Back to results
US 2011/0032279 A1Published application
Display driver circuit and display device
AssigneeSamsung Electronics Co., Ltd.
InventorsIn-Suk KIM, Jae-Goo LEE
Life of this patent
Estimating the term…
Abstract
A display driver circuit and a display device are provided. The display driver circuit may have positive and negative resistor strings that are symmetrically formed and include a plurality of resistors, and applies a gamma voltage to one of the positive and negative resistor strings in response to a polarity selection signal, thereby generating and outputting a positive grayscale voltage and a negative grayscale voltage.
Claims20
A display driver circuit, comprising:
- a reference voltage selection unit configured to receive and divide a first supply voltage and a second supply voltage, and select and output a maximum reference voltage and a minimum reference voltage;
- and
- a grayscale voltage generator including a gamma voltage selector configured to receive the maximum and minimum reference voltages, generate at least two gamma voltages by dividing the maximum and minimum reference voltages, and generate, using the at least two gamma voltages, at least two positive grayscale voltages that range from the minimum reference voltage to the maximum reference voltage or at least two negative grayscale voltages that range from the maximum reference voltage to the minimum reference voltage,
- wherein an absolute value of a difference between a first positive grayscale voltage and a second positive grayscale voltage of the at least two positive grayscale voltages equals an absolute value of a difference between a first negative grayscale voltage and a second negative grayscale voltage of the at least two negative grayscale voltages.
1 more element
A display device comprising:
- a panel including an array substrate including a plurality of pixel electrodes between a plurality of data lines and a plurality of gate lines, a counter substrate disposed to face the array substrate and including at least one common electrode, and a liquid crystal layer interposed between the array substrate and the counter substrate;
- a controller configured to output a source driver control signal, a gate driver control signal, and a polarity signal in response to image data and a command;
- a grayscale voltage generator configured to output a selection grayscale voltage in response to the polarity signal;
- a source driver configured to receive the selection grayscale voltage in response to the source driver control signal and apply a display data voltage to the plurality of data lines;
- and
- a gate driver configured to apply a gate-on voltage to the plurality of gate lines in response to the gate driver control signal,
- wherein the grayscale voltage generator includes:
- a reference voltage selection unit configured to receive and divide a first supply voltage and a second supply voltage, and select and output a maximum reference voltage and a minimum reference voltage;
- and
- a gamma voltage selector configured to receive the maximum and minimum reference voltages, generate at least two gamma voltages by dividing the maximum and minimum reference voltages, and generate at least two positive grayscale voltages that range from the minimum reference voltage to the maximum reference voltage or at least two negative grayscale voltages that range from the maximum reference voltage to the minimum reference voltage using the at least two gamma voltages,
- wherein an absolute value of a difference between a first positive grayscale voltage and a second positive grayscale voltage of the at least two positive grayscale voltages equals an absolute value of a difference between a first negative grayscale voltage and a second negative grayscale voltage of the at least two negative grayscale voltages.
8 more elements
Dependencies are inferred from the claim text.