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US 12,632,141 B2Granted
Touch display device, driving signal output circuit, and driving signal output method of touch display device
AssigneeLx Semicon Co., Ltd.
InventorsKyung Hwan Kim, Duck Hwan Lee
Life of this patent
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Abstract
The present disclosure relates to a touch display device, a driving signal output circuit, and a driving signal output method of the touch display device. The present disclosure provides a touch display device, a driving signal output circuit, and a driving signal output method of the touch display device, for selectively outputting to a panel a display driving signal and a touch driving signal, which have different voltage levels.
Claims19
A driving signal output circuit, comprising:
- a display driving signal output circuit configured to operate in a first voltage range, receive a display driving signal having the first voltage range through a first terminal, and output a first signal based on the received display driving signal to a panel in a first time period;
- a touch driving signal output circuit configured to operate in a second voltage range, receive a touch driving signal having the second voltage range through a second terminal, and output a second signal based on the received touch driving signal in a second time period different from the first time period;
- and
- a level shifter, wherein the level shifter is configured to:
- receive a logical signal with a predefined voltage, converts the logical signal into a voltage including the first voltage range, and output the converted logical signal including the first voltage range to the display driving signal output circuit to selectively output the display driving signal based on the voltage including the first voltage range to a panel;
- and
- receive the logical signal, convert the logical signal into a voltage including the second voltage range, and output the converted logical signal including the second voltage range to the touch driving signal output circuit to selectively output the touch driving signal based on the voltage including the second voltage range to the panel,
- wherein the converted logical signal in the first voltage range and the converted logical signal in the second voltage range are separately and respectively processed in the display driving signal output circuit and the touch driving signal output circuit in mutually independent signal paths that are not commonly used for both the first voltage range and the second voltage range.
5 more elements
A touch display device comprising:
- a touch control circuit configured to generate a touch synchronization signal;
- a power management circuit configured to receive the touch synchronization signal from the touch control circuit and output a display driving signal having a first voltage range based on the received touch synchronization signal;
- a touch modulation circuit configured to receive the touch synchronization signal from the touch control circuit and output a touch driving signal having a second voltage range based on the received touch synchronization signal;
- and
- a driving signal output circuit configured to receive the display driving signal having the first voltage range from the power management circuit, receive the touch driving signal having the second voltage range from the touch modulation circuit, output a first signal based on the received display driving signal in a first time period, and output a second signal based on the received touch driving signal in a second time period different from the first time period,
- wherein the driving signal output circuit includes a level shifter,
- wherein the level shifter is configured to:
- receive a logical signal with a predefined voltage, converts the logical signal into a voltage including the first voltage range, and output the converted logical signal including the first voltage range to the driving signal output circuit to selectively output the display driving signal based on the voltage including the first voltage range to a panel;
- and
- receive the logical signal, convert the logical signal into a voltage including the second voltage range, and output the converted logical signal including the second voltage range to the driving signal output circuit to selectively output the touch driving signal based on the voltage including the second voltage range to the panel,
- wherein the converted logical signal in the first voltage range and the converted logical signal in the second voltage range are separately and respectively processed in the driving signal output circuit in respective mutually independent signal paths that are not commonly used for both the first voltage range and the second voltage range.
8 more elements
A driving signal output method of a touch display device, the method comprising:
- receiving a display driving signal having a first voltage range from a power management circuit;
- receiving a touch driving signal having a second voltage range from a touch modulation circuit;
- outputting a first signal based on the received display driving signal to a panel in a first time period;
- outputting a second signal based on the received touch driving signal to the panel in a second time period different from the first time period;
- and
- performing a discharge in order to prevent a voltage exceeding a breakdown voltage from being applied in at least some time periods in which the first signal or the second signal is not output,
- wherein the outputting a first signal based on the received display driving signal to a panel in the first time period comprises receiving a logical signal with a predefined voltage, converting the logical signal into a voltage including the first voltage range, and outputting the converted logical signal including the first voltage range to a multiplexer to selectively output the display driving signal based on the voltage including the first voltage range to a panel;
- and
- outputting a second signal based on the received touch driving signal to the panel in a second time period different from the first time period comprises receiving the logical signal, converting the logical signal into a voltage including the second voltage range, and outputting the converted logical signal including the second voltage range to the multiplexer to selectively output the touch driving signal based on the voltage including the second voltage range to the panel,
- wherein the converted logical signal in the first voltage range and the converted logical signal in the second voltage range are separately and respectively processed in the multiplexer in respective mutually independent signal paths that are not commonly used for both the first voltage range and the second voltage range.
7 more elements
Dependencies are inferred from the claim text.