Liquid crystal displays with optical sensors

{
  "publication_number": "US2026105896A1",
  "country": "US",
  "kind": "A1",
  "title": "Liquid crystal displays with optical sensors",
  "abstract": "According to one embodiment, a liquid crystal display device with an optical sensor includes a display panel and a driver IC. The display panel includes first to third signal lines, an optical sensor including a photoelectric conversion element, and a sensor signal line that is connected to the optical sensor and transmits a detection signal to the driver IC. One first wiring line drawn from one terminal of the driver IC is connected to four switching elements. Three of the four switching elements are electrically connected to one of the first to third signal lines, respectively. One of the four switching elements, different from the three switching elements, is electrically connected to the sensor signal line.",
  "claims": [
    "1. A liquid crystal display device with an optical sensor comprising: a display panel comprising a first substrate, a second substrate facing the first substrate, and a liquid crystal layer located between the first substrate and the second substrate; and a driver IC, the display panel comprising: a first signal line supplying video signals to a first sub-pixel corresponding to red, a second signal line supplying video signals to a second sub-pixel corresponding to green, and a third signal line supplying video signals to a third sub-pixel corresponding to blue; an optical sensor comprising a photoelectric conversion element that outputs a detection signal in response to light incident from the liquid crystal layer side; and a sensor signal line connected to the optical sensor and transmitting the detection signal to the driver IC, wherein one first wiring line drawn from one terminal of the driver IC is connected to four switching elements, three of the four switching elements are electrically connected to one of the first signal line, the second signal line, and the third signal line, respectively, and one of the four switching elements, which is different from the three switching elements, is electrically connected to the sensor signal line. 2. The liquid crystal display device with the optical sensor of claim 1, wherein two of the four switching elements electrically connected to the first signal line and the third signal line share one semiconductor layer. 3. The liquid crystal display device with the optical sensor of claim 2, wherein the four switching elements are each provided with an n-type semiconductor and a p-type semiconductor, n-type semiconductors of two of the four switching elements electrically connected to the first signal line and the third signal line share one first semiconductor layer, and p-type semiconductors of two of the four switching elements electrically connected to the first signal line and the third signal line share one second semiconductor layer. 4. The liquid crystal display device with the optical sensor of claim 1, wherein the first wiring: transmits the video signals to the first signal line, the second signal line, and the third signal line in a case where the driver IC is in a display mode for displaying images, and transmits the detection signal to the driver IC in a case where the driver IC is in a detection mode for detecting biometric information. 5. The liquid crystal display device with the optical sensor of claim 1, wherein the driver IC is arranged in a manner that a center of the driver IC is aligned with a center of a display panel. 6. The liquid crystal display device with the optical sensor of claim 1, wherein the optical sensor includes: the photoelectric conversion element; a first electrode in contact with a lower surface of the photoelectric conversion element and formed of a metallic material; and a second electrode in contact with an upper surface of the photoelectric conversion element and formed of a transparent conductive material."
  ],
  "description_excerpt": "Embodiments described herein relate generally to a liquid crystal display device with an optical sensor.\n\nIn recent years, liquid crystal display devices (biometric devices) with built-in sensors that detect biometric information, such as fingerprint sensors and vein sensors, have been developed. Optical sensors using, for example, photoelectric conversion elements are used as this type of sensor. Optical sensors detect biometric information of an object by detecting light emitted from a light source such as a backlight and reflected by the object.\n\nAs a general liquid crystal display device is required to have a narrow frame, there is a demand for a narrow frame also in such liquid crystal display devices with optical sensors.\n\nFIG. 1 schematically shows a display device according to one embodiment.\n\nFIG. 2 is a plan view schematically showing the display device according to the embodiment.\n\nFIG. 3 is a plan view showing a configuration example of a touch sensor mounted on the display device according to the embodiment.\n\nFIG. 4 is an equivalent circuit diagram showing an optical sensor and a sensor circuit connected to the optical sensor according to the embodiment.\n\nFIG. 5 illustrates an operation example of the optical sensor and the sensor circuit connected to the optical sensor according to the embodiment.\n\nFIG. 6 is a schematic cross-sectional view showing an example of a structure that can be applied to a first substrate according to the embodiment.\n\nFIG. 7 is a schematic plan view showing an example of a structure that can be applied to the first substrate according to the embodiment.",
  "cpc": [
    "G09G 3/3607",
    "G06V 40/1318",
    "G09G 2354/00"
  ],
  "ipc": [
    "G06V 40/13",
    "G09G 3/36"
  ],
  "assignees": [
    "Magnolia White Corp"
  ],
  "inventors": [
    "Hiroyuki Abe",
    "Akihiko Saitoh",
    "Teppei Yamada"
  ],
  "filing_date": "2025-12-16",
  "publication_date": "2026-04-16",
  "priority_date": "2022-08-29",
  "application_number": "US-202519421238-A",
  "family_id": "89997183",
  "cited_by_count": 0,
  "citations": [
    "US20160013426A1",
    "US20210034833A1",
    "US20210109639A1",
    "US20220335743A1",
    "US12142236B2"
  ]
}