CN111338122A - Color film substrate, display panel and driving method thereof - Google Patents
Color film substrate, display panel and driving method thereof Download PDFInfo
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- CN111338122A CN111338122A CN202010219725.5A CN202010219725A CN111338122A CN 111338122 A CN111338122 A CN 111338122A CN 202010219725 A CN202010219725 A CN 202010219725A CN 111338122 A CN111338122 A CN 111338122A
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- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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- 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
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- 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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- 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
Abstract
The invention provides a color film substrate, a display panel and a driving method thereof. The color film substrate comprises a first substrate, a color resistance layer arranged on the first substrate, a transparent conducting layer and a plurality of pixel regions, wherein the first substrate comprises a plurality of pixel regions and a spacing region located between adjacent pixel regions, the color resistance layer is located in the pixel regions, the transparent conducting layer is located in the spacing region, the transparent conducting layer can apply set voltage, and an electric field is formed in a corresponding region of the box substrate to control liquid crystal deflection so as to enable light to penetrate through the transparent conducting layer. According to the color film substrate, the transparent conducting layer and the circuit routing line in the corresponding area on the opposite box substrate form an electric field by applying the set voltage to the transparent conducting layer, so that the deflection of liquid crystal in the opposite box gap of the color film substrate and the opposite box substrate is controlled, the light reflected by the fingerprint can smoothly reach the optical fingerprint identification layer below the opposite box substrate through the color film substrate, the fingerprint reflected light can meet the requirement of fingerprint identification, and the optical fingerprint identification function of the liquid crystal display panel is completed.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a color film substrate, a display panel and a driving method of the display panel.
Background
With the continuous development of the technology, the screen occupation ratio of mobile terminals such as mobile phones and the like is higher and higher, the full-screen mobile terminal becomes a development trend, and the traditional fingerprint unlocking occupies a certain screen face proportion, so that the under-screen fingerprint identification becomes a reliable technical solution. The most common optical fingerprint identification scheme at present is that when light irradiates the ridge lines of the finger, the light is reflected and passes through the screen to reach the optical sensor to realize fingerprint identification.
For the liquid crystal display screen integrated with the optical fingerprint identification sensor, in order to avoid light leakage, a black matrix is arranged among red, green and blue resistance layers on a color film substrate to cover, when a fingerprint touches the display screen, light contacts a finger and returns to the display screen through reflection of valley and ridge lines of the finger, because of the existence of the black matrix on the color film substrate, the light cannot penetrate through the black matrix between the color resistance layers, if the light penetrates through the red, green and blue resistance layers, because the red resistance layer only penetrates red light, the green resistance layer only penetrates green light, and the blue resistance layer only penetrates blue light, most light can be lost, namely the light transmittance is not high, the identification range of the optical fingerprint sensor cannot be reached, and the optical fingerprint identification cannot be used in the liquid crystal display screen.
Disclosure of Invention
The invention provides a color film substrate, a display panel and a driving method thereof, aiming at the problem that the optical fingerprint identification light transmittance under a liquid crystal display screen cannot meet the fingerprint identification requirement. The color film substrate applies the set voltage to the transparent conducting layer, so that light reflected by the fingerprint can smoothly pass through the color film substrate to reach the optical fingerprint identification layer below the box substrate, the reflected light of the fingerprint can meet the requirement of optical fingerprint identification, and the optical fingerprint identification function of the liquid crystal display panel is completed.
The invention provides a color film substrate which comprises a first substrate, a color resistance layer and a transparent conducting layer, wherein the color resistance layer is arranged on the first substrate, the first substrate comprises a plurality of pixel regions and a spacing region positioned between the adjacent pixel regions, the color resistance layer is positioned in the pixel regions, the transparent conducting layer is positioned in the spacing region, the transparent conducting layer can apply set voltage, and an electric field is formed in the corresponding region of a box substrate to control liquid crystal deflection so as to enable light to penetrate through the transparent conducting layer.
Optionally, the display device further comprises a black matrix, the black matrix is located in the spacer area, and an orthographic projection of the black matrix on the first substrate is located between the orthographic projections of the transparent conductive layer and the color resistance layer on the first substrate.
Optionally, along any arrangement direction of the pixel regions, the ratio of the widths of the black matrix and the transparent conductive layer in the spacer region is 1: 5-1: 4.
Optionally, the color resistance layer, the transparent conductive layer and the black matrix are disposed on the same side of the first substrate, and the color resistance layer, the transparent conductive layer and the black matrix are disposed on the same layer.
Optionally, the pixel regions are arranged in an array, the transparent conductive layer includes a first sub-portion and a second sub-portion, and an orthogonal projection of the first sub-portion on the first substrate is located between orthogonal projections of the color resistance layers on the first substrate, which are arbitrarily adjacent in a row direction of the array; the orthographic projection of the second sub-portions on the first substrate is positioned between the orthographic projections of any adjacent color resistance layers on the first substrate along the column direction of the array.
Optionally, the first sub-portion, the color resistance layer and the black matrix are disposed on the same side of the first substrate, and the first sub-portion, the color resistance layer and the black matrix are disposed in the same layer; the second sub-portion is arranged on one side of the first sub-portion, the color resistance layer and the black matrix, which is far away from the first substrate, and an insulating layer is arranged between the second sub-portion and the first sub-portion, the color resistance layer and the black matrix.
Optionally, the first sub-portion, the color resistance layer and the black matrix are disposed on the same side of the first substrate, and the first sub-portion, the color resistance layer and the black matrix are disposed in the same layer; the second sub-portion is arranged on one side of the first substrate, which is far away from the first sub-portion, the color resistance layer and the black matrix.
The invention also provides a display panel, which comprises the color film substrate, an array substrate, a backlight module and an optical fingerprint identification layer, wherein the array substrate and the color film substrate are arranged in a box-to-box manner, and liquid crystals are filled in a closing gap; the backlight module is arranged on one side of the array substrate, which is far away from the color film substrate; the optical fingerprint identification layer is arranged between the array substrate and the backlight module;
the display panel further comprises a first polaroid and a second polaroid, wherein the first polaroid is arranged on the color film substrate, and the second polaroid is arranged on the array substrate; and the polarization directions of the first polarizer and the second polarizer are mutually vertical.
Optionally, the first polarizer is located on one side of the color film substrate, which is away from the array substrate; or the first polarizer is positioned on one side of the color film substrate close to the array substrate;
the second polarizer is positioned on one side of the array substrate close to the color film substrate; or the second polarizer is positioned on one side of the array substrate, which is deviated from the color film substrate.
The present invention further provides a driving method of the display panel, including: performing optical fingerprint identification driving and display driving of the display panel in a time-sharing manner;
when the display panel carries out optical fingerprint identification, a set voltage is applied to the transparent conducting layer in the color film substrate;
and when the display panel performs display driving, stopping applying voltage to the transparent conducting layer in the color film substrate.
The invention has the beneficial effects that: according to the color film substrate provided by the invention, the transparent conducting layer is arranged in the spacing area between the adjacent pixel areas, when optical fingerprint identification is carried out, the transparent conducting layer and the circuit wiring of the corresponding area on the opposite box substrate form an electric field by applying set voltage to the transparent conducting layer, so that the deflection of liquid crystal in the closing gap of the color film substrate and the opposite box substrate is controlled, the liquid crystal rotates under the action of the electric field formed between the transparent conducting layer and the circuit wiring of the corresponding area on the opposite box substrate, and the light reflected by the fingerprint can smoothly pass through the color film substrate to reach the optical fingerprint identification layer positioned below the opposite box substrate, so that the light reflected by the fingerprint can meet the requirement of fingerprint identification, and the optical fingerprint identification function of the liquid crystal display panel is completed.
According to the display panel provided by the invention, the color film substrate is adopted, so that the optical fingerprint identification function can be better realized, the functions of the display panel are improved, and the application range of the display panel is expanded.
Drawings
Fig. 1 is a schematic structural plan view of a color film substrate in embodiment 1 of the present invention;
fig. 2 is a schematic diagram illustrating a principle of optical fingerprint identification of a display panel on which the color filter substrate shown in fig. 1 is disposed;
fig. 3 is a schematic cross-sectional view of the color film substrate shown in fig. 1 along an AA cutting line;
fig. 4 is a schematic cross-sectional view of a color film substrate in embodiment 2 of the present invention;
fig. 5 is a schematic view of a manufacturing process of a color film substrate in embodiment 2 of the present invention;
fig. 6 is a schematic cross-sectional view of a color film substrate in embodiment 3 of the present invention;
fig. 7 is a schematic cross-sectional structural view of a display panel in embodiment 4 of the present invention;
fig. 8 is a schematic diagram of a driving process of the display panel in embodiment 4 of the invention.
Wherein the reference numerals are:
1. a first substrate; 2. a color resist layer; 3. a transparent conductive layer; 31. a first sub-section; 32. a second sub-section; 101. a pixel region; 102. a spacer region; 4. a black matrix; 5. a first polarizer; 6. a common electrode; 7. a color film substrate; 8. an array substrate; 9. a liquid crystal; 10. a second polarizer; 11. an optical fingerprint identification layer; 12. a pixel electrode; 13. a backlight module; 14. a second substrate; 15. an insulating layer.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the color film substrate, the display panel and the driving method thereof according to the present invention are further described in detail below with reference to the accompanying drawings and the detailed description.
Example 1
The present embodiment provides a color filter substrate, as shown in fig. 1, which includes a first substrate 1, a color resistance layer 2 disposed on the first substrate 1, the first substrate 1 includes a plurality of pixel regions 101 and a spacer region 102 located between adjacent pixel regions 101, the color resistance layer 2 is located in the pixel regions 101, and further includes a transparent conductive layer 3, the transparent conductive layer 3 is located in the spacer region 102, the transparent conductive layer 3 can apply a set voltage, and forms an electric field with a corresponding region of a box substrate to control liquid crystal deflection, so as to allow light to pass through.
As shown in fig. 2, the transparent conductive layer 3 applies a set voltage when performing optical fingerprint recognition on a display panel on which the color filter substrate 7 is located. When optical fingerprint identification is performed, a finger touches the color film substrate 7 side of the display panel, and a set voltage is applied to the transparent conductive layer 3, so that the transparent conductive layer 3 can form an electric field with circuit traces (the circuit traces have no electric signal passing during optical fingerprint identification and are equal to grounding) in a corresponding area on the array substrate 8, and the deflection of the liquid crystal 9 in the alignment gap between the color film substrate 7 and the array substrate 8 is controlled, so that the liquid crystal 9 rotates under the action of the electric field formed between the transparent conductive layer 3 and the circuit traces in the corresponding area on the array substrate 8, and the light reflected by the fingerprint can smoothly pass through the first polarizer 5 on the color film substrate 7, the transparent conductive layer 3 and the second polarizer 10 on the array substrate 8 to reach the optical fingerprint identification layer 11 below the array substrate 8, and further the light reflected by the fingerprint can meet the requirements of optical fingerprint identification, and finishing the optical fingerprint identification function of the liquid crystal display panel. When the display panel displays, that is, when the display panel does not perform optical fingerprint identification any more, the application of voltage to the transparent conductive layer 3 in the color filter substrate may be stopped, at this time, the liquid crystal 9 in the display panel located in the spacer 102 is not deflected any more, so that the reflected light of the fingerprint cannot reach the optical fingerprint identification layer 11 located below the array substrate 8 through the first polarizer 5 on the color filter substrate 7, the transparent conductive layer 3 and the second polarizer 10 on the array substrate 8, thereby enabling the transparent conductive layer 3 to perform a light shielding function (equivalent to a black matrix function), and further realizing normal display of the display panel, and a light leakage phenomenon does not occur in the spacer 102 during display.
Preferably, in this embodiment, the color filter substrate further includes a black matrix 4, the black matrix 4 is located in the spacer 102, and an orthogonal projection of the black matrix 4 on the first substrate 1 is located between an orthogonal projection of the transparent conductive layer 3 and an orthogonal projection of the color resist layer 2 on the first substrate 1. As shown in fig. 2, when a display panel on which the color filter substrate 7 is located displays, an electric field is formed between the common electrode 6 of the color filter substrate 7 located in the pixel region 101 and the pixel electrode 12 of the corresponding region of the array substrate 8, so that the liquid crystal 9 is deflected to realize display, at this time, the liquid crystal 9 in the corresponding region of the spacer 102 does not deflect due to no electric field, and light reflected by a fingerprint cannot reach the optical fingerprint spacer 11 located below the array substrate 8 through the first polarizer 5 and the transparent conductive layer 3 on the color filter substrate 7 and the second polarizer 10 on the array substrate 8, so that the spacer 102 is substantially opaque when the display panel displays, and light leakage of the spacer 102 when the liquid crystal display panel displays is avoided. However, in the area of the spacer 102 adjacent to the pixel area 101, the liquid crystal 9 is also partially deflected by the electric field between the common electrode 6 and the pixel electrode 12 of the peripheral pixel area 101, so that a light leakage phenomenon is generated during displaying.
In this embodiment, along any arrangement direction of the pixel region 101, the ratio of the widths of the black matrix 4 and the transparent conductive layer 3 in the spacer region 102 is 1:5 to 1: 4. With such an arrangement, the liquid crystal display panel can realize the optical fingerprint identification function while sufficiently preventing the light leakage phenomenon generated when the liquid crystal 9 is displayed under the influence of the electric field between the common electrode 6 and the pixel electrode 12 of the peripheral pixel region 101 in the region adjacent to the pixel region 101 of the spacer region 102.
In this embodiment, as shown in fig. 3, the color resist layer 2, the transparent conductive layer 3 and the black matrix 4 are disposed on the same side of the first substrate 1, and the color resist layer 2, the transparent conductive layer 3 and the black matrix 4 are disposed in the same layer. Since the color resist layer 2 and the black matrix 4 are not conductive, and the transparent conductive layer 3 applies the same set voltage at any position during optical fingerprint recognition, the color resist layer 2, the transparent conductive layer 3, and the black matrix 4 can be disposed in the same layer, and the three layers exert their functions independently without affecting each other.
In addition, the color filter substrate further comprises a common electrode 6, and the common electrode 6 is arranged on one side of the color resistance layer 2, which is far away from the first substrate 1. The orthographic projection of the common electrode 6 on the first substrate 1 covers at least the pixel region 101. The common electrode 6 applies a predetermined voltage to form an electric field with the pixel electrode when the liquid crystal display panel displays, and controls the deflection of the liquid crystal in the pixel region 101, thereby implementing the display of the liquid crystal display panel. The common electrode 6 may only cover the pixel region 101 (as shown in fig. 3), or may completely cover the entire first substrate. If the common electrode completely covers the first substrate, an insulating layer needs to be disposed between the common electrode and the transparent conductive layer.
The color film substrate may further include other conventional film layers, and since the improvement scheme in this embodiment is not directly related to the other conventional film layers, details are not described here.
Based on the structure of the color filter substrate, the present embodiment further provides a method for manufacturing a color filter substrate, including forming a color resist layer and a transparent conductive layer on the first substrate, where the color resist layer is formed in the pixel region, and the transparent conductive layer is formed in the spacer region.
Wherein the photoresist layer is formed by coating, exposing and developing. The transparent conductive layer is formed by using an indium tin oxide material through deposition, exposure, development and etching.
In addition, the black matrix, the first polarizer and the common electrode are formed by adopting the traditional preparation process, and the details are not repeated here.
Example 2
The present embodiment provides a color filter substrate, which is different from that in embodiment 1, as shown in fig. 4, a pixel region 101 is arranged in an array, a transparent conductive layer includes a first sub-portion 31 and a second sub-portion 32, an orthogonal projection of the first sub-portion 31 on a first substrate 1 is located between orthogonal projections of color resist layers 2 arbitrarily adjacent to each other along a row direction of the array on the first substrate 1; the orthographic projection of the second sub-portion 32 on the first substrate 1 is positioned between the orthographic projections of any adjacent color-resist layers 2 on the first substrate 1 in the column direction of the array.
The first sub-part 31, the color resistance layer 2 and the black matrix 4 are arranged on the same side of the first substrate 1, and the first sub-part 31, the color resistance layer 2 and the black matrix 4 are arranged in the same layer; the second sub-portion 32 is disposed on a side of the first sub-portion 31, the color resist layer 2 and the black matrix 4 facing away from the first substrate 1, and the insulating layer 15 is disposed between the second sub-portion 32 and the first sub-portion 31, the color resist layer 2 and the black matrix 4. Wherein, the second sub-portion 32 and the common electrode 6 are sequentially arranged away from the color resistance layer 2.
It should be noted that, since the voltages applied to the transparent conductive layer and the common electrode are not affected by each other due to the driving during the optical fingerprint identification and the display time sharing, the arrangement of the second sub-portion and the common electrode is not specifically limited, the common electrode and the second sub-portion may also be arranged away from the color resistance layer in sequence,
in this embodiment, the first sub-portion 31 and the second sub-portion 32 may apply the setting voltage through different signal leads.
Other structures of the color film substrate in this embodiment are the same as those in embodiment 1, and are not described herein again.
Based on the foregoing structure of the color filter substrate, this embodiment further provides a method for manufacturing the color filter substrate, which is different from the method in embodiment 1, and as shown in fig. 5, includes:
cleaning a first substrate;
coating, exposing and developing to form a black matrix;
etching to form a first sub-part;
forming a color resistance layer by coating, exposing and developing; wherein, the color resistance layers with different colors are respectively formed by one-time process;
etching the other insulating substrate to form a second sub-portion;
attaching the other prepared insulating substrate to the first substrate; when the black matrix is attached, the other insulating substrate is contacted with the black matrix, the color resistance layer and the first sub-portion through the insulating adhesive glue and is adhered together. The other insulating substrate and the insulating adhesive glue are used as the insulating layer in the embodiment.
Example 3
The present embodiment provides a color filter substrate, which is different from that of embodiment 2, as shown in fig. 6, the first sub-portion 31, the color resist layer 2 and the black matrix 4 are disposed on the same side of the first substrate 1, and the first sub-portion 31, the color resist layer 2 and the black matrix 4 are disposed on the same layer; the second sub-portion 32 is disposed on a side of the first substrate 1 away from the first sub-portion 31, the color resist layer 2 and the black matrix 4.
In this embodiment, the first sub-portion 31 and the second sub-portion 32 may apply the setting voltage through different signal leads.
Other structures of the color film substrate and the manufacturing method of the color film substrate in this embodiment are the same as those in embodiment 1, and are not described herein again.
Beneficial effects of examples 1-3: in the color film substrate provided in embodiments 1 to 3, the transparent conductive layer is disposed in the spacer between the adjacent pixel regions, and when performing optical fingerprint identification, a set voltage is applied to the transparent conductive layer, so that the transparent conductive layer can form an electric field with the circuit traces in the corresponding region on the opposing substrate, so as to control the deflection of the liquid crystal in the gap between the color film substrate and the opposing substrate, and the liquid crystal rotates under the action of the electric field formed between the transparent conductive layer and the circuit traces in the corresponding region on the opposing substrate, so that the light reflected by the fingerprint can smoothly pass through the color film substrate to reach the optical fingerprint identification layer located below the opposing substrate, and further the reflected light of the fingerprint can meet the requirement of fingerprint identification, thereby completing the optical fingerprint identification function of the liquid crystal display panel.
Example 4
The present embodiment provides a display panel, as shown in fig. 7, including the color filter substrate 7 in any one of embodiments 1 to 3, further including an array substrate 8, a backlight module 13, and an optical fingerprint identification layer 11, where the array substrate 8 and the color filter substrate 7 are set in an aligned manner, and a liquid crystal 9 is filled in an aligned gap; the backlight module 13 is arranged on one side of the array substrate 8, which is far away from the color film substrate 7; the optical fingerprint identification layer 11 is arranged between the array substrate 8 and the backlight module 13; the display panel further comprises a first polarizer 5 and a second polarizer 10, wherein the first polarizer 5 is arranged on the color film substrate 7, and the second polarizer 10 is arranged on the array substrate 8; and the polarization directions of the first polarizer 5 and the second polarizer 10 are perpendicular to each other.
The second polarizer 10 is perpendicular to the first polarizer 5 in polarization direction, and is used for implementing liquid crystal deflection display based on the polarized light principle of the display panel. This is the conventional principle of the liquid crystal display technology and will not be described in detail here.
In this embodiment, the first polarizer 5 is located on a side of the color filter substrate 7 away from the array substrate 8, and the second polarizer 10 is located on a side of the array substrate 8 away from the color filter substrate 5.
It should be noted that the first polarizer may also be located on one side of the color film substrate close to the array substrate; the second polarizer may also be located on one side of the array substrate close to the color film substrate. It is sufficient that the fingerprint reflection light passes through the first polarizer and the second polarizer.
In the display panel, when optical fingerprint identification is performed, a set voltage is applied to the transparent conductive layer 3 in the color film substrate 7, so that the transparent conductive layer 3 and circuit traces (no electric signal passes through the circuit traces during optical fingerprint identification, which is equivalent to grounding) in a corresponding area on the array substrate 8 can form an electric field, so as to control the deflection of the liquid crystal 9 in the alignment gap between the color film substrate 7 and the array substrate 8, so that the liquid crystal 9 rotates under the action of the electric field formed between the transparent conductive layer 3 and the circuit trace in the corresponding region on the array substrate 8, so that the light reflected by the fingerprint can smoothly pass through the first polarizer 5 on the color film substrate 7, the transparent conductive layer 3 and the second polarizer 10 on the array substrate 8 to reach the optical fingerprint identification layer 11 under the array substrate 8, and then make fingerprint reflection light can satisfy fingerprint identification's requirement, accomplish liquid crystal display panel's optics fingerprint identification function. When the display panel displays, that is, when the display panel does not perform optical fingerprint identification any more, the application of voltage to the transparent conductive layer 3 in the color filter substrate may be stopped, at this time, the liquid crystal 9 in the display panel located in the spacer 102 is not deflected any more, so that the reflected light of the fingerprint cannot reach the optical fingerprint identification layer 11 located below the array substrate 8 through the first polarizer 5 on the color filter substrate 7, the transparent conductive layer 3 and the second polarizer 10 on the array substrate 8, thereby enabling the transparent conductive layer 3 to perform a light shielding function (equivalent to a black matrix function), and further realizing normal display of the display panel, and a light leakage phenomenon does not occur in the spacer 102 during display.
Based on the above structure of the display panel, the present embodiment further provides a driving method of a display panel, including: carrying out optical fingerprint identification driving and display driving of the display panel in a time-sharing manner; when the display panel carries out optical fingerprint identification, a set voltage is applied to the transparent conducting layer in the color film substrate; and when the display panel performs display driving, stopping applying voltage to the transparent conducting layer in the color film substrate.
The specific process of the driving method of the display panel is as follows: as shown in figure 8 of the drawings,
the method comprises the steps of extinguishing a screen state → calling an optical fingerprint identification command by an optical fingerprint identification interface → applying a set voltage to a transparent conducting layer in a color film substrate, deflecting liquid crystals in a corresponding area of a display panel, performing optical rotation → enabling fingerprint reflection light to pass through a first polarizer and a second polarizer to reach an optical fingerprint identification layer → identifying fingerprint information by the optical fingerprint identification layer to perform fingerprint unlocking → unlocking starting, operating a display panel screen → stopping applying voltage to the transparent conducting layer, enabling liquid crystals in the corresponding area of the display panel not to deflect optically, enabling light rays emitted by a backlight module of the display panel not to be emitted through the first polarizer and the second polarizer, and enabling the transparent conducting layer to be equal to a black matrix → the display panel to normally display.
By adopting the color film substrate in any one of embodiments 1 to 3, the display panel can better realize the optical fingerprint identification function, thereby improving the function of the display panel and expanding the application range of the display panel.
The display panel provided by the invention can be any product or component with a display function, such as an LCD panel, an LCD television, a display, a mobile phone, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A color film substrate comprises a first substrate, a color resistance layer arranged on the first substrate, a transparent conducting layer and a second substrate, wherein the first substrate comprises a plurality of pixel regions and a spacing region located between the adjacent pixel regions, the color resistance layer is located in the pixel regions, the transparent conducting layer is located in the spacing region, the transparent conducting layer can apply set voltage, and an electric field is formed between the transparent conducting layer and a corresponding region of a box substrate to control liquid crystal deflection so that light can penetrate through the transparent conducting layer.
2. The color filter substrate according to claim 1, further comprising a black matrix, wherein the black matrix is located in the spacer, and an orthogonal projection of the black matrix on the first substrate is located between an orthogonal projection of the transparent conductive layer and an orthogonal projection of the color resist layer on the first substrate.
3. The color film substrate according to claim 2, wherein along any arrangement direction of the pixel regions, the ratio of the widths of the black matrix and the transparent conductive layer in the spacer region is in a range of 1:5 to 1: 4.
4. The color filter substrate according to claim 2, wherein the color resist layer, the transparent conductive layer and the black matrix are disposed on the same side of the first substrate, and the color resist layer, the transparent conductive layer and the black matrix are disposed on the same layer.
5. The color filter substrate according to claim 2, wherein the pixel regions are arranged in an array, the transparent conductive layer comprises a first sub-portion and a second sub-portion, and an orthogonal projection of the first sub-portion on the first substrate is located between orthogonal projections of the color resist layers which are arbitrarily adjacent to each other in a row direction of the array on the first substrate; the orthographic projection of the second sub-portions on the first substrate is positioned between the orthographic projections of any adjacent color resistance layers on the first substrate along the column direction of the array.
6. The color filter substrate according to claim 5, wherein the first sub-portion, the color resist layer and the black matrix are disposed on the same side of the first substrate, and the first sub-portion, the color resist layer and the black matrix are disposed in the same layer; the second sub-portion is arranged on one side of the first sub-portion, the color resistance layer and the black matrix, which is far away from the first substrate, and an insulating layer is arranged between the second sub-portion and the first sub-portion, the color resistance layer and the black matrix.
7. The color filter substrate according to claim 5, wherein the first sub-portion, the color resist layer and the black matrix are disposed on the same side of the first substrate, and the first sub-portion, the color resist layer and the black matrix are disposed in the same layer; the second sub-portion is arranged on one side of the first substrate, which is far away from the first sub-portion, the color resistance layer and the black matrix.
8. A display panel, comprising the color film substrate according to any one of claims 1 to 7, further comprising an array substrate, a backlight module and an optical fingerprint identification layer, wherein the array substrate and the color film substrate are arranged in a box-to-box manner, and liquid crystal is filled in a gap between the array substrate and the color film substrate; the backlight module is arranged on one side of the array substrate, which is far away from the color film substrate; the optical fingerprint identification layer is arranged between the array substrate and the backlight module;
the display panel further comprises a first polaroid and a second polaroid, wherein the first polaroid is arranged on the color film substrate, and the second polaroid is arranged on the array substrate; and the polarization directions of the first polarizer and the second polarizer are mutually vertical.
9. The display panel according to claim 8, wherein the first polarizer is located on a side of the color filter substrate facing away from the array substrate; or the first polarizer is positioned on one side of the color film substrate close to the array substrate;
the second polarizer is positioned on one side of the array substrate close to the color film substrate; or the second polarizer is positioned on one side of the array substrate, which is deviated from the color film substrate.
10. A driving method of the display panel according to any one of claims 8 to 9, comprising: performing optical fingerprint identification driving and display driving of the display panel in a time-sharing manner;
when the display panel carries out optical fingerprint identification, a set voltage is applied to the transparent conducting layer in the color film substrate;
and when the display panel performs display driving, stopping applying voltage to the transparent conducting layer in the color film substrate.
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| CN202010219725.5A CN111338122A (en) | 2020-03-25 | 2020-03-25 | Color film substrate, display panel and driving method thereof |
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