Liquid crystal display having gray voltages with varying magnitudes and driving method thereof
First Claim
1. A liquid crystal display comprising:
- a reference voltage generator changing a level of a first predetermined voltage based on a first signal to generate a reference voltage, the first signal varying depending on one of brightness of surroundings of the liquid crystal display, brightness of on-screen images of the liquid crystal display, and a user'"'"'s manipulation;
a gray voltage generator generating a plurality of gray voltages with magnitudes depending on a magnitude of the reference voltage;
a gate driver supplying gate signals to a plurality of gate signal lines;
a data driver selecting the gray voltages based on gray data from an external source to supply to a plurality of data signal lines; and
a signal generator determining the brightness of the on-screen images from the gray data and generating the first signal depending on the brightness or the user'"'"'s manipulation,wherein the signal generator comprises;
a square wave generator calculating representative value of gray data from an external source and generating a wave signal depending on the representative value of the gray data; and
an analog converter analogue-converting the wave signal from the square wave generator into the first signal and outputting the first signal to the reference voltage generator.
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Accused Products
Abstract
A liquid crystal display (“LCD”) having a plurality of gray voltages with varying magnitudes and a driving method thereof. An LCD includes a reference voltage generator changing level of a supply voltage based on a first signal to generate a reference voltage. The first signal varies depending on the surrounding brightness of the LCD, the brightness of the on-screen images of the LCD, and user'"'"'s manipulation. The LCD also includes a gray voltage generator generating a plurality of gray voltages with magnitudes varying dependent on the magnitude of the reference voltage and a predetermined voltage such as a ground voltage. The LCD further includes a plurality of gate lines transmitting a plurality of gate signals, a plurality of data lines transmitting the gray voltages, and a plurality of pixels. Each pixel has a switching element connected to one of the gate lines and one of the data lines and transmitting the gray voltages to the pixels under the control of the gate signal. The LCD includes a gate driver supplying the gate signals to the gate lines and a data driver selecting the gray voltages based on gray data from an external source to supply to the pixels via the data lines.
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Citations
13 Claims
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1. A liquid crystal display comprising:
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a reference voltage generator changing a level of a first predetermined voltage based on a first signal to generate a reference voltage, the first signal varying depending on one of brightness of surroundings of the liquid crystal display, brightness of on-screen images of the liquid crystal display, and a user'"'"'s manipulation; a gray voltage generator generating a plurality of gray voltages with magnitudes depending on a magnitude of the reference voltage; a gate driver supplying gate signals to a plurality of gate signal lines; a data driver selecting the gray voltages based on gray data from an external source to supply to a plurality of data signal lines; and a signal generator determining the brightness of the on-screen images from the gray data and generating the first signal depending on the brightness or the user'"'"'s manipulation, wherein the signal generator comprises; a square wave generator calculating representative value of gray data from an external source and generating a wave signal depending on the representative value of the gray data; and an analog converter analogue-converting the wave signal from the square wave generator into the first signal and outputting the first signal to the reference voltage generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of driving a liquid crystal display having a plurality of gate lines, a plurality of data lines which are insulated from the plurality of gate lines and cross with the plurality of gate lines, and a plurality of pixels aligned in a matrix shape, located in a region restricted by the plurality of gate lines and the and plurality of data lines and including switching elements connected to the gate lines and the data lines, the method comprising:
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receiving a first predetermined voltage from an external source; receiving a gray data from the external source; sensing a brightness level of surroundings of the liquid crystal display, or determining a brightness level of on-screen images of the liquid crystal display based on gray data from the external source or sensing a user'"'"'s manipulation, and then outputting a first signal representing a sensed value; changing a level of the first predetermined voltage to generate a second signal on the basis of the first signal; generating a plurality of gray voltages with magnitudes varying dependent on the second signal; converting the gray data into corresponding gray voltages based on the plurality of gray voltages and then providing the corresponding gray voltages to the data lines, and providing scan signals to the gate lines sequentially, wherein sensing a brightness level of surroundings of the liquid crystal display, or determining a brightness level of on-screen images of the liquid crystal display or sensing a user'"'"'s manipulation comprises; calculating a representative value of the gray data and generating a wave signal depending on the representative value of the gray data; and analogue-converting the wave signal into the first signal, and outputting the converted wave signal. - View Dependent Claims (13)
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Specification