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US 7,030,842 B2Granted
Electro-luminescence display device and driving method thereof
AssigneeLG.Philips LCD Co., Ltd.
InventorsYong Min Ha, Hoon Ju Chung, Han Sang Lee, Myung Ho Lee, Seok Hee Jeong
Life of this patent
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Abstract
An electro-luminescence display device includes a supply voltage source; a data driver for driving a plurality of data lines arranged within a panel; a gamma voltage generator for generating gamma voltages to generate analog data voltages corresponding to externally inputted data signals provided to the data driver; and a threshold voltage compensator installed between the gamma voltage generator and the supply voltage source for controlling a supply voltage of the supply voltage source and to apply the controlled voltage to the gamma voltage generator.
Claims28
An electro-luminescence display device, comprising:
- a panel;
- a plurality of data lines arranged within the panel;
- a supply voltage source for applying a supply voltage to the panel;
- a data driver for receiving externally inputted digital data signals and for applying analog data signals to the plurality of data lines in correspondence with the externally inputted digital data signals;
- a gamma voltage generator for generating a plurality of gamma voltages having a plurality of voltage levels, wherein the gamma voltages are usable in forming the analog data signals;
- and
- a threshold voltage compensator arranged between the gamma voltage generator and the supply voltage source for controlling the supply voltage to compensate for a threshold voltage of drive thin film transistors and for applying the controlled supply voltage to the gamma voltage generator.
4 more elements
An electro-luminescence display device, comprising:
- a plurality of panels wherein each of the panels include a plurality of electro-luminescence cells arranged in a matrix pattern;
- and a plurality of drive thin film transistors for applying a current to corresponding ones of the electro-luminescence cells, wherein the current corresponds to the analog data voltage;
- a plurality of drive thin film transistors for applying a current to corresponding ones of the electro-luminescence cells, wherein the current corresponds to the analog data voltage;
- data drivers coupled to each of the plurality of panels for receiving externally inputted digital data signals;
- and
- a plurality of red, green, and blue gamma voltage suppliers coupled to each of the data drivers for dividing a supply voltage applied by a supply voltage source into a plurality of gamma voltages, wherein the plurality of gamma voltages are usable in forming analog data voltages corresponding to the received externally inputted digital data signals, wherein each of the gamma voltage suppliers includes:
- a fixed resistor and a variable resistor connected in series to the supply voltage source and to a ground voltage source for dividing the supply voltage;
- and
- a plurality of resistor pairs connected in parallel for generating the gamma voltages using the divided supply voltage;
- wherein a resistance of the variable resistor is adjustable to compensate for threshold voltages of drive thin film transistors in different ones of the plurality of panels, wherein threshold voltages of drive thin film transistors of different panels are different.
7 more elements
A method of driving an electro-luminescence display device, comprising:
- providing a plurality of panels, wherein each panel includes a plurality of thin film transistors;
- providing a power voltage control circuit to each of the plurality of panels;
- providing a common power voltage to each of the power voltage control circuits;
- controlling a common power voltage appliable by each of the power voltage control circuits in accordance with a threshold voltage of the thin film transistors in each of the panels;
- and
- generating a gamma voltage within each of the panels using corresponding ones of the controlled common power voltages.
3 more elements
A method of driving an electro-luminescence display device, comprising:
- providing a plurality of panels;
- providing a plurality of thin film transistors within each of the plurality of panels, wherein each plurality of thin film transistors includes a threshold voltage;
- providing a gamma voltage generator to each of the plurality of panels for generating a plurality of gamma voltages;
- applying a common power voltage to each of the gamma voltage generators;
- and
- generating the plurality of gamma voltages in accordance with the threshold voltage of each plurality of thin film transistors.
3 more elements
An electro-luminescence display device, comprising:
- a plurality of panels;
- a data driver provided to each of the plurality of panels for receiving externally inputted data signals;
- and
- a plurality of gamma voltage generators, each associated with one of the plurality of panels, provided to each data driver for applying a plurality of gamma voltages to corresponding ones of the data drivers, wherein the gamma voltages are usable in forming analog data signals corresponding to the externally inputted data signals and wherein different gamma voltages are appliable by different gamma voltage generators such that pictures are displayable at a substantially uniform brightness by the plurality of panels.
1 more element
Dependencies are inferred from the claim text.