KR20190006401A - Display Apparatus - Google Patents

Abstract

The present invention is to provide a display apparatus capable of suppressing increase in the total thickness of the display apparatus and increase in manufacturing costs. The display apparatus comprises: a plurality of gate lines arranged to cross each other on a substrate; and a display panel having a plurality of data lines, a plurality of gate lines, and a plurality of unit pixels connected to the data lines. Each of the unit pixels includes a plurality of light emitting elements. At least one of the light emitting elements is a light receiving element emitting light from the light emitting elements and receiving the light totally reflected by an object on a light exit surface of the display panel.

Description

[0001]

This specification relates to a display device.

According to the development of information and communication technology, various applications such as a notebook computer, a tablet PC, a smart phone, a personal digital assistant, an automated teller machine, (Information and Communication Based System) has been developed. These systems typically store many confidential data, such as business information and business secrets, as well as personal information related to personal privacy, so there is a need to enhance security to protect these data.

To this end, a method of enhancing security using an image sensor capable of recognizing the user's biometric information has been proposed. For example, a fingerprint sensor is known that can enhance security by performing registration or authentication of a system using a fingerprint of a user's finger. BACKGROUND ART [0002] A fingerprint sensor is an optical image sensor for detecting fingerprints of a user.

An optical image sensor uses an external light source such as an LED (Light Emitting Diode) to irradiate light, and the light reflected by the ridge of the fingerprint is transmitted through a CMOS (Complementary Metal Oxide Semiconductor) image sensor It is based on the principle of sensing. Optical fingerprint sensors require an external light source and an image sensor for scanning as they must be scanned using LEDs. The necessity of an external light source and an image sensor has caused a problem in that it is difficult to apply to an image display device due to an increase in the size and cost of the optical fingerprint sensor.

The present specification discloses a display device capable of suppressing an increase in the overall thickness of a display device, an increase in manufacturing cost, etc. and extracting a clear optical image by performing sensing such as fingerprint, touch, roughness and motion using some components of the display device And to provide a display device.

A display device according to a first aspect of the present invention includes a display panel including a plurality of gate lines and a plurality of data lines, gate lines, and a plurality of unit pixels connected to the data lines, do. Each of the plurality of unit pixels includes a plurality of light emitting elements. At least one of the plurality of light emitting elements is a light receiving element which emits light from the light emitting elements and receives the light totally reflected by the object on the light output surface of the display panel.

A display device according to a second aspect of the present invention includes a plurality of unit pixels connected to a plurality of gate lines and a plurality of data lines, gate lines, and data lines arranged on a substrate, And a display panel having an uppermost layer covering the unit pixels. Each of the plurality of unit pixels includes a plurality of light emitting elements and at least one light receiving element. The light receiving element is spaced a certain distance from the light emitting element to emit light from any one of the plurality of light emitting elements and to receive light totally reflected by the uppermost layer object.

A display device according to a third aspect of the present invention includes a display panel having a plurality of gate lines and a plurality of data lines on a substrate, gate lines and a plurality of unit pixels connected to the data lines. Each of the plurality of unit pixels includes a plurality of sub-pixels having a light emitting element, and at least one of the plurality of sub-pixels includes a light emitting element serving also as a light receiving element. A sub-pixel including a light-emitting element serving as a light-receiving element also includes a driving thin film transistor for controlling the amount of current flowing in the light-emitting element serving as a light-receiving element, a cell driving control section for setting a gate- And a switch thin film transistor which is turned off when turned on and turned on when the driving thin film transistor is turned off and the light emitting element serving as a light receiving element is emitted from the plurality of light emitting elements and totally reflected by the object on the light emitting surface of the display panel And receives light.

A display device according to a fourth aspect of the present invention is a display panel including a plurality of gate lines and a plurality of data lines arranged on a substrate and a plurality of unit pixels connected to gate lines and data lines, And an image sensing IC that senses the amount of light through a lead-out line connected to some unit pixels among a plurality of unit pixels. Each of the plurality of unit pixels includes a sub-pixel including a plurality of sub-pixels including a light-emitting element and a light-receiving element. The light receiving element receives the light emitted from the plurality of light emitting elements and totally reflected by the object on the light exit surface of the display panel and transmits the amount of light received through the switch thin film transistor controlled by the gate drive signal supplied to the gate line, To the sensing IC.

According to the display device of the present disclosure, by implementing an optical image sensor as a light emitting element in a display device without needing to separately configure an external light source and an image sensor for scanning, the sensing area is not limited, And an effect of suppressing an increase in cost can be obtained.

According to the display device of the present disclosure, a clear optical image can be obtained by disposing a light receiving element spaced a certain distance from the light emitting element to receive the total reflected light out of the light emitted from the light emitting element.

According to the display device according to the embodiments of the present invention, since the light-receiving element is constituted by a white light-emitting element, higher luminance can be obtained than when a light-receiving element is constituted by a red light emitting element, a green light emitting element, or a blue light emitting element. An effect of sensing an image of an object having a resolution can be obtained.

1 is a block diagram showing a display device according to a first embodiment of the present invention;
FIG. 2 is an equivalent circuit diagram showing one of the sub-pixels constituting each unit pixel of the display panel shown in FIG. 1;
FIG. 3 is a plan view showing a first example of one unit pixel of the display device shown in FIG. 1,
FIG. 4 is a plan view showing a second example of one unit pixel of the display device shown in FIG. 1,
5 is a block diagram showing a display device according to a second embodiment of the present invention;
FIG. 6 is a plan view showing a first example of one unit pixel of the display device shown in FIG. 5,
FIG. 7 is a plan view showing a second example of one unit pixel of the display device shown in FIG. 5,
8 is a block diagram showing a display device according to a third embodiment of the present invention;
Fig. 9A is an equivalent circuit diagram showing one unit pixel of the display device shown in Fig. 8, and is a circuit diagram for explaining a case where the light-receiving element serving as a light-emitting element operates as a light-
Fig. 9B is an equivalent circuit diagram showing one unit pixel of the display device shown in Fig. 8, and is a circuit diagram for explaining a case in which a light receiving element serving as a light emitting element operates as a light receiving element in image sensing;
10 is a block diagram showing a display device according to a fourth embodiment of the present invention;
Fig. 11A is an equivalent circuit diagram showing one unit pixel of the display device shown in Fig. 10, which is a circuit diagram for explaining the operation of a light emitting element constituting a unit pixel,
Fig. 11B is an equivalent circuit diagram showing one unit pixel of the display device shown in Fig. 10, which is a circuit diagram for explaining the operation of the light receiving element constituting a unit pixel,
12 is a view for explaining a distance setting between a light emitting element and a light receiving element for image sensing in a display device according to the first to fourth embodiments of the present invention.

Brief Description of the Drawings The advantages and features of the present disclosure, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the description is not limited to the embodiments disclosed herein but is to be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, To fully disclose the scope of the specification to those skilled in the art, and the specification is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like described in the drawings for describing the embodiments of the present invention are illustrative and are not limited to those shown in the present specification. Like reference numerals refer to like elements throughout the specification. In the following description of the present invention, a detailed description of known related arts will be omitted when it is determined that the gist of the present specification may be unnecessarily obscured. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

The first, second, etc. may be used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical concept of the present specification.

It is to be understood that each of the features of the various embodiments of the present disclosure may be combined or combined with each other, partially or wholly, and technically various interlocking and driving are possible, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, a display device according to embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, the display device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

FIG. 1 is a block diagram showing a display device according to an embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram showing one of the subpixels constituting each unit pixel of the display panel shown in FIG. 1 . FIG. 3 is a plan view schematically showing a first example of one unit pixel of the display device shown in FIG. 1, and FIG. 4 is a plan view showing a second example of one unit pixel of the display device shown in FIG.

1, a display device according to an embodiment of the present invention includes a data driving and image sensing circuit 12, a gate driving circuit 14, a timing controller 16, a switching unit SW, and a display panel DIS. .

The data driving and image sensing circuit 12 includes a data driving IC (D-IC) and an image sensing IC (S-IC).

The data driving IC (D-IC) converts the digital video data (RGB) input from the timing controller 16 to an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving IC D-IC is supplied to the pixels of the display panel DIS through the data lines D1 to Dm and the switching unit SW.

The image sensing IC S-IC responds to the image sensing enable signal SE by using the light receiving element of the selected display panel DIS to display image information of an object that is in proximity to or touches the display panel DIS Out lines RO1 to ROk. The object may be a part of a human body including biometric information such as a fingerprint of a finger having fingerprint information.

The gate driving circuit 14 sequentially supplies gate pulses synchronized with the data voltages to the gate lines G1 to Gn to select the pixels of the display panel DIS to which the data voltages are written.

The timing controller 16 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 19 And synchronizes the operation timings of the data driving IC (D-IC), the switching portion SW, and the gate driving circuit 14. The data timing control signal for controlling the data driving IC (D-IC) may include a source sampling clock (SSC), a source output enable (SOE) signal, and the like. The gate timing control signal for controlling the gate driving circuit 14 includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE . ≪ / RTI > The switching unit control signal for controlling the switching unit SW may include an image sensing enable signal SE and the like.

The pixel array of the display panel DIS includes a plurality of gate lines (G1 to Gn, n being a positive integer) and a plurality of data lines (D1 to Dm, m are positive integers) And a plurality of unit pixels P1, P2, ... (unit pixels) connected to the gate lines G1 to Gn and the plurality of data lines D1 to Dm. Each of the unit pixels P1, P2, ... includes a plurality of light emitting elements, and one of the plurality of light emitting elements has a function of a light receiving element. Alternatively, each of the unit pixels P1, P2, ... may include a plurality of light emitting elements and a light receiving element. In this specification, the light emitting elements and the light emitting element having the light receiving element function may include an organic light emitting diode (OLED). The display device according to the embodiment of the present invention can display image information of an object that is proximate to or touched to the display panel DIS by using the light receiving element of the display panel DIS, Device.

The switching unit SW includes a plurality of selection switches S1, S2, ... Sk. Each of the plurality of selection switches S1, S2, ..., Sk supplies data lines for supplying data voltages to the light emitting elements of the unit pixels P1, P2, ... to a data driving IC (D-IC) Or a data line for supplying the light energy sensed from the light receiving element to the image sensing IC (S-IC).

Hereinafter, referring to FIG. 2, sub-pixels constituting each unit pixel P1, P2, ... of the display panel DIS will be described. 2 is an equivalent circuit diagram showing one of the sub-pixels constituting each unit pixel (P1 or P2) of the display panel DIS shown in FIG.

Referring to FIG. 2, each unit pixel P1 or P2 of the display panel DIS includes a gate line GL and a data line DL, a gate line GL and a data line DL, And a sub-pixel to be disposed. Accordingly, the sub-pixels may be arranged in a matrix in the entire region of the display panel DIS, but the present invention is not limited thereto. The sub-pixel includes an organic light emitting diode (OLED), a driving thin film transistor (hereinafter referred to as a driving TFT) DT for controlling the amount of current I flowing through the organic light emitting diode OLED, a driving TFT And a cell drive control unit (CDC) for setting the gate-source voltage of the data driver DT.

The cell drive control unit CDC may include one switch TFT ST and one storage capacitor Cst. The switch TFT ST includes a gate electrode connected to the gate line G1, a first electrode connected to the data line D1, and a second electrode connected to the first node n1. The storage capacitor Cst includes a first electrode connected to the first node n1 and a second electrode connected to the high potential power supply line Vdd. The second electrode of the switch TFT (ST), the gate electrode of the driver TFT (DT), and the first electrode of the storage capacitor (Cst) are connected to the first node (n1). To the second node n2, a high potential power supply line Vdd, a second electrode of the storage capacitor Cst, and a first electrode of the driving TFT DT are connected.

The driving TFT DT includes a first electrode connected to the second node n2 connected to the high potential power supply line Vdd, a gate electrode connected to the first node n1, and a gate electrode connected to the organic light emitting diode OLED And a second electrode connected to the anode electrode.

The organic light emitting diode OLED is connected between the second electrode of the driving TFT DT and the low potential power supply line Vss.

FIG. 2 shows an example of a cell drive controller (CDC) including one switch TFT (ST) and one storage capacitor (Cst), but the present invention is not limited thereto. The cell drive control unit (CDC) may be configured to include a variety of switch TFTs and storage capacitors as needed.

2, an organic light emitting diode (OLED) included in each sub-pixel is a light emitting element. In the present specification, these organic light emitting diodes included in a unit pixel are used as a light emitting element or a sensing element of an optical image sensor . Therefore, in the following description, the organic light emitting diode will be referred to as a light emitting element or a light receiving element if necessary.

Hereinafter, a first example of the display device according to the first embodiment of the present invention will be described with reference to FIG.

Fig. 3 is a plan view showing a first example of one unit pixel of the display device shown in Fig. 1, and shows only the configuration of the switch TFT and the light emitting element of the cell drive control unit (CDC) shown in Fig.

3, one unit pixel includes a second green light emitting element (also referred to as a second green light emitting element) which also functions as a red light emitting element LE_R, a first green light emitting element LE_G1, a blue light emitting element LE_B, LE_G2).

In the example of FIG. 3, the red light emitting element LE_R, the first green light emitting element LE_G1, the blue light emitting element LE_B, and the second green light emitting element LE_G2 are arranged in two rows and two columns. Specifically, the red light emitting element LE_R is connected to the first gate line G1 and the first data line D1 through the switch TFT ST11, the first green light emitting element LE_G1 is connected to the switch TFT ST12, To the first gate line G1 and the second data line D2. And the second data line D2 is connected to the data driving IC (D-IC).

The blue light emitting element LE_B is connected to the second gate line G2 and the second data line D2 through the switch TFT ST22 and the second green light emitting element LE_G2 is connected to the switch TFT ST21 To the second gate line G2 and the first data line D1. The second green light emitting element LE_G2 which also functions as the red light emitting element LE_R and the light receiving element RE is connected to the data driving IC D-IC or the image sensing IC through the selection switch S1 of the switch SW. (S-IC).

The selection switch S1 of the switch section SW is connected to the data driving IC IC1 through the first data line D1 connected to the light receiving element RE in response to the image sensing enable signal SE supplied from the timing controller 16. [ D-IC) or an image sensing IC (S-IC). For example, the selection switch S1 of the switch SW operates in the display mode in the steady state, and the data voltage supplied from the data driving IC D-IC is supplied to the red light emitting element LE_R and the second green light emitting element LE- (For example, when a secret icon is clicked or a guidance window for payment is clicked) when information such as touch (or contact) or proximity is generated on the display panel DIS, The light emitting element LE_R emits light and the light receiving element RE is switched to the sensing mode to receive light. Accordingly, in the display mode, since the data voltage is supplied through the first and second data lines D1 and D2, the four light emitting devices LE_R, LE_G1, LE_G2, and LE_B emit light, The data line D1 connected to the light receiving element RE through the selection switch S1 of the switch part SW controlled by the image sensing enable signal SE is applied to the image sensing The image input to the light receiving element RE is supplied to the image sensing IC (S-IC) so that the image inputted according to the information can be recognized.

Next, a first example of the display device according to the first embodiment of the present invention will be described with reference to FIG.

Fig. 4 is a plan view showing a second example of one unit pixel of the display device shown in Fig. 1, and shows only the configuration of the switch TFT and the light emitting element of the cell drive control section (CDC) shown in Fig.

Referring to FIG. 4, one unit pixel includes a red light emitting element LE_R, a green light emitting element LE_G, a blue light emitting element LE_B, and a light receiving element RE.

In the example of FIG. 4, the red light emitting element LE_R, the green light emitting element LE_G, the blue light emitting element LE_B, and the white light emitting element LE_W are arranged in one row. Specifically, the red light emitting element LE_R is connected to the first gate line G1 and the first data line D1 through the switch TFT ST11, and the green light emitting element LE_G is connected to the first gate line G1 through the switch TFT ST12 And is connected to the first gate line G1 and the second data line D2. Further, the blue light emitting element LE_B is connected to the first gate line G1 and the third data line D3 through the switch TFT ST13. The first to third data lines D1 to D3 are connected to the data driving IC (D-IC). The white light emitting device LG_W, which also functions as the light receiving element RE, is connected to the fourth data line D4 through the switch TFT. The white light emitting element LG_W also serving as the light receiving element RE is selectively connected to the data driving IC D-IC or the image sensing IC S-IC via the selection switch S1 of the switch portion SW do.

The selection switch S1 of the switch section SW responds to the image sensing enable signal SE supplied from the timing controller 16 to the data driving IC IC1 through the fourth data line D4 connected to the light receiving element RE D-IC) or an image sensing IC (S-IC). For example, the selection switch S1 of the switch SW operates in the display mode in the steady state to supply the data voltage supplied from the data driving IC D-IC to the white light emitting element LE_W, (For example, when a secret icon is clicked or when a guide window for payment is clicked, but not limited to this), the light receiving element RE may be a sensing Mode and received. Accordingly, in the display mode, since the data voltage is supplied through the first to fourth data lines D1 to D4, the four light emitting devices LE_R, LE_G, LE_B, and LE_W emit light, And the data line D1 connected to the light receiving element RE via the selection switch S1 of the switch part SW controlled by the image sensing enable signal SE when the information for image sensing is generated, The image input to the light receiving element RE is supplied to the image sensing IC (S-IC), so that the image inputted according to the information can be recognized.

Therefore, by configuring the light-receiving element as a white light-emitting element, it is possible to obtain a higher luminance than when the light-receiving element is constituted by a red light emitting element, a green light emitting element, or a blue light emitting element, Effect can be obtained.

In the above-described display device according to the first embodiment of the present invention, the unit pixel serves also as a function of the red light emitting element LE_R, the first green light emitting element LE_G1, the blue light emitting element LE_B, and the light receiving element RE The second green light emitting element LE_G2 is arranged in two rows and two columns or the white light emitting element LE_G that also functions as the red light emitting element LE_R, the green light emitting element LE_G, the blue light emitting element LE_B, (LE_W) are arranged in a single row. However, the present invention is not limited thereto. It should be understood that unit pixels constitute a plurality of light emitting elements for displaying color and that one of the plurality of light emitting elements can implement the function of the light receiving element. It should be understood that the arrangement of the light emitting elements is also changeable as necessary, and other arrangements other than those described in the embodiments of the present specification belong to the present specification.

According to the display device according to the first embodiment of the present invention, an external light source and an image sensor for scanning need not be separately configured, and a light emitting device (for example, an organic light emitting diode) Therefore, there is an effect that the sensing area is not limited and the increase in the size and cost of the optical image sensor can be suppressed.

Further, by arranging a light receiving element spaced a certain distance from the light emitting element to receive the total reflected light out of the light emitted from the light emitting element, a clear optical image can be obtained.

Next, a display device according to a second embodiment of the present invention will be described with reference to Figs. 5 to 7. Fig. The display device according to the second embodiment of the present invention uses a dedicated light receiving element and does not have a switch portion.

5 is a block diagram showing a display device according to a second embodiment of the present invention. FIG. 6 is a plan view schematically showing a first example of one unit pixel of the display device shown in FIG. 5, and FIG. 7 is a plan view showing a second example of one unit pixel of the display device shown in FIG.

The sub-pixels constituting each unit pixel in the second embodiment of the present invention are the same as those shown in Fig. 2 of the first embodiment, and a description thereof will be omitted.

5, the display device according to the second embodiment includes a data driving and image sensing circuit 12, a gate driving circuit 14, a timing controller 16, and a display panel DIS .

The data driving and image sensing circuit 12 includes a data driving IC (D-IC) and an image sensing IC (S-IC).

The data driving IC (D-IC) converts the digital video data (RGB) input from the timing controller 16 to an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving IC (D-IC) is supplied to the pixels of the display panel DIS via the data lines D1 to Dm.

The image sensing IC S-IC responds to the image sensing enable signal SE by using the light receiving element of the selected display panel DIS to display image information of an object that is in proximity to or touches the display panel DIS Through the lead-out lines RO1 to ROk. The object may be a part of a human body including biometric information such as a fingerprint of a finger having fingerprint information.

The gate driving circuit 14 sequentially supplies gate pulses synchronized with the data voltages to the gate lines G1 to Gn to select the pixels of the display panel DIS to which the data voltages are written.

The timing controller 16 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 19 And synchronizes the operation timings of the data driving IC (D-IC) and the gate driving circuit (14). The data timing control signal for controlling the data driving IC (D-IC) may include a source sampling clock (SSC), a source output enable (SOE) signal, and the like. The gate timing control signal for controlling the gate driving circuit 14 includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE . ≪ / RTI > The control signal for controlling the image sensing IC (S-IC) may include an image sensing enable signal (SE) or the like.

The pixel array of the display panel DIS includes a plurality of gate lines (G1 to Gn, n being a positive integer) and a plurality of data lines (D1 to Dm, m are positive integers) And a plurality of unit pixels P1, P2, ... (unit pixels) connected to the gate lines G1 to Gn and the plurality of data lines D1 to Dm. Each of the unit pixels P1, P2, ... includes a plurality of light emitting elements, and one of the plurality of light emitting elements has a function of a light receiving element. Each unit pixel P1, P2, ... may include a plurality of light emitting elements and a light receiving element. In this specification, the light emitting elements and the light emitting element having the light receiving element function may include an organic light emitting diode (OLED).

Hereinafter, a first example of the display device according to the second embodiment of the present invention will be described with reference to FIG.

Fig. 6 is a plan view showing a first example of one unit pixel of the display device shown in Fig. 5, and shows only the configuration of the switch TFT and the light emitting element of the cell drive control section (CDC) shown in Fig.

In the example of FIG. 6, the red light emitting element LE_R, the green light emitting element LE_G, the blue light emitting element LE_B, and the light receiving element RE are arranged in two rows and two columns. Specifically, the red light emitting element LE_R is connected to the first gate line G1 and the first data line D1 through the switch TFT ST11, and the green light emitting element LE_G is connected to the first gate line G1 through the switch TFT ST12 And the blue light emitting element LE_B is connected to the second gate line G2 and the second data line D2 through the switch TFT ST22 and is connected to the first gate line G1 and the second data line D2, do. The first data line D1 and the second data line D2 are connected to the data driving IC (D-IC).

The light receiving element RE is connected to the second gate line G2 and the lead-out wiring RO1 through the switch TFT ST21. The lead-out wiring RO1 is connected to the image sensing IC (S-IC).

In the example of Fig. 6, the image sensing IC (S-IC) receives the image sensing enable signal SE supplied from the timing controller 16 via the lead-out line RO1 connected to the light- And the light emitted from the light emitting element is supplied.

Therefore, in the display mode in the steady state, since the data voltage is supplied to the three light emitting devices LE_R, LE_G, and LE_B through the first and second data lines D1 and D2, data is displayed on the display panel DIS And when information such as touch (or contact) or proximity is generated on the display panel DIS (for example, when a secret icon is clicked or when a guidance window for approval is clicked), this is not restrictive The three light emitting elements LE_R, LE_G and LE_B emit light and one light receiving element RE senses the image of the object generated by the information so that the image can be recognized according to the information .

Next, a second example of the display device according to the second embodiment of the present disclosure will be described with reference to FIG.

Fig. 7 is a plan view showing a second example of one unit pixel of the display device shown in Fig. 5, and shows only the configuration of the switch TFT and the light emitting element of the cell drive control section (CDC) shown in Fig.

Referring to FIG. 7, one unit pixel includes a red light emitting element LE_R, a green light emitting element LE_G, a blue light emitting element LE_B, and a light receiving element RE.

In the example of FIG. 7, the red light emitting element LE_R, the green light emitting element LE_G, the blue light emitting element LE_B, and the light receiving element RE are arranged in one row. For example, the red light emitting element LE_R is connected to the first gate line G1 and the first data line D1 through the switch TFT ST11, and the green light emitting element LE_G1 is connected to the switch TFT ST12 To the first gate line (G1) and the second data line (D2). Further, the blue light emitting element LE_B is connected to the first gate line G1 and the third data line D3 through the switch TFT ST13. The first to third data lines D1 to D3 are connected to the data driving IC (D-IC).

Then, the light receiving element RE is connected to the lead-out line RO1 through the switch TFT ST14. The lead-out line RO1 is connected to the image sensing IC (S-IC).

7, the image sensing IC (S-IC) is connected to the light-receiving element RE via the lead-out line RO1 connected to the light-receiving element RE in response to the image sensing enable signal SE supplied from the timing controller 16. [ And the light emitted from the light emitting element is supplied.

Therefore, in the display mode in the steady state, since the data voltage is supplied to the three light emitting devices LE_R, LE_G, and LE_B through the first and second data lines D1 and D2, data is displayed on the display panel DIS And when information such as touch (or contact) or proximity is generated on the display panel DIS (for example, when a secret icon is clicked or when a guidance window for approval is clicked), this is not restrictive The three light emitting elements LE_R, LE_G and LE_B emit light and one light receiving element RE senses the image of the object generated by the information so that the image can be recognized according to the information .

According to the display device according to the second embodiment of the present invention, an external light source and an image sensor for scanning do not need to be separately configured, and a light emitting element (for example, an organic light emitting diode) Therefore, there is an effect that the sensing area is not limited and the increase in the size and cost of the optical image sensor can be suppressed.

Further, by arranging a light receiving element spaced a certain distance from the light emitting element to receive the total reflected light out of the light emitted from the light emitting element, a clear optical image can be obtained.

Next, the display device according to the third embodiment of the present invention will be described with reference to Figs. 8 to 9B. The display device according to the third embodiment of the present invention can always sense an image without generating information for sensing an image of a specific object.

8 is a block diagram showing a display device according to the third embodiment of the present invention. 9A and 9B are equivalent circuit diagrams showing one unit pixel of the display device shown in FIG. Specifically, Fig. 9A is a circuit diagram for explaining a case where a light-emitting element serving as a light-receiving element operates as a light-emitting element when driving a display panel, and Fig. 9B illustrates a case where a light- ≪ / RTI >

8, the display device according to the third embodiment includes a data driving and image sensing circuit 12, a gate driving circuit 14, a timing controller 16, and a display panel DIS .

The data driving and image sensing circuit 12 includes a data driving IC (D-IC) and an image sensing IC (S-IC).

The data driving IC (D-IC) converts the digital video data (RGB) input from the timing controller 16 to an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving IC (D-IC) is supplied to the pixels of the display panel DIS via the data lines D1 to Dm.

The image sensing IC S-IC responds to the image sensing enable signal SE by using the light receiving element of the selected display panel DIS to display image information of an object that is in proximity to or touches the display panel DIS Through the lead-out lines RO1 to ROk. The object may be a part of a human body including biometric information such as a fingerprint of a finger having fingerprint information.

The gate driving circuit 14 sequentially supplies gate pulses synchronized with the data voltages to the gate lines G1 to Gn to select the pixels of the display panel DIS to which the data voltages are written.

The timing controller 16 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 19 And synchronizes the operation timings of the data driving IC (D-IC) and the gate driving circuit (14). The data timing control signal for controlling the data driving IC (D-IC) may include a source sampling clock (SSC), a source output enable (SOE) signal, and the like. The gate timing control signal for controlling the gate driving circuit 14 includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE . ≪ / RTI > The control signal for controlling the image sensing IC (S-IC) may include an image sensing enable signal (SE) or the like.

The pixel array of the display panel DIS includes a plurality of gate lines (G1 to Gn, n being positive integers) and a plurality of data lines (D1 to Dm, m are positive integers) A plurality of unit pixels P1, P2, ... connected to the gate lines G1 to Gn and the plurality of data lines D1 to Dm. Each of the unit pixels P1, P2, ... includes a plurality of light emitting elements, and one of the plurality of light emitting elements has a function of a light receiving element. Alternatively, each of the unit pixels P1, P2, ... may include a plurality of light emitting elements and a light receiving element. In this specification, the light emitting elements and the light emitting element having the light receiving element function may include an organic light emitting diode (OLED).

Hereinafter, a display device according to a third embodiment of the present invention will be described with reference to FIGS. 9A and 9B.

9A is a circuit diagram for explaining a case where a light emitting element serving as a light receiving element and a light emitting element when operating a display panel, and FIG. 9B is a circuit diagram for explaining a case where a light emitting element serving as a light receiving element operates as a light receiving element in image sensing .

9A and 9B show the overall configuration including the switch TFT and the light emitting element of the cell drive control unit (CDC) of the sub-pixel constituting the unit pixel shown in FIG.

9A and 9B, one of the plurality of light emitting elements belonging to one unit pixel also functions as a light receiving element. The arrangement of the plurality of light emitting elements and the light receiving element serving as the light emitting element will be described as having the two-row two-column or one-row arrangement already described in connection with the first embodiment of Figs. In FIGS. 9A and 9B, when the sign of the gate line and the data line are G2 and D1, the second green light emitting element, which also serves as the light receiving element in the case where the light emitting element of the unit pixel is the two- And the signs of the gate line and the data line are G1 and D4, the light emitting element of the unit pixel also serves as the light receiving element in the case of the one row arrangement structure shown in Fig.

The light emitting elements LE_R, LE_G1, LE_B or LE_R, LE_G, LE_B of the display device according to the third embodiment of the present invention have the same configuration as the light emitting element shown in FIG.

As shown in Figs. 9A and 9B, in addition to the configuration of Fig. 2, the light-emitting element (LE_G2 or LE_W) serving also as a light-receiving element of the display device according to the third embodiment of the present invention includes a second switch TFT (ST2) . The second switch TFT ST2 includes a gate electrode connected to the first node n1 and a first electrode connected to a connection point between the drive thin film TFT DT and the organic light emitting diode OLED as a light emitting element, And a second electrode connected to the image sensing IC (S-IC) through the first electrode RO1.

Hereinafter, the structure of the light-emitting element (LE_G2 or LE_W) serving as the light-receiving element of the display device according to the third embodiment of the present invention will be described.

9A and 9B, a light emitting element LE_G2 or LE_W serving as a light receiving element includes a light emitting element LE, a driving thin film transistor (driving TFT) for controlling the amount of current I flowing to the light emitting element LE, A cell drive control section (CDC) for setting the gate-source voltage of the drive TFT DT, and a second switch TFT (ST2) as a sensing enable switch for enabling image sensing.

The cell drive control unit CDC may include a first switch TFT ST1 and a storage capacitor Cst. The first switch TFT ST1 includes a gate electrode connected to the gate line G1, a first electrode connected to the data line D1, and a second electrode connected to the first node n1. The storage capacitor Cst includes a first electrode connected to the first node n1 and a second electrode connected to the high potential power supply line Vdd. The second electrode of the first switch TFT (ST1), the gate electrode of the driver TFT (DT), and the first electrode of the storage capacitor (Cst) are connected to the first node (n1). To the second node n2, a high potential power supply line Vdd, a second electrode of the storage capacitor Cst, and a first electrode of the driving TFT DT are connected.

The driving TFT DT includes a first electrode connected to the second node n2 connected to the high potential power supply line Vdd, a gate electrode connected to the first node n1, and a light emitting element LE For example, the organic light emitting diode OLED of FIG. 2).

The light emitting element LE is connected between the second electrode of the driving TFT DT and the low potential power supply line Vss.

The second switch ST2 has a gate electrode connected to the first node n1 and supplied with the same control signal as the control signal supplied to the gate electrode of the driving TFT DT, And a second electrode connected to the image sensing IC (S-IC) through the lead-out line RO1.

Next, with reference to Fig. 9A, a description will be given of a case where the light-emitting element serving as a light-receiving element (for example, LE_G2) functions as the light-emitting element LE.

When a gate on voltage is applied to a gate line (for example, G2) connected to a light emitting element (for example, LE_G2) LE serving as a light receiving element, the first switch TFT ST1 is turned on, The data voltage supplied through the line (for example, D1) is supplied to the first node n1. The storage capacitor Cst stores the data voltage until the high-potential voltage supplied by the high-potential power supply line Vdd and the voltage supplied to the node n1 become the same potential. Then, the driving TFT DT is turned on by the data voltage supplied to the first node n1 to supply a high potential voltage to the light emitting element LE, and the light emitting element LE emits light to the outside. At this time, since the second switch TFT (ST2) is configured in a different type from the drive TFT (DT), it is turned off when the drive TFT is turned on. Therefore, the light-emitting element serving as the light-receiving element (for example, LE_G2) functions as the light-emitting element LE.

Next, referring to Fig. 9B, a description will be given of a case where the light-emitting element (for example, LE_G2) serving as the light-receiving element functions as the light-receiving element RE.

The first switch TFT ST1 is turned off when a gate off voltage is applied to the gate line (for example, G2) connected to the light-emitting element (for example, LE_G2) LE. Thus, the connection between the first data line D1 and the first node n1 is cut off and the data voltage is not supplied to the first node n1. The storage capacitor Cst discharges the charged voltage to the node n1 during the period when the gate line G2 is turned on. The voltage discharged from the storage capacitor Cst does not turn on the drive TFT DT but is supplied to the gate electrode of the second switch TFT ST2 to turn on the second switch TFT ST2. When the second switch TFT (ST2) is turned on, the light energy supplied to the light emitting element serving as the light receiving element (for example, LE_G2) LE is sensed through the second switch TFT (ST2) and the lead out line (RO1) And is supplied to a sensing IC (S-IC). 9A and 9B, the first switch TFT (ST1) and the drive TFT (DT) are of the p type (for example, The first switch TFT ST1 and the drive TFT DT are n-type, and the second switch TFT (ST2) is n-type. However, the present invention is not limited thereto, ST2) may be of p type. That is, by configuring the second switch TFT (ST2) and the drive TFT (DT) to be different types, the second switch TFT (ST2) can operate as a light emitting element serving as a light receiving element have.

According to the display device according to the third embodiment of the present invention, an external light source and an image sensor for scanning need not be separately configured, and a light emitting device (for example, an organic light emitting diode) Therefore, there is an effect that the sensing area is not limited and the increase in the size and cost of the optical image sensor can be suppressed.

Further, by arranging a light receiving element spaced a certain distance from the light emitting element to receive the total reflected light out of the light emitted from the light emitting element, a clear optical image can be obtained.

Next, the display device according to the fourth embodiment of the present invention will be described with reference to Figs. 10 to 11B. The display device according to the fourth embodiment of the present invention can always sense an image without generating information for sensing an image of a specific object. In addition, the display device according to the fourth embodiment of the present invention may separately include a light receiving element for image sensing for each unit pixel.

10 is a block diagram showing a display device according to a fourth embodiment of the present invention. 11A and 11B are equivalent circuit diagrams showing one unit pixel of the display device shown in FIG. Specifically, Fig. 11A is a circuit diagram for explaining a case where the light emitting element operates as a light emitting element when driving a display panel, and Fig. 11B is a circuit diagram for explaining a case where the light receiving element operates as a light receiving element in image sensing.

10, the display device according to the fourth embodiment includes a data driving and image sensing circuit 12, a gate driving circuit 14, a timing controller 16, and a display panel DIS .

The data driving and image sensing circuit 12 includes a data driving IC (D-IC) and an image sensing IC (S-IC).

The data driving IC (D-IC) converts the digital video data (RGB) input from the timing controller 16 to an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving IC (D-IC) is supplied to the pixels of the display panel DIS via the data lines D1 to Dm.

The image sensing IC S-IC responds to the image sensing enable signal SE by using the light receiving element of the selected display panel DIS to display image information of an object that is in proximity to or touches the display panel DIS Through the lead-out lines RO1 to ROk. The object may be a part of a human body including biometric information such as a fingerprint of a finger having fingerprint information.

The gate driving circuit 14 sequentially supplies gate pulses synchronized with the data voltages to the gate lines G1 to Gn to select the pixels of the display panel DIS to which the data voltages are written.

The timing controller 16 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 19 And synchronizes the operation timings of the data driving IC (D-IC) and the gate driving circuit (14). The data timing control signal for controlling the data driving IC (D-IC) may include a source sampling clock (SSC), a source output enable (SOE) signal, and the like. The gate timing control signal for controlling the gate driving circuit 14 includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE . ≪ / RTI > The control signal for controlling the image sensing IC (S-IC) may include an image sensing enable signal (SE) or the like.

The pixel array of the display panel DIS includes a plurality of gate lines (G1 to Gn, n being a positive integer) and a plurality of data lines (D1 to Dm, m are positive integers) And a plurality of unit pixels P1, P2, ... (unit pixels) connected to the gate lines G1 to Gn and the plurality of data lines D1 to Dm. Each of the unit pixels P1, P2, ... includes a plurality of light emitting elements and one light receiving element. In the present invention, the light emitting elements and the light emitting element having the light receiving element function may include an organic light emitting diode (OLED).

Hereinafter, the display device according to the fourth embodiment of the present invention will be described with reference to Figs. 11A and 11B.

Fig. 11A is a circuit diagram for explaining the operation of the light-emitting element constituting the unit pixel, and Fig. 11B is a circuit diagram for explaining the operation of the light-receiving element constituting the unit pixel.

11A and 11B, the arrangement of the plurality of light emitting elements and one light receiving element belonging to one unit pixel is the same as the arrangement of the two rows and two columns, or the one row described in conjunction with the second embodiment of Figs. It will be described as having a row arrangement. In Figs. 11A and 11B, when the sign of the gate line and the data line is G2 and D1, the light emitting element and the light receiving element in the case where the light emitting element of the unit pixel is the two row, two column arrangement structure shown in Fig. 6 And the signs of the gate line and the data line are G1 and D4, the light emitting element and the light receiving element in the case where the light emitting element of the unit pixel has the one row arrangement structure shown in FIG.

The sub-pixel having the light emitting element LE of the display device according to the fourth embodiment of the present invention has the same configuration as the sub-pixel shown in Fig. 2 as shown in Fig. 11A.

11A, when a gate on voltage is applied to a gate line (for example, G2) connected to the light emitting element LE, the switch TFT ST is turned on and turned on to the first data line (for example, D1 is supplied to the first node n1. The storage capacitor Cst stores the data voltage until the high-potential voltage supplied by the high-potential power supply line Vdd and the voltage supplied to the node n1 become the same potential. Then, the driving TFT DT is turned on by the data voltage supplied to the first node n1 to supply a high potential voltage to the light emitting element LE, and the light emitting element LE emits light to the outside.

The sub-pixel having the light-receiving element LE of the display device according to the fourth embodiment of the present disclosure may have the configuration as shown in Fig. 11B.

The light receiving element LE of the display device according to the fourth embodiment of the present invention includes a first electrode connected to the reset line RL and a second electrode connected to the first electrode of the light receiving capacitor Css. The light-receiving capacitor Css includes a second electrode connected to the common line CL. A gate electrode connected to the gate line (for example, G2) of the sensing switch TFT (ST3), a first electrode connected to the first electrode of the light receiving capacitor Css and the second electrode of the light receiving element LE, And a second electrode connected to the image sensing IC (S-IC) via the lead-out line RO1.

Referring to FIG. 11B, when light emitted from the light emitting element LE is received by the light receiving element RE, a photocurrent flows to the first electrode of the light receiving capacitor Css and the first electrode of the sensing switch TFT ST3. At this time, when a gate on voltage is applied to the gate line (for example, G2), the sensing switch TFT (ST3) is turned on so that the photocurrent from the light receiving element (RE) IC (S-IC), the image sensing IC (S-IC) can sense an image of a specific object. On the other hand, if a gate off voltage is applied to the gate line (for example, G2), the sensing switch TFT (ST3) is turned off. If a reset signal is applied to the reset line RL at this time, The charge stored in the reset line RL is discharged until the common line CL and the reset line RL become equal potential, and the initial state can be maintained.

According to the display device according to the fourth embodiment of the present invention, it is not necessary to separately configure an image sensor for scanning with an external light source, and a light emitting device (for example, an organic light emitting diode) Therefore, there is an effect that the sensing area is not limited and the increase in the size and cost of the optical image sensor can be suppressed.

Further, by arranging a light receiving element spaced a certain distance from the light emitting element to receive the total reflected light out of the light emitted from the light emitting element, a clear optical image can be obtained.

Next, the relationship between the light emitting element and the light receiving element which can be used as an optical image sensor in the display device according to the first to fourth embodiments of the present invention will be described.

12 is a view for explaining the distance setting between the light emitting element and the light receiving element for image sensing in the display device according to the first to fourth embodiments of the present invention.

Referring to FIG. 12, each unit pixel of the display panel includes a plurality of light emitting elements and a light receiving element. The light receiving element may have both a light emitting function and a light receiving function or only a light receiving function.

A plurality of insulating layers and a cover window (CW) may be stacked on the light emitting element and the light receiving element. The cover window CW is an object on the uppermost layer of the display panel located closest to the object so that an object (for example, a finger having fingerprint information) can touch or approach for inputting information. Hereinafter, a finger having fingerprint information as an object contacting the uppermost layer object will be described as an example, but the present invention is not limited thereto, and can be applied to objects having irregularities including ridges and ridges.

The light emitted from the light emitting element LE can be incident on the uppermost cover window CW at various incidence angles. When the light incident into the cover window is larger than the total reflection angle (or the total reflection critical angle) [theta], the light is reflected and refracted toward the inside of the display panel, but when it is smaller than the total reflection angle [theta] When the finger is placed on the upper surface of the cover window when the incident light is greater than the total reflection angle?, The amount of light totally reflected by the valley V and the ridge R constituting the fingerprint of the finger is changed. Therefore, the image sensing IC (S-IC) can detect the image of the fingerprint on the basis of the magnitude of the optical current flowing from the light receiving element RE because the photoelectric current having a different value flows through the light receiving element RE It becomes possible to reconfigure. And, in order to obtain a clearer fingerprint image, the signal to noise ratio can be increased. In order to increase the signal-to-noise ratio, the light emitting devices sequentially emit light to cut off the light of the non-selected light emitting devices, and one light receiving device can increase the amount of light by integrating the light of a plurality of light emitting devices sequentially emitting light.

As described above, in addition to the light-receiving element for receiving the totally-reflected light, there may be a light-receiving element for receiving the vertically emitted light. In the case of a light receiving element that receives vertically emitted light, most of the light incident on the valleys (V) and ridges (R) pass through and only a part of the light is reflected. Blurring phenomenon occurs. However, in the case of using a light receiving element that receives total reflected light, when light larger than the critical angle is incident on the valley V, the incident light is totally reflected. When the light is incident on the ridge R, most of the incident light is transmitted. Therefore, since the intensities of light reflected from the valleys V and the ridges R are different from each other, the shape of the fingerprint can be clearly recognized.

In the display device according to the first to fourth embodiments of the present invention, the distance L between the light emitting element for emitting light and the light receiving element for receiving the light emitted from the light emitting element LE, (E.g., a cover window) to which light from the light emitting element is totally reflected is H, the refractive index of the substance constituting the uppermost layer is n, a first virtual line extending from the light emitting element so as to be perpendicular to the display panel, And the second virtual line extending from the light emitting element to the object is?, The following formula (1) can be used by using the formula sin? = 1 / n concerning the total reflection critical angle.

For example, when the refractive index of the uppermost layer object is 1.5 and the thickness is 0.55 mm, the total reflection critical angle θ is 42 ° according to the formula relating to the total reflection critical angle, so total reflection occurs when the total critical angle is 42 ° or more. Since the distance L between the light emitting element LE and the light receiving element RE is 0.5 mm according to Equation 1, the light emitting element LE and the light receiving element RE must be separated by a distance of 0.5 mm or more.

Therefore, according to the display device of the present specification, a clear optical image can be obtained by disposing the light receiving element spaced apart from the light emitting element by a certain distance in order to receive the total reflected light out of the light emitted from the light emitting element.

In the pixel according to the embodiments of the present invention, the switch TFTs (ST, ST1, ST2, ST3) and the drive TFT DT are three-electrode elements including a gate, a source, and a drain. The source is an electrode that supplies a carrier to the transistor. In the TFT, carriers begin to flow from the source. The drain is an electrode through which the carrier exits. The flow of carriers from the transistor flows from the source to the drain. In the case of the n type, since the carrier is an electron, the source voltage has a voltage lower than the drain voltage so that electrons can flow from the source to the drain. In n-type, the direction of current flows from drain to source. In the case of p type, since the carrier is a hole, the source voltage is higher than the drain voltage so that holes can flow from the source to the drain. In p-type, since the holes flow from the source to the drain, current flows from the source to the drain. Therefore, the source and drain of the TFT are not fixed because they may vary depending on the applied voltage. It should be noted that in the following embodiments, the transistor is not limited to any particular type of transistor because of the source and the drain.

The gate signal applied to the pixel circuit swings between the gate on voltage and the gate off voltage. The gate-on voltage is set to a voltage higher than the threshold voltage of the transistor, and the gate-off voltage is set to a voltage lower than the threshold voltage of the transistor. The transistor is turned on in response to the gate-on voltage, while it is turned off in response to the gate-off voltage. In the case of an NMOS, the gate-on voltage may be a gate high voltage (VGH), and the gate-off voltage may be a gate low voltage (VGL). In the case of PMOS, the gate-on voltage may be the gate-low voltage (VGL) and the gate-off voltage may be the gate-high voltage (VGH).

In the display device according to the embodiments of the present invention, an optical image sensor can be implemented using a light emitting element (for example, an organic light emitting diode) in a display device without needing to separately configure an external light source and an image sensor for scanning Therefore, it is possible to obtain an effect of suppressing an increase in size and an increase in cost.

In the display device according to the embodiments of the present invention, when the light receiving element is formed of a white light emitting element, higher luminance can be obtained than when a light receiving element is composed of a red light emitting element, a green light emitting element, or a blue light emitting element. It is possible to obtain the effect of sensing the image of the object having the image.

The display device according to the present specification can be described as follows.

A display device according to a first aspect of the present invention includes a display panel including a plurality of gate lines and a plurality of data lines, gate lines, and a plurality of unit pixels connected to the data lines, do. Each of the plurality of unit pixels includes a plurality of light emitting elements. At least one of the plurality of light emitting elements is a light receiving element which emits light from the light emitting elements and receives the light totally reflected by the object on the light output surface of the display panel.

The distance L between the light emitting element and the light receiving element for receiving the light emitted from the light emitting element is expressed by the following equation when the height of the uppermost layer of the light from the light emitting element is H and the refractive index of the material constituting the uppermost layer is n: Can be determined by an equation.

The plurality of light emitting devices may include a red light emitting device, a first green light emitting device, a blue light emitting device, and a second green light emitting device, and the light receiving device may include any one of a first green light emitting device and a second green light emitting device .

The red light emitting element, the first green light emitting element, the blue light emitting element, and the second green light emitting element display data voltages supplied through the data lines when the display panel is driven on the display panel, It is possible to receive the light totally reflected by the object.

The plurality of light emitting elements constituting the plurality of unit pixels may be composed of a red light emitting element, a green light emitting element, a blue light emitting element, and a white light emitting element, and the light receiving element may be formed of a white light emitting element.

The red light emitting element, the green light emitting element, the blue light emitting element, and the white light emitting element display data voltages supplied through the data lines when the display panel is driven, on the display panel. Further, the light receiving element can receive light totally reflected by the object when information is generated due to contact or proximity of the object.

The display panel further includes a data driving IC, an image sensing IC, and a switch portion, and the light receiving element can be selectively connected to the data driving IC or the image sensing IC by the switch portion.

A display device according to a second aspect of the present invention includes a plurality of unit pixels connected to a plurality of gate lines and a plurality of data lines, gate lines, and data lines arranged on a substrate, And a display panel having an uppermost layer covering the unit pixels. Each of the plurality of unit pixels includes a plurality of light emitting elements and at least one light receiving element. The light receiving element is spaced a certain distance from the light emitting element to receive light emitted from any one of the plurality of light emitting elements and totally reflected by the uppermost layer object.

The spaced distance L is defined by a height H of the uppermost layer object, a first virtual line extending from the light emitting element so as to be perpendicular to the display panel, and an angle formed by the first virtual line and a second virtual line extending from the light emitting element to the object, , It can be determined by the following equation.

The plurality of light emitting elements may comprise a red light emitting element, a green light emitting element, and a blue light emitting element.

The red light emitting element, the green light emitting element, and the blue light emitting element display a data voltage supplied through the data lines when the display panel is driven, on the display panel. The light receiving element can receive light totally reflected by the object when information is generated due to contact or proximity of the object.

The plurality of light emitting devices may include a red light emitting device, a green light emitting device, a blue light emitting device, and a white light emitting device.

The red light emitting element, the green light emitting element, and the blue light emitting element display data voltages supplied through the data lines when the display panel is driven on the display panel. The white light emitting device can receive the light totally reflected by the object when information is generated due to contact or proximity of the object.

The display device according to the third aspect of the present invention includes a display panel having a plurality of gate lines arranged on a substrate and a plurality of unit pixels connected to the plurality of data lines, the gate lines and the data lines . Each of the plurality of unit pixels includes a plurality of sub-pixels having a light emitting element, and at least one of the plurality of sub-pixels includes a light emitting element serving also as a light receiving element. A sub-pixel including a light-emitting element serving as a light-receiving element also includes a driving thin film transistor for controlling the amount of current flowing in the light-emitting element serving as a light-receiving element, a cell driving control section for setting a gate- And a switch thin film transistor which is turned off when turned on and turned on when the driving thin film transistor is turned off and the light emitting element serving as a light receiving element is emitted from the plurality of light emitting elements and totally reflected by the object on the light emitting surface of the display panel And receives light.

The distance L between the light emitting element and the light emitting element serving as both the light receiving element and the light receiving element for receiving the light emitted from the light emitting element is given by the following equation: H = H, where the refractive index of the material constituting the uppermost layer is n, The angle formed by the first imaginary line extending from the light emitting element perpendicularly to the display panel and the second imaginary line extending from the first imaginary line and the light emitting element to the object can be determined by the following equation.

If the driving thin film transistor is of the p type, the switch thin film transistor is of the n type, and if the driving thin film transistor is of the n type, the switch thin film transistor may be of the p type.

A display device according to a fourth aspect of the present invention is a display panel including a plurality of gate lines and a plurality of data lines arranged on a substrate and a plurality of unit pixels connected to gate lines and data lines, And an image sensing IC that senses the amount of light through a lead-out line connected to some unit pixels among a plurality of unit pixels. Each of the plurality of unit pixels includes a sub-pixel including a plurality of sub-pixels including a light-emitting element and a light-receiving element. The light receiving element receives the light emitted from the plurality of light emitting elements and totally reflected by the object on the light exit surface of the display panel and transmits the amount of light received through the switch thin film transistor controlled by the gate drive signal supplied to the gate line, To the sensing IC.

The distance L between the light emitting element and the light receiving element for receiving the light emitted from the light emitting element is given by the following equation: H = H, where n is the refractive index of the material constituting the uppermost layer object, The angle formed by the first imaginary line extending perpendicular to the panel and the second imaginary line extending from the first imaginary line and the light emitting element to the object can be determined by the following equation.

The first electrode of the switch thin film transistor may be connected to the light receiving element, and the second electrode of the switch thin film transistor may be connected to the lead out line.

The object may have irregularities that include ridges and ridges.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the technical scope of the present specification should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

12: Data driving and image sensing circuit D-IC: Data driving IC
S-IC: Image sensing IC 14: Gate driving circuit,
16: Timing controller SW:
S1, S2, ... Sk: Selection switch DIS: Display panel
DL, D1 to Dm: data line GL, G1_Gn: gate line
RO1, RO2, ... ROk: lead out line CL: common line
RL: reset line CDC: cell drive control section
DT: driving TFT
ST, ST11, SR12, ST21, ST22: Switch TFT
OLED: Organic Light Emitting Diode (Light Emitting Diode)
LE, LE_R, LE_G1, LE_B: Light emitting element
LE_G2, LE_W: Light-emitting element serving as light-receiving element
RE: light receiving element SE: image sensing enable signal

Claims (20)

A plurality of gate lines and a plurality of data lines arranged on a substrate; And
And a display panel having a plurality of unit pixels connected to the gate lines and the data lines,
Wherein each of the plurality of unit pixels includes a plurality of light emitting elements and at least one of the plurality of light emitting elements emits light from the light emitting elements and receives light totally reflected by an object on a light output surface of the display panel Receiving element. The method according to claim 1,
The distance L between the light emitting element and the light receiving element for receiving the light emitted from the light emitting element is set such that the height of the uppermost layer on which light from the light emitting element is totally reflected is H and the refractive index of the material constituting the uppermost layer is n Is determined by the following expression.

The method according to claim 1,
Wherein the plurality of light emitting elements are constituted by a red light emitting element, a first green light emitting element, a blue light emitting element, and a second green light emitting element, and the light receiving element is any one of the first green light emitting element and the second green light emitting element A display device configured. The method of claim 3,
Wherein the red light emitting element, the first green light emitting element, the blue light emitting element, and the second green light emitting element display data voltages supplied through the data lines when the display panel is driven,
Wherein the light receiving element receives light totally reflected by the object when information is generated due to contact or proximity of the object. The method according to claim 1,
Wherein the plurality of light emitting elements constituting the plurality of unit pixels are constituted by a red light emitting element, a green light emitting element, a blue light emitting element, and a white light emitting element, and the light receiving element is constituted by the white light emitting element. 6. The method of claim 5,
Wherein the red light emitting element, the green light emitting element, the blue light emitting element, and the white light emitting element display a data voltage supplied through the data lines when the display panel is driven,
Wherein the light receiving element receives light totally reflected by the object when information is generated due to contact or proximity of the object. The method according to claim 1,
Wherein the display panel further comprises a data driving IC, an image sensing IC, and a switch portion,
And the light receiving element is selectively connected to the data driving IC or the image sensing IC by the switch unit. A plurality of gate lines and a plurality of data lines arranged on a substrate; And
A plurality of unit pixels connected to the gate lines and the data lines; And
And a display panel having an uppermost layer object covering the unit pixels on the unit pixels,
Wherein each of the plurality of unit pixels includes a plurality of light emitting elements and at least one light receiving element, and the light receiving element emits light from any one of the plurality of light emitting elements to receive light totally reflected by the uppermost layer object And the light emitting element is spaced apart from the light emitting element by a predetermined distance. 9. The method of claim 8,
Wherein the distance L is a distance between the first virtual line and the second virtual line extending from the light emitting element to the object, the height of the uppermost layer being H, the first virtual line extending from the light emitting element perpendicularly to the display panel, Is determined by the following expression when?

9. The method of claim 8,
Wherein the plurality of light emitting elements comprise a red light emitting element, a green light emitting element, and a blue light emitting element. 11. The method of claim 10,
Wherein the red light emitting element, the green light emitting element, and the blue light emitting element display data voltages supplied through the data lines when the display panel is driven on the display panel,
Wherein the light receiving element receives light totally reflected by the object when an event occurs due to contact or proximity of the object. 9. The method of claim 8,
Wherein the plurality of light emitting elements comprises a red light emitting element, a green light emitting element, a blue light emitting element, and a white light emitting element. 13. The method of claim 12,
Wherein the red light emitting element, the green light emitting element, and the blue light emitting element display data voltages supplied through the data lines when the display panel is driven on the display panel,
Wherein the white light emitting device receives light totally reflected by the object when information is generated due to contact or proximity of the object. A plurality of gate lines and a plurality of data lines arranged on a substrate; And
And a display panel having a plurality of unit pixels connected to the gate lines and the data lines,
Wherein each of the plurality of unit pixels includes a plurality of sub-pixels including a light emitting element, at least one of the plurality of sub-pixels includes a light emitting element serving also as a light receiving element,
The sub-pixel including the light-emitting element serving as the light-receiving element also includes a driving thin film transistor for controlling the amount of current flowing in the light-emitting element serving as the light-receiving element, a cell drive control section for setting the gate- And a switch thin film transistor which is turned off when the driving thin film transistor is turned on and turned on when the driving thin film transistor is turned off, wherein the light emitting element serving as the light receiving element is emitted from the plurality of light emitting elements, And receives the light totally reflected by the object on the surface. 15. The method of claim 14,
The distance L between the light emitting element and the light emitting element serving as both the light receiving element and the light receiving element for receiving the light emitted from the light emitting element is set such that the height of the uppermost layer on which light from the light emitting element is totally reflected is H, A first virtual line extending from the light emitting element perpendicularly to the display panel and an angle formed by the first virtual line and a second virtual line extending from the light emitting element to the object, Is determined by a formula.

15. The method of claim 14,
Wherein the switch thin film transistor is n-type when the driving thin film transistor is p-type and is p-type if the driving thin film transistor is n-type. A plurality of gate lines and a plurality of data lines arranged on a substrate; And
A display panel having a plurality of unit pixels connected to the gate lines and the data lines; And
And an image sensing IC that senses the amount of light through a lead-out line connected to some unit pixels among the plurality of unit pixels,
Wherein each of the plurality of unit pixels includes a sub-pixel including a plurality of sub-pixels including a light-emitting element and a light-receiving element,
Wherein the light receiving element receives the light emitted from the plurality of light emitting elements and totally reflected by the object on the light exit surface of the display panel and receives light through a switch thin film transistor controlled by a gate driving signal supplied to the gate line And supplies the light amount to the image sensing IC.

18. The method of claim 17,
The distance L between the light emitting element and the light receiving element for receiving the light emitted from the light emitting element is set such that the height of the uppermost layer on which light from the light emitting element is totally reflected is H and the refractive index of the material constituting the uppermost layer is n A first virtual line extending perpendicularly to the display panel from the light emitting element and an angle formed by the first virtual line and a second virtual line extending from the light emitting element to the object, / RTI >

18. The method of claim 17,
Wherein a first electrode of the switch thin film transistor is connected to the light receiving element and a second electrode of the switch thin film transistor is connected to the lead out line. 18. The method of claim 17,
Wherein the object has irregularities including ridges and ridges.

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