High Transmittance 6.25 cm (2.5-type) Transmissive Color LCD Panels ACX307AK ACX308AK ■ High transmittance achieved by using low-temperature polycrystalline silicon TFT technology. ACX307AK: 9.0 % ACX308AK: 10.5 % ■ Low power consumption: 50 mW (When a 12 V power supply is used) 120K-dot ACX307AK and the 60K-dot ACX308AK LCD ■ Analog full color display panels, which provide identical functionality and have the ■ Wide-screen display function ■ Up/down and/or right/left inversion functions The 2.5-type color LCD panel is widely used as the monitor in digital video cameras. Sony has already released the 200K-dot ACX300CK highresolution low-temperature polycrystalline silicon TFT LCD. Now, Sony is expanding its product line by releasing the same external dimensions as the ACX300CK. By releasing the new ACX307AK and the ACX308AK products in addition to the previously released 200K-dot highresolution ACX300CK, Sony now provides a product line of three 2.5-type color LCD panels for AV applications that are compatible in size and shape but offer differing numbers of active dots. This allows our customers to expand their end-product lines while using only low-temperature polycrystalline silicon LCD panels, and increases flexibility in end product design. Furthermore, the panel external size can also be matched to that of amorphous silicon LCD panels, thus allowing these products to flexible respond to needs for interchangeability. V O I C E Although up to now we have focused on high-resolution devices in our low-temperature polycrystalline silicon LCDs, in our current project, we developed popular devices, the ACX307AK and the ACX308AK. These devices make superlative low-temperature polycrystalline silicon LCD panels available for a wide range of products, from popular models to highclass models. High Optical Transmittance Achieved As a result of optimal pixel design in the context of Sony’s unique lowtemperature polycrystalline silicon TFT technology, the ACX307AK and the ACX308AK achieve the high aperture ratios of 73% and 81%, respectively. Additionally, Sony has adopted a new pixel structure that significantly increases the optical transmittance as compared to conventional amorphous silicon LCD panels of which the same number of pixels. In particular, the ACX307AK achieves 9.0% and the ACX308AK achieves 10.5%. This means that these are “even brighter” LCD panels. (See table 1.) Extensive Functionality and Improved Ease of Use In addition to the up/down and/or right/ left inversion and wide display functions provided by conventional products, Sony has developed and adopted voltage step-up power supply and negative voltage generation circuits to reduce the external power supply and to improve the ease of use of these products. (See figure 1.) Sony is also planning to develop a new single chip IC that integrates both timing generator and control functions on the same chip to make drive circuit design far simpler. (See figure 2.) +12.0 V Horizontal level shifter and shift register +12.0 V +3.0 V PSIG VDD SLVSG 1 µF Buffer Vertical shift register COM Cs RED Y/color difference R/G/B LC GREEN VDDG BLUE COM Rext Cext/Rext New single-chip IC HST HCK1 HCK2 VST Vertical level shifter Zener diode RD 3.3 µm Cext LCD panels ACX300CK ACX307AK ACX308AK VCK Voltage set-up generation circuit Negative voltage generation circuit DWN EN VSSG RGT COM pad REF WIDE TESTL COM VST VCK EN DWN VDD VSS VDDG VSSG SLVSG WIDE HST REF TEST Cext/Rext HCK2 HCK1 PSIG GREEN RED BLUE RGT TESTR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ■ Figure 1 Panel Block Diagram ■ Figure 2 System Block Diagram ■ Table 1 6.25 cm (2.5-type) Transmissive LCD Panel Module structure Screen size ACX300CK ACX307AK ACX308AK 6.25 cm diagonal 6.25 cm diagonal 6.25 cm diagonal 60,000 (280 × 220) 200,000 (880 × 228) 120,000 (560 × 220) Screen aspect ratio 4:3 4:3 4:3 Pixel arrangement RGB delta RGB delta RGB delta 179 × 170 Number of active dots (H × V) 56.75 × 163.75 90 × 170 Aperture ratio (%) 67 73 81 Optical transmittance (%) 8.2 9.0 10.5 200 : 1 200 : 1 200 : 1 12 12 12 NTSC/PAL NTSC/PAL NTSC/PAL 61.6 × 49.3 × 2.2 61.6 × 49.3 × 2.2 61.6 × 49.3 × 2.2 0.06 0.06 0.06 Analog full color Analog full color Analog full color Dot pitch (µm) Contrast ratio Supply voltage (V) Display method Panel dimensions (W × H × t (mm)) Power consumption (W) Number of colors VSS 1µF Zener diode RD 2.7 µm