sizes of a 6 cm (2.4-type) QVGA display. By
combining this display with a high-intensity
backlight, Sony achieved a brightness level
increased to 300 nit. |
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High Color
Purity |
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Sony developed new
color filters optimized for the spectral characteristics
of white LED backlights for the ACX333AKM, achieving
both higher transmittance and higher color purity.
As shown in figure 3, the ACX333AKM achieves
an extremely wide color reproduction with a
color NTSC ratio of 60%, a level that is unavailable
in conventional mobile displays. |
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•••• Ms.OGAWA ••••
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System on glass displays
are the new face for cellular phones. These
devices are designed with an emphasis on the
picture quality desired in the future for the
growing range of functions in future cellular
phones, such as digital still cameras, web browsing,
and TV reception. Due to the energy of the project
members, we were able to include many newly-developed
technologies, and we created a product that
is at the leading edge in terms of both picture
quality and module form factor. I strongly recommend
that you take advantage of Sony's LCDs, which
provide bright clear images with natural colors. |
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See
all articles with figures and tables.  |
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Vol.37 |
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