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| Miniature High-Precision 4.6 cm (1.8-type) 118K-Dot Digital Still Camera Color LCD Features a Viewing Area Ratio of 100% ACX312AK The 1.8-type color LCD panel is widely used as the monitor in digital still cameras. Sony has already released the ACX306AK low-temperature polycrystalline silicon TFT LCD as a 1.5-type 118K-Dot miniature high-precision model. Sony has now added the 1.8-type ACX312AK, which provides the same functionality with the same number of dots, to their product line, expanding the Sony lineup of products for use in digital still cameras. s s s s s s 4.6 cm (1.8-type) 118K dots Complete 100% viewing area ratio with 0% overscan High contrast (200:1) and high optical transmittance (8.6%) despite miniaturization Power saving function provides even lower power consumption during standby mode Up/down and/or right/left inversion functions Supports NTSC and PAL Viewing Area Ratio of 100% The ACX312AK achieves a viewing area ratio of 100% by setting the overscan to 0%. This allows all of the image taken by the CCD to be displayed with nothing missing to prevent the loss of critical images. Full Complement of Functions Despite Miniaturization By adopting Sony's TFT polycrystalline silicon technology developed over many years, the ACX312AK manages to provide all of the functions of the conven- tional ACX300 Series products (2.0 type to 3.5 type) despite its ultrasmall form. In particular, it includes up/down and/or right/left inversion functions to increase the degrees of freedom available in end product design. Furthermore, it achieves high contrast (200:1) and high transmittance (8.6%), and is at the top level of number of effective pixels per unit area (115.4 dots/mm2) in the ACX300 Series. As a result, it provides smooth fine-grained images with no apparent dots and a high picture quality. At the same time it can contribute to reduced overall power consumption in end product designs. Improved Ease of Use The CXA3572R provides many advantages over the conventional CXA3522R. (See table 2.) First, the package has been reduced in size from a 72-pin LQFP to a 48-pin LQFP, thus cutting in half the space taken by the IC on the printed circuit board. This increases the degrees of freedom available in end product design. Second, the VCO has been integrated on the chip, obviating the need for an external oscillator circuit and reducing the number of external components required. The previously required PSIG buffer is planned to be integrated as well, allowing a further parts count reduction. Furthermore, since this 1.8-type device has the same number of dots as the conventional 1.5type device, the same printed circuit board can also be used for end products that use a 1.5-type device, thus contributing to reduced design costs when creating a line of end products. System IC V O I C E Of our low-temperature polycrystalline silicon LCD products, the ACX312AK aims to become a de facto standard due to its specialization for use in digital still cameras. This LCD represents the crystallization of efforts and technologies contributed by many engineers, and we are convinced that this device is superior to other manufacturers' LCDs, both in performance and quality. I hope many digital still camera developers will adopt this product. Sony provides the new CXA3572R system IC, which was developed along with the ACX312AK. This system IC integrates the timing generator and the RGB drivers on a single chip. The CXA3572R supports both NTSC and PAL, and accepts either Y/color difference or RGB signals as input. It includes up/down and/or right/left inversion functions to take advantage of the panels' features. Furthermore, it includes power saving functions to reduce power consumption in standby mode even further. (See figures 2 and 3.) PSIG DC DET VCC1 VCC2 +12 V 24 23 22 Picture gain Picture f0 21 +3 V 20 19 18 Mode 17 PSIGbright N.C. G/Y Horizontal level shifter and shift register 16 15 14 13 ATT COM Picture Hue color Hue Color SYNC IN 25 DA OUT 26 DA REF LPF trap LPF SW LPF TRAP ATT ATT DL DL Matrix PSIGBRIGHT PSIGPowerSW Vertical shift register DA R, G, B Cs LC REF 27 PSIG OUT OSD G OSD R OSD B SIG.C R/R-Y B/B-Y 12 G OUT Contrast Userbright USERBRIGHT FILTER 28 Subcontrast Gamma 1 Gamma 2 1 2 Subbright OSD 11 G DC DET 10 R OUT SUBSUB- CONTRAST CONT R CONT B RBBRIGHT BRIGHT SYNC SEP Phase comparator Clock generator VCO ADJ fine IR RP CK SYNC SEL 9 R DC DET 8 B OUT S/H BLIM BLIM RPD 29 GND1 30 Serial I/F DAC 7 B DC DET FRP COM Level shifter COM pad Voltage set-up generation circuit Negative voltage generation circuit SEN 31 SCK 32 SDAT 33 VCO ADJ coarse HD_ CSYNC Analog block 3-V system COM 6 COM 5 GND2 XCLP SH1 SH3 BLK FRP SH2 SH4 XSTBY1 Analog block 12-V system XSTBY2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Digital block 3-V system Serial I/F H. filter 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 4 TEST 3 VST 2 VCK 1 EN VD 34 XCLR 35 POF 36 +3 V PLL counter 0V Timing generator s Figure 1 ACX312AK Block Diagram +3 V 0V 37 VDD 38 HDO 39 VDO 40 RGT 41 VSS 42 HCK1 43 HCK2 44 HST 45 VDD 46 WIDE 47 DWN 48 VSS s Figure 3 CXA3572R Block Diagram VDD POF*2 3V Video signal*1 (RGB or Y/color difference) (NTSC/PAL) R, G, B VST, VCK, EN, DWN, WIDE, HST, HCK, RGT CXA3572R CSYNC or HD, VD*1 PSIG, VCOM LCD panel ACX312AK (1.8 type) ACX306BK (1.5 type) *1 If the internal sync separation circuit is not used, either CSYNC or HD and VD are used as the input sync signal. If the internal sync separation circuit is used, sync on green (RGB) or Y (Y/color difference) is used as the input sync signal. *2 Pin used for power saving mode. SDAT, SCK, SEN Three-wire serial communication (microcomputer or other device) s Figure 2 ACX312AK/306BK Drive System Block Diagram (single-chip structure) s Table 2 Model Package Input method s Table 1 Digital Still Camera LCD Specifications Comparison Model Screen size Number of active dots (H x V) Pixel arrangement Optical transmittance (%) Contrast ratio Supply voltage Display method Panel dimensions (W x H x t (mm)) Power consumption Number of colors System IC (mW) (V) ACX306AK 3.8 cm (1.5 type) 118K dots (490 x 240) RGB delta 6.5 200 : 1 12 NTSC/PAL 38.0 x 32.6 x 2.06 43 Analog full color CXA3572R ACX306BK 3.8 cm (1.5 type) 118K dots (490 x 240) RGB delta 7.5 200 : 1 12 NTSC/PAL 38.0 x 32.6 x 2.06 43 Analog full color CXA3572R ACX312AK 4.6 cm (1.8 type) 118K dots (490 x 240) RGB delta 8.6 200 : 1 12 NTSC/PAL 43.6 x 35.9 x 2.06 43 Analog full color CXA3572R Drive System IC Specifications Comparison CXA3522R 72-pin LQFP CXA3572R 48-pin LQFP Y/color difference or RGB NTSC/PAL 3 V and 12 V Internal Planned to be provided built in Available Available Y/color difference or RGB NTSC/PAL Display method Supply voltage VCO PSIG buffer INPUT SEL*1 SYNC SEL*2 3 V and 12 V External External Not available Not available *1: Input signal level setting in RGB mode *2: On/off setting for the internal sync separation circuit |
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