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                      | HITACHI HOME | UP | SEARCH | HITACHI

                      News Release ^
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                      April 15, 1999

                      Hitachi Releases XGA TFT LCD Driver Providing High-Quality Panel Display

                      -Output voltage variation reduced to +/-2 mV through use of Hitachi's proprietary offset cancellation method-

                      Hitachi, Ltd. (TSE: 6501) today announced the HD66323 and HD66325 as data line drivers 
                      for XGA-size*1 large-screen TFT LCD panels, which feature
                       a low output voltage variation of +/-2 mV achieved through the use of Hitachi's proprietary 
                      offset cancellation method.  Sample shipments will begin in July 1999 in Japan.
                      
                      The HD66323 and HD66325 provide a uniform, high-quality panel display, while at 
                      the same time achieving 25% lower power consumption than the previous Hitachi model.
                      
                      Notebook PCs, and space-saving desktop PCs and monitors, equipped with a TFT LCD 
                      panel are coming into increasingly wide use, bringing a growing demand for larger XGA- 
                      and SXGA-size*2 screens that offer higher definition.  In line with this trend, There is an 
                      increasing demand for special-purpose drivers to drive the data lines of high-definition TFT 
                      LCD panels.
                      
                      Also, with the increasing size and definition of TFT LCD panels, a need has arisen for data 
                      line drivers offering high drive capability to handle the panel load, together with drive 
                      voltage uniformity and lower power consumption.  Following Hitachi's entry into the market 
                      with the release of the HD66322 384-output, dot-inversion type driver for XGA-size color 
                      TFT LCDs, the company is now releasing the HD66323 and HD66325, which offer 
                      improved drive voltage uniformity and lower power consumption.
                      
                      The HD66323 and HD66325 are data line driver suitable for use with XGA-size large-
                      screen, high-definition color TFT LCDs.  These drivers accept 6-bit digital data per pixel, 
                      generate voltages for 64 gradations, and provide a 260,000-color display.  They have 384 
                      outputs incorporating 384 6-bit D/A converters and op-amps, enabling XGA data line drive, 
                      which requires 3,072 (1,024 dots x 3) outputs, to be handled by only eight drivers.
                      
                      One important characteristic of a data line driver is output voltage uniformity.  With 
                      Hitachi's previous model, variation in the input/output offset voltages of the 384 op-amps 
                      incorporated into the chip resulted in a drive voltage variation of around +/-10 mV.  
                      
                      These new drivers, however, use a proprietary offset cancellation method that enables drive 
                      voltage variation to be kept to +/-2 mV.  The input/output offset voltage polarity can be 
                      reversed between frames and between lines, providing a uniform, high-quality panel display.
                      
                      In addition, as a means of reducing chip area and power consumption, an improved paired-
                      amp design is used in which op-amp circuits are shared between adjacent outputs, resulting 
                      in a 20% smaller chip area and 25% lower power consumption than Hitachi's previous 
                      model.
                      
                      Although the HD66323 and HD66325 have different input pin arrangements and interface 
                      specifications, they have identical functions and TFT LCD drive performance in order to 
                      provide compatibility with the earlier model.  With the use of a TCP*3 package, using 50 um 
                      pitch technology for the inner leads, the design of the HD66323/325 drivers minimizes both 
                      chip area and TCP area.
                      
                      Future plans call for an enhanced product lineup attuned to the trends in TFT LCD panel 
                      displays, and their use in an increasing variety of applications, based on Hitachi's proprietary 
                      offset cancellation drive method, together with the paired-amp system and multi-pin 
                      technology.
                      
                      Notes:  1. XGA (Extended Graphics Array): A display definition standard.
                                 XGA is a registered trademark of IBM.  The display size is 1,024 x 768 dots.
                      	2. SXGA (Super Extended Graphics Array): A display definition standard.  
                      	   The display size is 1,280 x 1,024 dots.
                      	3. TCP (Tape Carrier Package): A package mounted on a thin-film tape, allowing  
                            	   ultra-thin type mounting (1 mm or less).
                      
                      <Typical Applications>
                      Products with a built-in TFT LCD panel (notebook PCs, space-saving desktop PCs, 
                      monitors)
                      
                      <Prices in Japan>
                      Product Code		Sample Price (Yen)
                        HD66323		       750              
                        HD66325		       750
                      
                      
                      
                      


                      WRITTEN BY Secretary's Office
                      All Rights Reserved, Copyright (C) 1999, Hitachi, Ltd.

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