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US 10,255,871 B2Granted
Display device including a MUX to vary voltage levels of a switching circuit used to drive a display panel
AssigneeLG Display Co., Ltd.
InventorZonggun Oh
Life of this patent
Estimating the term…
Abstract
A display device includes a display panel including a plurality of data lines, a data driver to supply a source voltage to each data line through a source line, a switching circuit to connect each data line to the source line, and a multiplexer controller to produce a control signal operating the switching circuit and vary a voltage level of the control signal depending on the source voltage.
Claims12
A display device, comprising:
- a display panel including a plurality of data lines;
- a gate driver to supply, to the display panel, a gate pulse having a first gate voltage and a second gate voltage lower than the first gate voltage;
- a data driver to supply a source voltage to each data line through a source line, wherein the data driver includes a digital-to-analog converter (DAC) that converts input digital video data to the source voltage;
- a switching circuit between the DAC and each data line to be operated by a control signal to connect each data line to the source line;
- and
- a multiplexer controller comprising a data reading unit to read image data on a per line basis, detect reference data which is a maximum value representing a gray level among the image data, a lookup table to store the reference data and a voltage level of the control signal in an associated manner, and a control signal output unit to select the voltage level of the control signal corresponding to the reference data from the lookup table and produce the control signal with the selected voltage that controls an operation timing of the switching circuit to connect each data line to the source line,
- wherein when the source voltage is a positive voltage, the multiplexer controller sets the voltage level of the control signal so that a turn-on level of the control signal is proportional to a value of the source voltage and lower than the first gate voltage and a turn-off level of the control signal is a negative voltage having an absolute value less than an absolute value of the second gate voltage.
4 more elements
A method of driving a display device including a display panel with a plurality of data lines and a plurality of gate lines, the method comprising;
- reading image data on a per line basis and detecting reference data which is a maximum value representing a gray level among the image data, by a multiplexer controller;
- converting the image data to a source voltage by a digital-to-analog converter (DAC) in a data driver;
- supplying the source voltage corresponding the image data to each data line through a source line, by the data driver;
- producing a control signal, a voltage level of which is determined based on the reference data, by the multiplexer controller;
- and
- controlling an operating time of a switching circuit by the control signal to connect the data line to the source line,
- wherein when the source voltage is a positive voltage, the voltage level of the control signal is set by the multiplexer controller so that a turn-on level of the control signal is proportional to a value of the source voltage and lower than a first gate voltage and a turn-off level of the control signal is a negative voltage having an absolute value less than an absolute value of a second gate voltage, the first gate voltage and the second gate voltage respectively being a gate high voltage and a gate low voltage of a gate pulse supplied to the plurality of gate lines, the gate low voltage being lower than the gate high voltage.
4 more elements
Dependencies are inferred from the claim text.