Patent ID: 8466886
Filing Date: 2013-06-18
Classification: G06F

Abstract:
1. A liquid-crystal display panel comprising: gate lines each serving as a row-direction line which is one of the rows of a two-dimensional matrix; data signal lines each serving as a column-direction line which is one of the columns of said two-dimensional matrix; a plurality of liquid-crystal pixel sections which are laid out to form said two-dimensional matrix and each placed at the intersection of one of said gate lines and one of said data signal lines; chopper-type comparators each connected to one of said data signal lines and each used for converting the value of a sensor signal read out from one of said liquid-crystal pixel sections connected to said data signal lines into a binary value; and a shift register for converting outputs of said chopper-type comparators from parallel data into serial data and outputting said serial data, wherein each individual one of said liquid-crystal pixel sections contains a liquid crystal provided between a pixel electrode and a facing electrode facing said pixel electrode, each individual liquid-crystal pixel section includes a pressure sensor for sensing an applied pressure by detecting whether said pixel electrode and said facing electrode are in a state of being brought into contact or non-contact with each other, and during a period in which said pixel electrode is in a state of being connected to said data signal line connected to said individual liquid-crystal pixel section by a control signal asserted on said gate line connected to said individual liquid-crystal pixel section, a liquid-crystal driving signal is supplied to said individual liquid-crystal pixel section through said data signal line, or said sensor signal indicating whether said pixel electrode and said facing electrode are in a state of being brought into contact or non-contact with each other is read out from said individual liquid-crystal pixel section through said data signal line connected to said individual liquid-crystal pixel section; wherein said chopper-type comparator includes: a first capacitor with a specific node thereof selectively receiving said sensor signal or a first reset electric potential; a second capacitor with a specific node thereof selectively receiving said sensor signal or a second reset electric potential different from said first reset electric potential, the other node thereof connected to the other node of said first capacitor and the capacitance thereof different from the capacitance of said first capacitor; an inverter with the input thereof connected to said other nodes of said first and second capacitors; and a switch device for connecting said input of said inverter to the output of said inverter or disconnecting said input of said inverter from said output of said inverter, and wherein said first reset electric potential is an electric potential having a phase opposite to the phase of an electric potential appearing at said facing electrode whereas said second reset electric potential is said electric potential appearing at said facing electrode.