Liquid crystal display device and driver circuit thereof
AssigneeSony Corporation
InventorToshikazu Maekawa
Life of this patent
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Abstract
A data latch circuit of a liquid crystal display device digital input data is converted into data of a power supply voltage level by comparing it with a comparison reference voltage in a comparator section having a PMOS differential amplifier circuit in a sampling period of a sampling pulse signal. The converted data is latched by a first data latch section in a non-sampling period of the sampling pulse signal. The latched data is held for a 1H period by a second data latch section.
Claims9
A liquid crystal display device having a data latch circuit for latching digital input data in response to a sampling pulse signal that is generated based on horizontal scanning, the latch circuit comprising:
- a comparator section having a PMOS differential circuit that receives the digital input data as an input for comparison and a predetermined comparison reference voltage as an input for reference, for performing a comparison operation in a sampling period of the sampling pulse signal;
- a first data latch section for latching an output of the comparator section in a non-sampling period of the sampling pulse signal;
- and
- a second data latch section for latching output data of the first data latch section in response to an output enable pulse occurring in one horizontal period;
- wherein the first data latch section comprises a first inverter having an input end that is connected to an output end of the comparator section, a second inverter having an input end that is connected to an output end of the first inverter, and a switching element that is connected between the input end of the first inverter and the output end of the second inverter and turned on in the non-sampling period of the sampling pulse signal.
A liquid crystal display device having a data latch circuit for latching digital input data in response to a sampling pulse signal that is generated based on horizontal scanning, the latch circuit comprising:
- a comparator section having a PMOS differential circuit that receives the digital input data as an input for comparison and a predetermined comparison reference voltage as an input for reference, for performing a comparison operation in a sampling period of the sampling pulse signal;
- a first data latch section for latching an output of the comparator section in a non-sampling period of the sampling pulse signal;
- and
- a second data latch section for latching output data of the first data latch section in response to an output enable pulse occurring in one horizontal period;
- wherein the second data latch section comprises a transfer switch for transferring the output data of the first data latch section in response to the output enable pulse, a first inverter having an input end that is connected to an output end of the transfer switch, and a second inverter having an input end and an output end that are connected to an output end and the input end of the first inverter, respectively.
A liquid crystal display device having a shift register, a decoder circuit, and a data latch circuit for latching digital input data in response to a pulse of a sampling pulse signal that is generated based on horizontal scanning, the data latch circuit comprising:
- a comparator section having a PMOS differential circuit that receives the digital input data as an input for comparison and a predetermined comparison reference voltage as an input for reference, for performing a comparison operation in a sampling period of the sampling pulse signal;
- a first data latch section for latching an output of the comparator section in a non-sampling period of the sampling pulse signal;
- and
- a second data latch section for latching output data of the first data latch section in response to an output enable pulse occurring in one horizontal period;
- wherein the first data latch section comprises a first inverter having an input end that is connected to an output end of the comparator section, a second inverter having an input end that is connected to an output end of the first inverter, and a switching element that is connected between the input end of the first inverter and the output end of the, second inverter and turned on in the non-sampling period of the sampling pulse signal.
A liquid crystal display device having a shift register, a decoder circuit, and a data latch circuit for latching digital input data in response to a pulse of a sampling pulse signal that is generated based on horizontal scanning, the data latch circuit comprising:
- a comparator section having a PMOS differential circuit that receives the digital input data as an input for comparison and a predetermined comparison reference voltage as an input for reference, for performing a comparison operation in a sampling period of the sampling pulse signal;
- a first data latch section for latching an output of the comparator section in a non-sampling period of the sampling pulse signal;
- and
- a second data latch section for latching output data of the first data latch section in response to an output enable pulse occurring in one horizontal period;
- wherein the second data latch section comprises a transfer switch for transferring the output data of the first data latch section in response to the output enable pulse, a first inverter having an input end that is connected to an output end of the transfer switch, and a second inverter having an input end and an output end that are connected to an output end and the input end of the first inverter, respectively.
A driver circuit of a liquid crystal display device having a data latch circuit for latching digital input data in response to a sampling pulse signal that is generated based on horizontal scanning, the data latch circuit comprising:
- a comparator section having a PMOS differential circuit that receives the digital input data as an input for comparison and a predetermined comparison reference voltage as an input for reference, for performing a comparison operation in a sampling period of the sampling pulse signal;
- a first data latch section for latching an output of the comparator section in a non-sampling period of the sampling pulse signal;
- and
- a second data latch section for latching output data of the first data latch section in response to an output enable pulse occurring in one horizontal period;
- wherein the first data latch section comprises a first inverter having an input end that is connected to an output end of the comparator section, a second inverter having an input end that is connected to an output end of the first inverter, and a switching element that is connected between the input end of the first inverter and the output end of the second inverter and turned on in the non-sampling period of the sampling pulse signal.
A driver circuit of a liquid crystal display device having a data latch circuit for latching digital input data in response to a sampling pulse signal that is generated based on horizontal scanning, the data latch circuit comprising:
- a comparator section having a PMOS differential circuit that receives the digital input data as an input for comparison and a predetermined comparison reference voltage as an input for reference, for performing a comparison operation in a sampling period of the sampling pulse signal;
- a first data latch section for latching an output of the comparator section in a non-sampling period of the sampling pulse signal;
- and
- a second data latch section for latching output data of the first data latch section in response to an output enable pulse occurring in one horizontal period;
- wherein the second data latch section comprises a transfer switch for transferring the output data of the first data latch section in response to the output enable pulse, a first inverter having an input end that is connected to an output end of the transfer switch, and a second inverter having an input end and an output end that are connected to an output end and the input end of the first inverter, respectively.
Dependencies are inferred from the claim text.