Patent ID: 8587556

Claim:
A display device, comprising: a liquid crystal display (LCD) panel for displaying images, which comprises a first polarizer, a first glass substrate coupled to the first polarizer, a first electrode layer formed on the first glass substrate, a first alignment layer formed on the first electrode layer, a second polarizer, a second glass substrate coupled to the second polarizer, a second electrode layer formed on the second glass substrate, a second alignment layer formed on the second electrode layer, and a liquid crystal layer formed between the first alignment layer and the second alignment layer, wherein the second electrode layer is coupled to the first electrode layer; a first driving circuit configured to provide a first driving signal at a first frequency; a second driving circuit configured to provide a second driving signal at a second frequency, different from the first frequency; a coupling unit coupled to the first driving circuit and the second driving circuit to receive the first driving signal and the second driving signal at the same time and configured to couple the first driving signal and the second driving signal in a frequency domain, and to provide the coupled signal of the first driving signal and second driving signal to both of the first electrode layer and the second electrode layer such that the first driving signal drives the LCD panel for displaying the images, and the second driving signal drives the LCD panel for being touch-sensitive; and a signal separation unit, separate and different from the first driving circuit and the second driving circuit, coupled to at least one of the first electrode layer and the second electrode layer to receive a feedback signal and to separate from the feedback signal a capacitance change signal indicating a capacitance change corresponding to a touch on the LCD panel, the first driving circuit is further configured to separately provide a third driving signal to both of the first electrode layer and the second electrode layer of the LCD panel without going through the coupling unit, in addition to and together with the coupled first and second driving signals, wherein the third driving signal and the first driving signal effect 3D image display.