Patent ID: 8519926
Filing Date: 2013-08-27
Classification: G09G

Abstract:
1. A liquid crystal display (LCD) device comprising: an LCD panel on which a plurality of gate lines and data lines intersect with each other and a TFT is formed at each intersection, to define images; a data driving unit that supplies a gradation voltage to the LCD panel through a gamma voltage generating unit, wherein the gamma voltage generating unit is inside the data driving unit; a gate driving unit that supplies a gate pulse to each gate line on the LCD panel; and wherein the gamma voltage generating unit comprises a reference voltage generating unit that divides a power source terminal voltage applied from an external power source unit via at least 10 serial resistance; a switching unit interworked with the reference voltage generating unit and having a plurality of switching elements; and a register unit interworked with the switching unit and storing gradation voltage selection data from the timing controller; and a gradation voltage generating unit having at least 64 serial resistance that re-divides the voltage outputted from the switching unit according to the gradation voltage selection data from the register unit; an EEP-ROM (Electrically Erasable Programmable ROM) formed on a main PCB stores an address of the register unit and 8-bit gradation voltage selection data for controlling the switching unit; wherein the timing controller transits each 1-byte signal for setting device ID, for setting an address of the register in the device and for transmitting the gradation voltage selection data to the gamma voltage generating unit; and wherein the timing controller primarily reads out 8-bit gradation voltage selection data from the EEP-ROM, upon the initial driving, using an IIC (Inter-Integrated Circuit) communication method and temporarily stores 8-bit gradation voltage selection data in a RAM disposed therein, and thereafter sets 8-bit gradation voltage selection data in the register unit.