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Renesas Technology Releases R61504 Single-Chip TFT Controller/Driver Supporting 16.77 Million Color Display and MDDI for Mobile Phone QVGA-Size TFT Color Liquid Crystal Display Panels
− QVGA single-chip liquid crystal display driver lineup extended by addition
of MDDI compatible product −
Tokyo, June 30, 2005 −− Renesas Technology Corp.
today announced the R61504 liquid crystal display (LCD) controller/driver,
providing QVGA*1-size screen drive and 16.77 million color display
capability plus high-speed serial interface standard MDDI (Mobile Display
Digital Interface)*2 support in a single chip, as a driver for
amorphous TFT color LCD panels used in mobile phones. Sample shipments will
begin in Japan in August 2005.
The R61504 offers the
following features.
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(1)
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QVGA-size screen drive and 16.77 million color display capability with a
single chip
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Renesas Technology has previously released the R61505 as a single-chip LCD
driver for QVGA-size panels supporting 260k-color display. The new R61504
extends the number of display colors to 16.77 million, enabling high-quality
display equivalent to that of a personal computer to be achieved. The
two-product lineup allows a user to select the most suitable model for the
application system specifications. Use of the R61504 in cases previously using
a two-chip configuration comprising a gate driver and source driver enables
the number of component parts to be reduced, making it possible to cut liquid
LCD module costs and power consumption.
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(2)
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Support for MDDI high-speed serial interface standard
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MDDI is a small-amplitude-differential high-speed serial interface standard.
The R61504 can be directly connected to an MDDI compatible baseband LSI,
enabling the elimination of a previously necessary bridge chip and so reducing
LCD panel module and system costs.
The R61504 is also provided with
conventional parallel, serial, and RGB interfaces, allowing the same
connection method as at present.
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(3)
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RGB individual gamma adjustment function for higher image quality
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The R61504 incorporates an RGB individual gamma adjustment function that
allows R (Red), B (Blue), and G (Green) gray-scale generation circuits to be
set individually. This enables image color reproducibility to be improved by
adjusting RGB gray-scales more precisely, and, together with the 16.77 million
color display capability, makes it possible to achieve higher display quality.
Gray-scale adjustment is programmable, allowing switching to suit external
lighting conditions.
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(4)
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On-chip general-purpose ports for fewer signal lines
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The R61504 is provided with nine general-purpose port pins that can be used in
various ways. Possible uses include receiving backlight, incoming call LED,
vibrator, and similar control signals by the MDDI or another interface from a
baseband LSI, and outputting those control signals from these ports. This
enables the number of signal lines to be reduced.
When the MDDI is
used, it is also possible to transfer instructions and image data to a sub LCD
panel module via these general-purpose ports.
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<Product Background>
As mobile phone
applications expand into such areas as high-resolution cameras, TV display
functions, and game functions, larger volumes of display information are being
handled and main screen resolution is improving to provide high-quality image
displays, leading to increased use of the 240 x 320-pixel QVGA size. At the
same time, various styles of mobile phone have appeared on the market,
including clamshell and rotatable LCD panel models. Connection between the
baseband LSI and LCD panel is currently performed via a parallel interface,
but with the large number of signal lines involved it is expected to be
difficult to increase transfer speed and handle wiring routing as display
information volumes continue to increase in the future. For this reason, the
industry is moving ahead with the development of high-speed serial interfaces
that use serial transfer requiring far fewer signal lines than parallel
transfer, and are also capable of transferring large volumes of data.
Following on from Renesas Technology's earlier development of the R61505 as a
single-chip LCD driver for QVGA-size amorphous TFT LCD panels, the company has
now developed the R61504 single-chip LCD controller/driver supporting the MDDI
high-speed serial interface standard.
<Product Details>
The R61504 provides single-chip
drive of a 240 x 320-pixel resolution QVGA-size screen. It has approximately
230 Kbytes of on-chip display RAM and offers 16.77 million color display
capability, enabling high display quality to be achieved.
Support for the MDDI small-amplitude-differential high-speed serial interface
standard allows direct connection to an MDDI compatible baseband LSI,
eliminating the need for a previously necessary bridge chip. The MDDI standard
also offers a major reduction in the number of signal lines compared with the
conventional parallel transfer method, and enables low EMI*3 noise
to be achieved.
The same kind of interfaces as at present are
also provided. Connection to a baseband LSI and microcontroller is performed
by means of an 8/16-bit high-speed bus interface, and highly efficient
transfer can also be performed by a high-speed burst RAM write function. In
addition, an RGB interface, Vsync*4 interface, and FMARK*5
interface are incorporated as image data interfaces, facilitating support for
moving images featuring smooth motion display.
Functions are
also included that help to achieve high image quality and simplify
development. An RGB individual gamma adjustment function is provided that
allows more precise R, B, and G gamma settings, helping to improve image color
reproducibility and achieve high display quality by making settings according
to variations in image quality due to LCD panel color characteristics or
external lighting conditions.
An endian*6-free
function is also included. The term “endian” refers to the order in which
data, etc., is stored in memory, and may differ depending on the system or
CPU. The endian has previously been converted by a microcontroller or some
other means to suit the LCD driver. The R61504 is provided with endian
conversion instructions that enable endian conversion to be performed easily
by software, making it possible to reduce the load on microcontroller software
and helping to simplify development.
A hardware power supply
sequencer is also incorporated that controls the LCD drive power supply
startup sequence. There are a number of LCD drive power supplies, and the
powering-on sequence of these power supplies has previously been entirely set
by the user by means of a program. However, this has led to increased
development times due to the occurrence of programming errors. With the
R61504, an on-chip hardware sequencer handles the power supply startup
sequence, and the program only contains a startup instruction for this
sequencer, enabling user programming errors to be reduced and development
efficiency to be improved.
The same 8-color display mode,
standby mode, and deep standby mode as in previous products are provided as
functions for reducing power consumption. Use of these modes makes it possible
to achieve low current dissipation equivalent to that of a color STN liquid
crystal panel, helping to extend the battery life of mobile phones and similar
devices.
Chip short sides have been kept down to 2 mm or less
in size, contributing to the implementation of narrow-framed LCD panels for
mobile phone use.
COG*7 is supported as the
mounting method.
Future development plans call for major
extension of the product lineup to keep pace with evolving market needs,
including the development of QVGA class models based on the R61504.
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Notes:
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1.
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QVGA: A display definition standard of 240 x 320 pixels
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2.
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MDDI (Mobile Display Digital Interface): A high-speed serial interface
standard drawn up by the VESA (Video Electronics Standards Association), a
standardization organization of the video devices for PCs, WSs, and so on.
VESA URL: http://www.vesa.org/
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3.
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EMI (electromagnetic interference): A generic term for electromagnetic
disturbance or interference caused by emissions from an electronic device
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4.
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Vsync (Vertical Synchronizing signal): A signal for vertical timing when
drawing a display screen
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5.
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FMARK : A signal output at the frame cycle signal (frame marker) output
position in the frame alternation image drawing method
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6.
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Endian: The method used when storing a multi-byte numeric value in memory.
The term “big-endian” is used when the MSB (most significant bit) is in a
lower address, and “little-endian” when the LSB (least significant bit) is in
a lower address.
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7.
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COG (Chip On Glass) : A mounting method in which a chip with gold bumps is
directly mounted face-down on the LCD glass substrate
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* Product names, company names, or brands mentioned are the property of their
respective owners.
<Typical Applications>
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Mobile phones, PDAs, etc., with a 240 x 320-pixel resolution display function
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<Prices in Japan> *For Reference
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Product Name
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Shipping Form
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Sample Price [ Tax Included ] (Yen)
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R61504 (R61504A0C3)
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Chip with gold bumps
(for COG mounting)
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1,000 [ 1,050 ]
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<Specifications>
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Item
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R61504 Specifications
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Display size
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240 x 320 pixels
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Display colors
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16.77 million colors
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Outputs
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720 source outputs, 320 gate outputs
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Display RAM capacity
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230,400 bytes
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Display functions
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• Window address function (rectangular RAM address area writing)
• Partial display function
• 8-color display function
• RGB individual gamma adjustment function
• Resizing function
(1/2, 1/4)
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On-chip functions
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• Power supply sequencer
• Endian-free function
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Interfaces
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• 80-type interface: 8/16-bit bus
• High-speed moving image
interface: 8/16-bit bus
• MDDI
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- Instructions/image data both receive-only
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- Hibernation support (standby mode)
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• High-speed burst RAM write function: 10 MHz write frequency
(normally 6.6 MHz)
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Logic power supply voltage
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2.5 V to 3.1 V
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Interface I/O voltage
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1.65 V to 3.1 V
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Liquid crystal drive voltage
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4.5 V to 5.5 V
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Gate voltage
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Gate on : 9.0 V to 15.0 V
Gate off : –10 V to –4 V
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Power-down functions
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8-color display mode, sleep mode, shutdown mode
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Shipping form
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Chip with gold bumps (for COG mounting)
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Information contained in this news release is current as of the date of the
press announcement, but may be subject to change without prior notice.
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