Driver IC and display device
First Claim
1. A driver IC which controls an activation of a display panel and a detection timing of a touch panel comprising:
- a drive circuit operable to activate the display panel in a display drive period;
a control circuit operable to create the detection timing of the touch panel in a non-display drive period during which the action of the drive circuit remains stopped, and to create the display drive period and the non-display drive period; and
a data Random Access Memory (a data RAM) operable to hold display data of more than one display line, but smaller than one display frame in capacity,wherein the control circuit performs the control for alternately creating the display drive period and the non-display drive period by repeating a memory-addressing operation for writing display data supplied from outside into the data RAM and reading the display data from the data RAM at a speed faster than the writing speed to provide the read data to the drive circuit two or more times in a period of one display frame according to a wraparound method,wherein the control circuit has a register circuit for rewritably holding touch interval period data for controlling an addressing range of the memory-addressing operation to be repeated according to the wraparound method within a range of a number of display lines comparable to up to a maximum memory capacity of the data RAM, andwherein the touch interval period data is control data which controls a number of the display lines grouped that is counted so as to make an adjustable space between non-display drive periods based on the number of display lines grouped.
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Accused Products
Abstract
The driver IC includes: a control circuit operable to perform control for creating the timing of detection by a touch panel in a non-display drive period during which the action of a drive circuit remains stopped, and for creating a display drive period during which the drive circuit drives the display panel, and the non-display drive period; and a data RAM operable to hold display data of more than one display line, but smaller than one display frame in capacity. The control circuit performs control for alternately creating the display and non-display drive periods by repeating a memory-addressing operation for writing display data supplied from outside into the RAM and reading the display data from the RAM at a speed faster than the writing speed to provide the read data to the drive circuit two or more times in a period of one display frame according to a wraparound method.
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Citations
17 Claims
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1. A driver IC which controls an activation of a display panel and a detection timing of a touch panel comprising:
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a drive circuit operable to activate the display panel in a display drive period; a control circuit operable to create the detection timing of the touch panel in a non-display drive period during which the action of the drive circuit remains stopped, and to create the display drive period and the non-display drive period; and a data Random Access Memory (a data RAM) operable to hold display data of more than one display line, but smaller than one display frame in capacity, wherein the control circuit performs the control for alternately creating the display drive period and the non-display drive period by repeating a memory-addressing operation for writing display data supplied from outside into the data RAM and reading the display data from the data RAM at a speed faster than the writing speed to provide the read data to the drive circuit two or more times in a period of one display frame according to a wraparound method, wherein the control circuit has a register circuit for rewritably holding touch interval period data for controlling an addressing range of the memory-addressing operation to be repeated according to the wraparound method within a range of a number of display lines comparable to up to a maximum memory capacity of the data RAM, and wherein the touch interval period data is control data which controls a number of the display lines grouped that is counted so as to make an adjustable space between non-display drive periods based on the number of display lines grouped. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A display device comprising:
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a panel module having a display panel and a touch panel incorporated in the display panel; and a driver IC provided in the panel module and operable to perform an activation control of the display panel and a detection control of the touch panel, wherein the driver IC has a drive circuit operable to drive the display panel in a display drive period, a touch panel controller operable to perform the detection control of the touch panel in a non-display drive period during which the action of the drive circuit remains stopped, a data Random Access Memory (a data RAM) operable to hold display data of more than one display line, but smaller than one display frame in capacity, and a control circuit operable to perform the control for alternately creating the display drive period and the non-display drive period by repeating a memory-addressing operation for writing display data supplied from outside into the data RAM and reading the display data from the data RAM at a speed faster than the writing speed to provide the read data to the drive circuit two or more times in a period of one display frame according to a wraparound method, and further arranged so that the display drive period and the non-display drive period are specified within a line number range of numbers of display lines corresponding to no more than a maximum memory capacity of the data RAM, wherein the control circuit has a register circuit for rewritably holding touch interval period data for controlling an addressing range of the memory-addressing operation to be repeated according to the wraparound method within a range of a number of display lines comparable to up to a maximum memory capacity of the data RAM, and wherein the touch interval period data is control data which controls a number of the display lines grouped that is counted so as to make an adjustable space between non-display drive periods based on the number of display lines grouped. - View Dependent Claims (16, 17)
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Specification