Display device

Abstract

The utility model discloses a display device, which comprises a plurality of pixels arranged in a display area of a display panel; and a display driving circuit that supplies a data voltage and a pixel driving control signal to the plurality of pixels to control an image display operation of each of the plurality of pixels, the display driving circuit may supply, to at least one thin film transistor included in the plurality of pixels, an active control voltage that changes directly or inversely proportional to a temperature change of the display panel.

Description

Technical Field

[0001] The utility model relates to a display device. Background Art

[0002] With the development of the information society, the demand for display devices for displaying images in various forms has increased. For example, display devices are being applied to various electronic devices such as smartphones, digital cameras, laptop computers, navigation devices, and smart TVs.

[0003] The display device may be a flat panel display device such as a liquid crystal display device, a field emission display device, or an organic light emitting display device. Among such flat panel display devices, the light emitting display device includes a light emitting element that enables each pixel of the display panel to emit light, thereby enabling images to be displayed even without a backlight unit that provides light to the display panel.

[0004] In light-emitting display devices, characteristics such as the threshold voltage and mobility of switching elements (e.g., thin-film transistors) vary from pixel to pixel due to temperature fluctuations in the operating environment. This causes a high-voltage drop across each pixel, leading to variations in the current driving the light-emitting element and resulting in variations in brightness between pixels. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a display device capable of minimizing the influence of changes in operating temperature to reduce the brightness deviation of image display pixels.

[0006] Furthermore, the present invention aims to provide a display device that can adjust the voltage or current of a switching element (eg, a thin film transistor) of each image display pixel according to temperature changes to maintain image display quality.

[0007] The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art through the following description.

[0008] A display device according to one embodiment for solving the above-mentioned technical problem may include: a plurality of pixels arranged in a display area of ​​a display panel; and a display driving circuit for supplying data voltages and pixel driving control signals to the plurality of pixels to control the image display operation of each of the plurality of pixels, wherein the display driving circuit may supply an active control voltage to at least one thin film transistor included in the plurality of pixels, the active control voltage varying in direct proportion or inverse proportion to a temperature change of the display panel.

[0009] The multiple pixels may include light-emitting elements and pixel circuits that control the amount of light emitted by the light-emitting elements, wherein the pixel circuits may include multiple thin-film transistors and at least one capacitor, and at least one first thin-film transistor among the multiple thin-film transistors includes: a first gate electrode; a first active layer that covers the first gate electrode with a preset first planar area size and is patterned; a first source electrode that is formed to cover the first gate electrode and a portion of the first active layer that overlaps with the first gate electrode; and a first drain electrode that is formed in a direction opposite to the first source electrode to cover the first gate electrode and a portion of the first active layer that overlaps with the first gate electrode.

[0010] At least one second thin film transistor among the multiple thin film transistors may include: a second gate electrode; a second active layer, which covers the second gate electrode with a preset second planar area size and is patterned; a second source electrode, which is formed to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode; and a second drain electrode, which is formed in a direction opposite to the second source electrode to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode.

[0011] A first planar area of ​​the first active layer may be formed to be larger or wider than a second planar area of ​​the second active layer.

[0012] The height or thickness of the first active layer may be formed to be higher or thicker than the height or thickness of the second active layer.

[0013] A width of the first active layer in at least one direction may be formed to be wider than a width of the second active layer in at least one direction.

[0014] In at least one first thin film transistor among the plurality of thin film transistors, the first active layer may be electrically connected to the drain electrode or the source electrode, or the gate electrode may be electrically connected to the drain electrode or the source electrode, thereby forming a diode structure or a self-biased structure.

[0015] In at least one first thin film transistor among the plurality of thin film transistors, the first active layer may be electrically connected to the display driving circuit through respective voltage control wirings, and receive the active control voltage from the display driving circuit in units of predetermined periods.

[0016] The display driving circuit can change the voltage of the active control voltage in inverse proportion to the temperature of the display panel or the external temperature, and supply the active control voltage with changed voltage to the first active layer of the first thin film transistor through the voltage control wiring.

[0017] The display driving circuit can change the voltage of the active control voltage in proportion to the temperature of the display panel or the external temperature, and supply the active control voltage with changed voltage to the first active layer of the first thin film transistor through the voltage control wiring.

[0018] A display device according to one embodiment for solving the above-mentioned technical problems may include: a plurality of pixels arranged in a display area of ​​a display panel; and a touch sensing portion mounted on a front surface portion of the display panel or formed integrally with the display panel; a touch driving circuit for sensing the touch of a human body or a touch pen using a plurality of touch electrodes arranged in the touch sensing portion; and a display driving circuit for supplying data voltages and pixel driving control signals to the plurality of pixels to control the image display operation of each of the plurality of pixels, wherein the display driving circuit may supply an active control voltage to at least one thin film transistor included in the plurality of pixels that changes in direct proportion or inverse proportion to the temperature change of the display panel.

[0019] The multiple pixels may include light-emitting elements and pixel circuits that control the amount of light emitted by the light-emitting elements, wherein the pixel circuits may include multiple thin-film transistors and at least one capacitor, and at least one first thin-film transistor among the multiple thin-film transistors includes: a first gate electrode; a first active layer that covers the first gate electrode with a preset first planar area size and is patterned; a first source electrode that is formed to cover the first gate electrode and a portion of the first active layer that overlaps with the first gate electrode; and a first drain electrode that is formed in a direction opposite to the first source electrode to cover the first gate electrode and a portion of the first active layer that overlaps with the first gate electrode.

[0020] At least one second thin film transistor among the multiple thin film transistors may include: a second gate electrode; a second active layer, which covers the second gate electrode with a preset second planar area size and is patterned; a second source electrode, which is formed to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode; and a second drain electrode, which is formed in a direction opposite to the second source electrode to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode.

[0021] The first planar area of ​​the first active layer can be formed to be larger or wider than the second planar area of ​​the second active layer, the height or thickness of the first active layer can be formed to be higher or thicker than the height or thickness of the second active layer, and the width of the first active layer in at least one direction can be formed to be wider than the width of the second active layer in at least one direction.

[0022] In at least one first thin film transistor among the plurality of thin film transistors, the first active layer may be electrically connected to the drain electrode or the source electrode, or the gate electrode may be electrically connected to the drain electrode or the source electrode, thereby forming a diode structure or a self-biased structure.

[0023] In at least one first thin film transistor among the plurality of thin film transistors, the first active layer may be electrically connected to the display driving circuit through respective voltage control wirings, and receive the active control voltage from the display driving circuit in units of predetermined periods.

[0024] The display driving circuit can change the voltage of the active control voltage in direct proportion or inverse proportion to the change in the temperature of the display panel or the external temperature, and supply the active control voltage with changed voltage to the first active layer of the first thin film transistor through the voltage control wiring.

[0025] The display device according to an embodiment of the present invention can minimize the influence caused by the change of touch usage temperature by improving the size of the switching element and the electrode connection structure of each image display pixel, thereby reducing the brightness deviation of the image display pixel.

[0026] Furthermore, the display device according to an embodiment can adjust the amount of voltage or current supplied to a switching element of an image display pixel according to a change in operating temperature, thereby maintaining or further improving image display quality.

[0027] Effects according to the embodiment are not limited to the contents of the above examples, and more various effects are included in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a plan view showing the structure of a display device according to an embodiment of the present invention.

[0029] Figure 2 It specifically shows Figure 1 A side sectional view of a display device.

[0030] Figure 3 FIG. 1 is a layout diagram schematically showing an example of a display panel according to an embodiment.

[0031] Figure 4 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of a first embodiment of an arbitrary pixel of a display panel shown.

[0032] Figure 5 It shows Figure 4 The layout diagram shows the arrangement shapes of the second thin film transistor and the third thin film transistor.

[0033] Figure 6 is a timing diagram showing waveform changes of pixel driving control signals according to an embodiment.

[0034] Figure 7 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of a second embodiment of an arbitrary pixel of a display panel shown.

[0035] Figure 8 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of an arbitrary pixel of a display panel according to the third embodiment.

[0036] Figure 9 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of an arbitrary pixel of a display panel according to the fourth embodiment.

[0037] Figure 10 is shown as supplied to Figure 8 FIG. 1 is a graph showing a first embodiment of the correlation between the active control voltage of the active layer of the second thin film transistor and the temperature.

[0038] Figure 11 is shown as supplied to Figure 9 FIG. 1 is a graph showing a second embodiment of the correlation between the active control voltage of the active layer of the second thin film transistor and the temperature.

[0039] Figure 12 and Figure 13 3D is a perspective view showing an application example of a display device according to an embodiment of the present invention.

[0040] Figure 14 and Figure 15 This is a perspective view showing an application example of a display device according to still another embodiment of the present invention.

[0041] Description of Reference Numerals

[0042] 10: Display device

[0043] 100: Display panel

[0044] 200: Display driver circuit

[0045] 210: Gate drive unit

[0046] 300: Circuit board

[0047] 400: Touch drive circuit DETAILED DESCRIPTION

[0048] The advantages, features, and methods for achieving these advantages and features of the present invention will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms. These embodiments are provided solely to complete the disclosure of the present invention and to fully inform those with ordinary knowledge in the technical field to which the present invention relates of the scope of the present invention. The present invention is defined solely by the scope of the claims.

[0049] When an element or layer is referred to as being "on" another element or layer, this includes all instances where the other layer or element is directly above or interposed between the other element or layer. Throughout this specification, the same reference numerals refer to the same components. The shapes, sizes, ratios, angles, quantities, and the like disclosed in the drawings used to illustrate the embodiments are illustrative only, and the present invention is not limited to the matters illustrated.

[0050] Although the terms "first," "second," and so on are used to describe various components, these components are clearly not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below can also be the second component within the technical concept of the present invention.

[0051] The various features of the various embodiments of the present invention can be partially or completely combined or combined with each other, and can be technically linked and driven in various ways. The various embodiments can be implemented independently of each other, or can be implemented together through an associated relationship.

[0052] Hereinafter, specific embodiments will be described with reference to the accompanying drawings.

[0053] Figure 1 1 is a plan view showing the structure of a display device according to an embodiment of the present invention. Figure 2 It specifically shows Figure 1A side sectional view of a display device.

[0054] Reference Figure 1 and Figure 2 The display device 10 according to one embodiment can be applied to portable electronic devices such as tablet PCs (Tablet Personal Computers), portable multimedia players (PMPs), navigation systems, ultra-mobile PCs (UMPCs), e-books, electronic organizers, mobile phones, smartphones, and mobile communication terminals. For example, the display device 10 can be used as a display portion of a television, laptop computer, monitor, billboard, or Internet of Things (IoT) device.

[0055] The display device 10 according to one embodiment can be categorized into various types based on display methods. For example, the display device 10 can be categorized and configured as an organic light-emitting diode display (OLED), an inorganic light-emitting display (inorganic EL), a quantum dot light-emitting display (QED), a micro-LED display (micro-LED), a nano-LED display (nano-LED), a plasma display (PDP), a field emission display (FED), a liquid crystal display (LCD), an electrophoretic display (EPD), and the like. Below, the display device 10 according to one embodiment is described using an organic light-emitting diode display (OLED) as an example. Unless otherwise specified, the organic light-emitting diode display (OLED) used in this embodiment is simply referred to as the display device 10. The display device 10 according to this embodiment is not limited to an organic light-emitting diode display (OLED). Within the scope of sharing the same technical concepts, the display device 10 can also be applied to other display devices listed above or other display devices known in the art.

[0056] The display device 10 according to one embodiment may have a rectangular, square, circular, elliptical, or square shape in plan view. For example, if the display device 10 is a mobile device such as a tablet PC, it may have a rectangular shape with its long side oriented horizontally. However, this is not limiting. The long side may also be oriented vertically, or the display device may be rotatable so that its long side can be variably oriented horizontally or vertically.

[0057] The display device 10 includes a display panel 100 , a display driving circuit 200 , and a touch sensing module including a touch sensing unit TSU and a touch driving circuit 400 .

[0058] Specifically, the display panel 100 of the display device 10 includes a display unit DU for displaying images and a substrate SUB. A touch sensing unit TSU for sensing touches by a human body part such as a finger or an electronic pen is disposed on the display panel 100. In the display unit DU of the display panel 100, a plurality of pixels SP are formed in a predetermined arrangement, and images are displayed by the plurality of pixels SP.

[0059] The touch sensing unit TSU may be mounted on the front surface of the display panel 100 or may be integrally formed with the display panel 100. The touch sensing unit TSU includes a plurality of touch electrodes, thereby sensing a user's touch using capacitance of the touch electrodes.

[0060] The display driving circuit 200 may output a data voltage and a pixel driving control signal for driving a plurality of pixels SP arranged in the display unit DU. The display driving circuit 200 may output a data voltage and a pixel driving control signal to a data wiring DL (refer to FIG. Figure 3 ) supplies data voltage. The display driving circuit 200 can supply data voltage to the power supply wiring VL (refer to Figure 3 ) supplies a power supply voltage, supplies a gate control signal to the gate driving unit 210, and supplies a pixel driving control signal to the plurality of pixels SP.

[0061] In addition, the display driving circuit 200 may supply an active control voltage that changes in direct proportion or in inverse proportion to a temperature change of the display panel 100 to at least one thin film transistor included in the plurality of pixels SP.

[0062] Characteristics such as the threshold voltage and mobility of the thin-film transistor included in each pixel SP may change depending on changes in the temperature of the display panel 100 or the external temperature. For example, the threshold voltage and mobility characteristics of the transistor may increase or decrease in proportion to changes in the temperature of the display panel 100. In this case, the amount of current driving the light-emitting element of each pixel SP may vary, and this may cause brightness deviation. To minimize the impact of temperature changes in the display panel 100, the display driver circuit 200 supplies an active control voltage to at least one thin-film transistor included in each pixel SP that changes in direct proportion or inverse proportion to the temperature change of the display panel 100.

[0063] The touch drive circuit 400 may be electrically connected to or coupled to the touch sensing unit TSU. The touch drive circuit 400 may supply touch drive signals to the plurality of touch electrodes arranged in the touch sensing unit TSU and may sense changes in capacitance between the plurality of touch electrodes. Based on the changes in capacitance between the plurality of touch electrodes, the touch drive circuit 400 may calculate whether a user touch input has occurred and the touch coordinates.

[0064] In addition, the display driver circuit 200 can operate as a main processor or can be integrated with the main processor. Thus, the display driver circuit 200 can control the overall function of the display device 10. For example, the display driver circuit 200 can receive touch data from the touch driver circuit 400 and determine the user's touch coordinates, and then generate digital video data based on the touch coordinates. In addition, the display driver circuit 200 can run an application indicated by an icon displayed at the user's touch coordinates. As another example, the display driver circuit 200 can receive coordinate data from an electronic pen, etc. and determine the touch coordinates of the electronic pen, and then generate digital video data based on the touch coordinates, or it can also run an application indicated by an icon displayed at the touch coordinates of the electronic pen.

[0065] Reference Figure 2 The display panel 100 can be divided into a main area MA and sub-areas SBA. The main area MA may include a display area DA, which is equipped with pixels SP that display images, and a non-display area NDA, which is arranged around the display area DA. In the display area DA, light is emitted from the light-emitting area or opening area of ​​each pixel SP to display an image. To this end, the pixels SP in the display area DA may include pixel circuits including switching elements (e.g., thin-film transistors); pixel definition films that define the light-emitting area or opening area; and self-light emitting elements (SLEs).

[0066] The non-display area NDA may be any outer region or outer area of ​​the display area DA. The non-display area NDA may be defined as an edge region of the main area MA of the display panel 100. A directional gate wiring GL (see FIG. 1 ) may be formed in the non-display area NDA. Figure 3 ) The gate driver 210 that supplies gate signals and the fan-out wiring FOL that connects the display driver circuit 200 and the display area DA (see Figure 3 ).

[0067] The sub-area SBA may extend from one side of the main area MA. The sub-area SBA may comprise a flexible material capable of bending, folding, rolling, and the like. For example, if the sub-area SBA is bent, the sub-area SBA may overlap with the main area MA in the thickness direction (Z-axis direction). The sub-area SBA may include a pad portion connected to the display driver circuit 200 and the circuit board 300. Optionally, the sub-area SBA may be omitted, and the display driver circuit 200 and the pad portion may be arranged in the non-display area NDA.

[0068] At least one display driver circuit 200 can be formed as an integrated circuit (IC) and mounted on the display panel 100 via a chip-on-glass (COG) method, a chip-on-plastic (COP) method, or ultrasonic bonding. For example, the display driver circuit 200 can be arranged in the sub-area SBA and can overlap with the main area MA in the thickness direction (Z-axis direction) by bending the sub-area SBA. As another example, the display driver circuit 200 can be mounted on the circuit board 300.

[0069] The circuit board 300 can be electrically connected to the pads of the display panel 100 via an anisotropic conductive film (ACF). To this end, the wiring of the circuit board 300 can be electrically connected to the pads of the display panel 100. The circuit board 300 can be a flexible printed circuit board (FPCB), a rigid printed circuit board (RPCB), or a flexible film such as chip on film (CIF).

[0070] The substrate SUB of the display panel 100 may be a base substrate or a base component. The substrate SUB may be a flexible substrate capable of bending, folding, or rolling. For example, the substrate SUB may be made of glass or metal, but is not limited thereto. As another example, the substrate SUB may be made of a polymer resin such as polyimide (PI).

[0071] The display unit DU may include a thin film transistor layer TFTL, a light emitting element layer EML, and an encapsulation layer TFEL. The thin film transistor layer TFTL may be disposed on a substrate SUB. The thin film transistor layer TFTL may include a plurality of thin film transistors constituting a pixel circuit of a sub-pixel SP. The thin film transistor layer TFTL may also include a gate wiring GL (refer to Figure 3 )、Data wiring DL (refer to Figure 3 )、Power supply wiring VL(Refer to Figure 3 )、gate control wiring GCL (refer to Figure 3 ), connecting the display driving circuit 200 and the data wiring DL (refer to Figure 3 ) fan-out wiring FOL (refer to Figure 3) and lead wiring connecting the display driving circuit 200 and the pad portion. In the case where the gate driving portion 210 is formed on one side of the non-display area NDA of the display panel 100, the gate driving portion 210 may also include a thin film transistor.

[0072] The thin film transistor layer TFTL may be arranged in the display area DA, the non-display area NDA, and the sub-area SBA. The thin film transistors of each pixel of the thin film transistor layer TFTL, the gate wiring GL (refer to Figure 3 )、Data wiring DL (refer to Figure 3 ) and power supply wiring VL (refer to Figure 3 ) may be arranged in the display area DA. The gate control wiring GCL (refer to Figure 3 ) and fan-out wiring FOL (refer to Figure 3 ) may be arranged in the non-display area NDA. Lead wirings of the thin film transistor layer TFTL may be arranged in the sub-area SBA.

[0073] The light-emitting element layer (EML) may be disposed on the thin film transistor layer (TFTL). The light-emitting element layer (EML) may include a plurality of light-emitting elements that emit light by sequentially stacking a first electrode, a light-emitting layer, and a second electrode, and a pixel definition film that defines pixels. The plurality of light-emitting elements of the light-emitting element layer (EML) may be disposed in the display area (DA).

[0074] The encapsulation layer TFEL may cover the upper surface and side surfaces of the light emitting element layer EML and may protect the light emitting element layer EML. The encapsulation layer TFEL may include at least one inorganic film and at least one organic film for encapsulating the light emitting element layer EML.

[0075] The touch sensing unit TSU can be disposed on the encapsulation layer TFEL. The touch sensing unit TSU may include: multiple touch electrodes for capacitively sensing a user's touch; and touch wiring connecting the multiple touch electrodes to the touch drive circuit 400. For example, the touch sensing unit TSU may sense a user's touch using self-capacitance or mutual capacitance.

[0076] As another example, the touch sensing unit TSU may be disposed on a separate substrate disposed on the display unit DU. In this case, the substrate supporting the touch sensing unit TSU may be a base component that packages the display unit DU.

[0077] The plurality of touch electrodes included in the touch sensing part TSU may be arranged in a touch sensing area overlapping with the display area DA, and the touch wirings of the touch sensing part TSU may be arranged in a touch peripheral area overlapping with the non-display area NDA.

[0078] The touch drive circuit 400 can be mounted on a separate circuit board 300. The touch drive circuit 400 can be formed as an integrated circuit (IC). As described above, the touch drive circuit 400 applies touch drive signals to the touch electrodes of the touch sensing unit TSU. Furthermore, the touch drive circuit 400 measures the charge change in the mutual capacitance of each touch node formed in the intersection of the multiple touch electrodes. Specifically, the touch drive circuit 400 measures the capacitance change of the touch node based on the voltage or current change of the touch sensing signal received by the touch electrode. In this way, the touch drive circuit 400 can determine whether a user has touched or is in proximity based on the charge change in the mutual capacitance of each touch node. The touch drive signal can be a pulse signal with a predetermined frequency. Based on the capacitance change between the multiple touch electrodes, the touch drive circuit 400 calculates the presence of a touch input and the touch coordinates of a user's body part, such as a finger.

[0079] More specifically, the touch drive circuit 400 can sequentially supply touch drive signals to a plurality of touch electrodes arranged in a cross-section in the touch sensing unit TSU, and can sequentially measure the charge changes of the capacitances of a plurality of touch nodes formed by the intersection of the plurality of touch electrodes, thereby detecting whether the user touches or not.

[0080] Figure 3 Schematically shows a layout diagram of an example of a display panel according to an embodiment. Specifically, Figure 3 1 is a layout diagram showing the display area DA and the non-display area NDA of the display unit DU in a state before the touch sensing unit TSU is formed.

[0081] The display area DA, as an area for displaying an image, may be defined as the central area of ​​the display panel 100. The display area DA may include a plurality of pixels SP, a plurality of gate wirings GL, a plurality of data wirings DL, and a plurality of power wirings VL. Each of the plurality of sub-pixels SP may be defined as a minimum unit for outputting light.

[0082] The plurality of gate wirings GL may supply scan signals or gate signals received from the gate driving part 210 to the plurality of pixels SP. The plurality of gate wirings GL may extend in the X-axis direction and may be spaced apart from each other in the Y-axis direction crossing the X-axis direction.

[0083] The plurality of data wirings DL may supply the plurality of pixels SP with data voltages received from the display driving circuit 200. The plurality of data wirings DL may extend in the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0084] Furthermore, a plurality of control wirings, such as light emission control wirings and initialization wirings, may be formed in the display area DA so that pixel drive control signals, such as light emission control signals or initialization signals, received from the display driver circuit 200 can be supplied to the plurality of pixels SP. Such control wirings may extend in the Y-axis direction in the display area DA and may be spaced apart from each other in the X-axis direction.

[0085] In addition, the plurality of power supply wirings VL can supply a high potential power supply voltage and a low potential power supply voltage received from the display driving circuit 200 to the plurality of sub-pixels SP. Here, the power supply voltage may be at least one of a high potential driving voltage and a low potential driving voltage, an initialization voltage, and a reference voltage. The plurality of power supply wirings VL may extend along the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0086] The non-display area NDA may surround the display area DA. The non-display area NDA may include a gate driver 210, fan-out wiring FOL, and gate control wiring GCL. The gate driver 210 may generate multiple gate signals based on the gate control signal and may sequentially supply the multiple gate signals to the multiple gate wirings GL in a set order.

[0087] The fan-out wiring FOL may extend from the display driving circuit 200 to the display area DA. The fan-out wiring FOL may supply a data voltage received from the display driving circuit 200 to the plurality of data wirings DL.

[0088] The gate control wiring GCL may extend from the display driving circuit 200 to the gate driving part 210. The gate control wiring GCL may supply the gate driving part 210 with a gate control signal received from the display driving circuit 200.

[0089] The display driver circuit 200 can supply a data voltage to the data wiring DL via the fan-out wiring FOL. The data voltage can be supplied to the plurality of sub-pixels SP and can determine the brightness of the plurality of sub-pixels SP. The display driver circuit 200 can supply a gate control signal to the gate driver 210 via the gate control wiring GCL. Furthermore, the display driver circuit 200 can supply pixel drive control signals to each control wiring via a separate fan-out wiring FOL connected to the control wiring of the display area DA.

[0090] Figure 4 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of a first embodiment of an arbitrary pixel of a display panel shown.

[0091] Reference Figure 4Each pixel SP arranged in the display area DA can be constructed using a 6T (transistor) 2C (capacitor) type circuit, including first to sixth thin-film transistors T1 to T6, a light-emitting element LEL, and a first capacitor Cst and a second capacitor C. In a 6T2C type pixel circuit, the first thin-film transistor T1 functions as a drive transistor DT that drives the light-emitting element LEL. Alternatively, each pixel SP can be constructed using a 7T2C type circuit, including first to sixth thin-film transistors T1 to T6, a separate drive transistor DT, a light-emitting element LEL, and a first capacitor Cst and a second capacitor Cst. As an example, the structure of a 6T2C type pixel SP will be described below.

[0092] Figure 4 The 6T2C type pixel SP shown can be connected to a first scan wiring supplied with a first scan signal GWS, a second scan wiring supplied with a second scan signal GRS, an initialization wiring supplied with an initialization signal GCS, an enable control wiring supplied with an enable signal EMS signal, and a light emitting control wiring supplied with a light emitting control signal VLS.

[0093] In addition, each pixel SP may be connected to a first driving voltage wiring supplied with a first driving voltage VDD, an initialization voltage wiring supplied with an initialization voltage Vinit, a reference voltage wiring supplied with a reference voltage Vref, and a second driving voltage wiring supplied with a second driving voltage VSS.

[0094] The first thin-film transistor T1 functions as a driving transistor (DT) that drives the light-emitting element (LEL). The first thin-film transistor T1 controls the drain-source current (Ids, hereinafter referred to as the "driving current") flowing between the first and second electrodes based on a data voltage applied to the gate electrode via the second thin-film transistor T2. As shown in Equation 1, the driving current (Ids) flowing through the channel of the first thin-film transistor T1 is proportional to the square of the difference between the voltage (Vgs) between the gate and source electrodes of the first thin-film transistor T1 and its threshold voltage.

[0095] [Mathematical formula 1]

[0096]

[0097] In Mathematical Formula 1, k′ represents a proportionality coefficient determined by the structure and physical characteristics of the first thin film transistor T1 , Vgs represents a gate-source voltage of the first thin film transistor T1 , and Vth represents a threshold voltage of the first thin film transistor T1 .

[0098] The light emitting element LEL emits light according to the driving current (Ids) input through the first thin film transistor T1. The amount of light emitted by the light emitting element LEL may be proportional to the driving current (Ids).

[0099] The light-emitting element LEL may be an organic light-emitting diode comprising an anode electrode, a cathode electrode, and an organic light-emitting layer disposed between the anode and cathode electrodes. Alternatively, the light-emitting element LEL may be an inorganic light-emitting element comprising an anode electrode, a cathode electrode, and an inorganic semiconductor disposed between the anode and cathode electrodes. Alternatively, the light-emitting element LEL may be a quantum dot light-emitting element comprising an anode electrode, a cathode electrode, and a quantum dot light-emitting layer disposed between the anode and cathode electrodes. Alternatively, the light-emitting element LEL may be a micro light-emitting diode.

[0100] The anode electrode of the light emitting element LEL is connected to the first electrode of the fourth thin film transistor T4 and the second electrode of the sixth thin film transistor T6, and the cathode electrode is connected to the second driving voltage VSS wiring. A second capacitor C is formed between the anode electrode and the cathode electrode of the light emitting element LEL according to parasitic capacitance.

[0101] The second thin film transistor T2 is turned on by the first scan signal GWS of the first scan line, so that the gate electrode of the first thin film transistor T1 is connected to the data line DL.

[0102] The gate electrode of the second thin film transistor T2 may be connected to the first scan line, the first electrode may be connected to the gate electrode of the drive transistor DT, and the second electrode may be connected to the data line DL. Thus, a first contact node Nd is formed at the connection between the first electrode of the second thin film transistor T2 and the gate electrode of the first thin film transistor T1.

[0103] The third thin-film transistor T3 is turned on by the second scan signal GRS of the second scan wiring, thereby connecting the gate electrode of the first thin-film transistor T1 to the reference voltage wiring. The gate electrode of the third transistor T3 can be connected to the second scan wiring, the first electrode of the third thin-film transistor T3 can be connected to the gate electrode of the first thin-film transistor T1, and the second electrode can be connected to the reference voltage wiring. By turning on the third thin-film transistor T3 in response to the second scan signal GRS, the first contact node Nd and the gate electrode of the first thin-film transistor T1 can drop to the reference voltage Vref of the reference voltage wiring.

[0104] The fourth thin-film transistor T4 is turned on by an initialization signal GCS from the initialization wiring, thereby connecting the anode electrode of the light-emitting element LEL to the initialization voltage wiring. The gate electrode of the fourth thin-film transistor T4 is connected to the initialization wiring, the first electrode is connected to the anode electrode of the light-emitting element LEL, and the second electrode is connected to the initialization voltage wiring. By turning on the fourth thin-film transistor T4 in response to the initialization signal GCS, the anode electrode of the light-emitting element LEL can be discharged to the initialization voltage Vinit.

[0105] The fifth thin-film transistor T5 is turned on by an enable signal EMS from the enable control wiring, thereby connecting the first electrode of the first thin-film transistor T1 to the first drive voltage wiring. The gate electrode of the fifth thin-film transistor T5 is connected to the enable control wiring, the first electrode is connected to the first drive voltage wiring, and the second electrode is connected to the first electrode of the first thin-film transistor T1. By turning on the fifth thin-film transistor T5 in response to the enable signal EMS, the first drive voltage VDD is supplied to the first electrode of the first thin-film transistor T1.

[0106] The sixth thin-film transistor T6 is connected between the second electrode of the first thin-film transistor T1 and the anode electrode of the light-emitting element LEL. The sixth thin-film transistor T6 is turned on by a light-emission control signal VLS from the light-emission control wiring, thereby connecting the second electrode of the first thin-film transistor T1 to the anode electrode of the light-emitting element LEL. The sixth thin-film transistor T6 has a gate electrode connected to the light-emission control wiring, a first electrode connected to the second electrode of the first thin-film transistor T1, and a second electrode connected to the anode electrode of the light-emitting element LEL. When both the fifth thin-film transistor T5 and the sixth thin-film transistor T6 are turned on, a drive current (Ids) can be supplied to the light-emitting element LEL.

[0107] The first capacitor Cst is formed between the gate electrode of the first thin film transistor T1 and the second electrode of the first thin film transistor T1. Alternatively, the first capacitor Cst may be formed between the gate electrode of the first thin film transistor T1 and the first driving voltage wiring.

[0108] When the first electrode of each of the first to sixth thin film transistors T1 to T6 is a source electrode, the second electrode may be a drain electrode. Alternatively, when the first electrode of each of the first to sixth thin film transistors T1 to T6 is a drain electrode, the second electrode may be a source electrode.

[0109] The active layer of each of the first to sixth thin film transistors T1 to T6 may be formed using one of polysilicon, amorphous silicon, and an oxide semiconductor. Figure 4In the description, the first to sixth thin film transistors T1 to T6 are mainly formed by N-type MOSFETs, but the present invention is not limited thereto. For example, the first to sixth thin film transistors T1 to T6 may also be formed by P-type MOSFETs.

[0110] The magnitudes of the first driving voltage VDD of the first driving voltage wiring, the second driving voltage VSS of the second driving voltage wiring, the reference voltage Vref of the reference voltage wiring, and the initialization voltage Vinit of the initialization voltage wiring can be set differently in consideration of the characteristics of the driving transistor DT, the characteristics of the light-emitting element LEL, etc. For example, the voltage difference between the initialization voltage Vinit and the data voltage supplied to the source electrode of the driving transistor DT can be set to be smaller than the threshold voltage of the first thin film transistor T1.

[0111] Figure 5 It shows Figure 4 The layout diagram shows the arrangement shapes of the second thin film transistor and the third thin film transistor.

[0112] Reference Figure 5 At least one thin film transistor T2 among the first to sixth thin film transistors T1 to T6 includes: a gate electrode G; a first active layer ACT1, which covers the gate electrode G with a preset first planar area size and is patterned; a source electrode SS, which is formed to cover the gate electrode G and a portion of the first active layer ACT1 that overlaps with the gate electrode G; and a drain electrode DD, which is formed in a direction opposite to the source electrode SS to cover the gate electrode G and a portion of the first active layer ACT1 that overlaps with the gate electrode G.

[0113] For example, the first active layer ACT1 of the second thin-film transistor T2 is formed to cover the gate electrode G extending from the gate line GL with a predetermined first planar area. Furthermore, the source electrode SS of the second thin-film transistor T2 is formed to have one side electrically connected to the data line DL and the other side covering a portion of the first active layer ACT1 that overlaps with the gate electrode G. Thus, the drain electrode DD of the second thin-film transistor T2 is formed to have one side covering the gate electrode G and a portion of the first active layer ACT1 that overlaps with the gate electrode G and the other side electrically connected to the first contact node Nd of the first thin-film transistor T1.

[0114] At least one other thin film transistor T1, T3, T4, T5, T6 among the first to sixth thin film transistors T1 to T6 includes: a gate electrode G; a second active layer ACT2, which covers the gate electrode G with a preset second planar area size and is patterned; a source electrode SS, which is formed to cover the gate electrode G and a portion of the second active layer ACT2 that overlaps with the gate electrode G; and a drain electrode DD, which is formed in a direction opposite to the source electrode SS to cover a portion of the gate electrode G and the second active layer ACT2 that overlaps with the gate electrode G.

[0115] For example, the second active layer ACT2 of the third thin-film transistor T3 is formed to cover the gate electrode G extending from the second scan wiring GRL with a predetermined second planar area. Furthermore, the source electrode SS of the third thin-film transistor T3 is formed to have one side electrically connected to the reference voltage supply wiring LVref and the other side covering a portion of the second active layer ACT2 that overlaps with the gate electrode G. Thus, the drain electrode DD of the third thin-film transistor T3 is formed to have one side covering the gate electrode G and a portion of the second active layer ACT2 that overlaps with the gate electrode G and the other side electrically connected to the first contact node Nd of the first thin-film transistor T1. Here, the first planar area of ​​the first active layer ACT1 formed on at least one thin-film transistor T2 can be larger or wider than the second planar area of ​​the second active layer ACT2 formed on at least one other thin-film transistor T1, T3, T4, T5, or T6.

[0116] In addition, the height or thickness of the first active layer ACT1 formed in at least one thin film transistor T2 can be formed to be higher or thicker than the height or thickness of the second active layer ACT2 formed in at least one other thin film transistor T1, T3, T4, T5, T6.

[0117] In addition, the width in at least one direction of the first active layer ACT1 formed on at least one thin film transistor T2 can be formed to be wider than the width in at least one direction of the second active layer ACT2 formed on at least one other thin film transistor T1, T3, T4, T5, T6.

[0118] Figure 6 is a timing diagram showing waveform changes of pixel driving control signals according to an embodiment.

[0119] Figure 6 Pixel driving control signals (ie, a first scan signal GWS, a second scan signal GRS, an initialization signal GCS, an enable signal EMS, and a light emitting control signal VLS) supplied to each pixel SP during pixel row driving in units of horizontal lines (or horizontal rows) are shown.

[0120] Each pixel SP is driven during each pixel row drive period based on the waveform and supply timing of the pixel drive control signal supplied during each horizontal line pixel row drive period. The pixel row drive period, which is divided into an on-bias stress period (OBS), an initialization drive period (Ti), a sampling period (Sampling) (Ts), a data writing period (Tm), and a photoluminescence period (Emission) (Te). Thus, the pixels SP, which are supplied in units of horizontal lines, are driven sequentially during each pixel row drive period.

[0121] Figure 7 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of a second embodiment of an arbitrary pixel of a display panel shown.

[0122] Reference Figure 5 and Figure 7 At least one of the multiple thin-film transistors T1, T2, T3, T4, T5, and T6 in each pixel SP (e.g., the second thin-film transistor T2) can be formed into a diode structure or a self-biased structure, in which the first active layer ACT1 is electrically connected to the drain electrode DD or the source electrode SS. In other words, the first active layer ACT1 of the second thin-film transistor T2 can be electrically connected to the first contact node Nd of the second thin-film transistor T2.

[0123] The second thin film transistor T2 may also be formed in a diode structure or a self-biased structure with the gate electrode G electrically connected to the drain electrode DD or the source electrode SS. In other words, the gate electrode G of the second thin film transistor T2 may be electrically connected to the first contact node Nd of the second thin film transistor T2.

[0124] In the second thin film transistor T2 formed in a diode structure or a self-biased structure, the voltage of the first active layer ACT1 or the gate electrode G remains the same as the voltage of the first contact node Nd, thereby reducing the voltage drop of the first active layer ACT1 caused by temperature changes.

[0125] Figure 8 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of an arbitrary pixel of a display panel according to the third embodiment.

[0126] Reference Figure 5 and Figure 8 The first active layer ACT1 of at least one thin film transistor (eg, the second thin film transistor T2 ) among the plurality of thin film transistors T1 , T2 , T3 , T4 , T5 , and T6 of each pixel SP is electrically connected to the display driving circuit 200 through a voltage control wiring.

[0127] The display driving circuit 200 supplies an active control voltage Vctl to the first active layer ACT1 of the second thin film transistor T2 through the voltage control wiring.

[0128] The first active layer ACT1 of the second thin film transistor T2 receives the active control voltage Vctl from the display driving circuit 200 in units of predetermined periods. The voltage of the first active layer ACT1 can be maintained at the level of the active control voltage Vctl in units of predetermined periods. Accordingly, the voltage of the first active layer ACT1 of the second thin film transistor T2 is maintained at the level of the active control voltage Vctl in each predetermined period, thereby preventing a voltage drop in the first active layer ACT1 caused by temperature changes.

[0129] Figure 9 It is aimed at Figure 3 FIG. 1 is an equivalent circuit diagram of an arbitrary pixel of a display panel according to the fourth embodiment.

[0130] Reference Figure 9 Each pixel SP may include a light emitting element LEL and a pixel circuit that controls the amount of light emitted by the light emitting element LEL, and the pixel circuit may be formed as a 7T2C type.

[0131] The 7T2C pixel circuit may include a driving transistor DT and first to sixth thin film transistors T1 to T6. The first to sixth thin film transistors T1 to T6 and the driving transistor DT may be formed by P-type MOSFETs. Alternatively, the first to sixth thin film transistors T1 to T6 and the driving transistor DT may be formed by N-type MOSFETs.

[0132] Figure 10 is shown as supplied to Figure 8 FIG. 1 is a graph showing a first embodiment of the correlation between the active control voltage of the active layer of the second thin film transistor and the temperature.

[0133] like Figure 8 As shown, at least one thin film transistor (for example, the second thin film transistor T2 ) among the plurality of thin film transistors T1 , T2 , T3 , T4 , T5 , and T6 of each pixel SP may be formed of an N-type MOSFET.

[0134] In addition, the display driving circuit 200 may receive a temperature value of the display panel 100 or an external temperature value (or temperature data) in real time through a temperature detection sensor module or the like formed in the display panel 100 .

[0135] In the case where the second thin film transistor T2 is formed of an N-type MOSFET, as shown in FIG. Figure 10As shown, the display driving circuit 200 changes the voltage of the active control voltage Vctl in inverse proportion to the change in the temperature of the display panel 100 or the external temperature, and supplies the active control voltage Vctl with changed voltage to the first active layer ACT1 of the second thin film transistor T2 through the voltage control wiring.

[0136] The display driving circuit 200 increases the active control voltage Vctl as the temperature of the display panel 100 or the external temperature decreases, and decreases the active control voltage Vctl as the temperature of the display panel 100 or the external temperature increases, thereby minimizing the change in the voltage of the first active layer ACT1 of the second thin film transistor T2 corresponding to the temperature change.

[0137] Figure 11 is shown as supplied to Figure 9 FIG. 1 is a graph showing a second embodiment of the correlation between the active control voltage of the active layer of the second thin film transistor and the temperature.

[0138] like Figure 9 As shown, at least one thin film transistor (for example, the second thin film transistor T2 ) among the plurality of thin film transistors T1 , T2 , T3 , T4 , T5 , and T6 of each pixel SP may be formed of a P-type MOSFET.

[0139] In the case where the second thin film transistor T2 is formed of a P-type MOSFET, as shown in FIG. Figure 11 As shown, the display driving circuit 200 changes the voltage of the active control voltage Vctl in proportion to the change in the temperature of the display panel 100 or the external temperature, and supplies the active control voltage Vctl with changed voltage to the first active layer ACT1 of the second thin film transistor T2 through the voltage control wiring.

[0140] The display driving circuit 200 reduces the active control voltage Vctl as the temperature of the display panel 100 or the external temperature decreases, and increases the active control voltage Vctl as the temperature of the display panel 100 or the external temperature increases, thereby minimizing the change in the voltage of the first active layer ACT1 of the second thin film transistor T2 corresponding to the temperature change.

[0141] Figure 12 and Figure 13 3D is a perspective view showing an application example of a display device according to an embodiment of the present invention.

[0142] exist Figure 12 and Figure 13, an example of a display device 10 used as a foldable display device that is foldable in a first direction (X-axis direction) is shown. The display device 10 can maintain both a folded state and an unfolded state. The display device 10 can be folded in an in-folding manner with the front surface arranged on the inside. When the display device 10 is bent or folded in the in-folding manner, the front surfaces of the display device 10 can be arranged to face each other. Alternatively, the display device 10 can be folded in an out-folding manner with the front surface arranged on the outside. When the display device 10 is bent or folded in the out-folding manner, the rear surfaces of the display device 10 can be arranged to face each other.

[0143] The first unfolding area NFA1 may be located on one side (e.g., the right side) of the folding area FDA. The second unfolding area NFA2 may be located on the other side (e.g., the left side) of the folding area FDA. A touch sensing unit TSU according to an embodiment of the present disclosure may be formed and arranged on each of the first unfolding area NFA1 and the second unfolding area NFA2.

[0144] The first folding line FOL1 and the second folding line FOL2 can extend along the second direction (Y-axis direction), and the display device 10 can be folded in the first direction (X-axis direction). As a result, the length of the display device 10 in the first direction (X-axis direction) can be reduced to approximately half, making it convenient for the user to carry the display device 10.

[0145] Furthermore, the extending directions of the first folding line FOL1 and the second folding line FOL2 are not limited to the second direction (Y-axis direction). For example, the first folding line FOL1 and the second folding line FOL2 may extend along the first direction (X-axis direction), and the display device 10 may be folded in the second direction (Y-axis direction). In this case, the length of the display device 10 in the second direction (Y-axis direction) can be reduced to approximately half. Alternatively, the first folding line FOL1 and the second folding line FOL2 may extend along a diagonal direction of the display device 10, which corresponds to a direction between the first direction (X-axis direction) and the second direction (Y-axis direction). In this case, the display device 10 can be folded into a triangular shape.

[0146] When the first folding line FOL1 and the second folding line FOL2 extend in the second direction (Y-axis direction), the length of the folding area FDA in the first direction (X-axis direction) can be shorter than the length in the second direction (Y-axis direction). Furthermore, the length of the first non-folding area NFA1 in the first direction (X-axis direction) can be longer than the length of the folding area FDA in the first direction (X-axis direction). The length of the second non-folding area NFA2 in the first direction (X-axis direction) can be longer than the length of the folding area FDA in the first direction (X-axis direction).

[0147] The first display area DA1 may be arranged on the front surface of the display device 10. The first display area DA1 may overlap with the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2. Therefore, when the display device 10 is unfolded, an image may be displayed from the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2 of the display device 10 toward the front surface.

[0148] The second display area DA2 may be disposed on the rear surface of the display device 10. The second display area DA2 may overlap with the second non-folding area NFA2. Therefore, when the display device 10 is folded, an image may be displayed from the second non-folding area NFA2 toward the front surface of the display device 10.

[0149] exist Figure 12 and Figure 13 , the through hole TH having the camera SDA and the like formed therein is arranged in the first unfolding area NFA1 , but the present invention is not limited thereto. The through hole TH or the camera SDA may be arranged in the second unfolding area NFA2 or the folding area FDA.

[0150] Figure 14 and Figure 15 It is a perspective view showing an application example of a display device according to still another embodiment of the present invention.

[0151] exist Figure 14 and Figure 15 , an example of a display device 10 used as a foldable display device that folds in the second direction (Y-axis direction) is shown. The display device 10 can maintain both a folded state and an unfolded state. The display device 10 can be folded in an in-folding manner with the front surface arranged on the inner side. When the display device 10 is bent or folded in the in-folding manner, the front surfaces of the display device 10 can be arranged to face each other. Alternatively, the display device 10 can be folded in an out-folding manner with the front surface arranged on the outer side. When the display device 10 is bent or folded in the out-folding manner, the rear surfaces of the display device 10 can be arranged to face each other.

[0152] The display device 10 may include a folding area FDA, a first unfolding area NFA1, and a second unfolding area NFA2. The folding area FDA may be a foldable area of ​​the display device 10, while the first and second unfolding areas NFA1 and NFA2 may be unfolded areas of the display device 10. The first unfolding area NFA1 may be located on one side (e.g., the lower side) of the folding area FDA. The second unfolding area NFA2 may be located on the other side (e.g., the upper side) of the folding area FDA.

[0153] The touch sensing parts TSU according to the embodiment of this specification may be formed and arranged on the first non-folding area NFA1 and the second non-folding area NFA2 , respectively.

[0154] On the other hand, the folding area FDA may be an area bent with a predetermined curvature at the first folding line FOL1 and the second folding line FOL2. Therefore, the first folding line FOL1 may be a boundary between the folding area FDA and the first non-folding area NFA1, and the second folding line FOL2 may be a boundary between the folding area FDA and the second non-folding area NFA2.

[0155] like Figure 14 and Figure 15 As shown, the first folding line FOL1 and the second folding line FOL2 can extend along a first direction (X-axis direction), and the display device 10 can be folded in a second direction (Y-axis direction). As a result, the length of the display device 10 in the second direction (Y-axis direction) can be reduced to approximately half, making it convenient for the user to carry the display device 10.

[0156] Furthermore, the extending directions of the first folding line FOL1 and the second folding line FOL2 are not limited to the first direction (X-axis direction). For example, the first folding line FOL1 and the second folding line FOL2 may extend along the second direction (Y-axis direction), and the display device 10 may be folded in the first direction (X-axis direction). In this case, the length of the display device 10 in the first direction (X-axis direction) can be reduced to approximately half. Alternatively, the first folding line FOL1 and the second folding line FOL2 may extend along a diagonal direction of the display device 10, which is a direction between the first direction (X-axis direction) and the second direction (Y-axis direction). In this case, the display device 10 can be folded into a triangular shape.

[0157] like Figure 14 and Figure 15 As shown, when the first folding line FOL1 and the second folding line FOL2 extend along the first direction (X-axis direction), the length of the folding area FDA in the second direction (Y-axis direction) can be shorter than the length in the first direction (X-axis direction). Furthermore, the length of the first non-folding area NFA1 in the second direction (Y-axis direction) can be longer than the length of the folding area FDA in the second direction (Y-axis direction). The length of the second non-folding area NFA2 in the second direction (Y-axis direction) can be longer than the length of the folding area FDA in the second direction (Y-axis direction).

[0158] The first display area DA1 may be arranged on the front surface of the display device 10. The first display area DA1 may overlap with the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2. Therefore, when the display device 10 is unfolded, an image may be displayed from the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2 of the display device 10 toward the front surface.

[0159] The second display area DA2 may be disposed on the rear surface of the display device 10. The second display area DA2 may overlap with the second non-folding area NFA2. Therefore, when the display device 10 is folded, an image may be displayed from the second non-folding area NFA2 toward the front surface of the display device 10.

[0160] exist Figure 14 and Figure 15 , the through hole TH having the camera SDA and the like formed therein is arranged in the second unfolding area NFA2 , but the present invention is not limited thereto. The through hole TH may be arranged in the first unfolding area NFA1 or the folding area FDA.

[0161] While the embodiments of the present invention have been described above with reference to the accompanying drawings, it will be understood by those skilled in the art that the present invention may be implemented in other specific forms without changing the technical concept or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not restrictive.

Claims

1. A display device, characterized in that: include: A plurality of pixels are arranged in a display area of ​​the display panel; as well as A display driving circuit supplies data voltages and pixel driving control signals to the plurality of pixels to control an image display operation of each of the plurality of pixels. The display driving circuit supplies an active control voltage that changes in direct proportion or in inverse proportion to a temperature change of the display panel to at least one thin film transistor included in the plurality of pixels.

2. The display device according to claim 1, wherein The plurality of pixels include a light emitting element and a pixel circuit for controlling the amount of light emitted by the light emitting element. The pixel circuit includes a plurality of thin film transistors and at least one capacitor. At least one first thin film transistor among the plurality of thin film transistors comprises: a first gate electrode; A first active layer, covering the first gate electrode with a preset first planar area and being patterned; a first source electrode formed to cover the first gate electrode and a portion of the first active layer overlapping with the first gate electrode; and The first drain electrode is formed in a direction opposite to the first source electrode to cover the first gate electrode and a portion of the first active layer overlapping with the first gate electrode.

3. The display device according to claim 2, wherein: At least one second thin film transistor among the plurality of thin film transistors comprises: a second gate electrode; a second active layer covering the second gate electrode with a preset second planar area and being patterned; a second source electrode formed to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode; and The second drain electrode is formed in a direction opposite to the second source electrode to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode.

4. The display device according to claim 3, wherein: A first planar area of ​​the first active layer is formed to be larger or wider than a second planar area of ​​the second active layer.

5. The display device according to claim 3, wherein The height or thickness of the first active layer is formed to be higher or thicker than the height or thickness of the second active layer.

6. The display device according to claim 3, wherein: The width of the first active layer in at least one direction is formed to be wider than the width of the second active layer in at least one direction.

7. The display device according to claim 2, wherein: In at least one first thin film transistor among the plurality of thin film transistors, The first active layer is electrically connected to the drain electrode or the source electrode, or the gate electrode is electrically connected to the drain electrode or the source electrode, thereby forming a diode structure or a self-bias structure.

8. The display device according to claim 2, wherein: In at least one first thin film transistor among the plurality of thin film transistors, The first active layer is electrically connected to the display driving circuit via respective voltage control wirings, and receives the active control voltage from the display driving circuit in units of predetermined periods.

9. The display device according to claim 8, wherein The display driving circuit changes the voltage of the active control voltage in inverse proportion to the temperature of the display panel or the external temperature, and supplies the active control voltage with changed voltage to the first active layer of the first thin film transistor through the voltage control wiring.

10. The display device according to claim 8, wherein The display driving circuit changes the voltage of the active control voltage in proportion to the temperature of the display panel or the external temperature, and supplies the active control voltage with the changed voltage to the first active layer of the first thin film transistor through the voltage control wiring.

11. A display device, characterized in that: include: A plurality of pixels are arranged in a display area of ​​the display panel; as well as A touch sensing portion, attached to the front surface of the display panel or formed integrally with the display panel; a touch driving circuit for sensing a touch of a human body or a touch pen using a plurality of touch electrodes arranged in the touch sensing portion; as well as A display driving circuit supplies data voltages and pixel driving control signals to the plurality of pixels to control an image display operation of each of the plurality of pixels. The display driving circuit supplies an active control voltage that changes in direct proportion or in inverse proportion to a temperature change of the display panel to at least one thin film transistor included in the plurality of pixels.

12. The display device according to claim 11, wherein The plurality of pixels include a light emitting element and a pixel circuit for controlling the amount of light emitted by the light emitting element. The pixel circuit includes a plurality of thin film transistors and at least one capacitor. At least one first thin film transistor among the plurality of thin film transistors comprises: a first gate electrode; A first active layer, covering the first gate electrode with a preset first planar area and being patterned; a first source electrode formed to cover the first gate electrode and a portion of the first active layer overlapping with the first gate electrode; and The first drain electrode is formed in a direction opposite to the first source electrode to cover the first gate electrode and a portion of the first active layer overlapping with the first gate electrode.

13. The display device according to claim 12, wherein: At least one second thin film transistor among the plurality of thin film transistors comprises: a second gate electrode; a second active layer covering the second gate electrode with a preset second planar area and being patterned; a second source electrode formed to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode; and The second drain electrode is formed in a direction opposite to the second source electrode to cover the second gate electrode and a portion of the second active layer overlapping with the second gate electrode.

14. The display device according to claim 13, wherein: The first active layer has a first plane area that is larger or wider than a second plane area of ​​the second active layer. The height or thickness of the first active layer is formed to be higher or thicker than the height or thickness of the second active layer, The width of the first active layer in at least one direction is formed to be wider than the width of the second active layer in at least one direction.

15. The display device according to claim 12, wherein: In at least one first thin film transistor among the plurality of thin film transistors, The first active layer is electrically connected to the drain electrode or the source electrode, or the gate electrode is electrically connected to the drain electrode or the source electrode, thereby forming a diode structure or a self-bias structure.

16. The display device according to claim 12, wherein: In at least one first thin film transistor among the plurality of thin film transistors, The first active layer is electrically connected to the display driving circuit via respective voltage control wirings, and receives the active control voltage from the display driving circuit in units of predetermined periods.

17. The display device according to claim 16, wherein: The display driving circuit changes the voltage of the active control voltage in direct proportion or inverse proportion to the change in the temperature of the display panel or the external temperature, and supplies the active control voltage with changed voltage to the first active layer of the first thin film transistor through the voltage control wiring.

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