News Release: The former Hitachi Displays

May, 21 2010

Development of Touch Panel IPS LCD for Mobile Phones with Independent Protection Plate
- Decreases touch panel disposal during the assembly process for reduced total cost of touch-panel LCDs -

Hitachi Displays, Ltd. (President: Yoshiyuki Imoto, hereafter referred to as Hitachi Displays) has developed a touch panel IPS LCD for mobile phones with an independent protection plate that reduces the amount of noise emitted when displaying images on the LCD to less than half that of existing models through the application of a highly sensitive touch panel control IC. Up until now, mobile phone construction has consisted of a touch panel integrated with the protection plate making it necessary to dispose of the touch panel together with the plate when defects such as scratches or soiling occurred during the assembly process of mobile phone manufacturers. However, this newly developed display allows for the replacement of only the protection plate. Due to this innovation, disposal of touch panels is decreased for a reduced total cost of touch-panel LCDs.
With this display, Hitachi Displays is contributing to the spread of value-added touch-panel LCDs for mobile phones.

In recent years, touch-panel LCDs have been garnering a great deal of attention while the number of mobile phone manufacturers adopting such screens continues to increase. It is expected that the smart phone will be a leading force in maintaining the high growth rate of such touch panels. It is especially expected that the adoption of electrostatic capacitance touch panels will increase as this type of touch panel can perform the type of multi-touch operations that emerge as user interfaces became increasingly sophisticated, such as the use of multiple fingers touching the display simultaneously to expand an image or to move an object on the screen.
Conventional touch panels consist of the touch panel attached to a protection plate that is separated from the TFT LCD in order to prevent noise emitted from the TFT LCD and to further increase touch panel sensitivity. This type of construction makes it necessary to replace both the protection plane and attached touch panel if the protection plate is scratched, soiled or otherwise defective during the assembly process by mobile phone manufacturers. Due to the fact that electrostatic capacitance touch panels that enable multi-touch operations have a higher cost compared to that of resistive touch panels that cannot perform multi-touch operations, touch panel disposal has been a cause of increased costs for mobile phone manufacturers.

To counter this, Hitachi Displays developed a touch-panel LCD in which the touch panel is separated from the protection plate and the protection plate has an independent structure. For this display, an innovative driving method was applied resulting in a reduction of the noise emitted from the IPS LCD to less than half that of conventional models, and a control IC has been adopted to further increase sensitivity.
Additionally, making the protection plate independent increases the degree of freedom for design aspects of the protection plate such as material used and color, and also makes it easier to apply a waterproof design.

This newly developed touch-panel IPS LCD will be exhibited at SID (Society for Information Display) 2010 from May 25 to 27 in Seattle (US).

Hitachi Displays will continue to strive to improve development and sales of slim/high-technology products that have excellent cost performance. We shall also continue to advance in terms of customer support including touch-panel control systems as a means to contribute to the unification of the customer supply chain and quality control.

Comparison of the construction of this newly developed touch-panel LCD with that of conventional models