KR102587657B1 - Display apparatus including light receving pixel area - Google Patents

Abstract

One embodiment of the present invention is a display device including a plurality of display pixel areas and a plurality of light-receiving pixel areas in a display area where an image is displayed, a plurality of light-receiving pixel areas disposed on a thin film transistor array and corresponding to the plurality of display pixel areas. an electroluminescent element, a plurality of light-receiving elements disposed on the thin film transistor array and corresponding to the plurality of light-receiving pixel areas, disposed on a transparent film covering the plurality of electroluminescent elements and the plurality of light-receiving elements, and the plurality of light-receiving elements A display device is provided that includes a plurality of light-shielding patterns overlapping a light-receiving element, and an opening pattern penetrating each of the light-shielding patterns.

Description

Display device including light receiving pixel area {DISPLAY APPARATUS INCLUDING LIGHT RECEVING PIXEL AREA}

The present invention relates to a display apparatus having a plurality of light receiving pixel areas for a touch sensing function and/or a fingerprint sensing function.

Display devices are applied to various electronic devices such as TVs, mobile phones, laptops, and tablets. To this end, research is continuing to develop display devices that are thinner, lighter, and have lower power consumption.

These display devices include Liquid Crystal Display device (LCD), Plasma Display Panel device (PDP), Field Emission Display device (FED), and Electro-Wetting display device. Display device (EWD) and electro-luminescence display device (ELDD).

Generally, a display device includes a display panel (hereinafter referred to as “display panel” or “panel”) that emits light for displaying an image. A typical display panel includes a pair of substrates facing each other and a light emitting material or liquid crystal material disposed between the pair of substrates.

Meanwhile, for user convenience and expansion of application range, the display device may have a built-in sensor to detect touch. In this way, an input task can be performed by detecting the position where a touch on the display surface is input, so there is an advantage in that it can replace separate input devices such as a mouse and keyboard. In addition, methods for embedding a sensor for detecting touch include the add-on type, on-cell type, and in-cell type. The add-on method is a method of preparing a separate touch sensing panel including touch sensing sensors arranged in a matrix and attaching the separate touch sensing panel to the upper or lower part of the display panel. The on-cell method is a method of placing touch detection sensors on a light-emitting material or liquid crystal material between a pair of substrates of a display panel. The in-cell method is a method of integrating a plurality of display pixel areas, a thin film transistor array for driving the plurality of display pixel areas, and a touch detection sensor on a substrate. Here, the in-cell method has the advantage of minimizing the increase in the thickness of the display panel compared to the add-on method and the on-cell method.

Methods for detecting these touches include a method that detects the position where the resistance changes (hereinafter referred to as the "resistance method"), a method that detects the position where the capacitance changes (hereinafter referred to as the "capacitance method"), and There is a method for detecting the location where the light amount has changed (hereinafter referred to as an “optical method”).

In the case of the optical method, a touch or fingerprint pattern is recognized by detecting the difference in light reflectance according to the difference in refractive index at each location of the medium in contact with the panel surface. For example, internal light incident on an area not in contact with the skin is reflected with a high reflectivity and enters the light-receiving element corresponding to the area, and a large amount of internal light incident on the area in contact with the skin is transmitted or absorbed. Only a small amount of light is reflected and enters the light receiving element corresponding to the corresponding area. At this time, the difference in light amount is detected to recognize the fingerprint pattern or touch.

In the case of the optical method, not only signal light generated inside the panel but also noise light from outside the panel may be incident on the light receiving element. In this case, a method to improve the signal-to-noise ratio by increasing the ratio of signal light to noise light is needed. do.

The present invention is intended to provide a display device that can improve the signal-to-noise ratio in a display device including an in-cell type light receiving element.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

According to a first embodiment of the present invention, a thin film transistor array, a plurality of electroluminescent elements disposed on the thin film transistor array, a plurality of light receiving elements disposed on the thin film transistor array, the plurality of electroluminescent elements, and the plurality of electroluminescent elements. A display device is provided including a plurality of light-shielding patterns disposed on a transparent film covering the light-receiving elements and overlapping the plurality of light-receiving elements, and an opening pattern penetrating each of the light-shielding patterns.

Each light-shielding pattern has a wider width than each light-receiving element, and each light-shielding pattern includes a protruding area corresponding to an edge of each light-receiving pattern and protruding compared to each light-receiving element.

The display device may further include a transparent cover member disposed on the plurality of light blocking patterns. Here, each light-receiving element absorbs at least a portion of the light generated in an effective light-receiving area corresponding to each opening pattern on the upper surface of the transparent cover member.

Each of the opening patterns may be disposed in the protruding area of each of the light-shielding patterns.

Alternatively, each of the opening patterns may overlap at least a portion of each of the light receiving elements.

At least some of the light generated by the plurality of electroluminescent elements may be emitted to the outside through the upper surface of the transparent cover member. Additionally, some of the light emitted from the plurality of electroluminescent elements may be reflected from the upper surface of the transparent cover member in contact with a predetermined medium and may be incident on each light-receiving element.

Meanwhile, not only light generated inside the panel by the electroluminescent element, etc., but also light incident from outside the panel (hereinafter referred to as “external light”) may be incident on the light receiving element. At this time, if the panel has a relatively high refractive index compared to the external medium, it is theoretically possible for external light to be refracted at the incident surface and reach the light receiving element only at an angle less than the critical angle.

However, according to the first embodiment of the present invention, external light and noise light are blocked from entering each light-receiving element by the light-shielding pattern, while light passing through each aperture pattern is incident on each light-receiving element. It can be.

A display device according to embodiments of the present invention is disposed on a transparent film covering a plurality of electroluminescent elements and a plurality of light-receiving elements, a plurality of light-shielding patterns overlapping the plurality of light-receiving elements, and an opening pattern penetrating each light-receiving pattern. Includes.

Due to each light-shielding pattern overlapping with each light-receiving element, it is possible to minimize noise light from outside and/or inside the device being incident on each light-receiving element. Here, noise light refers to the remainder excluding signal light required for detection of touch and/or fingerprint.

The purpose of the aperture pattern is to maximize the signal to noise ratio by selectively selecting the angle of incidence of light entering the light receiving element. Accordingly, there is an effect of reducing optical noise when implementing functions such as fingerprint sensing and/or touch sensing.

In addition, by appropriately setting the shape and size of the effective light-receiving area determined by the aperture pattern, light-receiving element, and geometric structure of the transparent cover member, accuracy is obtained in securing the pattern of the object to be detected, such as a finger print pattern or finger contact area. can be increased.

In this way, by providing the light receiving elements in a structure in which a plurality of light receiving elements are arranged on the same substrate as a plurality of electroluminescent elements, that is, by providing the light receiving elements in an in-cell method, it is possible to obtain the effect of simplifying the overall structure by eliminating a separate sensor module. .

1 is a diagram showing a display device according to a first embodiment of the present invention.
FIG. 2 is a diagram showing an example of an equivalent circuit corresponding to the display pixel area of FIG. 1.
FIG. 3 is a diagram illustrating an example of an equivalent circuit corresponding to a portion of the light-receiving pixel area and the read-out driver of FIG. 1.
FIG. 4 is a diagram showing the arrangement of a plurality of display pixel areas, a plurality of light-receiving pixel areas, a plurality of light-shielding patterns, and a plurality of aperture patterns in the display area of FIG. 1.
FIG. 5 is a diagram illustrating an example of a cross section of a display panel corresponding to area AA′ of FIG. 4 .
FIG. 6 is a diagram showing area B of FIG. 5.
FIG. 7 is a diagram showing area B of FIG. 5 according to a second embodiment of the present invention.
FIG. 8 is a diagram showing area B of FIG. 5 according to a third embodiment of the present invention.
Figure 9 is a diagram showing area B of Figure 5 according to the fourth embodiment of the present invention.
FIG. 10 is a diagram showing the arrangement of a plurality of display pixel areas, a plurality of light-receiving pixel areas, a plurality of light-shielding patterns, and a plurality of aperture patterns according to a fifth embodiment of the present invention in the display area of FIG. 1.
FIG. 11 is a diagram illustrating an example of a cross section of a display panel corresponding to area CC' of FIG. 10.
FIG. 12 is a diagram showing an example of an energy band diagram corresponding to the electroluminescent device of FIG. 11.
FIG. 13 is a diagram showing an example of an energy band diagram corresponding to the auxiliary light emitting device of FIG. 11.
FIG. 14 is a diagram showing an example of an energy band diagram corresponding to the auxiliary light emitting device of FIG. 11 according to the sixth embodiment of the present invention.
FIG. 15 is a diagram illustrating an example of a cross section of a display panel corresponding to area CC' of FIG. 10 according to the seventh embodiment of the present invention.
FIG. 16 is a diagram showing another example of the auxiliary opening pattern of FIG. 15.
FIG. 17 is a diagram showing another example of the auxiliary light blocking pattern of FIG. 15.
FIG. 18 is a diagram illustrating an example of a cross section of the display panel corresponding to area AA' of FIG. 4 according to the eighth embodiment of the present invention.

The above-mentioned objects, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Hereinafter, a display device according to each embodiment of the present invention will be described in detail with reference to the attached drawings.

First, with reference to FIGS. 1 to 6, a display device according to a first embodiment of the present invention will be described.

1 is a diagram showing a display device according to a first embodiment of the present invention. FIG. 2 is a diagram showing an example of an equivalent circuit corresponding to the display pixel area of FIG. 1. FIG. 3 is a diagram illustrating an example of an equivalent circuit corresponding to a portion of the light-receiving pixel area and the read-out driver of FIG. 1.

FIG. 4 is a diagram showing the arrangement of a plurality of display pixel areas, a plurality of light-receiving pixel areas, a plurality of light-shielding patterns, and a plurality of aperture patterns in the display area of FIG. 1. FIG. 5 is a diagram illustrating an example of a cross section of a display panel corresponding to area A-A' in FIG. 4. FIG. 6 is a diagram showing area B of FIG. 5.

As shown in FIG. 1, the display device 10 according to the first embodiment of the present invention includes a display panel 11 including a display area on which an image is displayed, and a panel driver 12 that drives the display panel 11. , 13, 14, 15).

The display panel 11 includes a light emitting material or liquid crystal material disposed on a substrate. Additionally, the display area of the display panel 11 includes a thin film transistor array that drives a plurality of display pixel areas (DP) configured to display images. The thin film transistor array includes a plurality of thin film transistors corresponding to a plurality of display pixel areas (DP) and various signal lines.

In addition, the display area of the display panel 11 includes a plurality of display pixel areas (DP) and a plurality of light-receiving pixel areas (RP; light-receiving pixel areas) for optically detecting the shape of a fingerprint or the position of a touch. It is placed.

Accordingly, a plurality of display pixel areas DP and a plurality of light-receiving pixel areas RP are arranged in the display area of the display panel 11.

The display panel 11 includes a plurality of electroluminescent elements (ELD in FIG. 2; Electro-Luminescence Diode) corresponding to a plurality of display pixel areas (DP) and a plurality of light-receiving elements (ELD in FIG. 2) corresponding to a plurality of light-receiving pixel areas (RP). PD in FIG. 3) may be included.

These plurality of electroluminescent devices (ELD) and plurality of light receiving devices (PD) are disposed on a thin film transistor array (110 in FIG. 5).

The thin film transistor array 110 of the display panel 11 includes a gate line (GL) and a data line (DL) connected to a plurality of display pixel areas (DP), and a plurality of light-receiving pixel areas (RP). ) includes a ReadOut Line (ROL) connected to

Illustratively, each gate line GL may correspond to each horizontal line composed of display pixel areas arranged side by side in the horizontal direction among the plurality of display pixel areas DP. Each data line DL may correspond to a vertical line composed of display pixel areas arranged side by side in the vertical direction among the plurality of display pixel areas DP. Additionally, each readout line (ROL) may correspond to each light-receiving pixel area (RP). However, this is only an example, and depending on the driving method of the plurality of display pixel areas (DP) and the driving method of the plurality of light-receiving pixel areas (RP), the gate line (GL), data line (DL) and readout line ( The type and arrangement of signal lines, including ROL), may vary.

The panel drivers 12, 13, 14, and 15 include a gate driver 12 that drives the gate line GL, a data driver 13 that drives the data line DL, a gate driver 12, and a data driver 13. ) may include a timing controller 14 that controls the driving timing of the readout line (ROL) and a readout driver 15 that drives the readout line (ROL).

Exemplarily, the gate driver 12 sequentially supplies gate signals to the gate line GL based on the gate drive start signal and gate clock signal of the timing controller 14. At this time, the switching thin film transistor (ST in FIG. 2) in the display pixel area (DP) is turned on based on the gate signal.

The data driver 13 supplies the data signal of each display pixel area DP to each data line DL based on the data drive start signal and data clock signal of the timing controller 14.

The readout driver 15 reads out the detection signal corresponding to each light-receiving pixel area RP.

As shown in FIG. 2, each display pixel area (DP) includes an electroluminescent device (ELD) and a pixel circuit (DP_C; drive circuit part of Display Pixel) for supplying driving current to the electroluminescent device (ELD). do.

The pixel circuit (DP_C) includes a driving transistor (DT) disposed in series with the electroluminescent device (ELD) between the first driving power line (EVDD) and the second driving power line (EVSS). and a switching transistor (ST) disposed between the data line DL and a storage capacitor (Cst) disposed between the first node (n1) and the second node (n2). The first node (n1) is disposed between the gate electrode of the driving transistor (DT) and the switching transistor (ST), and the second node (n2) is disposed between the driving transistor (DT) and the electroluminescent device (ELD).

In this pixel circuit (DP_C), when the switching transistor (ST) is turned on based on the gate signal of the gate line (GL), it transmits the data signal of the data line (DL) to the first node (n1). The storage capacitor (Cst) is charged based on the data signal. At this time, the driving transistor (DT) is turned on based on the charging voltage of the storage capacitor (Cst), and the driving current by the turned-on driving transistor (DT) is supplied to the electroluminescent device (ELD).

However, this is only an example, and the pixel circuit (DP_C) may be structured to further include a compensation circuit that compensates for the threshold voltage deviation (ΔVth) of the driving transistor (DT).

However, this is only an example, and the pixel circuit DP_C may be implemented with at least one transistor selected from the group consisting of an NMOS transistor, a PMOS transistor, and/or a CMOS transistor.

As shown in FIG. 3, each light-receiving pixel area (RP) includes a light-receiving element (PD; PIN Diode). Additionally, each light-receiving pixel region (RP) may further include a light receiving capacitor (R_C) connected in parallel to the light-receiving element (PD). Here, the light receiving capacitor (R_C) may be formed as a parasitic capacitor of the light receiving element (PD).

The light receiving element (PD) is connected between the bias power line (Vbias) and the read out line (ROL). For example, when light is incident on the light receiving device PD, an electron-hole pair is generated in response to the light incident at the P-I-N junction of the light receiving device PD. At this time, the electrons of the electron-hole pair move based on the bias power source (Vbias), thereby generating a detection signal corresponding to the amount of light incident on the light receiving element (PD).

The readout driver 15 includes a data detection unit 15a corresponding to each readout line (ROL) and a detection image signal generator 15b that generates a detection image signal based on the output of the data detection unit 15a. .

The data detection unit 15a includes an amplifier (AMP) corresponding to each readout line (ROL), a readout switch (SWro) disposed between the readout line (ROL) and the amplifier (AMP), and an amplifier (AMP). ), a feedback capacitor (Cf; Feedback Capacitor) and a feedback reset switch (SWre; Reset Switch), and an offset capacitor (Coff; Offset Capacitor) and a buffer capacitor (Cbuf; detection signal capacitor) corresponding to the output terminal of the amplifier (AMP). ), a first buffer switch (SWb1; 1 ^st Buffer Switch) disposed between the amplifier (AMP) and the offset capacitor (Coff), and a second buffer switch (SWb2) disposed between the amplifier (AMP) and the buffer capacitor (Cbuf). 2 ^nd Buffer Switch).

The first input terminal (-) of the amplifier (AMP) is connected to the readout line (ROL) through the readout switch (SWro). Accordingly, when the readout switch (SWro) is turned on, the detection signal corresponding to each light-receiving pixel area (RP) is input to the first input terminal (-) of the amplifier (AMP) through the readout line (ROL).

A predetermined reference signal (Vref) is input to the second input terminal (+) of the amplifier (AMP).

The feedback capacitor Cf is disposed between the first input terminal (-) and the output terminal of the amplifier (AMP). Accordingly, the gain between the first input terminal (-) and the output terminal of the amplifier (AMP) corresponds to the capacitance of the feedback capacitor (Cf).

The feedback reset switch (SWre) is arranged in parallel with the feedback capacitor (Cf) between the first input terminal (-) and the output terminal of the amplifier (AMP). This feedback reset switch (SWre) is for detecting an offset signal corresponding to noise of the amplifier (AMP).

That is, when the read switch (SWro) is turned off and the feedback reset switch (SWre) and the first buffer switch (SWb1) are turned on, the offset capacitor (Coff) responds to the offset signal corresponding to the noise of the amplifier (AMP). It is charged based on This process may be performed in the data detection unit 15a corresponding to the entire readout line (ROL) during an initialization period that operates before the start of each sensing cycle.

When the read switch (SWro) is turned on, the detection signal of each light-receiving pixel area (RP) is input to the first input terminal (-) of the amplifier (AMP), and the amplified detection signal is output from the output terminal of the amplifier (AMP). do. And, when the second buffer switch (SWb2) is turned on, the buffer capacitor (Cbuf) is charged based on the amplified detection signal.

The detection image signal generating unit 15b is connected to the offset capacitor Coff and the buffer capacitor Cbuf, and generates a detection image signal based on the offset signal and the amplified detection signal output from each data detection unit 15a. Illustratively, the detection image signal generation unit 15b generates a luminance level signal corresponding to the amount of light incident on each light-receiving pixel area RP based on the offset signal and the amplified detection signal output from each data detection unit 15a. , and a detection image signal can be generated from a combination of a plurality of luminance level signals corresponding to a plurality of light-receiving pixel areas (RP).

However, the data detection unit 15a is an exemplary circuit diagram, and the present invention is not limited thereto. To elaborate, some embodiments of the present invention may be configured to include a data detection unit with various modifications so as to perform substantially the same function.

Meanwhile, as shown in FIG. 4, the display panel 11 includes a plurality of display pixel areas (DP) and a plurality of light-receiving pixel areas (RP) arranged in a matrix in a display area where an image is displayed. In addition, the display panel 11 includes a plurality of light shield patterns (LS) overlapping on a plurality of light receiving elements (PD) corresponding to a plurality of light receiving pixel regions (RP) and disposed in each light shielding pattern (LS). It further includes an opening pattern (OP).

The plurality of display pixel areas (DP) include a red display pixel area (DP_R; Red Display Pixel) that emits red light, a green display pixel area (DP_G; Green Display Pixel) that emits green light, and a blue display pixel area (DP_R) that emits blue light. DP_B; Blue Display Pixel) may be included.

At this time, the electroluminescent device (ELD in FIG. 2) corresponding to each display pixel area DP may be a device that emits any one of red, green, and blue colors.

That is, the electro-luminescence layer of the electroluminescent device (ELD in FIG. 2) corresponding to the red display pixel region DP_R may include a dopant or host corresponding to red.

Likewise, the electroluminescent layer of the electroluminescent device (ELD in FIG. 2) corresponding to the green display pixel area (DP_G) may include a dopant or host corresponding to green.

And, the electroluminescent layer of the electroluminescent device (ELD in FIG. 2) corresponding to the blue display pixel area (DP_B) may include a dopant or host corresponding to blue.

Alternatively, a plurality of electroluminescent devices (ELDs in FIG. 2) corresponding to a plurality of display pixel areas DP may be devices that emit white light. In this case, the display panel 11 may further include a color filter corresponding to each display pixel area DP.

That is, the display panel 11 includes a red color filter corresponding to the red display pixel area (DP_R), a green color filter corresponding to the green display pixel area (DP_G), and a blue color filter corresponding to the blue display pixel area (DP_B). More may be included.

Each light-receiving pixel area (RP) is arranged between two neighboring display pixel areas (DP).

Additionally, the plurality of light-receiving pixel areas RP may be arranged alternately with at least one display pixel area DP arranged side by side in a specific direction among the plurality of display pixel areas DP. That is, at least one display pixel area (DP) and one light-receiving pixel area (RP) may be alternately arranged in any one of the horizontal, vertical, and diagonal directions.

For example, as shown in FIG. 4, one display pixel area (DP) and one light-receiving pixel area (RP) may be alternately arranged in the horizontal and vertical directions.

However, this is only an example, and each light-receiving pixel area (RP) may be arranged between at least one display pixel area (DP) in the horizontal, vertical, and diagonal directions.

However, this is only an example, and one display pixel area (DP) and one light-receiving pixel area (RP) may be alternately arranged in the diagonal direction.

Depending on the detection target, the arrangement spacing of the light-receiving pixel area (RP) can be adjusted. For example, in order to implement a fingerprint detection function, the arrangement spacing of the light-receiving pixel area (RP) may be smaller than the ridge spacing of the fingerprint. For example, the resolution of the light-receiving pixel area (RP) may be 300 dpi (dots per inch) or more, particularly 400 dpi or more.

Referring to FIG. 5, the display panel 11 includes a substrate 101, a thin film transistor array 110 disposed on the substrate 101, an element array 120 disposed on the thin film transistor array 110, and an element. It includes a light blocking pattern (LS) and an opening pattern (OP) disposed on the array 120.

The thin film transistor array 110 includes a plurality of thin film transistors (ST, DT in FIG. 2) corresponding to a plurality of display pixel areas (DP in FIG. 1).

When the plurality of light-receiving pixel areas (RP in FIG. 1) are driven in an active matrix method, the thin film transistor array 110 may further include a plurality of thin film transistors corresponding to the plurality of light-receiving pixel areas (RP). That is, the thin film transistor array 110 may further include signal lines and thin film transistors that drive a plurality of light-receiving pixel regions (RP).

The device array 120 includes a plurality of electroluminescent elements (ELD) corresponding to a plurality of display pixel areas (DP in FIG. 1) and a plurality of light receiving elements (PD) corresponding to a plurality of light receiving pixel areas (RP in FIG. 1). Includes.

A transparent film 121 is disposed on the plurality of electroluminescent devices (ELD) and the plurality of light receiving devices (PD).

A plurality of light-shielding patterns (LS) overlapping a plurality of light-receiving elements (PD) are disposed on the transparent film 121. Each light-shielding pattern LS is arranged to block at least one light-receiving element PD.

The plurality of light-shielding patterns LS are wide enough to block unnecessary light that may be incident on the plurality of light-receiving elements PD. That is, each light-shielding pattern (LS) corresponding to each light-receiving element (PD) has an area larger than that of each light-receiving element (PD). Accordingly, when viewed from above, each light receiving element PD is completely covered by each light blocking pattern LS.

The opening pattern OP penetrates a portion of each light-shielding pattern LS. That is, the opening pattern OP is formed by removing part of each light-shielding pattern LS. The opening pattern OP corresponds to a portion of each light blocking pattern LS removed by patterning. This opening pattern (OP) serves to select light at a specific incident angle to be incident on each light receiving element (PD). At least a portion of the light (Light_12) passing through the opening pattern (OP) is incident on the light receiving element (PD).

When the shape of the opening pattern (OP) is circular, there is an effect of reducing the occurrence of diffraction when light passes through the opening (OP). If diffraction occurs, sensing sensitivity may be reduced. However, the present invention is not limited to the shape of the opening pattern OP.

A transparent cover member 102 is disposed on the plurality of light blocking patterns LS. The transparent cover member 102 may include a material capable of protecting the display panel 11, such as glass, reinforced glass, reinforced plastic, or the like.

Here, a protective film 122 may be further disposed between the plurality of light blocking patterns LS and the transparent cover member 102. However, the present invention is not limited thereto.

Some of the light emitted from the electroluminescent device (ELD) may be emitted to the outside through the upper surface of the transparent cover member 102. Some of the light emitted from the electroluminescent device (ELD) may be scattered or reflected from the upper surface of the transparent cover member 102 in contact with a predetermined medium toward the light receiving device PD, that is, into the inside of the panel.

At least a portion (Light_12) of the light (Light_11) inside the transparent cover member 102 is reflected in a direction toward the light receiving element (PD) at the interface between the upper surface of the transparent cover member 102 and air.

In particular, the amount of light (Light_12) reflected toward the light receiving element (PD) at each position on the upper surface of the transparent cover member 102 is determined by the medium (for example, air or skin, etc.) in contact with the upper surface of the transparent cover member 102. It is determined according to the refractive index. In other words, the amount of light (Light_12) reflected inside the panel may vary depending on whether or not a finger is touched.

Meanwhile, the fingerprint of the finger 20 consists of ridges with a specific pattern. Accordingly, when the finger 20 is in contact with the upper surface of the transparent cover member 102, the ridged portion 21 of the finger 20 is in contact with the upper surface of the transparent cover member 102, while the spaced portion between the ridges ( 22) does not contact the transparent cover member 102. That is, the upper surface of the transparent cover member 102 in the ridge portion 21 is in contact with the skin 20, while the upper surface of the transparent cover member 102 in the spaced portion between the ridges 22 is in contact with air. .

At this time, since the skin 20 has a different refractive index from air, the amount of light (Light_12) reflected in the area in contact with the ridge portion 21 on the upper surface of the transparent cover member 102 is the spaced portion between the ridges. It is different from the amount of light (Light_22) reflected in the area contacting (22).

To elaborate, most of the light in the area in contact with the ridge portion 21 may pass through the skin or be absorbed by the skin, and the remaining part may be reflected.

Accordingly, based on the difference in the amount of light (Light_12, Light_22) incident on each light receiving device (PD), the ridged portion 21 and the spaced portion 22 between the ridges of the fingerprint 20 can be detected.

As shown in FIG. 6, the display panel 11 includes a thin film transistor array 110 disposed on a substrate 101, disposed on the thin film transistor array 110, and corresponding to a plurality of display pixel areas DP. A plurality of electroluminescent devices (ELD), a plurality of light receiving devices (PD) disposed on the thin film transistor array 110 and corresponding to a plurality of light receiving pixel regions (RP), a plurality of electroluminescent devices (ELD) and a plurality of light receiving devices It is disposed on the transparent film 121 covering the device PD and includes a plurality of light-shielding patterns LS overlapping the plurality of light-receiving elements PD, and an opening pattern OP penetrating each light-shielding pattern LS. do.

Here, each light-shielding pattern (LS) has a width wider than each light-receiving element (PD).

That is, each light-shielding pattern LS includes a protruded area (PA) that corresponds to an edge of each light-shielding pattern LS and protrudes compared to each light-receiving element PD.

The opening pattern OP is disposed on at least a portion of each light-shielding pattern LS.

As an example, the opening pattern OP may be disposed in a portion of the protruding area PA of each light-shielding pattern LS.

Alternatively, the opening pattern OP may be arranged to overlap at least a portion of each light receiving element PD. That is, a portion of the opening pattern OP may overlap with each light-receiving element PD, and the remaining portion may overlap with the protruding area PA of each light-shielding pattern LS.

Each light receiving element (PD) is configured to detect light incident through an opening pattern (OP) formed in each light blocking pattern (LS).

The protruding area (PA) of each light-shielding pattern (LS) has a sufficient protruding length in all directions as needed to prevent light incident from the upper surface of the transparent cover member 102, that is, from the outside of the panel (hereinafter referred to as “external light”). Among the light generated inside the panel by a plurality of electroluminescent elements (LEDs), etc. (hereinafter referred to as "internal light"), the light reflected from areas other than the available light receiving area (ARA) is received. It is designed to minimize reaching the device (PD).

The set of points where the extension lines connecting the edge of the opening pattern (OP) and the edge of the light receiving element (PD) meet the upper surface of the transparent cover member 102 draws a closed curve based on the plane, and the area that can be created at this time is The area inside the largest closed curve is defined as the Available light Receiving Area (ARA). Figure 6 exemplarily shows a cross section of the effective light receiving area (ARA). Here, the effective light receiving area (ARA) can be set to an appropriate size and shape corresponding to the size and shape of the target pattern to be detected. For example, the effective light receiving area (ARA) for fingerprint detection and touch detection can be set to an appropriate size and shape by reflecting the period and size of each target pattern to be detected.

As an example, the effective light receiving area (ARA) corresponding to each light receiving element (PD) and each opening pattern (OP) is the distance (G1) between the upper surface of the transparent cover member 102 and the opening pattern (OP), the opening pattern (OP) It may correspond to the distance (G2) between OP) and the light receiving element (PD), the width (W_OP) of the opening pattern (OP), and the width (W_PD) of the light receiving element.

Among the lines connecting the edge of the light-shielding pattern (LS) and the edge of the light-receiving element (PD), the line at which the angle formed with the normal line of the upper surface of the transparent cover member 102 is the minimum is called the light-shielding pattern minimum effective incident path (D_LS). define. The angle (θ_LS) formed by the minimum effective incident path of the light blocking pattern and the normal line of the upper surface of the transparent cover member 102 may be set larger than a predetermined critical angle. Here, the predetermined critical angle corresponds to the transparent cover member 102 and the medium in contact with the upper surface of the transparent cover member 102. Exemplarily, the critical angle for the minimum effective incident angle of the light blocking pattern may be set based on the range of the incident angle selected as noise light or the range of incident angle selected as signal light. In this case, the signal-to-noise ratio related to external light can be improved by minimizing the incident of external light into the light receiving element (PD) by the light blocking pattern (LS). As the minimum effective incident angle of the light blocking pattern becomes smaller, noise light unnecessary for touch and/or fingerprint detection among internal light can be reduced from being incident on the light receiving element, and the signal-to-noise ratio related to noise light can be improved.

Among the lines connecting the edge of the opening pattern (OP) and the edge of the light receiving element (PD), the line at which the angle formed by the minimum angle with the normal line of the upper surface of the transparent cover member 102 is defined as the minimum effective incident path of the opening pattern (D_OP). do. The angle (θ_OP) formed by the minimum effective incidence path of the opening pattern (D_OP) with the normal line of the upper surface of the transparent cover member 102 (hereinafter referred to as “minimum effective incidence angle of the opening pattern”) is greater than a predetermined critical angle. Here, the predetermined critical angle corresponds to the refractive index of the transparent cover member 102 and the refractive index of the medium (eg, air) mainly in contact with the upper surface of the transparent cover member 102. And, the critical angle for the minimum effective incident angle (θ_OP) of the aperture pattern can be set based on the range of the incident angle corresponding to the signal light.

As an example, the critical angle for the minimum effective incidence angle (θ_OP) of the opening pattern may correspond to total reflection on the upper surface of the transparent cover member 102 that is in contact with the air. In this case, the signal light incident on the light receiving element PD can be limited to light totally reflected on the top surface of the transparent cover member 102, and thus the signal-to-noise ratio can be improved.

In other words, among the lines connecting the edge of the light-shielding pattern (LS) and the edge of the light-receiving element (PD), the line with the minimum angle with the normal line of the upper surface of the transparent cover member 102 is called the light-shielding pattern minimum effective incident path (D_LS). ) is defined as. If necessary, the angle formed by the minimum effective incident path (D_LS) of the light-shielding pattern with the normal line of the upper surface of the transparent cover member 102 (hereinafter referred to as the "minimum effective incidence angle of the light-shielding pattern") (θ_LS) is greater than a predetermined critical angle. You can. Here, the predetermined critical angle corresponds to the transparent cover member and the medium in contact with the upper surface of the transparent cover member.

For example, if the minimum effective incident angle (θ_LS) of the light blocking pattern is set to be the same as the critical angle, it is possible to minimize not only external light but also reflected light inside the panel below the critical angle from entering the light receiving element (PD). If the minimum effective incidence angle (θ_LS) of the light blocking pattern extends beyond the critical angle, unnecessary total internal reflection light traveling inside the panel can also be reduced from entering the light receiving element (PD), and the signal-to-noise ratio related to external light can be reduced as well as the internal The signal-to-noise ratio associated with noisy light can be improved.

If the outer angle of the light blocking pattern (LS) is sufficiently wider than the light receiving element (PD), the angular range of light reaching the light receiving element (PD) is the geometry of the aperture pattern (OP) and the geometry of the light receiving element (PD), and the two It is determined by the relative positions of the shapes. At this time, the minimum and maximum values of the angle formed by the line connecting the edge of the opening pattern (OP) and the edge of the light receiving element (PD) with the normal line of the upper surface of the transparent cover member 102 are respectively referred to as the 'minimum effective angle of incidence of the opening pattern' ( θ_OP) and ‘maximum effective incident angle of aperture pattern’. The set of points where the extension lines connecting the edge of the opening pattern (OP) and the edge of the light receiving element (PD) meet the upper surface of the transparent cover member 102 draws a closed curve, and the inside of the closed curve with the largest area that can be created at this time The area is defined as the effective light receiving area (ARA).

For example, when trying to use a part of the internal light traveling at an angle larger than the critical angle as signal light, the minimum effective incident angle of the shading pattern (θ_LS) is sufficiently larger than the critical angle and the minimum effective incident angle of the opening pattern (θ_OP) is larger than the critical angle. It can be set to be equal. When using this structure, 'external light traveling below the critical angle' and 'internal light traveling above the critical angle that does not contribute to the signal' are blocked by the light blocking pattern (LS) and reach the light receiving element (PD). can be minimized. On the other hand, the light that contributes to the signal among the lights traveling above the critical angle reaches the light receiving element (PD) through the aperture pattern (OP), thereby improving the signal-to-noise ratio.

As another example, if necessary, the arrangement of the aperture pattern (OP) in each light-shielding pattern (LS) can be set so that the critical angle is between the 'minimum effective incident angle of the aperture pattern' and the 'maximum effective incident angle of the aperture pattern'. When light emitted from an arbitrary light-emitting device reaches an arbitrary light-receiving device (PD), the amount of light reaching the corresponding light-receiving device (PD) is maximized when the incident angle of light is near the critical angle, so by setting an appropriate structure, The amount of light incident on the light receiving element can be maximized.

As another example, when trying to use a part of the internal light traveling at an angle smaller than the critical angle as signal light, a structure in which the maximum effective incident angle of the aperture pattern is smaller than the critical angle can be set. When setting up this structure, the ratio of internal light traveling at an angle smaller than the critical angle to internal light traveling at an angle greater than the critical angle can be increased.

The thin film transistor array 110 includes a driving transistor (DT) connected to an electroluminescent device (ELD) corresponding to each display pixel area (DP in FIG. 1).

By way of example, the driving transistor DT may have a top gate structure. That is, the driving transistor DT includes an active layer (ACT) disposed on the substrate 101, a gate insulating film 111 disposed on a portion of the active layer (ACT), and a gate electrode on the gate insulating film 111. It includes a source electrode (SE; Source Electrode) and a drain electrode (DE; Drain Electrode) disposed on the interlayer insulating film 112 covering the gate electrode (GE), the active layer (ACT), and the gate electrode (GE).

The gate electrode GE is connected to the switching transistor (ST in FIG. 2) and the storage capacitor (Cst in FIG. 2) through the first node (n1 in FIG. 2).

The active layer (ACT) includes a channel region that overlaps the gate electrode (GE), and a source region and a drain region disposed on both sides of the channel region. This active layer (ACT) may be made of an oxide semiconductor material or a silicon semiconductor material.

The source electrode SE is connected to the source region of the active layer ACT through a contact hole penetrating the interlayer insulating film 112.

Like the source electrode (SE), the drain electrode (DE) is connected to the drain region of the active layer (ACT) through a contact hole penetrating the interlayer insulating film 112.

One of the source electrode (SE) and drain electrode (DE) of the driving transistor (DT) (source electrode (SE) in FIG. 6) is connected to the first driving power line (EVDD in FIG. 2), and the other ( The drain electrode (DE) in FIG. 6 is connected to the electroluminescent device (ELD).

The source electrode (SE) and drain electrode (DE) of the driving transistor (DT) are covered with the buffer film 113.

The electroluminescent device (ELD) includes an anode electrode (AE_ELD) disposed on the buffer film 113 of the thin film transistor array 110, and an electroluminescent layer (EL; Electro-) disposed on the anode electrode (AE_ELD). It includes a luminescence layer and a cathode electrode (CE_ELD) disposed on the electroluminescence layer (EL).

The anode electrode (AE_ELD) corresponds to each display pixel area (DP) and is electrically connected to the driving transistor (DT) through a contact hole penetrating the buffer film 113.

The edge of the anode electrode (AE_ELD) is covered with a bank (BK) disposed on the buffer film 113 of the thin film transistor array 110.

To prevent carriers from crowding around the edge of the anode electrode (AE_ELD), the bank (BK) may be made of an insulating material.

The electroluminescent layer (EL) corresponds to each display pixel area (DP) and is made of an electroluminescent material. Electroluminescent materials may be organic or inorganic, and in the case of organic materials, they may be referred to as Organic Light Emitting Diodes (OLED), and in the case of inorganic materials, they may be referred to as Quantum-dot Light Emitting Diodes (QLED). . However, it is not limited to this.

For reference, as shown in FIG. 12, the electroluminescent layer (EL) has a structure in which HTL (Hole Transport Layer), EML (Emitting Layer), and ETL (Electron Transport Layer) are sequentially stacked. It can be included. Additionally, the electroluminescent layer (EL) may have a single-stack light-emitting structure or a multi-stack light-emitting structure.

HTL is placed adjacent to the anode electrode (AE_ELD), and ETL is placed adjacent to the cathode electrode (CE_ELD). In addition, the electroluminescent layer (EL) is a HIL (Hole Injection Layer) disposed between the HTL and the anode electrode (AE_ELD), or an EIL (Electron Injection Layer) disposed between the ETL and the cathode electrode (CE_ELD). It may further include. However, it is not limited to this.

The EML of the electroluminescent layer (EL) can emit light of a specific color by including a dopant or host of a color corresponding to each display pixel area (DP). Alternatively, when the display panel 11 includes a separate color filter, the electroluminescent layer (EL) may emit white light.

The cathode electrode (CE_ELD) corresponds to a plurality of display pixel areas (DP) adjacent to each other and may be arranged to cover the bank (BK) and the electroluminescent layer (EL).

The light receiving element (PD) includes an anode electrode (AE_PD) disposed on the buffer film 113 of the thin film transistor array 110, a PIN junction layer (PIN) disposed on the anode electrode (AE_PD), and a PIN junction layer (PIN). It includes a cathode electrode (CE_PD) disposed on the electrode.

In this light receiving device (PD), the anode electrode (AE_PD) is connected to the lead out line (ROL), and the cathode electrode (CE_PD) is electrically connected to the bias power (Vbias in FIG. 3).

Here, the readout line (ROL) may be disposed on the thin film transistor array 110. That is, the readout line (ROL), along with the source electrode (SE) and drain electrode (DE), may be disposed on the interlayer insulating film 112 and covered with the buffer film 113. In this case, the anode electrode (AE_PD) of the light receiving device (PD) may be electrically connected to the lead out line (ROL) through a contact hole penetrating the buffer film 113.

Alternatively, although not separately shown, the readout line (ROL) may be disposed on the buffer film 113 along with the anode electrode (AE_PD).

Alternatively, although not separately shown, the readout line (ROL) may be disposed on an insulating film that can be added between the interlayer insulating film 112 and the buffer film 113.

In addition, although not shown in detail, the connection line between the bias power source (Vbias) and the cathode electrode (CE_PD) may be disposed on the same layer as either the cathode electrode (CE_PD) or the lead out line (ROL).

At least a portion of these light receiving elements PD is covered with the bank BK.

Specifically, a plurality of light-receiving pixel areas (RP) are spaced apart from each other at an interval corresponding to at least one display pixel area (PD), and each light-receiving pixel area (RP) is located between two neighboring display pixel areas (PD). It is placed. That is, each light receiving element (PD) is disposed between two neighboring display pixel areas (PD). Accordingly, the bank BK, which covers the edge of the anode electrode AE_ELD of the electroluminescent device ELD, is arranged to further cover the light receiving device PD.

The transparent film 121 is disposed on the cathode electrode (CE_ELD) of the electroluminescent device (ELD) and covers the plurality of electroluminescent devices (ELD) and the plurality of light receiving devices (PD). Also, the transparent film 121 may be formed in a flat shape.

This transparent film 121 is made of a transparent material to minimize the loss of light emitted from the electroluminescent device (ELD) to the transparent cover member 102 and the loss of light incident from the transparent cover member 102 to the light receiving device (PD). It can be done with Additionally, the transparent film 121 may be made of a transparent insulating material to reduce electrical interference between devices.

The transparent film 121 may be a material having planarization properties. In addition, at least one encapsulating layer (Encap layer) may be further disposed on the upper or lower surface of the transparent film 121 to protect the plurality of electroluminescent devices (ELDs) from oxygen and/or moisture penetration. However, the present invention is not limited thereto.

A plurality of light-shielding patterns LS are disposed on the transparent film 121 and individually overlapped with a plurality of light-receiving elements PD corresponding to a plurality of light-receiving pixel regions RP.

Each light-shielding pattern (LS) has a width wider than each light-receiving element (PD). That is, each light-shielding pattern LS may include a protruding area PA that is disposed at an edge of each light-shielding pattern LS and protrudes compared to the edge of each light-receiving element PD.

Additionally, a portion of each light-shielding pattern LS penetrates into the opening pattern OP.

The transparent cover member 102 is disposed on a plurality of light blocking patterns LS. As an example, the transparent cover member 102 may be disposed on the protective film 122. That is, the protective film 122 may be disposed between the transparent cover member 102 and the plurality of light blocking patterns LS. In this case, the plurality of light blocking patterns LS are covered with a protective film 122 . The protective film 122 may have a flat shape or a flat shape corresponding to the curve of the bottom pattern.

Next, with reference to FIGS. 7 to 18, another embodiment of the present invention will be described.

FIG. 7 is a diagram showing area B of FIG. 5 according to a second embodiment of the present invention.

As shown in FIG. 7, the display panel 11a of the display device according to the second embodiment of the present invention has a light receiving hole (LRH) corresponding to each light receiving element PD and penetrating the bank BK. ) is the same as the first embodiment shown in FIGS. 1 to 6 except that it further includes, so redundant description will be omitted.

The light receiving hole LRH corresponds to at least a portion of the light receiving surface (the upper surface of the cathode electrode (CE_PD) of the light receiving device in FIG. 7) on which light is incident among each light receiving device PD.

By this light receiving hole (LRH), the light receiving surface of the light receiving element (PD) is in contact with the cathode electrode (CE_ELD) of the electroluminescent element.

Therefore, in the path where the light reflected from the upper surface of the transparent cover member 102 is incident on the light receiving element PD, the interface between the cathode electrode CE_ELD and the bank BK can be removed. As a result, there is an advantage that light loss due to the interface between the cathode electrode (CE_ELD) and the bank (BK) can be minimized in the light reflected from the upper surface of the transparent cover member 102 and incident on the light receiving element (PD). .

As shown in FIG. 6, according to the first embodiment of the present invention, the light receiving element PD is covered by the bank BK. Accordingly, in order to minimize the loss of light incident on the light receiving device PD, the bank BK is made of a transparent material.

On the other hand, as shown in FIG. 7, according to the second embodiment of the present invention, at least a portion of the light-receiving surface of the light-receiving element PD is not covered by the bank BK by the light-receiving hole LRH, but is instead covered with the light-receiving surface of the electroluminescent element PD. It is exposed to the cathode electrode (CE_ELD). Accordingly, the bank BK does not need to be made of a transparent material.

FIG. 8 is a diagram showing area B of FIG. 5 according to a third embodiment of the present invention.

As shown in FIG. 8, the display panel 11b of the display device according to the third embodiment of the present invention is similar to that shown in FIG. 7 except that it includes a bank BK' made of an opaque material rather than a transparent material. Since it is the same as the second embodiment, redundant description will be omitted.

As in the third embodiment, when the bank BK' is made of an opaque material, that is, a light-absorbing material, there is an advantage that interference between lights from neighboring electroluminescent devices (ELDs) can be reduced.

In particular, due to the opaque bank BK', the light emitted from the electroluminescent device (ELD) adjacent to the light receiving device (PD) is not reflected from the upper surface of the transparent cover member 102 and the light receiving device (PD) You may be blocked from joining the company right away.

As a result, signal-to-noise ratio reduction (SNR) caused by light from neighboring electroluminescent devices (ELDs) can be minimized. As a result, there is an advantage that the reliability of the detection signal of the light receiving device (PD) can be further improved. Additionally, if necessary, the size and shape of the effective light receiving area of the light receiving element can be easily changed by covering part of the light receiving element PD using the opaque bank BK'.

Meanwhile, according to the first, second and third embodiments of the present invention, due to the light blocking pattern LS, the light reflected from the effective light receiving area (ARA in FIG. 6) of the upper surface of the transparent cover member 102 (FIG. Light_12 of 6) is incident on the light receiving element (PD).

In addition, when the electroluminescent layer (EL) and the cathode electrode (CE_ELD) are disposed throughout the display area, the electroluminescent layer (EL) and cathode electrode (CE_ELD) of the electroluminescent device (ELD) are disposed on top of the light receiving device (PD). do. At this time, when the cathode electrode (CE_ELD) of the electroluminescent device (ELD) is made of a translucent metal material, the amount of light reflected by the cathode electrode (CE_ELD) of the electroluminescent device (ELD) among the light incident on the light receiving device (PD) This can be increased.

Accordingly, the fourth embodiment of the present invention provides a display device further including a light reception quantity improvement pattern for suppressing reflection of light at the incident surface of the light receiving element PD, that is, the light receiving area.

Figure 9 is a diagram showing area B of Figure 5 according to the fourth embodiment of the present invention.

As shown in FIG. 9, the display panel 11c of the display device according to the fourth embodiment of the present invention includes at least one light receiving element PD disposed on a portion corresponding to the light receiving hole LRH. Since it is the same as the third embodiment except that it further includes a pattern (LRP; Light Receiving Pattern), redundant description will be omitted below.

At least one light reception enhancement pattern (LRP) is disposed on at least a portion of the light reception element (PD).

This at least one light receiving pattern (LRP) may be formed together with the light receiving hole (LRH) during the patterning process of the bank (BK) for forming the light receiving hole (LRH). In this case, at least one light reception enhancement pattern (LRP) may be made of the same material as the bank (BK). However, this is only an example, and the present invention is not limited thereto.

Each light reception enhancement pattern (LRP) may have a polygonal column shape or a cylindrical shape, but is not limited to this shape. And, at least one light reception enhancement pattern (LRP) is spaced apart from each other.

As it includes at least one light reception enhancement pattern (LRP), the light incident on the light reception element PD may be scattered or diffusely reflected in the spaced area between the at least one light reception enhancement pattern (LRP). On the side of the light reception enhancement pattern (LRP), the thickness of the cathode electrode (ELD_CE) can be thinned, and through this, the light incident rate into the light receiving device (PD) can be increased. As a result, the light absorption rate of the light receiving device PD can be improved, and thus the photoelectric conversion efficiency of the light receiving device PD can be improved.

This at least one light reception enhancement pattern (LRP) may be formed together with the light reception hole (LRH) during the patterning process of the bank (BK) for forming the light reception hole (LRH). In this case, at least one light reception enhancement pattern (LRP) is made of the same material as the bank (BK), and a separate stacking process and patterning process for forming the at least one light reception enhancement pattern (LRP) are unnecessary, so at least one light reception enhancement pattern (LRP) is made of the same material. An increase in the complexity of the manufacturing process can be prevented by further providing a light reception enhancement pattern (LRP).

Meanwhile, according to the first, second, third and fourth embodiments of the present invention, a plurality of electroluminescent devices (ELD) corresponding to a plurality of display pixel areas (DP) emit predetermined light. Then, the light receiving element PD detects the light reflected from the upper surface of the transparent cover member 102 incident through the opening pattern OP of the light blocking pattern LS.

The amount of light emitted from at least one of the plurality of electroluminescent devices (ELDs) may be insufficient to be detected by the light receiving device (PD), or an auxiliary light source for sensing may be required for other reasons. Accordingly, the sixth, seventh, and eighth embodiments of the present invention provide a display device that further includes a separate auxiliary light source for touch detection or fingerprint detection in addition to a plurality of electroluminescent devices (ELD) for image display.

FIG. 10 is a diagram showing the arrangement of a plurality of display pixel areas, a plurality of light-receiving pixel areas, a plurality of light-shielding patterns, and a plurality of aperture patterns according to a fifth embodiment of the present invention in the display area of FIG. 1. FIG. 11 is a diagram illustrating an example of a cross section of a display panel corresponding to area C-C' of FIG. 10. FIG. 12 is a diagram showing an example of an energy band diagram corresponding to the electroluminescent device of FIG. 11. FIG. 13 is a diagram showing an example of an energy band diagram corresponding to the auxiliary light emitting device of FIG. 11.

FIG. 14 is a diagram showing an example of an energy band diagram corresponding to the auxiliary light emitting device of FIG. 11 according to the sixth embodiment of the present invention. FIG. 15 is a diagram illustrating an example of a cross section of a display panel corresponding to area C-C' of FIG. 10 according to the seventh embodiment of the present invention.

FIG. 16 is a diagram showing another example of the auxiliary opening pattern of FIG. 15.

FIG. 17 is a diagram showing another example of the auxiliary light blocking pattern of FIG. 15.

FIG. 18 is a diagram illustrating an example of a cross section of a display panel corresponding to area A-A' of FIG. 4 according to an eighth embodiment of the present invention.

As shown in FIG. 10, the display panel 11d of the display device according to the fifth embodiment of the present invention is arranged in a matrix in the display area with a plurality of display pixel areas DP and a plurality of light-receiving pixel areas RP. It further includes at least one supplementary pixel area (SEP; Supplementary Emitting Pixel area).

Like the light-receiving pixel area (RP), each auxiliary pixel area (SEP) may be arranged between two neighboring display pixel areas (DP).

In addition, at least one auxiliary pixel area (SEP) may be arranged alternately with at least one light-receiving pixel area (RP) arranged side by side in any one direction among the plurality of light-receiving pixel areas (RP).

As shown in FIG. 11, the display panel 11d of the display device according to the fifth embodiment includes at least one auxiliary light emitting element (SELD) corresponding to at least one auxiliary pixel area (SEP; Supplementary Emitting Pixel). Since it is substantially the same as the first, second, third and fourth embodiments except that it further includes a -Luminescence Diode), redundant description will be omitted below.

At least one auxiliary light emitting device (SELD) is disposed on the same layer as a plurality of electroluminescent devices (ELD) in an in-cell manner. That is, at least one auxiliary light emitting device (SELD) is disposed on the thin film transistor array 110.

Specifically, each auxiliary light emitting device (SELD) includes an auxiliary anode electrode (AE_SELD) disposed on the buffer film 113 of the thin film transistor array 110, and an auxiliary electroluminescent layer disposed on the auxiliary anode electrode (AE_SELD). (EL_SELD; Supplementary Electro-luminescenceLayer) and an auxiliary cathode electrode (CE_SELD) disposed on the auxiliary electroluminescence layer (EL_SELD).

Here, the bank (BK) further covers the edge of the auxiliary anode electrode (AE_SELD) along with the edge of the anode electrode (AE_ELD) of the electroluminescent device.

The auxiliary electroluminescent layer (EL_SELD) may be made of an organic material in the same way as the electroluminescent layer (EL) of the electroluminescent device (ELD).

And, like the electroluminescent layer (EL) of the electroluminescent device (ELD), the auxiliary electroluminescent layer (EL_SELD) may include a structure in which HTL, EML, and ETL are stacked.

Additionally, like the electroluminescent layer (EL) of an electroluminescent device (ELD), the auxiliary electroluminescent layer (EL_SELD) may have a single-stack light emitting structure or a multi-stack light emitting structure.

As shown in FIG. 12, the electroluminescent layer (EL) of the electroluminescent device (ELD) may include a structure in which HIL, HTL, EML, ETL, and EIL are stacked.

Holes injected into the HIL from the anode electrode (AE_ELD) of the electroluminescent device (ELD) move to the EML through HTL, and electrons injected into the EIL from the cathode electrode (CE_ELD) of the electroluminescent device (ELD) move to the EIL through the EIL. Go to Accordingly, light is emitted as the electron-hole pairs caused by the holes and electrons moved to the EML return to the ground state.

Here, the EML may include a dopant or host corresponding to the color to be emitted from each display pixel area (DP). That is, the EML of the electroluminescent layer (EL) of the electroluminescent device (ELD) corresponding to the red display pixel region (DP_R) includes a dopant or host corresponding to red, and the electroluminescence corresponding to the green display pixel region (DP_G). The EML of the electroluminescent layer (EL) of the device (ELD) includes a dopant or host corresponding to green, and the EML of the electroluminescent layer (EL) of the electroluminescent device (ELD) corresponding to the blue display pixel area (DP_B) is blue. It may include a dopant or host corresponding to .

Alternatively, when the display panel includes a separate color filter, the EML may include dopants or hosts corresponding to at least two different colors and emit white light.

Meanwhile, the auxiliary electroluminescent layer (EL_SELD) of the auxiliary light emitting device (SELD) is formed through the same process as the electroluminescent layer (EL) of the electroluminescent device (ELD), and is therefore the same as the electroluminescent layer (EL) of the electroluminescent device (ELD). It can be structured.

That is, as shown in FIG. 15, the auxiliary electroluminescent layer (EL_SELD) of the auxiliary light emitting device (SELD) may have a structure including HIL, HTL, EML, ETL, and EIL.

Here, the auxiliary electroluminescent layer (EL_SELD) of the auxiliary light emitting device (SELD) may include a dopant or host corresponding to at least one color among red, green, and blue. That is, the auxiliary electroluminescent layer (EL_SELD) may include a dopant or host corresponding to any one of red, green, and blue colors. As an example, the auxiliary light emitting device (SELD) may include a dopant or host of the same color as the neighboring electroluminescent device (ELD).

Alternatively, the auxiliary electroluminescent layer (EL_SELD) may include all dopants or hosts corresponding to red, green, and blue.

As described above, according to the fifth embodiment of the present invention, in addition to the plurality of electroluminescent devices (ELD), at least one auxiliary light emitting device (SELD) for increasing the amount of light incident on the light receiving device (PD) is further included. .

There is an advantage that the amount of light incident on the transparent cover member 102 from the element array 120, that is, the amount of light generated inside the panel 11d, can be increased by this auxiliary light emitting device (SELD). In addition, there is an advantage that the amount of light reflected from the upper surface of the transparent cover member 102 can be increased by the auxiliary light emitting device (SELD) selectively emitting light in a predetermined area.

Accordingly, regardless of the luminance of the electroluminescent device (ELD), the amount of light incident on the light receiving device (PD) can be maintained above a certain level. Therefore, there is an advantage that the reliability of the detection signal generation of each light receiving element (PD) can be improved.

Meanwhile, in order to prevent light from the auxiliary light emitting device (SELD) from interfering with light for image display, the light of the auxiliary light emitting device (SELD) may be infrared (IR).

However, the auxiliary light emitting device (SELD) is disposed in a limited area between neighboring electroluminescent devices (ELD). As such, there is a problem in that it is quite difficult to place an element that emits infrared light in an area of very narrow width.

Accordingly, the sixth embodiment of the present invention provides a display device including an auxiliary light emitting device (SELD) that can emit infrared light while being disposed in a narrow area.

FIG. 14 is a diagram showing an example of an energy band diagram corresponding to the auxiliary light emitting device of FIG. 11 according to the sixth embodiment of the present invention.

As shown in FIG. 14, according to the sixth embodiment of the present invention, the auxiliary electroluminescent layer (EL_SELD') of the auxiliary light emitting device (SELD) has EML, unlike the electroluminescent layer (EL) of the electroluminescent device (ELD). Since it is the same as the fifth embodiment shown in FIGS. 10, 11, 12, and 13 except that it is not included, duplicate description will be omitted below.

Since the auxiliary electroluminescent layer (EL_SELD') of the auxiliary light emitting device (SELD) according to the sixth embodiment of the present invention does not include EML, it includes a structure in which HTL and ETL are bonded.

In this way, by removing the EML corresponding to a specific color, a change in energy level may occur at the interface between HTL and ETL with a range smaller than the range of change in energy level corresponding to visible light. As a result, the auxiliary light emitting device (SELD) including the auxiliary electroluminescent layer (EL_SELD'), which does not contain EML and is composed of a structure in which HTL and ETL are bonded, is different from the electroluminescent device (ELD) including EML corresponding to visible light. Can emit infrared light.

Therefore, there is an advantage that the auxiliary light emitting device (SELD) disposed in a narrow area can be provided as a device that emits infrared light.

As shown in FIG. 15, the display panel 11e of the display device according to the seventh embodiment of the present invention includes at least one auxiliary light-shielding pattern (S_LS) overlapping at least one auxiliary light-emitting element (SELD) and each The fifth and sixth embodiments shown in FIGS. 10, 11, 12, 13, and 14, except that they further include an auxiliary opening pattern (S_OP) disposed in a portion of the auxiliary light blocking pattern (S_LS). Since it is the same as the example, redundant explanation will be omitted below.

The auxiliary light blocking pattern (S_LS) is disposed on the transparent film 121. Each auxiliary light-shielding pattern (S-LS) has an area larger than that of each auxiliary light-emitting element (SELD). That is, each auxiliary light blocking pattern (S-LS) includes a protruding area (PA) that protrudes compared to each auxiliary light emitting element (SELD).

The auxiliary opening pattern (S_OP) may be disposed in a portion of the protruding area (PA) of each auxiliary light-shielding pattern (S-LS). In this way, there is an advantage that the incident angle with respect to the upper surface of the transparent cover member 102 can be specified for the light that passes through the auxiliary opening pattern (S_OP) among the light emitted from the auxiliary light emitting device (SELD).

In particular, among the lines connecting the edge of each auxiliary light emitting device (SELD) and the edge of each auxiliary opening pattern (S_OP), the line with the minimum angle with the normal line of the upper surface of the transparent cover member 102 (hereinafter, auxiliary opening) The angle formed by the pattern minimum effective incidence path) with the normal line of the upper surface of the transparent cover member 102 may be set in a similar range to the minimum effective incidence angle (θ_OP) of the opening pattern corresponding to each light receiving element PD.

In this way, there is an advantage that the amount of noise light that cannot be incident on the light receiving device (PD) among the light emitted from each auxiliary light emitting device (SELD) can be reduced.

Alternatively, as shown in FIG. 16, each auxiliary opening pattern (S_OP) may overlap at least partially with each auxiliary light emitting device (SELD).

Alternatively, as shown in FIG. 17, each auxiliary light-emitting pattern (S_LS') has an area similar to that of each auxiliary light-emitting device (SELD), and may overlap at least partially with each auxiliary light-emitting device (SELD). In this case, the display panel does not include an auxiliary opening pattern disposed in each auxiliary light-shielding pattern (S_LS').

Meanwhile, unlike the fifth, sixth, and seventh embodiments of the present invention, the display device 10 further includes an auxiliary light source unit that supplies light for touch or fingerprint detection, and the auxiliary light source unit is a part of the display panel 11. It may be placed on one side of the substrate 101.

FIG. 18 is a diagram illustrating an example of a cross section of a display panel corresponding to area A-A' of FIG. 4 according to an eighth embodiment of the present invention.

As shown in FIG. 18, the display panel 11f according to the eighth embodiment of the present invention includes a flat light guide portion 103 disposed below the substrate 101 and a light guide portion 103 disposed on one side of the light guide portion 103. Except for further including the auxiliary light source unit 130, it is the same as the first, second, third, and fourth embodiments, so redundant description will be omitted below.

The light guide unit 103 guides the light emitted from the auxiliary light source unit 130 throughout the display area. The auxiliary light source unit 130 includes at least one light emitting element disposed on one side of the display area. The auxiliary light source unit 130 may include a plurality of light emitting elements arranged throughout the display area.

Additionally, the auxiliary light source unit 130 supplies light during the sensing period in which the plurality of light receiving elements PD are driven. As this auxiliary light source unit 130 is disposed on a different layer from the device array 120 including a plurality of electroluminescent devices (ELDs), it can easily supply light having a different emission direction and wavelength range from that of the electroluminescent devices (ELDs). You can.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of.

10: display device
11: Display panel
DP: Display pixel area
RP: light receiving element
101: substrate
102: Transparent cover member
110: Thin film transistor array
120: element array
ELD: Electroluminescent device
PD: light receiving element
20: Finger
21: Ridge part of the finger
22: Separated portion between ridges
θ _TIR : Critical angle of total reflection
BK: bank
121: transparent film
LS: Shading pattern
OP; opening pattern

Claims (21)

In a display device including a plurality of display pixel areas and a plurality of light-receiving pixel areas arranged in a display area where an image is displayed,
a thin film transistor array including a plurality of thin film transistors corresponding to the plurality of display pixel areas;
a plurality of electroluminescent elements disposed on the thin film transistor array and corresponding to the plurality of display pixel areas;
a plurality of light-receiving elements disposed on the thin film transistor array and corresponding to the plurality of light-receiving pixel areas;
a plurality of light-shielding patterns disposed on a transparent film covering the plurality of electroluminescent elements and the plurality of light-receiving elements and overlapping the plurality of light-receiving elements; and
Includes an opening pattern penetrating each of the light-shielding patterns,
The display device wherein the opening pattern is disposed on the transparent film between the light-receiving element and the electroluminescent element.
According to claim 1,
Each light-shielding pattern has a wider width than each light-receiving element,
A display device wherein each light-shielding pattern includes a protruding area corresponding to an edge of each light-shielding pattern and protruding compared to each light-receiving element.
According to claim 2,
A display device further comprising a transparent cover member disposed on the plurality of light blocking patterns.
According to claim 3,
A display device wherein each light-receiving element absorbs at least a portion of light generated in an effective light-receiving area corresponding to each aperture pattern on the upper surface of the transparent cover member.
According to claim 3,
A display device wherein each of the opening patterns is disposed in the protruding area of each of the light-shielding patterns.
According to claim 5,
Among the angles between the edges of each opening pattern and the lines connecting the edges of each light receiving element and the normal line of the upper surface of the transparent cover member, the minimum angle (minimum effective angle of incidence of the opening pattern) is greater than a predetermined critical angle,
The predetermined critical angle is a display device corresponding to a medium in contact with the upper surface of the transparent cover member and the transparent cover member.
According to claim 3,
The display device wherein the opening pattern overlaps at least a portion of each light receiving element.
According to claim 1,
Each electroluminescent device above is
a first electrode disposed on the thin film transistor array;
an electroluminescent layer disposed on the first electrode; and
It includes a second electrode disposed on the electroluminescent layer,
A display device further comprising a bank covering an edge of the first electrode of each electroluminescent element.
According to claim 8,
A display device in which the electroluminescent layer of each electroluminescent device has a single stack light emitting structure or a multi stack light emitting structure.
According to claim 8,
The plurality of light-receiving pixel areas are arranged alternately with at least one display pixel area arranged in parallel among the plurality of display pixel areas,
The bank further covers at least a portion of each light-receiving element.
According to claim 10,
A display device further comprising a light receiving hole corresponding to at least a portion of each light receiving element and penetrating the bank.
According to claim 11,
A display device further comprising at least one light reception intensity improvement pattern disposed on a portion of each light reception element corresponding to the light reception hole.
According to claim 12,
The display device wherein the at least one light reception intensity improvement pattern is made of the same material as the bank.
According to claim 8,
The bank is a display device made of a light-absorbing insulating material.
According to claim 8,
The bank is a display device made of a light-transmitting insulating material.
According to claim 8,
The display area further includes at least one auxiliary light-emitting element corresponding to at least one auxiliary pixel area arranged together with the plurality of display pixel areas and the plurality of light-receiving pixel areas,
Each of the auxiliary light emitting devices is
an auxiliary first electrode disposed on the thin film transistor array;
an auxiliary electroluminescent layer disposed on the auxiliary first electrode; and
It includes an auxiliary second electrode disposed on the auxiliary electroluminescent layer,
The bank further covers an edge of the auxiliary first electrode of each auxiliary light emitting device.
According to claim 16,
A display device in which the electroluminescent layer of each electroluminescent element includes a structure in which HTL, EML, and ETL are stacked.
According to claim 17,
A display device wherein the auxiliary electroluminescent layer of each auxiliary light emitting device includes a structure in which the HTL, the EML, and the ETL are stacked.
According to claim 17,
A display device in which the auxiliary electroluminescent layer of each auxiliary light emitting element includes a structure in which the HTL and the ETL are bonded, excluding the EML.
According to claim 1,
Each light receiving element is
a first electrode disposed on the thin film transistor array;
a PIN bonding layer disposed on the first electrode; and
A display device including a second electrode disposed on the PIN junction layer.
According to claim 1,
The transparent film includes an encapsulation layer that protects the plurality of electroluminescent elements.

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