London – Renesas Technology Europe has
extended its QVGA single-chip liquid crystal display (LCD) controller/driver line-up with the R61504, which has a
16.77 million colour display capability and supports the Mobile Display Digital Interface (MDDI) high-speed serial
interface standard. The R61504 reduces the component count of a LCD system and therefore reduces LCD module
costs and power consumption. It also incorporates approximately 230 Kbyte of on-chip display RAM. It is
suitable for amorphous TFT colour LCD panels used in mobile phones that offer applications such as high-resolution
cameras, TV display and game functions.
By offering support for 16.77 million
display colours, the R61504 enables high quality display equivalent to that of a PC. 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 noise to be achieved.
The R61504 also features conventional parallel, serial and RGB
interfaces. Connection to a baseband LSI and microcontroller is possible by means of an 8/16-bit high-speed
bus interface and highly efficient transfer can be performed by a high-speed burst RAM write function. In
addition, RGB, Vsync and FMARK interfaces are incorporated as image data interfaces, facilitating support for moving
images featuring smooth motion display.
The new controller/driver incorporates an RGB individual gamma
adjustment function that allows more precise red, blue and green gamma settings. This improves image colour
reproduction and display quality by adjusting settings according to variations in image quality due to LCD panel
colour characteristics or external lighting conditions. An endian-free function is also included. The term
“endian” refers to the order in which data, etc. is stored in memory and has previously been converted
by a microcontroller, for example, to suit the LCD driver. The R61504 includes endian conversion instructions
that enable the conversion to be performed easily by software, making it possible to reduce the load on
microcontroller software and helping to simplify development. |  | |
The
R61504 features nine general-purpose port pins that can be used in various ways, including 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.
A hardware power supply sequencer is incorporated that
controls the LCD drive power supply start-up sequence. There are a number of power supplies and the powering-on
sequence of these has previously been set entirely by the user. 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 start-up sequence and the program only contains a start-up instruction for this sequencer, enabling
user programming errors to be reduced and development efficiency to be improved.
The same 8-colour
display mode, standby mode and deep standby mode as in previous models 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
colour 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 (Chip On Glass) is supported as the mounting
method. Sample shipments will begin in August 2005.
<Specifications > Item | R61504 Specifications | Display size |
240 x 320 pixels | Display colours | 16.77 million colours |
Outputs | 720 source outputs, 320 gate outputs | Display RAM capacity | 230,400 bytes | Display functions | - 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)
| On-chip functions
| - Power supply sequencer
- Endian-free function
| Interfaces | -
80-type interface: 8/16-bit bus
- High-speed moving image interface: 8/16-bit bus
- MDDI
- Instructions/image data both receive-only
- Hibernation support (standby mode)
- High-speed burst
RAM write function: 10 MHz write frequency (normally 6.6 MHz)
| Logic power supply voltage | 2.5 V to
3.1 V | Interface I/O voltage | 1.65 V to 3.1 V | Liquid
crystal drive voltage | 4.5 V to 5.5 V | Gate voltage | Gate on: 9.0 V to 15.0 V Gate off: 10 V to 4 V
| Power-down functions | 8-color display mode, sleep mode, shutdown mode | Shipping form | Chip with gold bumps (for COG mounting) | |
|
| |
|