On-cell & In-cell 創新技術設計講座 探究明日觸控競爭力 - 可攜式產品觸控面板之技術規格需求與產業競爭發展態勢 報告人 : 貢振邦工研院顯示中心 日期 : 18, 04, 2013 1 何謂觸控技術 2 1
Need and Application-1 + Wireless Data = Communication 3 Need and Application-1 + = Foldable Device 4 2
Need and Application - 2 5 Need and Application -3 3
Controller and Driver 7 Functional Block Diagram Memory Rx (AFE) ADC 32Bit MCU Serial Out TP Tx Timing Controller HD/VD Rx : LNA, Noise Reduction, Parallel vs. Scan, Tx : High Voltage Drive, Parallel vs. Scan, CDMS(Code Division Multiple Sensing), TC : Ext. Sync MCU : Firmware (Interpolation, Palm/Water Rejection, ) 8 4
Source : ISSCC 2012 A Capacitive Touch Controller Robust to Display Noise for Ultrathin Touch Screen Displays ; Samsung 9 A Highly Noise-Immune Touch-1 Source : ISSCC 2013 A Highly Noise-Immune Touch Controller Using Filtered-Delta-Integration and a Charge- Interpolation Technique for 10.1-inch Capacitive Touch-Screen Panels ; KAIST and Silconworks 10 5
A Highly Noise-Immune Touch-2 Source : ISSCC 2013 A 55dB SNR with 240Hz Frame Scan Rate Mutual Capacitor 30 24 Touch-Screen Panel Read-Out IC Using Code-Division Multiple Sensing Technique ; KAIST and Zinitix 11 Device - Structure 12 6
觸控面板技術趨勢 AUO : One Glass Solution (OGS), Advance Post Process (APP) CMO : Window Integrated Sensor (WIS) Wintek : Advanced Technology Touch (ATT) TPK : Touch On Lens (TOL) Melfas : Direct Patterned Window (DPW) Touch Panel (Glass or PET) Cover Glass with TP Samsung : G2 良率? Cover Glass 可靠性? Display Module One Glass Structure Display Module Cover Glass Display Module with TP In-Cell Structure Single Glass Process Sheet Type Process Chemical Strength Soda-Lime Glass Strengthened Glass Sheet Base Process Shaping and Forming strength loss High Cost Sensor Device with Cover Glass 7
Single Glass Process Piece Type Process Shaping and Forming Soda-Lime Glass Chemical Strength Low Temperature Process Alignment Throughput High Cost Product Price vs. Technology Source : 2012 Touch Panel Issue and Cost/Industry Analysis 03/2012 8
Device TC Layout 17 PCTP Sensing Electrode Layout 自電容及互電容 Snow Flake 9
TC Layout for Pen Tracking Technology vs. Production 工程師 / 實驗室 雛型技術 / 產品 資料庫 / 倉庫 觸控技術是一項系統技術而非僅元件技術或材料技術 Specification ( 系統廠商主導 ) Price ( 元件廠商主導 ) 供應商產能 供應商數目 工廠 量產產品 產品最低規格 最低成本 10
Low Cost Technology SITO-1L 2.5D / 3D Cover Lens Sensing Device Substrate 2.5D / 3D OPS Low Cost Gesture Touch Slim 21 Single Layer TC Layout 22 11
Device TC Material 23 光學特性 穿透率 霧度 色偏值 電器特性 阻抗值 製程整合性 耐化性 耐熱性 圖案化能力 產品要求 耐候性 均勻性 價格彈性 觸控面板透明導電電極的規格 12
常見透明導電電極技術 材料 金屬氧化物 奈米線 奈米顆粒 有機導電材料 結構 片材 網格 製程 真空濺鍍 濕式塗佈 網印 凹版 凸版 Metal Oxide Transparent Conductor Probe Wavelength (nm) 26 13
CNT Transparent Conductive Film High transparent conductivity Surface resistance 500 Ω/ Total light transmittance >90% Neutral color High bend durability Φ=5 mm;20 times R/R0 < 1.1 High reliability (Heat & humidity etc.) 60 ;90% RH;500 hr R/R0 <1.2 Laser patterning 27 CNT Touch Panel 28 14
Flexible Transparence Conductive Material Ag Nano Wire Transmission Rate : > 98% at 30Ω/ Flexibility : 6mm Radius and 350g stress force TPK + Cambrios -> TPK FilmSolutions Inc. 29 LG Announces World s First ClearOhm Film-based AiO PC Fast response enabled by low resistance ClearOhm film Windows 8 Certified Thin and light sensor unachievable with ITO Validates performance and value proposition for large area touch panels LG V325 23 AiO PC 15
Flexible Touch Sensor Xsense Base on roll to roll metal mesh technology embedded in poly (ethylene terephthalate) (PET) plastic substrate, to replace traditional ITO material Implement truly unique industrial designs with narrow borders or edgeless Enabled to develop products with curved surfaces, or even add functionality on edges 31 Flexible Transparence Conductive Material Metal Mesh 5 μm tracks on a 200 μm pitch gives a net transmission of 95% At 50 mω/ track resistance mesh has an effective conductivity of 2 Ω/ 32 16
Metalized Mesh (Etched Copper Metalized Film) Cu layer thickness:1.5~ 2.5μm Good peel-off strength and chemical strength Black surface is available 33 New Transparent Conductive Film 34 17
Now PET and Tempered Glass Issues Optical Performance Cost Saffity Next COP? Colorless PI? PMMA? 50um or < 50um? Substrate 35 Conclusion 人機介面技術是一項系統技術而非零組件技術 應用面 可撓式裝置開啟軟性投射式電容觸控面板的機會 Windows 8 開啟大尺寸投射式電容觸控面板的機會 裝置面 觸控面板廠的差異化在於成本的掌控能力 ( 材料與製程 ) 觸控晶片廠的差異化在於透明導電電極圖騰及晶片電路技術 模組廠的差異化在於市場行銷及顯示模組貼合能力 36 18
In-Cell Structure 37 In-Cell Self-Capacitive Sensor 1 Source : SID 2011 Toshiba Mobile Display Co. 19
In-Cell Photo Sensor - 1 Semiconductor Energy Laboratory Co., A 6 inch XGA LCD touch screen with optical sensors and global shutter in its pixels, using oxide semiconductor (OS) FETs has been developed. A few steps are added to a normal fabrication process of the OS FETs in order to make photodiodes (a-si). Source : Hikaru Tamura et al., High Reliable In-Ga-Zn-Oxide FET Based Electronic Global Shutter Sensors for In-Cell Optical Touch Screens and Image Sensors ", SID Symposium Digest, pp.729-732, 2011 In-Cell Photo Sensor 2 Samsung Electronics The photosensor (a-sige:h) and its circuit were fabricated on the upper glass (CF glass), located on the BM area The pixel TFT of lower glass (TFT glass) The LED backlight where IR LEDs In order to avoid the noise by visible light, a band pass filter (BPF)was added under the sensor TFT. Source : Samsung Electronics in SID 2012 20
In-Cell Photo Sensor 3 W/L : 50/15 Source : Samsung Electronics in SID 2012 Thanks for your attention 42 21