Display device
AssigneeSamsung Display Co., Ltd.
InventorsDongin Kim, Jinkyu Park, Joon-chul Goh
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Abstract
A display device includes a memory, a signal controller, and a voltage generator. A plurality of data is stored in the memory. The signal controller detects a frame rate of an externally applied image data signal, selects data corresponding to the detected frame rate among the plurality of data, and outputs a control signal corresponding to the selected data. The voltage generator includes a DC-DC converter for determining an output voltage in correspondence to the control signal and a feedback circuit for determining a current flowing inside and a frequency of an outputted signal in correspondence to the control signal.
Claims17
A display device comprising:
- a memory configured to store a plurality of data;
- a signal controller comprising a receiver to receive image data, a first register to read the plurality of data stored in the memory, and a power controller, wherein the power controller comprises a frequency detector to detect a frequency of the received image data and an operation controller to output a control signal based on data corresponding to the detected frequency among the plurality of data read by the first register;
- and
- a voltage generator comprising a plurality of output circuits to output a plurality of voltages in correspondence to the control signal,
- wherein at least one of the plurality of output circuits comprises:
- a DC-DC converter configured to output an output voltage;
- and
- a feedback circuit configured to control an output of the DC-DC converter and comprising a first comparator to compare the output voltage with a first reference voltage, a second comparator to compare an output of the first comparator with a second reference voltage, and a PWM controller to output a pulse signal based on an output of the second comparator and the control signal,
- wherein the output voltage of the DC-DC converter is changed in correspondence to the control signal, and
- wherein as the detected frequency is higher, a frequency of the pulse signal outputted from the PWM controller becomes higher.
A display device comprising:
- a memory configured to store a plurality of data;
- a signal controller configured to detect a frame rate of an externally applied image data signal, select data corresponding to the detected frame rate among the plurality of data, and output a control signal corresponding to the selected data;
- and
- a voltage generator comprising a DC-DC converter to determine an output voltage in correspondence to the control signal, and a feedback circuit to determine a current flowing in the voltage generator and a frequency of an outputted signal in correspondence to the control signal,
- wherein the feedback circuit comprises a first comparator, a second comparator to receive an output of the first comparator, and a current controller to control a current value of the output of the first comparator, and
- wherein the current controller comprises a variable resistor and a capacitor, and a resistance value of the variable resistor is determined in correspondence to the detected frame rate.
A display device comprising:
- a memory configured to store a plurality of data;
- a signal controller configured to detect a frame rate of an externally applied image data signal, select data corresponding to the detected frame rate among the plurality of data, and output a control signal corresponding to the selected data;
- and
- a voltage generator comprising a DC-DC converter to determine an output voltage in correspondence to the control signal, and a feedback circuit to determine a current flowing in the voltage generator and a frequency of an outputted signal in correspondence to the control signal,
- wherein signals outputted by the feedback circuit comprise a plurality of pulse waves, and a part of the plurality of pulse waves is skipped in correspondence to the detected frame rate, and
- wherein as the detected frame rate is smaller, a number of pulse waves skipped among the plurality of pulse waves increases.
Dependencies are inferred from the claim text.