CN212391800U - Display device - Google Patents
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- CN212391800U CN212391800U CN202021170322.8U CN202021170322U CN212391800U CN 212391800 U CN212391800 U CN 212391800U CN 202021170322 U CN202021170322 U CN 202021170322U CN 212391800 U CN212391800 U CN 212391800U
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- light
- display device
- light emitting
- emitting elements
- light source
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- 239000010409 thin film Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 8
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- 239000000463 material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Images
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- Image Input (AREA)
- Liquid Crystal (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
A display device comprises a display panel, a light source module and a sensing module, wherein the light source module is arranged between the display panel and the sensing module. The light source module comprises a light source and a light guide plate, wherein the light source is arranged on one side of the light guide plate and comprises a plurality of first light-emitting elements and a plurality of second light-emitting elements, the first light-emitting elements emit visible light, and the second light-emitting elements emit infrared light.
Description
Technical Field
The utility model relates to a display device especially relates to a liquid crystal display device with fingerprint sensing module.
Background
With the advent of smart electronic products, portable display devices, such as: smart phones (smart phones), tablet PCs (tablet PCs), notebook PCs (laptop PCs), etc. have become essential tools in people's lives. With increasing functionality, private data, such as phone books, photos or personal identification information, is typically stored therein. Due to the demands for personal privacy and security and for protecting private data, the application of fingerprint sensing modules to portable display devices has been developed.
When the optical fingerprint sensing module is applied to a liquid crystal display panel, light reflected by a finger cannot penetrate through each layer of material in a light source module (such as a backlight module), so that the fingerprint sensing module cannot generate a clear fingerprint image. Therefore, how to improve the effect of fingerprint image detection is an important issue for application of fingerprint sensing technology.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved in the present invention is to provide a liquid crystal display device, which can prevent light reflected by a finger from penetrating through materials of each layer in a light source module (e.g., a backlight module) when an optical fingerprint sensing module is applied to the liquid crystal display panel, so that the fingerprint sensing module cannot generate a clear fingerprint image.
In order to solve the above technical problem, the utility model provides a display device, it includes a display panel, a light source module and a sensing module, wherein light source module sets up between display panel and sensing module. The light source module comprises a light source and a light guide plate, wherein the light source is arranged on one side of the light guide plate and comprises a plurality of first light-emitting elements and a plurality of second light-emitting elements, the first light-emitting elements emit visible light, and the second light-emitting elements emit infrared light.
According to one embodiment of the present invention, one of the plurality of second light emitting elements is disposed between two adjacent ones of the plurality of first light emitting elements.
According to one embodiment of the present invention, a plurality of the second light emitting elements and a part of the plurality of the first light emitting elements are alternately arranged.
According to one embodiment of the present invention, the light guide plate has a micro structure, wherein the micro structure is disposed on one side of the light guide plate corresponding to the sensing module.
According to one embodiment of the present invention, the microstructure includes a circular bump structure.
According to one embodiment of the present invention, the microstructure includes a groove structure.
According to one embodiment of the present invention, the light source module further includes a reflective sheet disposed between the light guide plate and the sensing module, and the reflective sheet reflects the infrared light of the second light emitting element in a direction penetrating through the display panel.
According to one embodiment of the present invention, the sensing module includes a collimating element and a sensing element, and the collimating element is disposed between the light guide plate and the sensing element.
According to one embodiment of the present invention, the sensing element includes a thin film transistor sensor.
According to one embodiment of the present invention, the light source module further includes a control circuit board electrically connected to the first light emitting element and the second light emitting element, and the control circuit board controls the first light emitting element and the second light emitting element respectively.
The utility model discloses in, liquid crystal display device utilizes infrared light sensing fingerprint, and the rete among the light source module can have high penetration rate to the infrared light, makes the rete among the light source module that can pass through finger-reflected light, and then lets the sensing module can receive light and sense out clear fingerprint image. In addition, the second light-emitting element for providing infrared light and the first light-emitting element for providing visible light can be integrated on the light bar of the light source module, so that a light source for arranging infrared light in a space in the display device is not required to be additionally used, and the volume of the display device can be further reduced.
Drawings
Fig. 1 is a schematic cross-sectional view of a display device according to the present invention.
Fig. 2 is a schematic top view of the light source and the light guide plate according to the present invention.
Fig. 3 is a block diagram of a display device according to the present invention.
Fig. 4 is a schematic cross-sectional view of a light guide plate according to an embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view of a light guide plate according to another embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view of a collimating element and a sensing element according to an embodiment of the present invention.
The reference numbers are as follows:
10 display device
100 display panel
102 light source module
104 sensing module
106 cover plate
108 light source
1080 first light-emitting element
1082 second light emitting element
110 light guide plate
1101 surface
112 light bar
114,132 control circuit board
116 microstructure
118 circular bump structure
120: groove structure
122 reflective sheet
124 optical film
126 frame
128 collimating element
1280 micro lens
1282 perforating
1283 light permeable component
1284 light-shielding layer
1286 light filtering layer
130 sensing element
1301 thin film transistor sensor
134 flexible printed circuit board
L1, L2, L3, L4, La, Lb
P is the pitch
P1 first part
P2 second part
S is distance
SR fingerprint induction area
W1, W2, W3, W4 width
X, Y, Z directions
Detailed Description
Referring to fig. 1 to 3, the display device 10 may include a display panel 100, a light source module 102 and a sensing module 104, wherein the light source module 102 is disposed between the display panel 100 and the sensing module 104 in a direction Z. The display panel 100 of the present embodiment may be, for example, a liquid crystal display panel. For example, the display panel 100 may include two substrates and a liquid crystal layer disposed between the two substrates. In addition, the display panel 100 may further include polarizers disposed at both sides of the display panel 100. In this embodiment, the display device 10 may further include a cover 106 disposed on the display panel 100, such that the display panel 100 is disposed between the cover 106 and the light source module 102 in the direction Z, but not limited thereto. The cover 106 may provide protection to the display panel 100, and the cover 106 may include a transparent material, such as glass, plastic, or a combination thereof.
The light source module 102 of the present embodiment may be, for example, a backlight module capable of providing light to the display panel 100, but is not limited thereto. As shown in fig. 1, the light source module 102 may include a light source 108 and a light guide plate 110, and the light source 108 is disposed on one side of the light guide plate 110 in a direction Y, wherein the direction Y in fig. 1 may be perpendicular to the direction Z. In other words, the light source module 102 of the present embodiment is an edge-lit (edge-lit) backlight module. Referring to fig. 1 and fig. 2, the cross-sectional structure of fig. 1 may correspond to the cross-sectional line a-a' of fig. 2. In the present embodiment, the light source 108 may include a plurality of first light emitting elements 1080 and a plurality of second light emitting elements 1082, and the first light emitting elements 1080 and the second light emitting elements 1082 may be disposed on a light bar (light bar) 112. The first light emitting element 1080 and the second light emitting element 1082 may comprise Light Emitting Diodes (LEDs) or other suitable light emitting elements. As shown in fig. 2, the light bar 112 may be, for example, an elongated device extending along a direction X. In the drawings, the direction Z may be perpendicular to the direction X and the direction Y, and the direction X may be perpendicular to the direction Y. As shown in fig. 2, the first light emitting element 1080 and the second light emitting element 1082 may be disposed on the light bar 112 adjacent to the light guide plate 110 along the direction X.
The first light emitting element 1080 and the second light emitting element 1082 may each emit light of different wavelengths. For example, the first light emitting element 1080 can emit a light L1, and the second light emitting element 1082 can emit a light L2, wherein the wavelength of the light L2 can be greater than the wavelength of the light L1. In the present embodiment, the light L1 emitted by the first light emitting element 1080 can be visible light, and the light L2 emitted by the second light emitting element 1082 can be infrared light. For example, the display panel 100 may display a picture by using the light L1, and the sensing module 104 may sense a fingerprint by using the light L2.
As shown in fig. 2, in the direction X, two adjacent first light-emitting elements 1080 are arranged with a pitch P, wherein the pitch P may be the sum of the width W1 of the first light-emitting elements 1080 and the distance S between the two adjacent first light-emitting elements 1080 (e.g., P ═ W1+ S). A portion of the first light emitting elements 1080 may correspond to a fingerprint sensing area SR in the direction Y. As shown in fig. 1, the fingerprint sensing area SR may be, for example, a space extending in the direction Z, which may correspond to an area where a finger is placed on a surface of the cover 106. Referring back to fig. 2, in the portion of the first light emitting elements 1080, at least one second light emitting element 1082 may be disposed within a pitch P of one first light emitting element 1080, or at least one second light emitting element 1082 may be disposed within a distance S between two adjacent first light emitting elements 1080. Thus, the second light emitting element 1082 can provide light L2 (e.g., infrared light) to the fingerprint sensing region SR, and the display device 10 can sense a fingerprint by using the light L2. The second light emitting element 1082 may have a width W2, and the width W2 may be smaller than the distance S between two adjacent first light emitting elements 1080. For example, as shown in fig. 2, one second light emitting element 1082 of the plurality of second light emitting elements 1082 may be disposed between two adjacent first light emitting elements 1080 in the direction X, or the second light emitting elements 1082 and the portion of the first light emitting elements 1080 may be alternately disposed in the direction X, but not limited thereto. In the present embodiment, the width W1 of the first light emitting element 1080 can be substantially the same as the width W2 of the second light emitting element 1082, but not limited thereto.
In the embodiment, the second light emitting element 1082 for providing the light L2 (e.g., infrared light) and the first light emitting element 1080 for providing the light L1 (e.g., visible light) are integrated with the light bar 112 of the light source module 102, so that an additional light source for providing infrared light in the space of the display device 10 is not required, and the volume of the display device 10 can be reduced.
As shown in fig. 3, the light source module 102 of the present embodiment may include a control circuit board 114, wherein a control circuit for controlling the first light emitting element 1080 and a control circuit for controlling the second light emitting element 1082 may be disposed in the control circuit board 114, and the control circuit board 114 may control the first light emitting element 1080 and the second light emitting element 1082 respectively and independently. In addition, the control circuit board 114 can also be used as a control circuit board of the display panel 100, for example, the control circuit board 114 can also include a circuit (not shown) related to touch sensing. The following will exemplify a method of independently controlling the first light emitting element 1080 and the second light emitting element 1082, respectively. When the display panel 100 is in the normal image display state, the control circuit board 114 can turn on the first light emitting element 1080 to emit visible light, so that the display panel 100 can display an image by using the light L1. When a touch detection element (not shown) in the display panel 100 senses that a finger touches the fingerprint sensing area SR of the cover 106, the control circuit board 114 may turn on the second light emitting element 1082 to emit infrared light, so as to sense a fingerprint by using the infrared light.
In addition, the second light emitting element 1082 for sensing a fingerprint and the first light emitting element 1080 for displaying are not separately disposed light source systems, and the circuit and the routing of the second light emitting element 1082 of the present embodiment may be integrated with the light source module 102 and/or the display panel 100, so as to reduce the complexity of the in-system integration of the display device 10.
Please refer to fig. 4, which is a schematic cross-sectional view of a light guide plate according to an embodiment of the present invention. The light guide plate 110 may include a material having high light transmittance, such as resin. The light guide plate 110 may have a microstructure 116, and the microstructure 116 may be disposed on a side of the light guide plate 110 corresponding to the sensing module 104. As shown in fig. 1 and fig. 4, the microstructures 116 may be disposed on a surface 1101 of the light guide plate 110 adjacent to the sensing module 104, for example. In some embodiments, microstructures 116 can include at least one rounded bump structure 118. As shown in fig. 4, a plurality of circular bump structures 118 may be disposed on the surface 1101 of the light guide plate 110, and the cross section of the circular bump structures 118 may have a semicircular shape, but is not limited thereto. For example, the second light emitting element 1082 can emit light L3 and light L4, wherein the light L3 and the light L4 can be infrared light and can generate total reflection in the light guide plate 110. However, the light L3 may be reflected and scattered by the circular bump structure 118 during multiple total reflections, so that the light L3 can instead proceed toward the finger. The infrared light emitted from the second light emitting element 1082 can be effectively guided to the finger (or the fingerprint sensing region SR of the cover 106 in fig. 1) by adjusting the position, size (such as area or volume), density, and the like of the micro-structures 116. On the other hand, the light-emitting efficiency of the light source module 102 can also be improved by disposing the microstructures 116 in the light guide plate 110. The above-mentioned effects of the microstructure 116 can also be applied to the visible light emitted by the first light-emitting element 1080.
Please refer to fig. 5, which is a schematic cross-sectional view of a light guide plate according to another embodiment of the present invention. Unlike the embodiment of fig. 4, in the embodiment of fig. 5, microstructure 116 may include a groove (V-cut) structure 120. As shown in fig. 5, a plurality of grooves in the groove structure 120 may be disposed on the surface 1101 of the light guide plate 110, and the cross section of the groove structure 120 may be, for example, serrated. Similar to the circular bump structure 118 in fig. 4, the light L3 may be reflected and scattered by the groove structure 120 during the multiple total reflections, so that the light L3 can instead proceed toward the finger (or the fingerprint sensing area SR of the cover 106 in fig. 1).
As shown in fig. 1, the light source module 102 may further include a reflective sheet 122, at least one optical film 124, and a frame 126. The frame 126 may be disposed on two sides of the light source module 102 in the direction X and/or the direction Y, such that the light source module 102 may be accommodated in the frame 126. The reflective sheet 122 and the optical film 124 may be disposed on both sides of the light guide plate 110 in the direction Z, wherein the reflective sheet 122 may be disposed between the light guide plate 110 and the sensing module 104, and the optical film 124 may be disposed between the light guide plate 110 and the display panel 100. The reflective sheet 122 may have a property of reflecting light, and the reflective sheet 122 may reflect the infrared light of the second light emitting element 1082 and/or the visible light of the first light emitting element 1080 in a direction (e.g., a direction from the light source module 102 to the display panel 100) that penetrates through the display panel 100. As shown in fig. 1, the light La may be visible light emitted from the first light emitting element 1080 or infrared light emitted from the second light emitting element 1082, and the light La may be guided to the finger (or the fingerprint sensing area SR of the cover 106) through the microstructures 116 and/or the reflective sheet 122 of the light guide plate 110. Optical film 124 may include a diffuser, a brightness enhancement film, or other sheet material capable of enhancing optical effects.
In addition, for example, the light rays Lb in fig. 1 may be infrared light reflected by a finger. In the embodiment, the reflective sheet 122 and the optical film 124 have high transmittance for infrared light, so that the light rays Lb reflected by the finger can pass through the reflective sheet 122 and the optical film 124, and the sensing module 104 can receive the light rays Lb and sense a clear fingerprint image. In some embodiments, the plurality of layers in the optical module 102 may have a high transmittance for infrared light, or the plurality of layers between the finger and the sensing module 104 may have a high transmittance for infrared light to improve the sensing effect of the sensing module 104, but not limited thereto.
In the present embodiment, the sensing module 104 may include a collimating element 128 and a sensing element 130, wherein the collimating element 128 may be disposed between the light guide plate 110 and the sensing element 130. In some embodiments, the collimating element 128 may be in the form of a film (film type) attached to the sensing element 130. Alternatively, the collimating element 128 may be fabricated directly on the sensing element 130. In addition, the reflective sheet 122 may be disposed between the light guide plate 110 and the collimating element 128. In the present embodiment, the sensing element 130 may include a plurality of Thin Film Transistor (TFT) sensors 1301 (shown in fig. 6). Compared to a complementary metal-oxide-semiconductor (CMOS) sensor, the sensing element 130 using the TFT sensor 1301 has a larger sensing area, thereby improving the practicability and convenience of fingerprint recognition.
In the embodiment, the sensing element 130 is disposed below the display panel 100 and the light source module 102, and the sensing element 130 of the sensing element 130 does not block the light provided by the light source module 102 to the display panel 100, so that the sensing element 130 of the sensing element 130 can be disposed below the display area of the display panel 100, thereby avoiding increasing the frame width of the display device 10 and avoiding a complicated light guide element. In addition, if the sensing element 130 is disposed between the display panel 100 and the light source module 102, the distance between the display panel 100 and the light source module 102 is increased, which results in a reduction in the quality of the display screen and an increase in the thickness of the display module. However, the present embodiment may avoid the above problem by disposing the sensing element 130 below the display panel 100 and the light source module 102.
Please refer to fig. 6, which is a schematic cross-sectional view of a collimating element and a sensing element according to an embodiment of the present invention. The collimating element 128 of this embodiment may include a plurality of microlenses 1280, a plurality of openings 1282, a light-transmissive element 1283, a light-shielding layer 1284, and a filter layer 1286. The opening 1282 may be disposed in the light-shielding layer 1284 and may penetrate the light-shielding layer 1284 along the direction Z. The openings 1282, the light-transmissive member 1283, and the light-shielding layer 1284 may be disposed between the microlenses 1280 and the sensing devices 130, and the light-filtering layer 1286 may be disposed between the openings 1282 (and/or the light-shielding layer 1284) and the sensing devices 130. As shown in fig. 6, the opening 1282 has a first portion P1 and a second portion P2, wherein the first portion P1 has a width W3, and the second portion P2 has a width W4, in this embodiment, the width W3 is greater than the width W4, and the opening 1282 is designed by the widths W3 and W4, and can be used to control the angle and intensity of light entering the TFT sensor 1301 below.
Referring to fig. 1 and 3, the sensing module 104 may further include a control circuit board 132 and a Flexible Printed Circuit (FPC) 134, wherein the sensing element 130 may be electrically connected to the control circuit board 132 through the FPC 134, and the sensing element 130 may drive or control the TFT sensor 1301 in the sensing element 130. In the embodiment, when the touch detection element (not shown) in the display panel 100 senses that a finger touches the fingerprint sensing area SR of the cover 106, the control circuit board 114 may turn on the second light emitting element 1082 to emit infrared light, and the control circuit board 132 may drive the sensing element 130 to sense the infrared light to generate a fingerprint image. In some embodiments, when the display device 10 is applied to a mobile phone, the control circuit board 114 and the control circuit board 132 may be both electrically connected to the main circuit board of the mobile phone, or the control circuit board 114 and the control circuit board 132 may be integrated with the main circuit board of the mobile phone.
To sum up, the utility model discloses in, liquid crystal display device utilizes infrared light sensing fingerprint, and the rete among the light source module can have high penetration rate to the infrared light, makes the rete among the light source module that can pass through finger-reflected light, and then lets the sensing module can receive light and sense out clear fingerprint image. In addition, the second light-emitting element for providing infrared light and the first light-emitting element for providing visible light can be integrated on the light bar of the light source module, so that a light source for arranging infrared light in a space in the display device is not required to be additionally used, and the volume of the display device can be further reduced. Moreover, the circuit and the wire of the second light-emitting element can be integrated into the circuit and the wire of the light source module and/or the display panel, so that the complexity of integration in a system of the display device can be reduced.
Claims (10)
1. A display device, comprising:
a display panel;
a light source module, including a light source and a light guide plate, wherein the light source is disposed at one side of the light guide plate, and the light source includes a plurality of first light emitting elements and a plurality of second light emitting elements, wherein the plurality of first light emitting elements emit a visible light, and the plurality of second light emitting elements emit an infrared light; and
and the light source module is arranged between the display panel and the sensing module.
2. The display device according to claim 1, wherein one of the plurality of the second light-emitting elements is provided between two adjacent ones of the plurality of the first light-emitting elements.
3. The display device according to claim 1, wherein a plurality of the second light-emitting elements and a part of the plurality of the first light-emitting elements are alternately arranged.
4. The display device according to claim 1, wherein the light guide plate has a microstructure, and the microstructure is disposed on a side of the light guide plate corresponding to the sensing module.
5. The display device of claim 4, wherein the microstructure comprises a rounded bump structure.
6. The display device of claim 4, wherein the microstructure comprises a groove structure.
7. The display device according to claim 1, wherein the light source module further comprises a reflective sheet disposed between the light guide plate and the sensing module, and the reflective sheet reflects the infrared light of the second light emitting elements in a direction penetrating the display panel.
8. The display device according to claim 1, wherein the sensor module comprises a collimating element and a sensor element, and the collimating element is disposed between the light guide plate and the sensor element.
9. The display device of claim 8, wherein the sensing element comprises a thin film transistor sensor.
10. The display device as claimed in claim 1, wherein the light source module further comprises a control circuit board electrically connected to the first light emitting element and the second light emitting element, and the control circuit board controls the first light emitting element and the second light emitting element respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202062956773P | 2020-01-03 | 2020-01-03 | |
| US62/956,773 | 2020-01-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212391800U true CN212391800U (en) | 2021-01-22 |
Family
ID=74094098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021170322.8U Expired - Fee Related CN212391800U (en) | 2020-01-03 | 2020-06-22 | Display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN212391800U (en) |
| TW (1) | TWM601851U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113377242A (en) * | 2021-06-22 | 2021-09-10 | 武汉华星光电技术有限公司 | Display module |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114764988A (en) * | 2021-01-11 | 2022-07-19 | 群创光电股份有限公司 | Backlight module and display device using same |
-
2020
- 2020-06-22 CN CN202021170322.8U patent/CN212391800U/en not_active Expired - Fee Related
- 2020-06-22 TW TW109207878U patent/TWM601851U/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113377242A (en) * | 2021-06-22 | 2021-09-10 | 武汉华星光电技术有限公司 | Display module |
| CN113377242B (en) * | 2021-06-22 | 2023-12-15 | 武汉华星光电技术有限公司 | Display module |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM601851U (en) | 2020-09-21 |
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