High Picture Quality 3.4 cm (1.35-Type) 1.05M-dot Wide XGA HDTV Projector LCD for the Coming Digital Age LCX037BL ■ Achieves high transmittance (17%) as a 3.4 cm (1.35-Type) 1.05M-dot wide XGA LCD. ■ Improved contrast and completely horizontal crosstalk-free due to display the adoption of the Dot-Line inversion drive method. ■ a new 3.4 cm (1.35-Type) 720P digital HDTV LCD that adopts Sony’s unique high picture quality circuit tech- Vertical crosstalk-free up to the HD format due to the adoption of the 2STEP dot sequential precharge method. ■ Brightness shading-free due to the adoption of OCS (on-chip spacer) technology. nology and optimal pixel design technology. ■ Vertical crosstalk-free due to adoption of a high light resistance device structure (DMS*1) tor LCD, a device that will be indispensable for home ■ Up/down and/or right/left inversion functions theater displays in the digital age. ■ Built-in input level conversion circuits As the trend towards digital TV broadcasting accelerates, the needs for large screen high picture quality displays are growing rapidly. The HDTV LCD projector is expected to become one of the mainstays of this area. To respond to these hopes, Sony has now developed This device, the LCX037BL, is an HDTV front projec- 3.4 cm (1.35-Type) LCD for 720P Digital HDTV High Picture Quality Achieved Sony has achieved an aperture ratio of 52% and an optical transmittance of 17% in a wide XGA display (1366H × 768V) LCD with 1.05M dots. Achieving this required the introduction of a unique new Sony-developed structure (DMS), the development and introduction of a new fabrication process, and the use of high-precision LCD orientation technology. As a result, this device can provide bright fine-grained display of digital HDTV broadcasts, and can create bright but subtle pictures even on a large screen. V O I C E We developed the LCX037BL with the goal of achieving the superb picture quality required to satisfy the home theater market. We developed a new LCD drive technique, a new device structure, and a new system IC for this product. All of us in the development team strove to improve the LCD characteristics as much as possible. We are confident that the LCX037BL will be rated number one in the home theater market. By adopting Sony’s unique newlydeveloped picture quality improving “Dot-Line inversion drive method,” complete crosstalk-free is achieved. (See figure 1.) Due to this drive technology and an optimized pixel design that reduces the amount of light leaking around pixels, Sony was able to improve the contrast to over 350:1 when VSIG = ±5.0 V. Furthermore, to achieve vertical crosstalk-free display even for video formats such as HDTV that have an extremely short blanking period, Sony developed the new 2STEP dot sequential precharge drive method. (See figure 2.) The LCX037BL achieves high uniformity while supporting even higher brightness levels by using both the high light resistance DMS structure and the OCS (on-chip spacer) structure in the surface of the device structure. (See figure 3.) Additionally, by using the CXD3503R color shading correction IC, end products can provide finegrained correction not only for the color shading due to the LCD panel itself, but also that due to the optical system. This allows end products to provide excellent image uniformity. Ease of Use At the same time, Sony has also developed the new CXD3504R as a system IC for the LCX037BL, which adopts a new drive method. A system structure consisting of the CXA3512R highvoltage sample-and-hold IC, which has an excellent reputation, and the CXD2467AQ, which integrates both a programmable TG and RGB drivers on a single chip, can create an environment that can take full advantage of the characteristics of this LCD panel. (See figure 4.) *1 DMS: Dual Metal Shield Vg2 H H H H Vg2 L L L L Vg2 L H L H Vg3 L L L L Vg3 H H H H Vg3 H L H L Vg4 H H H H Vg4 L L L L Vg4 L H L H Vg5 L L L L Aperture ratio Good (52%) Inferior (32%) Good (52%) Picture quality (Including horizontal crosstalk) Fair Good Good 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 COM PAD COM PAD Input signal level shifter circuit ■ Figure 1 Dot-Line Inversion Drive Method H shift register V shift register H L H L SIG12 SIG11 SIG10 SIG9 SIG8 SIG7 SIG6 SIG5 SIG4 SIG3 SIG2 SIG1 COMR PSIG4 PSIG3 PSIG2 PSIG1 VSSG Vg1 V shift register H H H H Up/down and/or right/left inversion control circuit Vg1 VCOM SOUT VVDD VSS PST DWN VST VCK ENB COML VSS Vg1 HCK2 HCK1 HST RGT HVDD Dot-Line inversion Dot inversion Line inversion Opposing substrate P shift register OCS Metal shielding film 2 COM PAD COM PAD ■ Figure 2 LCX037BL Panel Block Diagram Inorganic leveling Tr TFT substrate Metal shielding film 1 ■ Figure 3 TFT Cross Section Structure 1366 × 768 dots Digital signal driver D/A S/H driver CXA3197R CXA3512R CXA3197R CXA3512R CXA3197R CXA3512R CXA3197R CXA3512R CXA3197R CXA3512R CXA3197R CXA3512R Wide XGA mode 6 R-in 16 LCX037BL 6 G-in 16 Selective delay line B-in 16 CXD2467AQ 60 CXD3504R VSYNC 60 6 LCX037BL 6 1280 × 720 dots 720P digital HDTV mode HSYNC 6 LCX037BL 1/2 FRP, PRG, ENB MCK X'tal CXD3503R ■ Figure 4 LCX037BL System Block Diagram 6 Timing pulse 1024 × 768 dots XGA mode ■ Figure 5 Display Correspondences