Display device

Abstract

To provide a display device capable of improving display quality.SOLUTION: A display device comprises a liquid crystal layer including a polymer-dispersed liquid crystal. The display device comprises a display panel having a display area in which an image is displayed and a peripheral area surrounding the display area. The display panel has a transparent electrode which is placed in the peripheral area and is capable of heating the peripheral area.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a display device. [Background technology]

[0002] In recent years, display devices have been proposed that include a display panel with a polymer dispersed liquid crystal (PDLC) layer, a light source, etc. The polymer dispersed liquid crystal layer can be switched between a scattering state in which it scatters light and a transparent state in which it transmits light.

[0003] In the scattering state, the display device is able to display an image. When the display panel is switched to the transparent state, the user can see through the display panel to see the background. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-47455 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a display device that can improve display quality. [Means for solving the problem]

[0006] A display device according to one embodiment includes a liquid crystal layer containing polymer dispersed liquid crystals. The display device includes a display panel having a display area where an image is displayed and a peripheral area surrounding the display area. The display panel includes a transparent electrode disposed in the peripheral area and capable of heating the peripheral area. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a display device according to the first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of the display device according to the first embodiment. [Figure 3] FIG. 3 is a diagram showing an example of the configuration of a transparent electrode included in the display panel according to the first embodiment. [Figure 4] FIG. 4 is a schematic plan view of the display device according to the first embodiment. [Figure 5] FIG. 5 is a block diagram including a control circuit according to the first embodiment. [Figure 6] FIG. 6 is a circuit diagram of the display device according to the first embodiment. [Figure 7] FIG. 7 is a flowchart showing an example of heating control in the control circuit. [Figure 8] FIG. 8 is a diagram showing an example of a configuration applicable to the peripheral area. [Figure 9] FIG. 9 is a diagram showing an example of the configuration of the common electrode and the transparent electrode. [Figure 10] FIG. 10 is a schematic cross-sectional view of the display panel taken along line XX in FIG. [Figure 11] FIG. 11 is a schematic cross-sectional view of the display panel taken along line XI-XI in FIG. [Figure 12] FIG. 12 is a diagram showing an example of the configuration of the counter electrode and the transparent electrode of the display device according to the second embodiment. [Figure 13] FIG. 13 is a schematic cross-sectional view of a display panel according to the second embodiment. [Figure 14] FIG. 14 is a schematic cross-sectional view of a display panel according to the second embodiment. [Figure 15] FIG. 15 is a schematic cross-sectional view of a display panel of a display device according to the third embodiment. [Figure 16] FIG. 16 is a schematic cross-sectional view of a display panel of a display device according to the third embodiment. [Figure 17] FIG. 17 is a diagram showing an example of the configuration of a transparent electrode included in a display panel according to the fourth embodiment. [Figure 18] FIG. 18 is a diagram showing an example of the configuration of a transparent electrode included in a display panel according to the fifth embodiment. [Figure 19] FIG. 19 is a diagram showing an example of the configuration of a transparent electrode included in a display panel according to the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described with reference to the drawings. Note that the disclosure is merely an example, and any appropriate modifications that can be easily conceived by a person skilled in the art while maintaining the gist of the invention are naturally included within the scope of the present invention.

[0009] In addition, in order to clarify the description, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, in this specification and each drawing, components that perform the same or similar functions as those described above with reference to the previous drawings are given the same reference numerals, and duplicate detailed descriptions may be omitted as appropriate.

[0010] In the drawings, mutually perpendicular X, Y, and Z axes are shown as necessary to facilitate understanding. The direction along the X axis is referred to as the first direction X, the direction along the Y axis is referred to as the second direction Y, and the direction along the Z axis is referred to as the third direction Z. Viewing various elements parallel to the third direction Z is referred to as a planar view.

[0011] In the embodiments, a highly light-transmitting liquid crystal display device (so-called transparent display device) that uses a polymer dispersed liquid crystal is disclosed as an example of a display device, but the configurations disclosed in the embodiments can also be applied to other types of display devices.

[0012] [First embodiment] 1 is a diagram showing an example of the configuration of a display device DSP according to this embodiment. In FIG. 1, the display device DSP is viewed in the direction opposite to the third direction Z.

[0013] The display device DSP includes a display panel PNL, a light source unit LU, and a light guide LG. In Fig. 1, the light source unit LU and the light guide LG are shown with broken lines, and some of these are omitted.

[0014] The display panel PNL has an array substrate AR and a counter substrate CT stacked in the third direction Z. The counter substrate CT faces the array substrate AR. In FIG. 1, the shapes of the array substrate AR and the counter substrate CT are both rectangular and elongated in the first direction X. However, the shapes of the array substrate AR and the counter substrate CT are not limited to this example.

[0015] The width of the array substrate AR in the second direction Y is greater than the width of the counter substrate CT in the second direction Y. As a result, the array substrate AR has a mounting area MA provided in a portion that does not overlap with the counter substrate CT. A wiring board, which will be described later, and the like are mounted in the mounting area MA.

[0016] The display panel PNL has a display area DA for displaying an image and a frame-shaped peripheral area SA surrounding the display area DA. Both the display area DA and the peripheral area SA are formed in the area where the array substrate AR and the counter substrate CT overlap.

[0017] As shown enlarged at the top of FIG. 1, a plurality of scanning lines G and a plurality of signal lines S are arranged in the display area DA. The plurality of scanning lines G extend in a first direction X and are aligned in a second direction Y. The plurality of signal lines S extend in the second direction Y and are aligned in the first direction X. The plurality of signal lines S intersect with the plurality of scanning lines G.

[0018] The display panel PNL further includes a liquid crystal layer LC sealed between the array substrate AR and the counter substrate CT. The liquid crystal layer LC is disposed in the display area DA and the peripheral area SA. As shown enlarged and schematically in the lower part of FIG. 1, the liquid crystal layer LC is made of a polymer-dispersed liquid crystal containing a polymer 31 and liquid crystal molecules 32.

[0019] In one example, the polymer 31 is a liquid crystal polymer. The polymer 31 is formed in stripes extending along the first direction X and aligned in the second direction Y. The liquid crystal molecules 32 are dispersed in the gaps between the polymer 31 and are oriented with their major axes aligned along the first direction X.

[0020] Each of the polymer 31 and the liquid crystal molecules 32 has optical anisotropy or refractive index anisotropy. The response of the polymer 31 to an electric field is lower than the response of the liquid crystal molecules 32 to an electric field.

[0021] In one example, the alignment direction of the polymer 31 hardly changes regardless of the presence or absence of an electric field, whereas the alignment direction of the liquid crystal molecules 32 changes depending on the voltage applied to the liquid crystal layer LC.

[0022] When no voltage is applied to the liquid crystal layer LC, the optical axes of the polymer 31 and the liquid crystal molecules 32 are parallel to each other, and light incident on the liquid crystal layer LC is transmitted through the liquid crystal layer LC with almost no scattering within the liquid crystal layer LC (transparent state).

[0023] When a voltage is applied to the liquid crystal layer LC, the optical axes of the polymer 31 and the liquid crystal molecules 32 intersect with each other, and light incident on the liquid crystal layer LC is scattered within the liquid crystal layer LC (scattering state).

[0024] The display area DA includes a plurality of pixels PX arranged in a matrix in the first direction X and the second direction Y. Each pixel PX includes a switching element SW, a pixel electrode PE, a counter electrode CE, and a capacitance CS.

[0025] The switching element SW is configured by, for example, a thin film transistor (TFT), and is electrically connected to the scanning line G and the signal line S. The pixel electrode PE is electrically connected to the switching element SW.

[0026] The liquid crystal layer LC (particularly, the liquid crystal molecules 32) is driven by an electric field generated between the pixel electrode PE and the counter electrode CE. The counter electrode CE is provided in common to the plurality of pixel electrodes PE. The capacitance CS is formed, for example, between an electrode having the same potential as the counter electrode CE and an electrode having the same potential as the pixel electrode PE.

[0027] The light source unit LU and the light guide LG are arranged along the mounting area MA. The light source unit LU includes a plurality of light sources LS arranged in a first direction X. Each light source LS emits light through the light guide LG toward the display panel PNL along a second direction Y. The light guide LG may be, for example, a lens such as a prism lens.

[0028] For example, the plurality of light sources LS include a light emitting element that emits red light, a light emitting element that emits green light, and a light emitting element that emits blue light. These light emitting elements may be aligned in the first direction X or stacked in the third direction Z. The light emitting elements are, for example, LEDs (Light Emitting Diodes).

[0029] 2 is a schematic cross-sectional view of the display device DSP according to this embodiment, which shows the structure of the display panel PNL and the like, and omits elements such as the scanning lines G, signal lines S, and switching elements SW.

[0030] The array substrate AR and the counter substrate CT are bonded together by a seal material SE. The seal material SE has a shape that surrounds the display area DA. The liquid crystal layer LC is sealed in the space surrounded by the seal material SE.

[0031] The array substrate AR has the above-mentioned pixel electrodes PE. The counter substrate CT has the above-mentioned counter electrode CE. The pixel electrodes PE face the counter electrode CE with the liquid crystal layer LC sandwiched therebetween.

[0032] The counter electrode CE faces the plurality of pixel electrodes PE. The counter electrode CE is arranged in the display area DA and the peripheral area SA (shown in FIG. 1). A liquid crystal layer LC is located between the plurality of pixel electrodes PE and the counter electrode CE.

[0033] The pixel electrodes PE and counter electrodes CE are formed on transparent insulating substrates provided on the array substrate AR and counter substrate CT, respectively. These insulating substrates are made of, for example, glass, but may also be made of plastic. The pixel electrodes PE and counter electrodes CE are made of, for example, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0034] In one example, the pixel electrodes PE and the counter-electrode CE are covered with alignment films (to be described later) formed on the array substrate AR and the counter-substrate CT, respectively. Note that the arrangement of the pixel electrodes PE and the counter-electrode CE is not limited to this example.

[0035] The display panel PNL may further include a cover member CM1 and a cover member CM2. These cover members CM1 and CM2 are both transparent and, for example, cover glasses made of glass. As another example, the cover members CM1 and CM2 may be made of plastic.

[0036] The array substrate AR has a main surface F1, a main surface F2 opposite to the main surface F1, and side surfaces E1a and E1b connecting the main surfaces F1 and F2. The cover member CM1 has a main surface F3 facing the main surface F1, a main surface F4 opposite to the main surface F3, and side surfaces E2a and E2b connecting the main surfaces F3 and F4. The main surfaces F1 and F3 are adhered by a transparent first adhesive layer AD1. The first adhesive layer AD1 is, for example, OCA (Optical Clear Adhesive).

[0037] The counter substrate CT has a main surface F5 facing the main surface F2 via the liquid crystal layer LC, a main surface F6 opposite the main surface F5, and side surfaces E3a and E3b connecting the main surfaces F5 and F6. The cover member CM2 has a main surface F7 facing the main surface F6, a main surface F8 opposite the main surface F7, and side surfaces E4a and E4b connecting the main surfaces F7 and F8. The main surfaces F6 and F7 are bonded together by a transparent second adhesive layer AD2. The second adhesive layer AD2 is OCA, just like the first adhesive layer AD1.

[0038] The side surfaces E1a, E2a, E3a, and E4a are all located on the light source LS side (light incident side). The side surfaces E1b, E2b, E3b, and E4b are all located on the opposite side of the light source LS (opposite the light incident side). The mounting area MA is formed in a portion of the array substrate AR that protrudes beyond the side surface E3a in the direction opposite to the second direction Y.

[0039] 2, the side surfaces E2a, E4a, E2b, and E4b are planes parallel to the first direction X and the third direction Z. However, the cross-sectional shapes of the side surfaces E2a, E4a, E2b, and E4b are not limited to this example.

[0040] 2, reflective materials RF are disposed near the side surfaces E1b, E2b, E3b, and E4b. The reflective materials RF are, for example, reflective tapes attached to the side surfaces E1b, E2b, E3b, and E4b. As another example, the reflective materials RF may be reflective films formed on the side surfaces E1b, E2b, E3b, and E4b.

[0041] In the example shown in Fig. 2, the light source LS faces the side surface E4a. The light source LS may also face the side surface E3a. The light guide LG is disposed between the side surface E4a and the light source LS. Fig. 2 shows an example of the path of light L emitted by the light source LS. The light L emitted from the light source LS passes through the light guide LG and enters the side surface E4a.

[0042] This light L heads toward the anti-light incident side while repeatedly being totally reflected between the principal surface F8 and the principal surface F4. The light L that reaches the side surfaces E1b, E2b, E3b, and E4b is reflected by the reflector RF and heads toward the light incident side while repeatedly being totally reflected between the principal surface F8 and the principal surface F4.

[0043] Near the pixels PX in the transparent state, the light L is hardly scattered by the liquid crystal layer LC. Therefore, the light L hardly leaks outside the cover members CM1 and CM2. On the other hand, near the pixels PX in the scattering state, the light L is scattered by the liquid crystal layer LC. This scattered light SL is emitted from the cover members CM1 and CM2 and is visually recognized by the user as a displayed image. It is also possible to realize gradational expression of the degree of scattering (brightness) by gradually defining the voltage applied to the pixel electrodes PE within a predetermined range.

[0044] In the vicinity of the transparent pixels PX, external light incident on the cover members CM1 and CM2 passes through the liquid crystal layer LC without being scattered much. That is, when the display panel PNL is viewed from the cover member CM1 side, the background on the cover member CM2 side is visible, and when the display panel PNL is viewed from the cover member CM2 side, the background on the cover member CM1 side is visible.

[0045] For example, the display device DSP may use a field sequential method for displaying images by repeating a first subframe in which red light-emitting elements among the multiple light sources LS are turned on to display a red image, a second subframe in which green light-emitting elements are turned on to display a green image, and a third subframe in which blue light-emitting elements are turned on to display a blue image.

[0046] Fig. 3 is a diagram showing an example of the configuration of the transparent electrode TE1 provided in the display panel PNL in this embodiment. In Fig. 3, the display panel PNL is viewed in the direction opposite to the third direction Z. In Fig. 3, some of the elements constituting the display panel PNL, such as the cover members CM1 and CM2, are omitted.

[0047] 3, the display panel PNL has a first side surface SS1, a second side surface SS2, a third side surface SS3, and a fourth side surface SS4. The first side surface SS1 and the second side surface SS2 extend in a first direction X and are arranged at an interval in a second direction Y. The first side surface SS1 faces in the direction opposite to the second direction Y, and the second side surface SS2 faces in the second direction Y. In other words, the second side surface SS2 faces in the direction opposite to the first side surface SS1.

[0048] The first side surface SS1 is a surface located between the plurality of light sources LS (shown in FIG. 1) and the display area DA. The first side surface SS1 includes side surfaces E3a and E4a (shown in FIG. 2). The second side surface SS2 includes side surfaces E1b, E2b, E3b, and E4b (shown in FIG. 2).

[0049] The third side surface SS3 and the fourth side surface SS4 extend in the second direction Y and are arranged at an interval in the first direction X. The third side surface SS3 and the fourth side surface SS4 connect the first side surface SS1 and the second side surface SS2. The third side surface SS3 faces in the direction opposite to the first direction X, and the fourth side surface SS4 faces in the first direction X.

[0050] The display panel PNL further includes a transparent electrode TE1 arranged in the peripheral area SA. The transparent electrode TE1 is configured to be able to heat the peripheral area SA. In other words, the transparent electrode TE1 functions as a heater that heats the peripheral area SA. The transparent electrode TE1 is formed of, for example, a transparent conductive material.

[0051] The transparent electrode TE1 is not disposed in the display area DA, but is disposed only in the peripheral area SA, surrounding the display area DA. In this embodiment, the transparent electrode TE1 is disposed on the array substrate AR. In the example shown in FIG. 3, the transparent electrode TE1 includes electrodes TE11, TE12, TE13, and TE14.

[0052] The electrode TE11 is mainly arranged between the display area DA and the first side surface SS1, the electrode TE12 is mainly arranged between the display area DA and the second side surface SS2, the electrode TE13 is mainly arranged between the display area DA and the third side surface SS3, and the electrode TE14 is mainly arranged between the display area DA and the fourth side surface SS4.

[0053] The electrodes TE11, TE12, TE13, and TE14 are patterned into a predetermined shape, for example, a zigzag shape.

[0054] In the illustrated example, the straight-line segments are connected at right angles to form a zigzag shape. As another example, the straight-line segments may be connected by curved connectors. As yet another example, the zigzag shape may be formed by connecting the straight-line segments at angles other than right angles.

[0055] The electrodes TE11, TE12, TE13, and TE14 may have various shapes and are not limited to the above-mentioned examples. The electrodes TE11, TE12, TE13, and TE14 may have, for example, a meandering shape.

[0056] By forming the transparent electrode TE1 in the above-described shape, the overall length of the transparent electrode TE1 can be increased. This increases the electrical resistance of the electrodes TE11, TE12, TE13, and TE14. As a result, the amount of heat generated when a voltage is applied to the electrodes TE11, TE12, TE13, and TE14 can be increased.

[0057] The electrodes TE11, TE12, TE13, and TE14 extend, for example, to the mounting area MA. The electrode TE11 has ends 11a and 11b. The electrode TE12 has ends 12a and 12b. The electrode TE13 has ends 13a and 13b. The electrode TE14 has ends 14a and 14b.

[0058] Terminals (not shown) are arranged at the ends 11a and 11b, the ends 12a and 12b, the ends 13a and 13b, and the ends 14a and 14b in the mounting area MA. The electrodes TE11, TE12, TE13, and TE14 are electrically connected to a first power supply circuit and a second voltage circuit, which will be described later.

[0059] 4 is a schematic plan view of the display device DSP according to this embodiment. The display device DSP further includes a plurality of wiring boards 1 and a control board 2. The plurality of wiring boards 1 are connected to a mounting area MA. The plurality of wiring boards 1 are, for example, flexible printed circuit boards.

[0060] For example, an IC chip 3 is disposed on each of the plurality of wiring boards 1. The IC chip 3 includes, for example, a drive circuit for displaying an image. The IC chip 3 may be disposed on the display panel PNL or on the control board 2. The number of wiring boards 1 may be one, or may be three or more. The plurality of wiring boards 1 are connected to the control board 2 via terminals 2a.

[0061] The control board 2 is electrically connected to the display panel PNL via a plurality of wiring boards 1. The control board 2 is, for example, a printed circuit board having greater rigidity than the wiring boards 1.

[0062] The display device DSP further includes a first power supply circuit 11, a second power supply circuit 13, a temperature sensor 15, and a control circuit 17. The first power supply circuit 11, the second power supply circuit 13, the temperature sensor 15, and the control circuit 17 are arranged on the control board 2, for example, but are not limited to this example.

[0063] The first power supply circuit 11 and the second power supply circuit 13 are circuits for applying a voltage to the transparent electrode TE1. Specifically, the first power supply circuit 11 is a circuit for applying a common voltage (Vcom) to the transparent electrode TE1, and the second power supply circuit 13 is a circuit for causing the transparent electrode TE1 to function as a heater. The voltage applied by the second power supply circuit 13 is changed as appropriate depending on the material forming the transparent electrode TE1, etc.

[0064] The temperature sensor 15 detects the ambient temperature. Here, the ambient temperature is the temperature around the display panel PNL. In other words, the ambient temperature is the temperature around the liquid crystal layer LC. The ambient temperature is also the temperature of the location where the display device DSP is installed.

[0065] The temperature sensor 15 detects the ambient temperature, for example, while the display device DSP is operating. The temperature sensor 15 is disposed on the control board 2 as described above, but may also be disposed on the display panel PNL, for example. The temperature sensor 15 is an element for detecting the ambient temperature, for example.

[0066] The control circuit 17 is a circuit that controls the driving of the display device DSP. Specifically, the control circuit 17 has a function of controlling the image display in the display area DA, and a function of controlling the voltage applied to the transparent electrode TE1 based on the temperature detected by the temperature sensor 15.

[0067] 5 is a block diagram including a control circuit 17 in this embodiment. The display device DSP further includes a storage unit 19. The storage unit 19 stores various information such as a program for controlling the display device DSP and data including a specified temperature, which will be described later.

[0068] The control circuit 17 executes various processes by, for example, reading out a program from the storage unit 19. The storage unit 19 may be configured as a part of the control circuit 17, or may be configured as an element separate from the control circuit 17. The storage unit 19 is, for example, a memory, a ROM, or the like, but is not limited to these examples.

[0069] The display device DSP further includes a switching circuit 41. The switching circuit 41 functions as a switch that switches the connection path of the transparent electrode TE1. The switching circuit 41 is configured by combining a plurality of thin film transistors, for example.

[0070] The control circuit 17 is electrically connected to the memory unit 19, the temperature sensor 15, and the switching circuit 41. This allows the control circuit 17 to read necessary information from the memory unit 19, obtain temperature information detected by the temperature sensor 15, and control the switching circuit 41.

[0071] 6 is a circuit diagram of the display device DSP according to this embodiment. The second power supply circuit 13 includes power supply units 131 and 133. The power supply unit 131 applies a voltage with a different potential from that of the power supply unit 133. The switching circuit 41 has switches 411, 413, 415, and 417.

[0072] One end of the switch 411 is connected to the ends 13a and 13b of the electrode TE13, respectively, and the other end of the switch 411 is connected to the first power supply circuit 11 and the power supply units 131 and 133, respectively.

[0073] One end of the switch 413 is connected to the ends 12a and 12b of the electrode TE12, and the other end of the switch 413 is connected to the first power supply circuit 11 and the power supply units 131 and 133, respectively.

[0074] One end of the switch 415 is connected to the ends 11a and 11b of the electrode TE11, and the other end of the switch 415 is connected to the first power supply circuit 11 and the power supply units 131 and 133, respectively.

[0075] One end of the switch 417 is connected to the ends 14a and 14b of the electrode TE14, respectively, and the other end of the switch 417 is connected to the first power supply circuit 11 and the power supply units 131 and 133, respectively.

[0076] A common voltage is applied to the transparent electrode TE1 when the switches 411, 413, 415, and 417 are connected to the first power supply circuit 11. In contrast, when the switches 411, 413, 415, and 417 are connected to the second power supply circuit 13, a current flows through each of the transparent electrodes TE1.

[0077] Next, the heating control in the control circuit 17 will be described.

[0078] 7 is a flowchart showing an example of heating control in the control circuit 17. In the display device DSP, the heating control in the control circuit 17 causes the transparent electrode TE1 to function as a heater that heats the peripheral area SA.

[0079] First, the control circuit 17 acquires ambient temperature information detected by the temperature sensor 15 (step S101). The timing at which the control circuit 17 acquires the ambient temperature information from the temperature sensor 15 may be before or during image display in the display device DSP. Alternatively, the timing may be set so that the user can acquire the ambient temperature information at any timing.

[0080] Next, the control circuit 17 determines whether the ambient temperature acquired from the temperature sensor 15 is equal to or lower than a specified temperature (step S102). The specified temperature is set so that the transparent electrode TE1 can heat the liquid crystal layer LC when the display device DSP is installed in a low-temperature environment such as a cold region. The specified temperature is stored in advance in the storage unit 19 (shown in FIG. 5), for example.

[0081] If the ambient temperature is equal to or lower than the specified temperature (YES in step S102), the control circuit 17 executes heating control (step S103). Specifically, the control circuit 17 controls the switching circuit 41 to connect the second power supply circuit 13 to the switches 411, 413, 415, and 417.

[0082] The transparent electrode TE1 is made of a transparent conductive material and therefore has a higher electrical resistance than metal materials. When a current flows through the transparent electrode TE1, the transparent electrode TE1 generates heat. The heat generated by the transparent electrode TE1 heats the peripheral area SA. This heats the display panel PNL including the liquid crystal layer LC in the display area DA.

[0083] The heating control by the control circuit 17 may be set to end after a predetermined time has elapsed, or may be set to be repeatedly executed until the ambient temperature exceeds a specified temperature.

[0084] If the ambient temperature is higher than the specified temperature (NO in step S102), the control circuit 17 does not execute the heating control. Specifically, the control circuit 17 controls the switching circuit 41 to connect the first power supply circuit 11 to the switches 411, 413, 415, and 417.

[0085] In other words, when the ambient temperature is higher than a predetermined temperature, the control circuit 17 controls the common voltage to be applied to the transparent electrode TE1. In this way, the control circuit 17 can control the voltage applied to the transparent electrode TE1 based on the temperature detected by the temperature sensor 15.

[0086] Next, a structure applicable to the peripheral area SA will be described. As an example, the area between the display area DA and the third side surface SS3, in which the transparent electrode TE1 is formed, will be described. The structure described below can also be applied to other areas.

[0087] Fig. 8 is a diagram showing an example of a configuration applicable to the peripheral area SA. Fig. 9 is a diagram showing an example of a configuration of the common electrode 70 and the transparent electrode TE1. In Figs. 8 and 9, the display panel PNL is viewed in the direction opposite to the third direction Z.

[0088] The array substrate AR further includes a first wiring section 20 arranged in the peripheral area SA. The first wiring section 20 is electrically connected to a plurality of scanning lines G arranged in the display area DA. A voltage is applied to the plurality of scanning lines G from a drive circuit (not shown) via the first wiring section 20. As shown in FIG. 8, the first wiring section 20 includes a plurality of wires 200 connected to the plurality of scanning lines G, respectively.

[0089] The multiple scanning lines G are arranged at intervals in the second direction Y. Each of the multiple wirings 200 includes a portion extending in the first direction X and a portion extending in the second direction Y. The width of the first wiring portion 20 decreases along the second direction Y. In other words, the first wiring portion 20 is formed in a staircase shape by the multiple wirings 200, for example.

[0090] The array substrate AR further includes a second wiring section 30. A voltage having the same potential as that of the counter electrode CE is applied to the second wiring section 30. The second wiring section 30 functions as a wiring that applies a common voltage to the counter electrode CE of the counter substrate CT, for example.

[0091] The second wiring unit 30 is arranged in an area of ​​the peripheral area SA where the first wiring unit 20 is not arranged. Specifically, the second wiring unit 30 is arranged between the third side surface SS3 and the first wiring unit 20. Although not shown, the second wiring unit 30 is arranged between the fourth side surface SS4 and the first wiring unit 20. In other words, the display area DA is located between the second wiring units 30.

[0092] The second wiring portion 30 is formed to face the first wiring portion 20. Specifically, the width of the second wiring portion 30 increases along the second direction Y. As shown in FIG. 8, the second wiring portion 30 has a plurality of wires 300. The first wiring portion 20 and the second wiring portion 30 are formed from the same material as the scanning lines G, the signal lines S, etc.

[0093] By forming the second wiring section 30, the appearance of the peripheral area SA can be improved when the display panel PNL is viewed from the array substrate AR side. Moreover, the first wiring section 20 and the second wiring section 30 are formed at a pitch equivalent to that of the pixels PX, for example. This can further improve the appearance of the peripheral area SA. From another perspective, the boundary between the display area DA and the peripheral area SA is less noticeable to the user.

[0094] 9, the array substrate AR further includes a common electrode 70. The common electrode 70 is disposed in the display area DA and the peripheral area SA. A voltage having the same potential as that of the counter electrode CE is applied to the common electrode 70. The common electrode 70 is connected to, for example, a first power supply circuit 11.

[0095] As a result, the common electrode 70 has a function of shielding the liquid crystal layer LC so that it does not respond to voltages applied to the scanning lines G and the signal lines S. The common electrode 70 is formed of, for example, the same material as the transparent electrode TE1.

[0096] The common electrode 70 has a first portion 71 arranged in the display area DA and a second portion 72 arranged in the peripheral area SA. The second portion 72 is electrically connected to the first portion 71. The first portion 71 is formed in a lattice pattern so as to overlap with a plurality of scanning lines G and signal lines S (shown in FIG. 8). The first portion 71 faces the pixel electrode PE in the display area DA and forms a capacitance CS (shown in FIG. 1). The second portion 72 is formed over almost the entire surface of the peripheral area SA.

[0097] 9, the second portion 72 has a slit 700 (first slit). The electrode TE13 is disposed along the slit 700. The electrode TE13 is insulated from the common electrode 70. The electrode TE13 is connected to power supply units 131 and 133, for example.

[0098] The slit 700 has a plurality of first slit portions 710 extending along the first direction X and a plurality of second slit portions 720 extending along the second direction Y and connected to the plurality of first slit portions 710. The slit 700 is formed in a zigzag shape by the plurality of first slit portions 710 and the plurality of second slit portions 720. The shape of the slit 700 is changed as appropriate depending on the shape of the transparent electrode TE1.

[0099] The electrode TE13 includes a portion formed along the first wiring portion 20 and the second wiring portion 30 in the first direction X. The electrode TE13 includes a portion formed along the first wiring portion 20 and the second wiring portion 30 in the second direction Y.

[0100] As shown in Fig. 8, the display panel PNL further includes a light-shielding layer BM. In Fig. 8, the light-shielding layer BM is indicated by dots. The light-shielding layer BM is disposed on the counter substrate CT. The light-shielding layer BM is formed in a lattice pattern in the display area DA and the peripheral area SA.

[0101] 8, the light-shielding layer BM overlaps the plurality of scanning lines G and the plurality of signal lines S in the display area DA. In addition, the light-shielding layer BM overlaps the first wiring portion 20, the second wiring portion 30, and the electrode TE13 (transparent electrode TE1) in the peripheral area SA. Focusing on the second portion 72, the light-shielding layer BM overlaps the first slit portion 710 and the second slit portion 720, respectively.

[0102] The light-shielding layer BM is formed of, for example, a metal material, but may also be formed of a black resin or the like. The light-shielding layer BM prevents light reflected by the first wiring unit 20 and the second wiring unit 30 on the array substrate side from emitting from the display panel PNL. In addition, the light-shielding layer BM overlaps the electrode TE13, thereby improving the appearance in the peripheral area SA.

[0103] The area of ​​the opening AP1 of the light-shielding layer BM in the display area DA is equal to the area of ​​the opening AP2 of the light-shielding layer BM in the peripheral area SA. Here, "equal" includes a margin of error that does not affect the appearance of the display area DA and the peripheral area SA on the display device DSP. This makes it difficult for the user to recognize the boundary between the display area DA and the peripheral area SA.

[0104] Fig. 10 is a schematic cross-sectional view of the display panel PNL taken along line XX in Fig. 8. Fig. 11 is a schematic cross-sectional view of the display panel PNL taken along line XI-XI in Fig. 8. In Fig. 10, the display panel PNL is viewed in the second direction Y, and in Fig. 11, the display panel PNL is viewed in the first direction X. Some of the components of the display panel PNL are omitted in Figs. 10 and 11.

[0105] The above-mentioned first wiring section 20 and second wiring section 30 are disposed on a transparent insulating substrate 10A of the array substrate AR. The first wiring section 20 and second wiring section 30 are each covered with an insulating film 61. The insulating film 61 is a transparent organic insulating film made of, for example, acrylic resin. The insulating film 61 has the function of flattening unevenness caused by the first wiring section 20, the second wiring section 30, etc.

[0106] The common electrode 70 faces the counter electrode CE with the liquid crystal layer LC sandwiched therebetween. A second portion 72 of the common electrode 70 covers the upper surface and side surfaces of the insulating film 61. The second portion 72 has a first slit portion 710 and a second slit portion 720. The insulating film 61 is exposed from the slit 700.

[0107] As described with reference to FIG. 9, the electrode TE13 is disposed in the slit 700 (the first slit portion 710 and the second slit portion 720). The electrode TE13 is formed, for example, in the same layer as the common electrode 70. The electrode TE13 overlaps the first wiring portion 20 and the second wiring portion 30 with the insulating film 61 sandwiched therebetween. The electrode TE13 covers, for example, the upper surface and side surfaces of the insulating film 61.

[0108] 10, the array substrate AR may further include auxiliary wiring 52. The auxiliary wiring 52 is in contact with the second portion 72 above the first wiring section 20. The auxiliary wiring 52 is not disposed above the electrode TE13. In other words, the auxiliary wiring 52 is not in contact with the electrode TE13.

[0109] A common voltage is applied to the auxiliary wiring 52. By arranging the auxiliary wiring 52 in this manner, it is possible to reduce the resistance of the common electrode 70. Although not shown, the auxiliary wiring 52 may be further arranged so as to be in contact with the first portion 71.

[0110] In the counter substrate CT, the above-mentioned light-shielding layer BM is disposed on a transparent insulating substrate 10C. The counter electrode CE covers the light-shielding layer BM and the insulating substrate 10C. In other words, the light-shielding layer BM is disposed between the insulating substrate 10C and the counter electrode CE. The light-shielding layer BM is in contact with the counter electrode CE.

[0111] The light-shielding layer BM overlaps the insulating film 61. Focusing on the electrode TE13, the light-shielding layer BM overlaps the entire electrode TE13. From another perspective, the light-shielding layer BM overlaps the first slit portion 710 and the second slit portion 720. In the examples shown in FIGS. 10 and 11 , the width of the light-shielding layer BM is larger than the width of the electrode TE13.

[0112] The display panel PNL further includes alignment films AL1 and AL2. The alignment film AL1 is disposed on the array substrate AR, and the alignment film AL2 is disposed on the counter substrate CT. The liquid crystal layer LC is disposed between the alignment films AL1 and AL2.

[0113] The alignment film AL1 covers the auxiliary wiring 52, the common electrode 70, and the electrode TE13. The auxiliary wiring 52 is located between the alignment film AL1 and the upper surface of the common electrode 70. In contrast, the upper surface of the electrode TE13 is in contact with the alignment film AL1. The alignment film AL2 covers the counter electrode CE.

[0114] The display device DSP configured as described above can improve the display quality. For example, when the ambient temperature is low (in a low-temperature environment), the response speed of the liquid crystal molecules 32 (shown in FIG. 1) may decrease. Such a reaction of the liquid crystal layer LC can cause a decrease in the display quality.

[0115] In this embodiment, the transparent electrode TE1 is configured to be heat-generating. Heating the transparent electrode TE1 in the peripheral area SA heats the liquid crystal layer LC, making the temperature of the liquid crystal layer LC higher than the ambient temperature, and reducing the response speed of the liquid crystal molecules 32.

[0116] As a result, the display quality of the display device DSP can be improved. From another perspective, the display device DSP of this embodiment is less susceptible to restrictions imposed by usage conditions such as the ambient temperature.

[0117] The transparent electrode TE1 is controlled independently of, for example, image display control in the display area DA. This allows the transparent electrode TE1 to heat the peripheral area SA at a timing different from the drive timing of the image display. For example, by heating the transparent electrode TE1 before an image is displayed, the image can be displayed promptly at the start of display.

[0118] Furthermore, in this embodiment, there is no need to separately provide heaters for heating the display panel PNL, which can prevent problems such as the display device DSP becoming larger and heavier due to the provision of heaters.

[0119] In this embodiment, the transparent electrode TE1 is made of the same material as the common electrode 70. This allows the transparent electrode TE1 to be formed in the same process as the process of forming the common electrode 70. As a result, manufacturing costs can be reduced.

[0120] In this embodiment, the counter substrate CT has a light-shielding layer overlapping the transparent electrode TE1. When a potential difference occurs between the transparent electrode TE1 and the counter electrode CE, the liquid crystal molecules 32 respond to the potential difference. This response of the liquid crystal layer LC can cause a deterioration in the appearance of the peripheral area SA. In this embodiment, the light-shielding layer BM is arranged so as to overlap the transparent electrode TE1. This makes it less likely that the response of the liquid crystal molecules 32 due to the potential difference will affect the appearance of the peripheral area SA.

[0121] In this embodiment, the control circuit 17 executes heating control based on the ambient temperature detected by the temperature sensor 15. For example, when the ambient temperature is room temperature, the heating control is not executed, so that the power consumption of the display device DSP can be reduced.

[0122] As described above, the configuration of this embodiment can improve the display quality, and also provides various other advantageous effects.

[0123] It should be noted that the heating control in the control circuit 17 is not limited to the above example. The transparent electrode TE1 includes, for example, electrodes TE11, TE12, TE13, and TE14. Therefore, the control circuit 17 may control the electrodes TE11, TE12, TE13, and TE14 independently.

[0124] This allows the amount of heat generated in each region to be controlled in accordance with, for example, the distribution of ambient temperature. Furthermore, the transparent electrode TE1 may be configured to be controllable in accordance with partial driving, such as displaying an image in only a specific area of ​​the display region DA. While the transparent electrode TE1 includes electrodes TE11, TE12, TE13, and TE14, it may be configured with more or fewer electrodes. The configuration of the switching circuit 41 can be changed as appropriate depending on the number of electrodes that make up the transparent electrode TE1.

[0125] Furthermore, the control circuit 17 may perform control so as to change the amount of heat generated in the counter electrode CE according to, for example, the elapsed time. Specifically, the control circuit 17 may control the voltage applied to the transparent electrode TE1 so that the amount of heat generated is large at the start of the heating control and decreases over time.

[0126] By increasing the amount of heat generated at the start of heating control, the temperature of the liquid crystal layer LC can be raised quickly, and stable image display by the display device DSP can be achieved quickly. Also, the control circuit 17 may control the transparent electrode TE1 to constantly generate heat while an image is being displayed.

[0127] The display device DSP may further include a sensor for detecting the temperature of the liquid crystal layer LC, whereby the control circuit 17 may control the voltage applied to the transparent electrode TE1 based on the sensor so as to keep the temperature of the liquid crystal layer LC constant.

[0128] Next, other embodiments will be described. In the configurations of the following embodiments, the same configurations as those of the first embodiment can be applied to parts that are not specifically mentioned.

[0129] [Second embodiment] FIG. 12 is a diagram showing an example of the configuration of the counter electrode CE and transparent electrode TE2 of the display device DSP according to this embodiment. FIG. 12 explains the area between the display area DA and the third side surface SS3 in the peripheral area SA. The structure described below can also be applied to other areas. This embodiment differs from the first implementation form in that a heat-generating transparent electrode is arranged on the counter substrate CT.

[0130] The display panel PNL has a transparent electrode TE2 arranged on the counter substrate CT. In this embodiment, the transparent electrode TE2 functions as a heater that heats the peripheral area SA. The transparent electrode TE2 is also arranged between the display area DA and the first side surface SS1, between the display area DA and the second side surface SS2, and between the display area DA and the fourth side surface SS4.

[0131] The transparent electrode TE2 can have the same shape as the transparent electrode TE1 shown in FIG. 3. Specifically, the transparent electrode TE2 has, for example, a zigzag shape. In the example shown, the transparent electrode TE2 is an electrode TE23 that is disposed between the third side surface SS3 and the display area DA. The transparent electrode TE2 is formed of, for example, a transparent conductive material that is used to form the counter electrode CE.

[0132] A voltage is applied to the transparent electrode TE2 via a connection member (not shown) that is different from the connection member connected to the counter electrode CE. The connection member may be called a transfer or the like.

[0133] The counter electrode CE has a slit 800 (second slit) in the peripheral area SA. The transparent electrode TE2 is disposed along the slit 800. The transparent electrode TE2 is insulated from the counter electrode CE.

[0134] The slit 800 has a plurality of first slit portions 810 extending along the first direction X, and a plurality of second slit portions 820 extending along the second direction Y and connected to the plurality of first slit portions 810. The slit 800 is formed in a zigzag shape by the plurality of first slit portions 810 and the plurality of second slit portions 820. The shape of the slit 800 is changed as appropriate depending on the shape of the transparent electrode TE2.

[0135] 13 and 14 are schematic cross-sectional views of the display panel PNL in this embodiment. Figures 13 and 14 illustrate the area between the display area DA and the third side surface SS3 in the peripheral area SA.

[0136] 13, the display panel PNL is viewed in the second direction Y, and in Fig. 14, the display panel PNL is viewed in the first direction X. Some of the components of the display panel PNL are omitted in Fig. 13 and Fig. 14.

[0137] The electrode TE23 is disposed in the slit 800 (the first slit portion 810 and the second slit portion 820) as described with reference to Fig. 12. The electrode TE23 is formed in the same layer as the counter electrode CE.

[0138] A portion of the light-shielding layer BM is exposed from the first slit portion 810 and the second slit portion 820. The electrode TE23 overlaps the light-shielding layer BM. Specifically, the electrode TE23 is in contact with the light-shielding layer BM. The electrode TE23 is disposed between the light-shielding layer BM and the alignment film AL2. The electrode TE23 overlaps the first wiring portion 20 and the second wiring portion 30 with the liquid crystal layer LC sandwiched therebetween.

[0139] The configuration of this embodiment can also achieve the same effects as the first embodiment.

[0140] [Third embodiment] Figures 15 and 16 are schematic cross-sectional views of the display panel PNL of the display device DSP according to this embodiment. Figures 15 and 16 show a cross-section of the peripheral area SA of the display panel PNL. In Figure 15, the display panel PNL is viewed in the second direction Y, and in Figure 16, the display panel PNL is viewed in the first direction X. Some of the components of the display panel PNL are omitted in Figures 15 and 16.

[0141] This embodiment differs from the first implementation in that a heat-generating transparent electrode TE2 is further disposed on the counter substrate CT. In this embodiment, the transparent electrodes TE1 and TE2 each function as a heater that heats the peripheral area SA.

[0142] The display panel PNL has a transparent electrode TE1 arranged on the array substrate AR and a transparent electrode TE2 arranged on the counter-substrate CT. In this embodiment, the slit 700 formed in the second portion 72 corresponds to the first slit, and the slit 800 formed in the counter-electrode CE corresponds to the second slit.

[0143] For example, the transparent electrode TE1 has the same shape as the transparent electrode TE2. For example, the shape of the transparent electrode TE1 matches the shape of the transparent electrode TE2 when viewed in the direction opposite to the third direction Z. Note that the shape of the transparent electrode TE1 may be different from the shape of the transparent electrode TE2.

[0144] The light-shielding layer BM overlaps the transparent electrodes TE1 and TE2, respectively. Focusing on the slits 700 and 800, the light-shielding layer BM overlaps the slits 700 and 800, respectively.

[0145] The configuration of this embodiment can also achieve the same effects as those of Embodiments 1 and 2. In this embodiment, transparent electrodes TE1 and TE2 capable of generating heat are arranged on the array substrate AR and the counter substrate CT.

[0146] As a result, the display device DSP according to this embodiment generates a larger amount of heat per unit area of ​​the peripheral area SA than the display device DSP according to each of the above-mentioned embodiments. As a result, the display device DSP according to this embodiment can stably display images even in a lower temperature environment.

[0147] In this embodiment, the transparent electrode TE1 faces the transparent electrode TE2 in the third direction Z. A potential difference is unlikely to occur between the transparent electrodes TE1 and TE2, and the liquid crystal layer LC disposed between the transparent electrodes TE1 and TE2 is unlikely to respond. Therefore, it is not necessary to dispose the light-shielding layer BM at a position overlapping the transparent electrodes TE1 and TE2.

[0148] The amount of heat generated in the transparent electrode TE1 may be greater or smaller than the amount of heat generated in the transparent electrode TE2, or may be equal to the amount of heat generated in the transparent electrode TE2.

[0149] [Fourth embodiment] 17 is a diagram showing an example of the configuration of the transparent electrode TE1 provided in the display panel PNL in this embodiment. This embodiment differs from the first embodiment in that the transparent electrode TE1 is formed of a single electrode. The configuration of the transparent electrode TE1 in this embodiment is also applicable to the transparent electrode TE2 arranged on the counter substrate CT.

[0150] In this embodiment, the transparent electrode TE1 is also arranged between the display area DA and the first side surface SS1, between the display area DA and the second side surface SS2, between the display area DA and the third side surface SS3, and between the display area DA and the fourth side surface SS4.

[0151] The transparent electrode TE1 is formed by a single electrode TE15. The electrode TE15 has ends 15a and 15b on which terminals (not shown) are arranged. The positions at which the ends 15a and 15b are formed are not limited to the positions shown in the figure, and they can be formed at any positions.

[0152] This embodiment can also provide the same effects as those of Embodiment 1. By forming the transparent electrode TE1 as a single electrode, the overall length of the transparent electrode TE1 can be increased.

[0153] [Fifth embodiment] 18 and 19 are diagrams showing an example of the configuration of the transparent electrode TE1 provided in the display panel PNL in this embodiment. This embodiment differs from the above-described embodiments in that the transparent electrode TE1 is not arranged between the display area DA and the first side surface SS1. The configuration of the transparent electrode TE1 in this embodiment is also applicable to the transparent electrode TE2 arranged on the counter-substrate CT.

[0154] In the example shown in FIG. 18, the transparent electrode TE1 is formed by a plurality of electrodes TE12, TE13, and TE14, and in the example shown in FIG. 19, the transparent electrode TE1 is formed by a single electrode TE15.

[0155] In this embodiment, the same effects as in the first embodiment can be obtained. In this embodiment, the transparent electrode TE1 is not disposed between the display area DA and the first side surface SS1. In other words, the transparent electrode TE1 is not disposed between the display area DA and the light source LS.

[0156] This makes it possible to suppress the light emitted from the light source LS from being optically affected (interference, scattering, reflection, etc.) by the transparent electrode TE1. By ensuring that the light emitted from the light source LS is incident from the first side surface SS1, it is possible to improve the utilization efficiency of the light emitted from the light source LS. As a result, it is possible to further improve the display quality.

[0157] All display devices that can be implemented by a person skilled in the art by appropriately modifying the design based on the display devices described above as embodiments of the present invention also fall within the scope of the present invention as long as they include the gist of the present invention.

[0158] Within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications, and these modifications are also understood to fall within the scope of the present invention. For example, even if a person skilled in the art appropriately adds or deletes components or modifies the design of each of the above-described embodiments, or adds or omits steps or modifies conditions, these modifications are also included within the scope of the present invention as long as they maintain the gist of the present invention.

[0159] Furthermore, with regard to other effects brought about by the aspects described in the above embodiments, those that are clear from the description in this specification or that can be appropriately thought of by a person skilled in the art are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0160] 15...temperature sensor, 17...control circuit, 20...first wiring section, 30...second wiring section, 52...auxiliary wiring, 70...common electrode, 71...first portion, 72...second portion, 700...slit, 800...slit, AP1, AP2...opening, AR...array substrate, BM...light-shielding layer, CE...counter electrode, CT...counter substrate, DA...display area, DSP...display device, G...scanning line, LC...liquid crystal layer, PE...pixel electrode, PNL...display panel, PX...pixel, S...signal line, SA...peripheral area, TE1, TE2...transparent electrodes.

Claims

1. A display device comprising a liquid crystal layer including a polymer dispersed liquid crystal, a display panel having a display area in which an image is displayed and a peripheral area surrounding the display area; the display panel is disposed in the peripheral region and has a transparent electrode capable of heating the peripheral region; Display device.

2. the transparent electrode is not disposed in the display region, but is disposed only in the peripheral region; The display device according to claim 1 .

3. The transparent electrode has a zigzag shape. The display device according to claim 1 .

4. the display panel further includes an array substrate including a plurality of pixel electrodes arranged in the display area, and an opposing substrate overlaid on the array substrate; the counter substrate is disposed in the display region and the peripheral region, and has a counter electrode facing the plurality of pixel electrodes; the liquid crystal layer is disposed between the array substrate and the counter substrate; the transparent electrode is disposed on the array substrate; The display device according to claim 1 .

5. the array substrate further includes a common electrode facing the counter electrode and to which a voltage having the same potential as that of the counter electrode is applied; the common electrode has a first portion disposed in the display region and a second portion disposed in the peripheral region and connected to the first portion; the second portion has a first slit in which the transparent electrode is disposed; The display device according to claim 4 .

6. the array substrate further includes auxiliary wiring to which a voltage having the same potential as the common electrode is applied; the auxiliary wiring is in contact with the second portion and is not in contact with the transparent electrode; The display device according to claim 5 .

7. the display panel further includes an array substrate including a plurality of pixel electrodes arranged in the display area, and an opposing substrate overlaid on the array substrate; the counter substrate is disposed in the display region and the peripheral region, and has a counter electrode facing the plurality of pixel electrodes; the liquid crystal layer is disposed between the array substrate and the counter substrate; The transparent electrode is disposed on the opposing substrate. The display device according to claim 1 .

8. the counter electrode has a second slit in the peripheral region, in which the transparent electrode is disposed; The display device according to claim 7 .

9. the display panel further includes an array substrate including a plurality of pixel electrodes arranged in the display area, and an opposing substrate overlaid on the array substrate; the counter substrate is disposed in the display region and the peripheral region, and has a counter electrode facing the plurality of pixel electrodes; the liquid crystal layer is disposed between the array substrate and the counter substrate; the transparent electrodes are disposed on the array substrate and the counter substrate, respectively; The display device according to claim 1 .

10. the array substrate further includes a common electrode facing the counter electrode and to which a voltage having the same potential as that of the counter electrode is applied; the common electrode has a first portion disposed in the display region and a second portion disposed in the peripheral region and connected to the first portion; the second portion has a first slit in which the transparent electrode of the array substrate is disposed; the counter electrode has a second slit in the peripheral region, in which the transparent electrode of the counter substrate is disposed; The display device according to claim 9 .

11. the array substrate has a plurality of scanning lines arranged in the display region, and a first wiring portion arranged in the peripheral region and connected to the plurality of scanning lines; the transparent electrode is formed along the first wiring portion; The display device according to any one of claims 4 to 10.

12. the array substrate further includes a second wiring portion that is disposed in the peripheral region and to which a voltage having the same potential as that of the counter electrode is applied; the transparent electrode is formed along the second wiring portion; The display device according to claim 11.

13. the opposing substrate overlaps the transparent electrode and has a light-shielding layer formed in a grid pattern; The display device according to any one of claims 4 to 10.

14. the array substrate has a plurality of scanning lines arranged in the display area, a plurality of signal lines arranged in the display area and intersecting the plurality of scanning lines, and a first wiring portion arranged in the peripheral area and connected to the plurality of scanning lines; the light-shielding layer overlaps the plurality of scanning lines and the plurality of signal lines in the display region, and overlaps the first wiring portion in the peripheral region; The display device according to claim 13.

15. the array substrate further includes a second wiring portion that is disposed in the peripheral region and to which a voltage having the same potential as that of the counter electrode is applied; the light-shielding layer overlaps the second wiring portion; The display device according to claim 14.

16. an area of ​​the opening of the light-shielding layer in the display region is equal to an area of ​​the opening of the light-shielding layer in the peripheral region; The display device according to claim 13.

17. a light source that irradiates the display panel with light; the display panel further has a first side surface located between the light source and the display area, a second side surface facing in a direction opposite to the first side surface, and a third side surface and a fourth side surface connecting the first side surface and the second side surface, the transparent electrodes are arranged in the peripheral region between the display region and the second side surface, between the display region and the third side surface, and between the display region and the fourth side surface; The display device according to claim 1 .

18. the transparent electrode is further disposed in the peripheral region between the display region and the first side surface; The display device according to claim 17.

19. Further, a control circuit capable of controlling the voltage applied to the transparent electrode is provided. The display device according to claim 1 .

20. a temperature sensor for detecting the temperature around the liquid crystal layer; the control circuit controls the voltage applied to the transparent electrode based on the temperature detected by the temperature sensor.

20. The display device according to claim 19.

Images