CSOT MT4601B02 – The First 46-inch TFT-LCD Module of China

　　Peng Du1, Jiali Jiang1, Joseph Lin1, Bin Fang2

　　1. China Star Optoelectronics Technology, ACD Dept., Shen Zhen, Guangdong, 518132, E-mail: du_peng@tcl.com

　　2.  China Star Optoelectronics Technology, ADT Dept., Shen Zhen, Guangdong, 518132

　　Abstract:

　　CSOT (China Star Optoelectronics Technology) MT4601B02 is the first 46-inch liquid crystal display TV module designed and produced in Mainland China. At present, it is also the largest module fabricated by G8.5 production line in China. The features of the module include high contrast ratio, high transmittance, fast response time and low color shift design which improves the large viewing angle performance. Besides, it’s also a slim-bezel module with 12mm bezel in source side and 9.9mm in the other side. In addition, this module has shutter glasses 3D function.

　　Key Words: China Star Optoelectronics Technology, High Transmittance, Wide Viewing Angle, Slim-bezel, Shutter Glasses, 3D Display

　　1. Introduction

　　COST(China Star Optoelectronics Technology) located in Shenzhen, which is a manufacturer of LCD TV panels and founded in the end of 2009. CSOT has a G8.5 production line dedicated to fabricating LCD panels from 26 inches to 55 inches. On August 8th, 2011, CSOT launched 32” TV panels, the first product of G8.5 line.

　　CSOT MT4601B02 is the first 46-inch TFT-LCD module fabricated in China. The features of this module include slim border design, excellent large viewing angle performance and high transmittance.

　　2. Slim Border Design

　　In recent years, thin, light and slim TV module is the trend of TFT-LCD manufacturing technology. Slim border design makes TV more fashion and stylish. [1-3]

　　To achieve slim border design, the array design and cell process are very critical, especially for large-size panels, such as shrinking fanout pitch, accurate PI and sealant dispersion. However, these designs may cause serious RC loading and other mura. The low sheet resistance metal films are used to reduce signal distortion. Furthermore, asymmetrical fanout design is applied in the peripheral design to reduce the length and cost of X-board. The border size of CSOT MT4601B02 has been reduced to 12.9mm in source side and 9.9mm in the other side. Related dimensions are shown in Fig.1.

　　Fig. 1 Panel Dimensions and Border Size

　　3. Large Viewing Angle Performance

　　When a TFT-LCD is observed from a large viewing angle, the colors, especially the skin colors will become white. This phenomenon is called color shift or color washout [4]. The main reason is that the Gamma curve (transmittance-gray curve) is distorted while looking at the TFT-LCD panel obliquely. Color shift is more serious in large-size panels.

　　In order to solve this problem, two-area design in each sub-pixel is used in MT4601B02 to prevent gamma curve from being distorted. It improves the large viewing angle performance. Fig.2 shows MT4601B02 being observed from normal viewing angle and obliquely.

　　a. Normal Viewing Angle          b. Viewing Angle of 60°

　　Fig.2 MT4601B02 observed from normal viewing angle and obliquely.

　　4. HVA Technology

　　CSOT has developed its own vertical alignment technology named HVA. The advantages of HVA technology are fast response, high contrast ratio and high transmittance.

　　Response time has been measured. Fig. 3 shows the measured result. The Ton and Toff are about 7ms and 6ms respectively. The average gray to gray response is 6.92ms. Besides, the measured contrast ratio is high up to 4000. This is competitive to current products in the market.

　　Fig. 3 Response Time of MT4601B02

　　Transmittance is the most important performance of a TFT-LCD device. High transmittance will lead to low power consumption and reduce the cost of backlight unit. Improving transmittance was our emphasis during the design phase. Until now, the transmittance of MT4601B02 is higher than 6.0%, and reaches the leading level in the world.

　　5. 3D Display

　　Shutter glasses 3D display function can be activated in 120Hz mode. Shutter glasses can realize 3D display without any loss of resolution (FHD, 1920*RGB*1080), and it also reduces the cost, because there’s no need for pattern retard film [5]. Besides, the large viewing angle performance of 3D function is improved (178°, H / 178°, V). Fig.4 shows MT4601B02 module with 3D function activated.

　　Fig.4 Shutter Glasses 3D Display

　　Conclusion

　　CSOT MT4601B02 is the largest commercial TFT-LCD panel fabricated in mainland China now. Slim border design and 3D are the main features of the TV module product. Large viewing angle performance is improved by low color shift design. Fast response, high contrast ratio and high transmittance are achieved by the application of HVA technology. With shutter glasses technology, 3D display function can be realized with FHD resolution.

　　References

　　1. 谷至華. 薄膜晶體管(TFT)陣列製造技術 [M]. 上海: 復旦大學出版社, 2007.

　　2. 田民波, 葉峰. TFT-LCD面板設計與構裝技術 [M]. 北京: 科學出版社, 2010.

　　3. 戴亞翔. TFT-LCD面板的驅動與設計 [M]. 北京: 清華大學出版社, 2008.

　　4. Seung Beom Park, Jaejin Lyu, et al. A Novel Charge-Shared S-PVA Technology [C], SID2007: 1252-1254.

　　5. Yuichiro Yamada, Kenji Okamoto. Advanced Technologies for 3D Liquid Crystal Television [C]. SID2011: 160-163.

　　華星光電MT4601B02 – 中國第一款46”TFT-LCD模組

　　杜鵬1，姜佳麗1，林師勤1，方斌2

　　1. 深圳市華星光電技術有限公司，陣列彩盒設計部，廣東深圳，518132，E-mail：du_peng@tcl.com

　　2. 深圳市華星光電技術有限公司，先進顯示技術部，廣東深圳，518132

　　摘要：

　　華星光電的MT4601B02模組是中國大陸第一款自主設計，生產的46“液晶顯示模組，另外它也是目前為止中國8.5代線生產的最大的尺寸的模組。這款模組的主要特點包括高對比度，高穿透率，快速響應時間和改善大視角特性的低色偏設計。這是一款窄邊框設計的機種，在source側的邊框寬度為12mm，另外3側為9.9mm。另外，這款模組還可以利用快門式眼鏡來實現3D顯示的功能。

　　關鍵詞：深圳市華星光電技術有限公司，高穿透率，大視角，窄邊框，快門式眼鏡，3D顯示