Toshiba Develops 7-inch Multi-Touch LTPS TFT LCD Panel

Toshiba Mobile Display has developed a 7-inch, 1024x600 low-temperature poly-silicon (LTPS) TFT LCD panel for vehicle-mounted and industrial uses that enables multi-touch input without the need for an additional touch panel.

The technology enables an integrated touch panel function by forming the display pixel electrodes and TFT within the LCD panel using LTPS TFT technology and creating a detecting circuit for electrostatic capacitance changes between the electrodes and the peripheral object (i.e. your fingers). Compared to conventional LCDs with an external touch panel, the thickness is reduced by 57 percent to approximately 1 mm, the weight is reduced by 48 percent to 225 g and the surface reflection ratio is reduced by 10 percent. The smaller size enables the design of more compact products for mobile applications, reduces the impact on the environment by saving resources and power, and provides clear images with minimal reflection of natural light even in a bright environment.

To enable the screen panel to respond easily to light finger touches, it is essential to suppress possible interference with various signals in the LCD panel. To address the problem, TMD has developed a proprietary sensor circuit, taking advantage of LTPS TFT technology. Specifically, an amplifier circuit is formed in the pixels to amplify the signals, which are then detected by the sensor for output, providing a configuration to precisely transmit sensor signals to the outside of LCD panel. This helps achieve consistent and fast-responding touch panel operation.

This technology will be exhibited at SID 2011 International Symposium, Seminar and Exhibition from May 17 to May 19, 2011 in Los Angeles, Calif., USA.

Source: Toshiba Mobile Display

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