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US 12,182,349 B2Granted
Touch display device and display panel for improving sensing and image quality
AssigneeLG Display Co., Ltd.
InventorCheolSe Kim
Life of this patent
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Abstract
A touch display device can include a display panel including a plurality of data lines, a plurality of gate lines, a plurality of subpixels, and a plurality of touch electrodes, each of the plurality of subpixels including a light emitting element and a driving transistor; and a signal conversion circuit configured to supply a driving signal to the plurality of subpixels in the display panel or a driving circuit connected to the display panel. Also, the driving signal can have a signal waveform corresponding to a signal waveform of a first power signal or a signal waveform of a second power signal.
Claims18
A touch display device, comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, a plurality of subpixels, and a plurality of touch electrodes, each of the plurality of subpixels including a light emitting element and a driving transistor;
- and
- a signal conversion circuit configured to supply a driving signal to the display panel or a driving circuit connected to the display panel,
- wherein the driving signal has a signal waveform corresponding to a signal waveform of a first power signal or a signal waveform of a second power signal, and the first power signal and the second power signal are applied to the plurality of subpixels,
- wherein the signal conversion circuit is configured to output a reference driving voltage having a constant voltage level, as the driving signal, during a display driving period and a modulation driving signal having a voltage level that varies with respect to the reference driving voltage, as the driving signal, during a touch driving period,
- wherein the signal conversion circuit includes an adder circuit configured to output the driving signal, and
- wherein the adder circuit is configured to:
- receive the first power signal or the second power signal as a first input signal,
- receive the reference driving voltage as a second input signal, and
- output the driving signal as an output signal based on the first input signal added to the reference driving voltage.
7 more elements
A display panel, comprising:
- a plurality of subpixels;
- a plurality of data lines connected to the plurality of subpixels;
- a plurality of scanning gate lines connected to the plurality of subpixels;
- a first power line configured to supply a first power signal to the plurality of subpixels;
- a second power line configured to supply a second power signal to the plurality of subpixels;
- and
- a plurality of touch electrodes,
- wherein while a touch electrode driving signal having a varying voltage level is supplied to at least one of the plurality of touch electrodes,
- voltages of the first power signal and the second power signal vary, and
- a scanning gate signal supplied to at least one of the plurality of scanning gate lines has a same voltage variation pattern as a voltage variation pattern of the first power signal or a voltage variation pattern of the second power signal, or a data signal supplied to at least one of the plurality of data lines has a same voltage variation pattern as a voltage variation pattern of the first power signal or a voltage variation pattern of the second power signal, or the touch electrode driving signal has a same voltage variation pattern as the voltage variation pattern of the first power signal or the voltage variation pattern of the second power signal,
- wherein the signal conversion circuit is configured to output a reference driving voltage having a constant voltage level, as at least one of a driving signal, during a display driving period and a modulation driving signal having a voltage level that varies with respect to the reference driving voltage, as at least one of the scanning gate signal, the data signal and the touch electrode driving signal, during a touch driving period,
- wherein the signal conversion circuit includes an adder circuit configured to output at least one of the scanning gate signal, the data signal and the touch electrode driving signal, and
- wherein the adder circuit is configured to:
- receive the first power signal or the second power signal as a first input signal,
- receive the reference driving voltage as a second input signal, and
- output at least one of the scanning gate signal, the data signal and the touch electrode driving signal as an output signal based on the first input signal added to the reference driving voltage.
13 more elements
A touch display device, comprising:
- a plurality of touch electrodes;
- a plurality of subpixels configured to receive a first power signal and a second power signal;
- and
- a signal conversion circuit configured to:
- receive the first power signal or the second power signal,
- modulate a voltage variation pattern of the first power signal or the second power signal on top of at least one reference driving signal to generate at least one modulated driving signal,
- output the at least one modulated driving signal to at least one subpixel among the plurality of subpixels or at least one touch electrode among the plurality of touch electrodes,
- output a constant driving signal having a constant voltage level to the at least one subpixel or the at least one touch electrode during a display driving period, and
- output a varying driving signal having a varying voltage level to the at least one subpixel or the at least one touch electrode during a touch driving period,
- wherein the signal conversion circuit includes an adder circuit configured to output the at least one modulated driving signal,
- wherein the adder circuit is configured to:
- receive the first power signal or the second power signal as a first input signal,
- receive the constant driving signal as a second input signal, and
- output the varying driving signal as an output signal based on the first input signal added to the constant driving voltage.
11 more elements
Dependencies are inferred from the claim text.