WO2003071342A1 - Lcd panel with image acquisition part and method of manufacturing same - Google Patents

Lcd panel with image acquisition part and method of manufacturing same Download PDF

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Publication number
WO2003071342A1
WO2003071342A1 PCT/KR2003/000357 KR0300357W WO03071342A1 WO 2003071342 A1 WO2003071342 A1 WO 2003071342A1 KR 0300357 W KR0300357 W KR 0300357W WO 03071342 A1 WO03071342 A1 WO 03071342A1
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WO
WIPO (PCT)
Prior art keywords
image acquisition
color filter
lcd panel
black matrix
light sensing
Prior art date
Application number
PCT/KR2003/000357
Other languages
French (fr)
Inventor
Sung-Hyu Shin
Kyong-Il Min
Original Assignee
Nitgen Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitgen Co., Ltd. filed Critical Nitgen Co., Ltd.
Priority to AU2003210017A priority Critical patent/AU2003210017A1/en
Publication of WO2003071342A1 publication Critical patent/WO2003071342A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14643—Photodiode arrays; MOS imagers
    • H01L27/14645—Colour imagers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
    • H01L31/09—Devices sensitive to infrared, visible or ultraviolet radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13312—Circuits comprising photodetectors for purposes other than feedback
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/1462—Coatings
    • H01L27/14621—Colour filter arrangements

Definitions

  • the present invention relates generally to an LCD panel with an image acquisition, unit and method of manufacturing the same, and more particularly to a liquid crystal display panel with an image acquisition unit and method of manufacturing the same, in which the image acquisition unit is formed on the color filter substrate of the liquid crystal display panel, thereby performing both the display of information through the liquid crystal display panel and the acquisition of an image such as a fingerprint.
  • a Liquid Crystal Display (LCD) panel is a device, which is comprised of a plurality of unit cells and displays information images by controlling the amounts of light passing through the cells according to light irradiated from a backlight and cell signals inputted from a data drive unit.
  • LCD Liquid Crystal Display
  • An image acquisition panel is a device, in which unit cells, each comprised of a light sensing part, a switching part and a storage capacitor, are lengthwise and crosswise arranged on a transparent substrate, and which acquires an image by irradiating light on an object (on which a pattern, such as a fingerprint, a character, a picture or the like, is formed) in contact with the image acquisition panel and sensing and storing light reflected by the object using the light sensing parts of the cells.
  • a Thin Film Transistor (TFT) sensor is representative of such image acquisition panels.
  • FIG. 1 shows a prior art LCD panel and image acquisition panel combination, in which an image acquisition panel 20, an LCD panel 10 and a backlight 30 are stacked in descending order.
  • Fig. 2a is a view showing the construction of a conventional LCD panel.
  • a TFT array substrate 11, an LCD plate 12 and a color filter substrate 13 are stacked with one on top of another in ascending order.
  • the color filter substrate 13 has a configuration in which a plurality of sets 15, each comprising sequentially arranged red, green and blue cells, are lengthwise and crosswise arranged.
  • the boundaries of the cells are opaque to prevent light from passing therethrough, so the resolution of a displayed image is improved.
  • the opaque portions are referred to as a black matrix.
  • a structure of the color filter substrate 13 is shown in Fig. 2b.
  • Fig. 2b is a sectional view showing the structure of a unit cell of the color filter substrate.
  • the black matrix layer 142 constituting the boundaries of the cells is formed on a glass substrate 144 first, and a color filter layer 141 is formed thereon later.
  • An electrode 143 is formed on the color filter layer 141.
  • Fig. 3 is a longitudinal section showing a unit cell of the image acquisition panel using a thin film transistor.
  • the image acquisition panel is a kind of contact type image sensor using the photosensitivity of a-Si:H, and can achieve a great photosensitivity with a relatively thin structure.
  • a light sensing part 112 and a switching part 113 are crosswise arranged on a transparent substrate 111, and a backlight L is disposed under the transparent substrate 111 to irradiate light upwardly through the image acquisition panel 1 10.
  • a source electrode 112-S of the light sensing part 112 and a drain electrode 113-D of the switching part 113 are electrically connected to each other by a first electrode 114, and a second electrode 115 is connected to a gate electrode 112- G of the light sensing electrode 115.
  • a photosensitive layer 112-P such as an amorphous silicon a-Si:H, is formed between a drain electrode 112- D and a source electrode 112-S of the light sensing part 112, so the drain electrode 112-D and the source electrode 112-S are electrically connected to each other when light whose intensity is greater than a certain amount is irradiated on the photosensitive layer 112-P.
  • a fingerprint is brought into contact with the image acquisition panel 110, light L irradiated from the backlight situated under the transparent substrate 111 is reflected according to the pattern of the fingerprint and received by the photosensitive layer 112-P of the light sensing part 112, thus activating the light sensing part 112.
  • the switching part 113 is set to scan a fingerprint in response to a gate control signal applied to a gate terminal 113-G and switched at every frame, so the image of the fingerprint inputted to the image acquisition panel 110 is scanned by light sensing parts 112 and, thereafter, forms a frame. Accordingly, the switching part 113 is covered with a light shielding layer 113-sh over a range from the drain electrode 113-D to the source electrode 112-S so as to prevent outside light from entering the switching part 113.
  • the LCD panel and image acquisition panel combination can be implemented by stacking the LCD panel shown in Fig. 2a and the image acquisition panel shown in Fig. 3.
  • light irradiated from the backlight 30 passes through a displayed image on the LCD panel 10
  • the light passing through the displayed image passes through the image acquisition panel 20 positioned over the LCD panel 10
  • the light passing through the image acquisition panel 20 is reflected by an object positioned on a surface of the image acquisition panel 20.
  • the reflected light is sensed by the light sensing parts of the cells of the image acquisition panel 20, converted into photo-electricity, stored by the storage capacitor in the form of electric charges, and sequentially outputted by the switching part according to control signals.
  • the cells of the LCD panel 10 display information in the form of an image by the operations of a display data drive unit (not shown) and a gate drive unit (not shown), and a user can view the image displayed on the LCD panel 10 through the transparent image acquisition panel 20.
  • a display data drive unit not shown
  • a gate drive unit not shown
  • the prior art LCD panel and image acquisition panel combination has the following disadvantages as well as the above advantages.
  • a light shielding layer is present in the image acquisition panel, so light is not uniformly irradiated onto a subject. Accordingly, the quality of an image sensed by the image acquisition panel is deteriorated.
  • the LCD panel and the image acquisition panel are separately manufactured and, thereafter, combined with each other, so the positions of the openings (through which light passes) of the LCD panel and the image acquisition panel do not coincide with each other. Accordingly, ' the quality of an image displayed by the LCD panel is deteriorated. Additionally, the quality of an image acquired by the image acquisition panel is also deteriorated. Fourth, the source and drain electrodes of the light sensing part transistor can be replaced with transparent conductive oxide electrodes such as Indium Tin Oxide (ITO) electrodes, but the characteristics of the image acquisition panel are deteriorated because such an oxide electrode has a low conductivity in comparison with a metallic electrode. Fifth, the LCD panel and the image acquisition panel are separately manufactured and, thereafter, combined with each other, so the manufacturing costs thereof are increased and the devices may be damaged by physical impact during assembly.
  • ITO Indium Tin Oxide
  • an object of the present invention is to provide an LCD panel with an image acquisition unit and method of manufacturing the same, in which an image acquisition unit is formed on a color filter substrate of an LCD panel, differently from a conventional LCD panel in which an image acquisition panel is stacked on an LCD panel.
  • the present invention provides LCD panel with an image acquisition unit, comprising: the LCD panel comprised of a color filter substrate, the color filter substrate including a black matrix layer formed on a glass substrate and a color filter layer formed thereon; and the image acquisition unit formed on the color filter substrate of the LCD panel and comprised of a light sensing part, a switching part and a storage capacitor.
  • the light sensing part of the image acquisition unit may include first source, first drain and first gate electrodes, and the switching unit thereof may include second source, second drain and second gate electrodes.
  • the light sensing part and switching part of the LCD panel may be formed within a region occupied by the black matrix layer included in the color filter substrate, the storage capacitor of the LCD panel may be formed outside of the region occupied by the black matrix layer, and the electrodes of the storage capacitor are transparent.
  • a position, at which the image acquisition unit is formed, may be changed.
  • the image acquisition panel may be formed on a surface of the glass substrate of the color filter substrate of the LCD panel opposite to a surface of the glass substrate in contact with the black matrix layer.
  • the image acquisition panel may be formed on a surface of the glass substrate of the color filter substrate of the LCD panel in contact with the black matrix layer.
  • the switching unit further comprises a light shielding layer.
  • the first gate electrode is transparent.
  • the present invention provides a method of forming an image acquisition unit on a color filter substrate of an LCD panel, the image acquisition unit having a light sensing part, a switching part and a storage capacitor provided with electrodes, the color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon, comprising the steps of: forming the black matrix layer and the color filter layer on a surface of the glass substrate of the color filter substrate; forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate of the color filter substrate of the LCD panel opposite to a surface of the glass substrate in contact with the black matrix layer so that the light sensing part and switching part are formed within a region occupied by the black matrix layer included in the color filter substrate, the storage capacitor is formed outside of the region occupied by the black matrix layer and the electrodes of the storage capacitor are formed to be transparent; and forming a light shielding layer on the switching part so as to prevent light from entering the switching part.
  • the forming method of the present invention may be comprised of the steps of: forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate; and forming the black matrix layer and the color filter layer on a surface of the glass substrate opposite to a surface of the glass substrate on which the image acquisition panel is formed so that at least the light sensing part and switching part of the image acquisition panel are covered with the black matrix layer and the electrodes of the storage capacitor are formed to be transparent.
  • a method of forming an image acquisition unit on a color filter substrate of an LCD panel may comprise the steps of forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate so that the first gate electrode of the light sensing part and the electrodes of the storage capacitor are formed to be transparent; and forming the black matrix layer and the color filter layer after forming an insulating layer on surfaces of the light sensing part, the switching part and the storage capacitor so that at least the light sensing part and the switching part are covered with the black matrix layer.
  • Fig. 1 is a schematic perspective view of a prior art LCD panel and image acquisition panel combination
  • Fig. 2a is a view showing a construction of a prior art LCD panel
  • Fig. 2b is a longitudinal section showing a construction of a unit cell of a color filter substrate applied to the LCD panel
  • Fig. 3 is a view showing a construction of a unit cell of a prior art image acquisition panel
  • Fig. 4 is a view showing a basic concept of the present invention
  • Fig. 5 is a view showing a construction of a unit cell of an image acquisition unit
  • Fig. 6 is a sectional view of an LCD panel with an image acquisition unit in accordance with a first embodiment of the present invention
  • Fig. 7 is a sectional view of an LCD panel with an image acquisition unit in accordance with a second embodiment of the present invention.
  • Fig. 8 is a block diagram of the LCD panel with the image acquisition unit in accordance with the present invention, including drive units.
  • FIG. 4 A basic concept of the present invention is illustrated in Fig. 4.
  • An image acquisition unit is formed on a color filter substrate 13 constituting an LCD panel.
  • a light sensing part 42 and a switching part 43 of the image acquisition unit are formed within a region where a black matrix layer 41 is situated, and a storage capacitor 44 is formed outside of the region. That is, the basic concept of the present invention is to form the light sensing part and switching part of the image acquisition unit to be covered by the black matrix layer 41 because the black matrix layer 41 must be present in an LCD panel.
  • Fig. 5 represents the unit cell of the image acquisition unit shown in Fig. 2a in a different manner for ease of understanding.
  • a light sensing part 60, a switching part 70 and a storage capacitor 80 are formed on a glass substrate 50.
  • the light sensing part 60 includes a first gate 61 and a first source/ drain electrode 62
  • the switching part 70 includes a second gate 71 and a second source/drain electrode 72.
  • a light shielding layer 73 is formed in the switching part 70, so light cannot be irradiated from the outside.
  • the storage capacitor 80 includes two electrodes 81 and 81 '.
  • reference numerals "63” and “73” each designate a photosensitive layer such as a-Si:H or the like
  • reference numerals "64", “74” and “82” each designate an insulating layer
  • reference number "51” designates a surface protecting layer.
  • Fig. 6 shows a first embodiment.
  • Fig. 6 illustrates how the image acquisition unit, which is constructed as depicted in Fig. 6, is formed on a color filter substrate of an LCD panel.
  • the LCD panel includes the color filter substrate; which has a glass substrate 144, a black matrix layer 142 formed on the glass substrate 144 and a color filter layer 141 formed on the glass substrate 144 and the black matrix layer 142.
  • Fig. 6 shows that the image acquisition unit is formed on a surface of the glass substrate 144 of the color filter substrate of the LCD panel opposite to a surface thereof in contact with the black matrix layer 142.
  • the light sensing part 60, the switching part 70 and the storage capacity 80 are formed from the glass substrate 144 of the color filter substrate.
  • the image acquisition unit is formed on a surface of the glass layer 144 opposite to a surface of the glass layer 144, other steps can be carried out after one of color filter forming and image acquiring steps is carried out.
  • a step of forming a semiconductor on the glass substrate 144 can be easily performed by those skilled in the art by photolithography or the like.
  • the 6 is comprised the steps of forming the black matrix layer 142 and the color filter layer 141 on a surface of the glass substrate 144 of the color filter substrate; and forming the light sensing part 60, switching part 70 and storage capacitor 80 of the image acquisition panel on a surface of the glass substrate 144 of the color filter substrate of the LCD panel opposite to a surface of the glass substrate 144 in contact with the black matrix layer 142, so that the light sensing part 60 and switching part 70 are formed within a region occupied by the black matrix layer 142 included in the color filter substrate, the storage capacitor 80 is formed outside of the region occupied by the black matrix layer 142, and the electrodes 81 and 81 ' of the storage capacitor 80 are formed to be transparent.
  • this LCD panel manufacturing method may be comprised of the steps of forming the light sensing part 60, switching part 70 and storage capacitor 80 of the image acquisition panel on a surface of the glass substrate 144; and forming the black matrix layer 142 and the color filter layer 141 on a surface of the glass substrate 144 opposite to a surface of the glass substrate 144 on which the image acquisition panel is formed, so that at least the light sensing part 60 and switching part 70 of the image acquisition panel are covered with the black matrix layer 142, and the electrodes 81 and 81 ' of the storage capacitor are formed to be transparent.
  • the image acquisition unit can be formed on a surface of the glass substrate 144 with which a black matrix layer 142 comes into contact, as shown in Fig. 7. That is, in a second embodiment shown in Fig. 7, the image acquisition unit is formed on the glass substrate 144 before the black matrix layer 142 is formed on the glass substrate 144.
  • the construction of the image acquisition unit of Fig. 7 is similar to that of the image acquisition unit of Fig. 6. However, the image acquisition unit of Fig. 7 is different from that of Fig. 6 in that it is necessary to irradiate light from the outside onto a light sensing part 60 because the glass substrate 144 is disposed between first and second gates 61 and 71 and the outside. Accordingly, in Fig. 7, the first gate 61 of the light sensing part 60 is comprised of a transparent electrode. Additionally, in Fig. 6, the light shielding layer 73 is formed to prevent outside light from being irradiated onto the switching part 70; while in Fig. 7, the second gate 71 is comprised ' of a transparent electrode to provide an advantage of allowing the light shielding layer 144 to be eliminated.
  • the LCD panel shown in Fig. 7 can be manufactured by technology known to those skilled in the art. However, differently from the LCD panel of Fig. 6, the LCD panel of Fig. 7 can be sequentially formed in the ' descending order of the glass substrate 144, the image acquisition unit and the color filter substrate in a single direction, so the manufacture of the LCD panel can be effectively carried out. In contrast, for the LCD panel of Fig. 6, the image acquisition unit and the color filter panel are formed in opposite sides on and under the glass substrate 144, respectively.
  • a method of manufacturing the LCD panel shown in Fig. 7 is comprised of the steps of forming a light sensing part 60, a switching part 70 and a storage capacitor 80 of an image acquisition panel on a surface of a glass substrate 144 so that a first gate electrode 61 of the light sensing part 60 and electrodes 81 and 81 ' of the storage capacitor 80 are formed to be transparent; and forming a black matrix layer 142 and a color filter layer 141 after forming an insulating layer 83 on surfaces of the light sensing part 60, the switching part 70 and the storage capacitor 80, so that at least the light sensing part 60 and the switching part 70 are covered with the black matrix layer 142.
  • a second gate electrode 71 of the switching part 70 is formed to be opaque so as to block outside light.
  • Fig. 8 is a block diagram of the LCD panel with an image acquisition unit in accordance with the present invention, including drive units.
  • Display image signals drive unit cells by the operations of a display data drive unit 91 and an LCD gate drive unit 92 to display images, while the image acquisition unit reads the image of an object and outputs the signal of the image by the operations of a image acquisition unit gate drive unit 93 and an output signal processing unit 94.
  • the above operations are not described in detail here, since they are well known to those skilled in the art.
  • the present invention provides an LCD panel, which is capable of reducing the power consumption of a light source and preventing the quality of a displayed image from being deteriorated.
  • the image acquisition unit can be manufactured together with the LCD panel, so manufacturing costs thereof can be reduced and the difficulty of assembly thereof can be eliminated.

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  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
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Abstract

Disclosed herein is an LCD panel with an image acquisition unit and method of manufacturing the same. The LCD panel with the image acquisition unit includes the LCD panel and the image acquisition unit. The LCD panel includes a color filter substrate, which has a black matrix layer formed on a glass substrate and a color filter layer formed thereon. The image acquisition unit is formed on the color filter substrate of the LCD panel, and includes a light sensing part, a switching part and a storage capacitor.

Description

LCD PANEL WITH IMAGE ACQUISITION PART AND METHOD OF
MANUFACTURING SAME
Technical Field The present invention relates generally to an LCD panel with an image acquisition, unit and method of manufacturing the same, and more particularly to a liquid crystal display panel with an image acquisition unit and method of manufacturing the same, in which the image acquisition unit is formed on the color filter substrate of the liquid crystal display panel, thereby performing both the display of information through the liquid crystal display panel and the acquisition of an image such as a fingerprint.
Background Art
As well known to those skilled in the art, a Liquid Crystal Display (LCD) panel is a device, which is comprised of a plurality of unit cells and displays information images by controlling the amounts of light passing through the cells according to light irradiated from a backlight and cell signals inputted from a data drive unit. An image acquisition panel is a device, in which unit cells, each comprised of a light sensing part, a switching part and a storage capacitor, are lengthwise and crosswise arranged on a transparent substrate, and which acquires an image by irradiating light on an object (on which a pattern, such as a fingerprint, a character, a picture or the like, is formed) in contact with the image acquisition panel and sensing and storing light reflected by the object using the light sensing parts of the cells. A Thin Film Transistor (TFT) sensor is representative of such image acquisition panels.
A prior art apparatus, in which an LCD panel and an image acquisition panel are stacked with one on top of the other, and which displays information by the LCD panel and acquires images by the image acquisition panel, has been developed (see Korean Pat. Appln. No. 10-2001-0031067 filed by the present applicant). In this apparatus, the two panels can employ a single backlight because all the panels require backlights as light sources, and the LCD panel, the image acquisition panel, the LCD panel and the backlight are stacked with one on top of another in descending order because the image acquisition panel is transparent. Accordingly, the prior art apparatus is effective in minimizing space occupied thereby and reducing the number of component parts. Fig. 1 shows a prior art LCD panel and image acquisition panel combination, in which an image acquisition panel 20, an LCD panel 10 and a backlight 30 are stacked in descending order.
Fig. 2a is a view showing the construction of a conventional LCD panel. In the conventional LCD panel, a TFT array substrate 11, an LCD plate 12 and a color filter substrate 13 are stacked with one on top of another in ascending order. The color filter substrate 13 has a configuration in which a plurality of sets 15, each comprising sequentially arranged red, green and blue cells, are lengthwise and crosswise arranged. The boundaries of the cells are opaque to prevent light from passing therethrough, so the resolution of a displayed image is improved. The opaque portions are referred to as a black matrix. A structure of the color filter substrate 13 is shown in Fig. 2b. Fig. 2b is a sectional view showing the structure of a unit cell of the color filter substrate. In this drawing, the black matrix layer 142 constituting the boundaries of the cells is formed on a glass substrate 144 first, and a color filter layer 141 is formed thereon later. An electrode 143 is formed on the color filter layer 141.
In the meantime, the image acquisition panel is constructed as indicated in Fig. 3. Fig. 3 is a longitudinal section showing a unit cell of the image acquisition panel using a thin film transistor. The image acquisition panel is a kind of contact type image sensor using the photosensitivity of a-Si:H, and can achieve a great photosensitivity with a relatively thin structure. Referring to Fig. 3, in an image acquisition panel 110, a light sensing part 112 and a switching part 113 are crosswise arranged on a transparent substrate 111, and a backlight L is disposed under the transparent substrate 111 to irradiate light upwardly through the image acquisition panel 1 10. A source electrode 112-S of the light sensing part 112 and a drain electrode 113-D of the switching part 113 are electrically connected to each other by a first electrode 114, and a second electrode 115 is connected to a gate electrode 112- G of the light sensing electrode 115. In this construction, a photosensitive layer 112-P, such as an amorphous silicon a-Si:H, is formed between a drain electrode 112- D and a source electrode 112-S of the light sensing part 112, so the drain electrode 112-D and the source electrode 112-S are electrically connected to each other when light whose intensity is greater than a certain amount is irradiated on the photosensitive layer 112-P. As a result, when an object (in Fig. 2b, a fingerprint) is brought into contact with the image acquisition panel 110, light L irradiated from the backlight situated under the transparent substrate 111 is reflected according to the pattern of the fingerprint and received by the photosensitive layer 112-P of the light sensing part 112, thus activating the light sensing part 112. The switching part 113 is set to scan a fingerprint in response to a gate control signal applied to a gate terminal 113-G and switched at every frame, so the image of the fingerprint inputted to the image acquisition panel 110 is scanned by light sensing parts 112 and, thereafter, forms a frame. Accordingly, the switching part 113 is covered with a light shielding layer 113-sh over a range from the drain electrode 113-D to the source electrode 112-S so as to prevent outside light from entering the switching part 113.
As shown in Fig. 1, the LCD panel and image acquisition panel combination can be implemented by stacking the LCD panel shown in Fig. 2a and the image acquisition panel shown in Fig. 3. Referring again to Fig. 1 , light irradiated from the backlight 30 passes through a displayed image on the LCD panel 10, the light passing through the displayed image passes through the image acquisition panel 20 positioned over the LCD panel 10, and the light passing through the image acquisition panel 20 is reflected by an object positioned on a surface of the image acquisition panel 20. The reflected light is sensed by the light sensing parts of the cells of the image acquisition panel 20, converted into photo-electricity, stored by the storage capacitor in the form of electric charges, and sequentially outputted by the switching part according to control signals. Meanwhile, the cells of the LCD panel 10 display information in the form of an image by the operations of a display data drive unit (not shown) and a gate drive unit (not shown), and a user can view the image displayed on the LCD panel 10 through the transparent image acquisition panel 20. However, the prior art LCD panel and image acquisition panel combination has the following disadvantages as well as the above advantages.
First, light having reached the image acquisition panel through the LCD panel is reduced in its amount while passing through the substrate of the image acquisition panel, so a relatively small amount of light arrives at a subject, thereby reducing the efficiency of image acquisition. The amount of light of a backlight must be increased so as to compensate for the small amount of light, so an increase in power consumption is caused.
Second, a light shielding layer is present in the image acquisition panel, so light is not uniformly irradiated onto a subject. Accordingly, the quality of an image sensed by the image acquisition panel is deteriorated.
Third, the LCD panel and the image acquisition panel are separately manufactured and, thereafter, combined with each other, so the positions of the openings (through which light passes) of the LCD panel and the image acquisition panel do not coincide with each other. Accordingly, 'the quality of an image displayed by the LCD panel is deteriorated. Additionally, the quality of an image acquired by the image acquisition panel is also deteriorated. Fourth, the source and drain electrodes of the light sensing part transistor can be replaced with transparent conductive oxide electrodes such as Indium Tin Oxide (ITO) electrodes, but the characteristics of the image acquisition panel are deteriorated because such an oxide electrode has a low conductivity in comparison with a metallic electrode. Fifth, the LCD panel and the image acquisition panel are separately manufactured and, thereafter, combined with each other, so the manufacturing costs thereof are increased and the devices may be damaged by physical impact during assembly.
Disclosure of Invention
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an LCD panel with an image acquisition unit and method of manufacturing the same, in which an image acquisition unit is formed on a color filter substrate of an LCD panel, differently from a conventional LCD panel in which an image acquisition panel is stacked on an LCD panel.
In order to accomplish the above object, the present invention provides LCD panel with an image acquisition unit, comprising: the LCD panel comprised of a color filter substrate, the color filter substrate including a black matrix layer formed on a glass substrate and a color filter layer formed thereon; and the image acquisition unit formed on the color filter substrate of the LCD panel and comprised of a light sensing part, a switching part and a storage capacitor. The light sensing part of the image acquisition unit may include first source, first drain and first gate electrodes, and the switching unit thereof may include second source, second drain and second gate electrodes. Additionally, the light sensing part and switching part of the LCD panel may be formed within a region occupied by the black matrix layer included in the color filter substrate, the storage capacitor of the LCD panel may be formed outside of the region occupied by the black matrix layer, and the electrodes of the storage capacitor are transparent.
A position, at which the image acquisition unit is formed, may be changed. First, the image acquisition panel may be formed on a surface of the glass substrate of the color filter substrate of the LCD panel opposite to a surface of the glass substrate in contact with the black matrix layer. Second, the image acquisition panel may be formed on a surface of the glass substrate of the color filter substrate of the LCD panel in contact with the black matrix layer.
For the above first case, the switching unit further comprises a light shielding layer. For the above second case, the first gate electrode is transparent.
In addition, the present invention provides a method of forming an image acquisition unit on a color filter substrate of an LCD panel, the image acquisition unit having a light sensing part, a switching part and a storage capacitor provided with electrodes, the color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon, comprising the steps of: forming the black matrix layer and the color filter layer on a surface of the glass substrate of the color filter substrate; forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate of the color filter substrate of the LCD panel opposite to a surface of the glass substrate in contact with the black matrix layer so that the light sensing part and switching part are formed within a region occupied by the black matrix layer included in the color filter substrate, the storage capacitor is formed outside of the region occupied by the black matrix layer and the electrodes of the storage capacitor are formed to be transparent; and forming a light shielding layer on the switching part so as to prevent light from entering the switching part.
The forming method of the present invention may be comprised of the steps of: forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate; and forming the black matrix layer and the color filter layer on a surface of the glass substrate opposite to a surface of the glass substrate on which the image acquisition panel is formed so that at least the light sensing part and switching part of the image acquisition panel are covered with the black matrix layer and the electrodes of the storage capacitor are formed to be transparent.
In accordance with another feature of the present invention, a method of forming an image acquisition unit on a color filter substrate of an LCD panel, the image acquisition unit having a light sensing part provided with a first gate electrode, a switching part provided with a second gate electrode and a storage capacitor provided with electrodes, the color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon, may comprise the steps of forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate so that the first gate electrode of the light sensing part and the electrodes of the storage capacitor are formed to be transparent; and forming the black matrix layer and the color filter layer after forming an insulating layer on surfaces of the light sensing part, the switching part and the storage capacitor so that at least the light sensing part and the switching part are covered with the black matrix layer. Brief Description of Drawings
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is a schematic perspective view of a prior art LCD panel and image acquisition panel combination;
Fig. 2a is a view showing a construction of a prior art LCD panel; Fig. 2b is a longitudinal section showing a construction of a unit cell of a color filter substrate applied to the LCD panel; Fig. 3 is a view showing a construction of a unit cell of a prior art image acquisition panel;
Fig. 4 is a view showing a basic concept of the present invention; Fig. 5 is a view showing a construction of a unit cell of an image acquisition unit; Fig. 6 is a sectional view of an LCD panel with an image acquisition unit in accordance with a first embodiment of the present invention;
Fig. 7 is a sectional view of an LCD panel with an image acquisition unit in accordance with a second embodiment of the present invention; and
Fig. 8 is a block diagram of the LCD panel with the image acquisition unit in accordance with the present invention, including drive units.
Preferred embodiment for Carrying out the Invention
A basic concept of the present invention is illustrated in Fig. 4. An image acquisition unit is formed on a color filter substrate 13 constituting an LCD panel. In more detail, as depicted in Fig. 4, a light sensing part 42 and a switching part 43 of the image acquisition unit are formed within a region where a black matrix layer 41 is situated, and a storage capacitor 44 is formed outside of the region. That is, the basic concept of the present invention is to form the light sensing part and switching part of the image acquisition unit to be covered by the black matrix layer 41 because the black matrix layer 41 must be present in an LCD panel.
Hereinafter, preferred embodiments of the present invention are described with reference to the accompanying drawings. Fig. 5 represents the unit cell of the image acquisition unit shown in Fig. 2a in a different manner for ease of understanding. A light sensing part 60, a switching part 70 and a storage capacitor 80 are formed on a glass substrate 50. As described in the "description of the prior art" section, the light sensing part 60 includes a first gate 61 and a first source/ drain electrode 62, and the switching part 70 includes a second gate 71 and a second source/drain electrode 72. A light shielding layer 73 is formed in the switching part 70, so light cannot be irradiated from the outside. The storage capacitor 80 includes two electrodes 81 and 81 '. In Fig. 5, reference numerals "63" and "73" each designate a photosensitive layer such as a-Si:H or the like, reference numerals "64", "74" and "82" each designate an insulating layer, and reference number "51 " designates a surface protecting layer.
Fig. 6 shows a first embodiment. In more detail, Fig. 6 illustrates how the image acquisition unit, which is constructed as depicted in Fig. 6, is formed on a color filter substrate of an LCD panel. The LCD panel includes the color filter substrate; which has a glass substrate 144, a black matrix layer 142 formed on the glass substrate 144 and a color filter layer 141 formed on the glass substrate 144 and the black matrix layer 142.
Fig. 6 shows that the image acquisition unit is formed on a surface of the glass substrate 144 of the color filter substrate of the LCD panel opposite to a surface thereof in contact with the black matrix layer 142. The light sensing part 60, the switching part 70 and the storage capacity 80 are formed from the glass substrate 144 of the color filter substrate. In Fig. 6, since the image acquisition unit is formed on a surface of the glass layer 144 opposite to a surface of the glass layer 144, other steps can be carried out after one of color filter forming and image acquiring steps is carried out. A step of forming a semiconductor on the glass substrate 144 can be easily performed by those skilled in the art by photolithography or the like. An LCD panel manufacturing method of Fig. 6 is comprised the steps of forming the black matrix layer 142 and the color filter layer 141 on a surface of the glass substrate 144 of the color filter substrate; and forming the light sensing part 60, switching part 70 and storage capacitor 80 of the image acquisition panel on a surface of the glass substrate 144 of the color filter substrate of the LCD panel opposite to a surface of the glass substrate 144 in contact with the black matrix layer 142, so that the light sensing part 60 and switching part 70 are formed within a region occupied by the black matrix layer 142 included in the color filter substrate, the storage capacitor 80 is formed outside of the region occupied by the black matrix layer 142, and the electrodes 81 and 81 ' of the storage capacitor 80 are formed to be transparent.
In the manufacture of the LCD panel shown in Fig. 6, any of the image acquisition panel and the color filter substrate can be formed on the glass substrate 144 first, so the LCD panel of the present invention can be manufactured in the following process. That is, this LCD panel manufacturing method may be comprised of the steps of forming the light sensing part 60, switching part 70 and storage capacitor 80 of the image acquisition panel on a surface of the glass substrate 144; and forming the black matrix layer 142 and the color filter layer 141 on a surface of the glass substrate 144 opposite to a surface of the glass substrate 144 on which the image acquisition panel is formed, so that at least the light sensing part 60 and switching part 70 of the image acquisition panel are covered with the black matrix layer 142, and the electrodes 81 and 81 ' of the storage capacitor are formed to be transparent. In the meantime, where an image acquisition unit is formed on a surface of a glass substrate 144 of a color filter substrate of an LCD panel, the image acquisition unit can be formed on a surface of the glass substrate 144 with which a black matrix layer 142 comes into contact, as shown in Fig. 7. That is, in a second embodiment shown in Fig. 7, the image acquisition unit is formed on the glass substrate 144 before the black matrix layer 142 is formed on the glass substrate 144.
The construction of the image acquisition unit of Fig. 7 is similar to that of the image acquisition unit of Fig. 6. However, the image acquisition unit of Fig. 7 is different from that of Fig. 6 in that it is necessary to irradiate light from the outside onto a light sensing part 60 because the glass substrate 144 is disposed between first and second gates 61 and 71 and the outside. Accordingly, in Fig. 7, the first gate 61 of the light sensing part 60 is comprised of a transparent electrode. Additionally, in Fig. 6, the light shielding layer 73 is formed to prevent outside light from being irradiated onto the switching part 70; while in Fig. 7, the second gate 71 is comprised ' of a transparent electrode to provide an advantage of allowing the light shielding layer 144 to be eliminated.
The LCD panel shown in Fig. 7 can be manufactured by technology known to those skilled in the art. However, differently from the LCD panel of Fig. 6, the LCD panel of Fig. 7 can be sequentially formed in the' descending order of the glass substrate 144, the image acquisition unit and the color filter substrate in a single direction, so the manufacture of the LCD panel can be effectively carried out. In contrast, for the LCD panel of Fig. 6, the image acquisition unit and the color filter panel are formed in opposite sides on and under the glass substrate 144, respectively.
A method of manufacturing the LCD panel shown in Fig. 7 is comprised of the steps of forming a light sensing part 60, a switching part 70 and a storage capacitor 80 of an image acquisition panel on a surface of a glass substrate 144 so that a first gate electrode 61 of the light sensing part 60 and electrodes 81 and 81 ' of the storage capacitor 80 are formed to be transparent; and forming a black matrix layer 142 and a color filter layer 141 after forming an insulating layer 83 on surfaces of the light sensing part 60, the switching part 70 and the storage capacitor 80, so that at least the light sensing part 60 and the switching part 70 are covered with the black matrix layer 142. A second gate electrode 71 of the switching part 70 is formed to be opaque so as to block outside light.
Fig. 8 is a block diagram of the LCD panel with an image acquisition unit in accordance with the present invention, including drive units. Display image signals drive unit cells by the operations of a display data drive unit 91 and an LCD gate drive unit 92 to display images, while the image acquisition unit reads the image of an object and outputs the signal of the image by the operations of a image acquisition unit gate drive unit 93 and an output signal processing unit 94. The above operations are not described in detail here, since they are well known to those skilled in the art. As described above, the present invention provides an LCD panel, which is capable of reducing the power consumption of a light source and preventing the quality of a displayed image from being deteriorated. Additionally, light can be uniformly irradiated on a subject over the LCD panel, so the efficiency and performance of the image acquisition unit can be improved. Further, the image acquisition unit can be manufactured together with the LCD panel, so manufacturing costs thereof can be reduced and the difficulty of assembly thereof can be eliminated.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

What Is Claimed Is:
1. A Liquid Crystal Display (LCD) panel with an image acquisition unit, comprising: an LCD panel comprised of a color filter substrate, the color filter substrate including a black matrix layer formed on a glass substrate and a color filter layer formed thereon; and an image acquisition unit formed on the color filter substrate of the LCD panel and comprised of a light sensing part, a switching part and a storage capacitor.
2. The LCD panel according to claim 1, wherein: the light sensing part of the image acquisition unit includes a first gate electrode, the switching part thereof includes a second gate electrode, and the storage capacitor includes electrodes; the light sensing part and switching part of the LCD panel are formed within a region occupied by the black matrix layer included in the color filter substrate; and the storage capacitor of the LCD panel is formed outside of the region occupied by the black matrix layer, and the electrodes of the storage capacitor are transparent.
3. The LCD panel according to claim 2, wherein the light sensing part and switching part of the image acquisition panel are formed on a surface of the glass substrate of the color filter substrate of the LCD panel opposite to a surface of the glass substrate in contact with the black matrix layer.
4. The LCD panel according to claim 3, wherein the switching part further comprises a light shielding layer.
5. The LCD panel according to claim 2, wherein the light sensing part and switching part of the image acquisition panel are formed on a surface of the glass substrate of the color filter substrate of the LCD panel in contact with the black matrix layer.
6. The LCD panel according to claim 5, wherein the first gate electrode is transparent.
7. A method of forming an image acquisition unit on a color filter substrate of an LCD panel, the image acquisition unit having a light sensing part, a switching part and a storage capacitor provided with electrodes, the color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon, the method comprising the steps of: forming the black matrix layer and the color filter layer on a surface of the glass substrate of the color filter substrate; forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate of the color filter substrate of the LCD panel opposite to a surface of the glass substrate in contact with the black matrix layer, so that the light sensing part and switching part are formed within a region occupied by the black matrix layer included in the color filter substrate, the storage capacitor is formed outside of the region occupied by the black matrix layer, and the electrodes of the storage capacitor are formed to be transparent; and forming a light shielding layer on the switching part so as to prevent light from entering the switching part.
8. A method of forming an image acquisition unit on a color filter substrate of an LCD panel, the image acquisition unit having a light sensing part, a switching part and a storage capacitor provided with electrodes, the color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon, the method comprising the steps of: forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate; and forming the black matrix layer and the color filter layer on a surface of the glass substrate opposite to a surface of the glass substrate on which the image acquisition panel is formed, so that at least the light sensing part and switching part of the image acquisition panel are covered with the black matrix layer and the electrodes of the storage capacitor are formed to be transparent.
9. A method of forming an image acquisition unit on a color filter substrate of an LCD panel, the image acquisition unit having a light sensing part provided with a first gate electrode, a switching part provided with a second gate electrode and a storage capacitor provided with electrodes, the color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon, the method comprising the steps of: forming the light sensing part, switching part and storage capacitor of the image acquisition panel on a surface of the glass substrate so that the first gate electrode of the light sensing part and the electrodes of the storage capacitor are formed to be transparent; and forming the black matrix layer and the color filter layer after forming an insulating layer on surfaces of the light sensing part, the switching part and the storage capacitor, so that at least the light sensing part and the switching part are covered with the black matrix layer.
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