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Patexia Research
Patent No. US 10303304
Issue Date May 28, 2019
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Patent 10303304 - Display device > Claims

  • 1. A display device comprising: a display panel having a plurality of pixels arranged in a matrix, and common electrodes divided into M blocks when M is an integral number of 2 or more (M≥2);a driver circuit applying a touch panel scanning voltage to the common electrodes; anda detector circuit including an integrating circuit, an AD converter, and an averaging filter,wherein the common electrodes of each of the M divided blocks are shared with the respective pixels,wherein the driver circuit sequentially applies the touch panel scanning voltage to the common electrodes of each of the M divided blocks,wherein the integrating circuit outputs an analog touch signal of the display panel, andwherein the AD converter converts an output voltage of the integrating circuit into digital data,wherein the detector circuit determines:in a normal touch detection process, a touch event applying the touch panel scanning voltage to the common electrodes of each of the M divided blocks;in a ghost touch detection process, a ghost touch event without applying the touch panel scanning voltage to the M divided blocks,wherein a threshold value for determining the touch event of the normal touch detection process is different from that for determining the ghost touch event of the ghost touch detection process,wherein the detector circuit determines the touch event with a first operating point of the AD converter and the ghost touch event with a second operating point of the AD converter, andwherein the averaging filter averages a digital data obtained by converting the AD converter in the ghost touch detection process.
    • 2. The display device according to claim 1, wherein the first operating point that is a value closer to the least significant bit than an intermediate value between the least significant bit and the most significant bit in the digital data converted by the AD converter, and the second operating point that is the most significant bit in the digital data converted by the AD converter.
      • 3. The display device according to claim 2, the touch event is determined when the digital data obtained by converting the output voltage of the integrating circuit by the AD converter is a value between a first operating point and the most significant bit, and when a difference between the value of the digital data and the first operating point is larger than a first threshold value.
      • 4. The display device according to claim 2, the ghost touch event is determined when the digital data obtained by converting the output voltage of the integrating circuit by the AD converter is a value between a second operating point and the least significant bit, and when a difference between the value of the digital data and the second operating point is larger than a second threshold value.
      • 5. The display device according to claim 2, wherein the digital data to be converted by the AD converter is data of 10 bits,wherein the first operating point is a value of 250 to 350 decimally, andwherein the second operating point is a value close to 1023 decimally.
    • 8. The display device according to claim 1, the touch event is determined when the digital data obtained by converting an output voltage of the integrating circuit by the AD converter is a value between the first operating point and the most significant bit, and when a difference between the value of the digital data and the first operating point is larger than a first threshold value.
  • 6. A display device comprising: a display panel having a plurality of pixels arranged in a matrix, and common electrodes divided into M blocks when M is an integral number of 2 or more (M≥2);a driver circuit applying a touch panel scanning voltage to the common electrodes; anda detector circuit including an integrating circuit, an AD converter, and an averaging filter,wherein the common electrodes of each of the M divided blocks are shared with the respective pixels,wherein the driver circuit sequentially applies the touch panel scanning voltage to the common electrodes of each of the M divided blocks,wherein the integrating circuit includes a reference voltage input terminal and outputs an analog touch signal of the display panel, andwherein the AD converter converts an output voltage of the integrating circuit into digital data,wherein the detector circuit determines:in a normal touch detection process, a touch event applying the touch panel scanning voltage to the common electrodes of each of the M divided blocks;in a ghost touch detection process, a ghost touch event without applying the touch panel scanning voltage to the M divided blocks,wherein a threshold value for determining the touch event of the normal touch detection process is different from that for determining the ghost touch event of the ghost touch detection process,wherein the detector circuit determines the touch event with a first operating point of the AD converter and the ghost touch event with a second operating point of the AD converter,wherein the first operating point is digital data which is converted the reference voltage.
    • 7. The display device according to claim 6, wherein the first operating point that is a value closer to the least significant bit than an intermediate value between the least significant bit and the most significant bit in the digital data converted by the AD converter, and the second operating point that is the most significant bit in the digital data converted by the AD converter.
      • 9. The display device according to claim 7, the ghost touch event is determined when the digital data obtained by converting the integrating circuit by the AD converter is a value between a second operating point and the least significant bit, and when a difference between the value of the digital data and the second operating point is larger than a second threshold value.
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