Willcom D4 Teardown: Design Influenced by Quanta (page 6)
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Next, we disassembled the touch sensor module, which is located on the right side of the LCD panel and used to move the mouse cursor on the screen. The module was probably manufactured by Synaptics Inc. The UTS6680 microcontroller, which is made by IdeaCom Technology Inc of Taiwan, was mounted on the sub-board to control the pen input device.