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US 2020/0004367 A1Published application
Touch display device, display controller, driving circuit, and driving method
AssigneeLG Display Co., Ltd.
InventorsSungHoon Lee, SeungMok Shin, HoonBae Kim, SunYeop Kim
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Abstract
A touch display device, a display controller, a driving circuit, and a driving method. Even in the case that a rate (or an input cycle) at which an image supply device supplies image data is not synchronized with a rate (or a beacon cycle) at which a beacon signal for pen sensing is output to the display panel, display processing and touch sensing (e.g., pen sensing or finger sensing) is performed ordinarily by controlling data output processing.
Claims25
A touch display device, comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes;
- a gate driving circuit electrically connected to the display panel, the gate driving circuit configured to sequentially output gate signals to the plurality of gate lines to drive the plurality of gate lines;
- a data driving circuit electrically connected to the display panel, the data driving circuit configured to receive digital output image data, and configured to convert the digital output image data into analog data signals, and configured to output the analog data signals to the plurality of data lines to drive the plurality of data lines;
- a touch driving circuit configured to output a beacon signal, directed to one or more pens in contact with or adjacent to the display panel, to one or more touch electrodes among the plurality of touch electrodes, and the touch driving circuit configured to output a first beacon signal during a first beacon transmission period, a second beacon signal during a second beacon transmission period, and a third beacon signal during a third beacon transmission period, according to a predetermined beacon cycle;
- and
- a display controller configured to store input image data in a memory and configured to output image data, corresponding to the input image data stored in the memory, to the data driving circuit, and wherein the display controller is further configured to:
- receive first input image data, second input image data, and third input image data according to an input cycle corresponding to a different value from the beacon cycle;
- output first output image data, second output image data, and third output image data corresponding to the first input image data, the second input image data, and the third input image data, respectively;
- output the first output image data between the first beacon transmission period and the second beacon transmission period;
- and
- output the second output image data, re-output the first output image data, or hold data output processing between the second beacon transmission period and the third beacon transmission period.
8 more elements
A touch display device, comprising:
- a display panel in which a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes are disposed;
- a gate driving circuit electrically connected to the display panel, the gate driving circuit sequentially outputting gate signals to the plurality of gate lines to drive the plurality of gate lines;
- a data driving circuit electrically connected to the display panel, the data driving circuit receiving output image data, in a form of digital signals, converting the output image data into analog data signals, and outputting the analog data signals to the plurality of data lines to drive the plurality of data lines, and the data driving circuit holding output of the analog data signals or repeatedly outputting the analog data signals having already been output in a previous active period in which images are displayed, during one or more active periods among two or more active periods;
- and
- a touch driving circuit outputting a beacon signal to one or more touch electrodes among the plurality of touch electrodes, the touch driving circuit outputting a beacon signal in every blank period between the active periods in which images are displayed
2 more elements
A display controller of a touch display device including a display panel in which a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes are disposed, and a data driving circuit driving the plurality of data lines, the display controller comprising:
- a data input section receiving first input image data, second input image data, and third input image data according to a predetermined input cycle;
- a memory storing the first input image data, the second input image data, and the third input image data;
- and
- a data output section outputting first output image data, second output image data, and third output image data corresponding to the first input image data, the second input image data, and the third input image data to the data driving circuit,
- wherein the predetermined input cycle is defined as a value different from a beacon cycle in which a beacon signal is output to one or more touch electrodes among the plurality of touch electrodes disposed in the display panel,
- wherein the beacon signal is a signal directed to one or more pens in contact with or adjacent to the display panel,
- wherein the data output section outputs the first output image data between a first beacon transmission period in which a first beacon signal is output to the display panel and a second beacon transmission period in which a second beacon signal is output to the display panel, and
- wherein the data output section holds data output processing or re-outputs the first output image data between the second beacon transmission period in which the second beacon signal is output to the display panel and a third beacon transmission period in which a third beacon signal is output to the display panel.
5 more elements
A driving circuit, comprising:
- a data driving circuit receiving output image data, in a form of digital signals, converting the output image data into analog data signals, and outputting the analog data signals to the plurality of data lines to drive a plurality of data lines disposed in a display panel;
- and
- a touch driving circuit outputting a beacon signal, which is directed to one or more pens in contact with or adjacent to the display panel, to one or more touch electrodes among a plurality of touch electrodes disposed in the display panel,
- wherein the touch driving circuit outputs a first beacon signal during a first beacon transmission period, a second beacon signal during a second beacon transmission period, and a third beacon signal during a third beacon transmission period, according to a predetermined beacon cycle, and
- wherein the data driving circuit outputs first data signals between the first beacon transmission period and the second beacon transmission period, and outputs second data signals following the first data signals, re-outputs the first data signals, or holds data output processing between the second beacon transmission period and the third beacon transmission period.
2 more elements
A method of driving a touch display device including a display panel in which a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes are disposed, the method comprising:
- outputting a first beacon signal, directed to one or more pens in contact with or adjacent to the display panel, to one or more touch electrodes among the plurality of touch electrodes;
- outputting first data signals to the plurality of data lines after the first beacon signal is output;
- outputting a second beacon signal to the one or more touch electrodes among the plurality of touch electrodes after the first beacon signal is output;
- and
- after the second beacon signal is output, outputting second data signals to the plurality of data lines, re-outputting the first data signals to the plurality of data lines, or holding data output processing.
2 more elements
Dependencies are inferred from the claim text.