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US 7,548,227 B2Granted
Display apparatus, device for driving the display apparatus, and method of driving the display apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorSung-Ho Lee
Life of this patent
Estimating the term…
Abstract
A device for driving a display apparatus includes a scan driver, a timing circuit and a data driver. The scan driver generates a plurality of scan signals activating the scan lines. The timing circuit generates a control signal. The data driver samples a first gray scale voltage signal in response to the control signal, and generates a second gray scale voltage signal to provide a display panel of the display apparatus with the second gray scale voltage signal. The second gray scale voltage signal has a sampled voltage level of the first gray scale voltage signal, and the sampled voltage level is synchronized with the control signal. The deterioration of the display quality due to ripples may be reduced.
Claims11
A device for driving a display apparatus, the device comprising:
- a timing circuit including an oscillator which generates a first oscillating signal and an operation circuit which generates a control signal and including a counter that is configured to count a number of pulses of the first oscillating signal to generate a square wave signal;
- a data driver that is configured to sample a first gray scale voltage signal in response to the control signal, and configured to generate a second gray scale voltage signal to provide to a display panel of the display apparatus, the second gray scale voltage signal having a voltage level substantially equal to a sampled voltage level of the first gray scale voltage signal, the sampled voltage level of the first gray scale voltage signal being synchronized with the control signal;
- wherein the timing circuit further includes a booster that is configured to boost the first oscillating signal to generate a second oscillating signal, and the operation circuit generates the control signal based on the first and second oscillating signals;
- and
- the operation circuit further includes an AND gate that is configured to perform a logical AND operation on the second oscillating signal and the square wave signal to generate the control signal, and the square wave signal is activated in response to every given number of the pulses of the first oscillating signal.
2 more elements
A device for driving a display apparatus having a display panel, the display panel having a plurality of scan lines, a plurality of data lines and a plurality of pixels, the device comprising:
- a scan driver that is configured to generate a plurality of scan signals activating the scan lines;
- a timing circuit including an oscillator which generates a first oscillating signal and an operation circuit which generates a control signal and including a counter that is configured to count a number of pulses of the first oscillating signal to generate a square wave signal;
- a data driver that is configured to sample a first gray scale voltage signal in response to the control signal, and configured to generate a second gray scale voltage signal to provide to a display panel of the display apparatus, the second gray scale voltage signal having a voltage level substantially equal to a sampled voltage level of the first gray scale voltage signal, the sampled voltage level of the first gray scale voltage signal being synchronized with the control signal;
- wherein the timing circuit further includes a booster that is configured to boost the first oscillating signal to generate a second oscillating signal, and the operation circuit generates the control signal based on the first and second oscillating signals;
- and
- wherein the operation circuit further includes an AND gate that is configured to perform a logical AND operation on the second oscillating signal and the square wave signal to generate the control signal, and the square wave signal is activated in response to every given number of the pulses of the first oscillating signal.
3 more elements
A display apparatus comprising:
- a display panel having a plurality of scan lines, a plurality of data lines and a plurality of pixels;
- a scan driver that is configured to generate a plurality of scan signals activating the scan lines;
- a timing circuit including an oscillator which generates a first oscillating signal and an operation circuit which generates a control signal and including a counter that is configured to count a number of pulses of the first oscillating signal to generate a square wave signal;
- a data driver that is configured to sample a first gray scale voltage signal in response to the control signal, and configured to generate a second gray scale voltage signal to provide to a display panel of the display apparatus, the second gray scale voltage signal having a voltage level substantially equal to a sampled voltage level of the first gray scale voltage signal, the sampled voltage level of the first gray scale voltage signal being synchronized with the control signal;
- wherein the timing circuit further includes a booster that is configured to boost the first oscillating signal to generate a second oscillating signal, and the operation circuit generates the control signal based on the first and second oscillating signals;
- and
- wherein the operation circuit further includes an AND gate that is configured to perform a logical AND operation on the second oscillating signal and the square wave signal to generate the control signal, and the square wave signal is activated in response to every given number of the pulses of the first oscillating signal.
4 more elements
A method of driving a display apparatus, the method comprising:
- generating a first oscillating signal;
- counting a number of pulses of the first oscillating signal to generate a square wave signal;
- generating a control signal;
- generating a second gray scale voltage signal by sampling a first gray scale voltage signal in response to the control signal to provide to the display apparatus, the second gray scale voltage signal having a voltage level substantially equal to a sampled voltage level of the first gray scale voltage signal, the sampled voltage level of the first gray scale voltage signal being synchronized with the control signal;
- wherein said generating the control signal further includes:
- boosting the first oscillating signal to generate a second oscillating signal;
- and generating the control signal based on the first and second oscillating signals;
- and
- an AND gate that is configured to perform a logical AND operation on the second oscillating signal and the square wave signal to generate the control signal, and the square wave signal is activated in response to every given number of the pulses of the first oscillating signal.
6 more elements
Dependencies are inferred from the claim text.