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TFT LCD controller supports WQVGA

Posted: 26 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LCD controller-driver? TFT LCD?

Renesas Technology Corp. has released the R61517, a single-chip LCD controller-driver that supports amorphous WQVGA (240 x 432 pixels) size TFT color LCD modules. The R61517 further expands the company's lineup of LCD controller-drivers for mobile devices such as cellphones.

R61517 implements single-chip support for WQVGA size screens, which have a 16:9 aspect ratio suitable for mobile TV displays, thus helping reduce the cost of the LCD module. It also has an on-chip RGB independent gamma adjustment function that allows setting of separate gradation generation circuits for red (R), green (G), and blue (B). This enables fine-grained adjustment of RGB gradations to match the color characteristics of the LCD panel or compensate for changes in picture quality due to external lighting. This contributes to excellent color reproduction and superior display quality.

R61517 has an on-chip backlight control (BLC) function. It automatically senses the type of image content being displayed and dynamically controls the backlight brightness and corresponding control data processing to match. Control is performed without having to forcibly change the y-curve, based on the image data brightness information. This avoids adverse effects from changes in the picture quality. The result is a reduction in the power consumption of the LCD module overall while maintaining high picture quality. For example, the overall power consumption of the LCD module when displaying video content is reduced a maximum of 50 percent, and about 30 percent on average, in comparison with earlier Renesas products. The reduction in power consumption helps increase the maximum mobile TV viewing duration. A portion of the image data processing circuit used to implement the BLC function was developed in collaboration with Hitachi Ltd.

R61517 employs an MIPI interface as the system interface with the MCU. It conforms to MIPI-DCS (Display Command Set) and supports MIPI DBI Type B (18/16/9/8bit), MIPI DBI Type C (Option 1 and Option 3), and MIPI-DPI (Display Pixel Interface). This interface makes implementation and design of software and hardware easier than with earlier Renesas products. It increases the reusability and compatibility of mobile device development resources and helps to shorten the time required for development.

Functions are also provided for reducing power consumption, including an eight-color display function and a power management function. These are well suited for applications requiring extended battery drive durations, such as digital mobile phones with color displays, multimedia players, and mobile TV terminals.

Available in a COG package, the enables direct facedown mounting on the glass panel. The R61517 (R61517A0D5) chip with gold bump (zigzag pad arrangement) sells at $2.68 for volume quantities. Sample shipments will begin on November in Japan.

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