Display panel and display device
A technology for display panels and substrate substrates, which is used in printing image acquisition, instruments, computing, etc., can solve the problems of small storage capacitance, fingerprint detection errors of fingerprint identification units, and affecting the normal use of display panels.
Active Publication Date: 2019-12-24
SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
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- Application Information
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Problems solved by technology
The fingerprint identification unit usually includes a photodiode and a storage capacitor, which together convert the reflected light through the touch body into a current / voltage signal, but due to the small capacitance value of the storage capacitor in the prior art, the fingerprint identification unit exists The risk of false fingerprint detection affects the normal use of the display panel
Method used
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[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0028] figure 1 A schematic diagram of the circuit structure of a fingerprint identification unit provided by an embodiment of the present invention, refer to figure 1 , the fingerprint identification unit circuit includes a photodiode D, a storage capacitor C and a thin film transistor T. The anode of the photodiode D is electrically connected to the first plate of the storage capacitor C, and the negative pole of the photodiode D is electrically connected to the second plate of the storage capacitor C and the s...
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The present invention provides a display panel and a display device. The display panel includes: a light-emitting unit array substrate, a packaging substrate, and at least one fingerprint identification unit; the fingerprint identification unit includes a common electrode, a second electrode, a PIN junction, and a first electrode; the second electrode 1. The first electrode and the PIN structure form a photodiode; the common electrode is electrically connected to the first electrode, and the second electrode and the common electrode form a storage capacitor; the common electrode and / or the first electrode include a first body portion and a first protruding portion; The two electrodes have a second body portion and a second protruding portion; the vertical projections of the first protruding portion and the second protruding portion on the base substrate overlap, and the vertical projections of the first protruding portion and the second protruding portion on the base substrate The projections are all located between the vertical projections of two adjacent light-emitting units along the second direction on the base substrate. The invention provides a display panel and a display device to improve the stability of fingerprint detection.
Description
technical field [0001] Embodiments of the present invention relate to display technologies, and in particular, to a display panel and a display device. Background technique [0002] Since fingerprints are inherent to each person, they are unique. With the development of technology, a variety of display devices with fingerprint recognition functions appear on the market, such as mobile phones, tablet computers, and smart wearable devices. In this way, before operating the display device with the fingerprint recognition function, the user only needs to touch the fingerprint recognition unit of the display device with a finger to perform authority verification, which simplifies the authority verification process. [0003] Fingerprints are composed of a series of ridges and valleys located on the surface of the fingertip skin. Since the intensity of light reflected by the ridges and valleys received by the fingerprint recognition unit is different, the reflected light formed at...
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IPC IPC(8): G06F3/041G06K9/00
CPCG06F3/041G06V40/1318
Inventor 张卿曾洋王丽花杨康丁洪杜凌霄谢亮柴慧平姚绮君
Owner SHANGHAI TIANMA MICRO ELECTRONICS CO LTD