JP4934920B2 - Display panel and display device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plurality of display panels or display units and a display device or display using the same, and more particularly to a display panel suitable for a display using a self-luminous display element and a display device using the same.
[0002]
[Background]
Recently, liquid crystal displays have become very popular and have features such as low voltage drive, low power consumption, miniaturization and thinning, etc., such as televisions, PCs (personal computers), portable information devices, mobile phones, watches, calculators, etc. Is widely used in various products.
[0003]
However, since this liquid crystal display is not self-luminous, a backlight is required to obtain a bright image. A reflective liquid crystal display that does not require a backlight has been studied, but a sufficiently satisfactory contrast has not been obtained. In addition, liquid crystal displays are not suitable for large displays because of their narrow viewing angles. Furthermore, since the display method is based on the alignment state of the liquid crystal molecules, the contrast changes depending on the angle even within the viewing angle, and the dynamic range at the time of alignment change cannot be widened, so it is not suitable for moving image display. There are also inconveniences.
[0004]
On the other hand, recently, a self-luminous display, specifically, a display using a plasma display element, an inorganic electroluminescent element, an organic electroluminescent element or the like has attracted attention. A self-luminous display
(1) Wide viewing angle compared to liquid crystal elements.
(2) Good contrast and excellent visibility.
(3) Since a backlight is not required, it can be made thinner and lighter.
It is suitable for large displays.
[0005]
[Problems to be solved by the invention]
However, when trying to obtain a large display, the size of the display panel per substrate is limited due to restrictions on the manufacturing process. For example, when an organic electroluminescent element is used, the element is formed on a glass substrate on which a conductive electrode is formed by a vacuum deposition method using a low molecule, a spin coating method using a polymer, a printing method, an ink jet method, or the like. However, in any of these methods, the size of the display panel is limited. Further, in the case of a large screen, a decrease in yield when a defect occurs in a part of the screen is unavoidable, and it is difficult to ensure in-plane uniformity. Therefore, as a method of obtaining a large-screen display, a method of bonding a plurality of display panels can be considered. However, in this method, it is important to make the boundary between adjacent display panel units inconspicuous.
[0006]
The present invention pays attention to the above points, and an object of the present invention is to provide an effective pixel configuration capable of making the boundary of bonding in a display having a divided screen configuration inconspicuous. Another object is to widen a margin in the bonding operation. Still another object is to reduce deterioration from a bonded portion, particularly when an organic electroluminescent element is used.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a display panel for obtaining a large-screen display by bonding a plurality thereof.LeOf the pixels adjacent to the bonding boundary, the area of the display area of the pixel on at least one panel surface is made smaller than the area of the display area of the pixel not adjacent to the bonding boundary.The pixel has an organic electroluminescent element and a TFT circuit for driving the organic electroluminescent element, and the characteristics of the TFT circuit of the pixel adjacent to the bonding boundary are determined by the driving current of the pixel at the bonding boundary. Set to be larger than the drive current of non-adjacent pixelsIt is characterized by that. Another invention is characterized in that a plurality of the display panels are bonded together.
[0008]
  According to the present invention, the display area (light emission area) of pixels adjacent along the bonding boundary is smaller than the display areas of other pixels. For this reason, a large margin can be taken in the bonded joint surface of the display panel.In addition, the characteristics of the TFT circuit of the pixel adjacent to the bonding boundary are set so that the driving current of the pixel is larger than the driving current of the pixel not adjacent to the bonding boundary. Since the decrease can be compensated, the boundary between the display panels becomes inconspicuous.The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
<Embodiment 1> First, Embodiment 1 of the present invention will be described with reference to FIGS.explain. In this embodiment, as shown in FIG. 2A, a large screen display is obtained by adhering display panels 20 and 30 adjacent to each other on a glass substrate (glass substrate) 10 for bonding. It is a thing. A side view seen from the direction of arrow F20 is as shown in FIG.
[0010]
The basic structures of the display panels 20 and 30 are the same, and element layers 24 and 34 including organic electroluminescent layers are provided on transparent glass substrates 22 and 32. The adhesive 12 is applied to the surfaces of the element layers 24 and 34, and the display panels 20 and 30 are bonded on the glass substrate 10 so that the bonding surfaces 26 and 36 are in contact with each other. As the adhesive 12, an ultraviolet curable resin or a thermosetting resin such as an epoxy resin is used. From each of the display panels 20 and 30, image light is output from the glass substrates 22 and 32 side as indicated by an arrow F22.
[0011]
An enlarged view of the stacked structure of the element layers 24 and 34 is as shown in FIG. A large number of transparent anode electrodes 103 are formed in a stripe pattern on the glass substrates 22 and 32 by sputtering. In the glass substrate 32, the stripe width of the transparent anode electrode 103 adjacent to the bonding surface 36 is formed to be narrower than the stripe width of the other transparent anode electrodes 103.
[0012]
Next, a hole injection layer 102, a hole transport layer 104, a light emitting layer 106, and an electron transport layer 108 are sequentially stacked on the transparent anode electrode 103 by a vacuum deposition method. As a result, the organic electroluminescent layer 111 is obtained. On the electron transport layer 108, a cathode electrode 112 and a protective layer (passivation film) 114 are laminated and formed by vacuum deposition or sputtering, respectively. Note that a hole-transporting light-emitting layer may be used instead of the hole-transporting layer 104 and the light-emitting layer 106, and an electron-transporting light-emitting layer may be used instead of the electron-transporting layer 108 and the light-emitting layer 106. Further, the electrode and each layer may be formed as a single layer with one material, or may be a laminated structure with a plurality of materials. Specific examples of these layers will be described later.
[0013]
The pixel configuration of the display panels 20 and 30 is as shown in FIG. FIG. 2A shows a state before bonding. In the display panel 20, pixels P20 are formed on the glass substrate 22 at regular intervals. The margin width at the joint surface 26 is W20. On the other hand, in the display panel 30, the pixels P30 are basically formed on the glass substrate 32 at regular intervals. However, the pixels P32 adjacent to the bonding surface 36 have a display area ( The area of the light emitting region is small (narrow). For this reason, the margin width W30 on the joint surface 36 is wider than the margin width W20 of the display panel 20.
[0014]
When these display panels 20 and 30 are bonded together as shown in FIG. 2, the result is as shown in FIG. As described above, the area of the display area of the pixel P32 adjacent to the bonding boundary (seam) 27 (or the pixel P32 arranged along the boundary 27) is set to display other pixels not adjacent to the boundary 27. By making it smaller than the area of the region, it is possible to widen the bonding margin at the boundary 27 and to perform the bonding work with a margin. In addition, the organic electroluminescence device is severely deteriorated by moisture and oxygen due to its properties. However, by taking a wide margin at the boundary 27, it becomes possible to perform good sealing between the device and the outside air. Deterioration from the part is reduced.
[0015]
By the way, since the display area of the pixel P32 is narrow, the light emission luminance is lowered. Therefore, in the present embodiment, the light emission luminance of the pixel P32 is compensated so that the light emission luminance is equivalent to that of the other pixels P20 and P30. For example, as shown in FIG. 1B, when the scanning line drive circuit 14 and the data line drive circuit 16 are provided, an amplifier 16A is provided in the data line drive unit of the pixel P32. By amplifying the data signal supplied to the pixel P32 by the amplifier 16A, the luminance of the pixel P32 increases and becomes the same as other pixels. As a result, a decrease in luminance due to a decrease in pixel area is compensated, and the boundary between the display panels 20 and 30 becomes inconspicuous.
[0016]
Note that the response time of the pixel P32 may be longer than the response time of the pixels P30 and P20. Further, even if the peak luminance of the pixel P32 is increased and the average luminance is substantially the same between the pixel P32 and the other pixels P20 and P30, the boundary 27 between the display panels 20 and 30 can be made inconspicuous. is there.
[0017]
  In the case of active matrix driving, a TFT (Thin Film Transistor) circuit that drives the pixel P32 may be used instead of the amplifier 16A. That is, the characteristics of the TFT circuit that drives the pixel P32 are set in advance so that the drive current increases. The TFT circuit has a configuration as shown in FIG. 3, for example. The TFT 1 is for conversion, the TFT 2 is for driving, the TFT 3 is for taking in, and the TFT 4 is for switching. The gate of the TFT 3 is connected to the scanning line A, and the gate of the TFT 4 is connected to the scanning line B. TFT2 is connected in series to an organic electroluminescent element (shown as OLED in the figure)SymmetryTFT1 is provided on the surface.
[0018]
The potentials of the scanning lines A and B change as shown in FIGS. 4 (A) and 4 (B), respectively. Here, as shown in FIG. 5C, a signal current Iw corresponding to the luminance flows through the data line C, and the voltage generated between the gate and the source of the TFT 1 as a result is Vgs. When the signal voltage of the scanning line B becomes “H” (timing Ta in FIG. 4), the TFT 4 becomes conductive, and the gate and drain of the TFT 1 are short-circuited. Therefore, TFT1 operates in the saturation region. Next, when the signal voltage of the scanning line A becomes “L” (timing Tb in FIG. 4), the TFT 3 becomes conductive and the signal current Iw is taken into the TFT 1. That is, a current corresponding to valid data flows through the TFT 1.
[0019]
The signal current Iw is given by the following equation.
Iw = μ1, Cox1, W1 / L1 / 2 (Vgs-Vth1)²            ...... (1)
Here, μ1 represents carrier mobility in TFT1, Cox1 represents gate capacitance per unit area of TFT1, W1 represents channel width of TFT1, L1 represents channel length of TFT1, and Vth1 represents threshold value of TFT1.
[0020]
On the other hand, if the drive current flowing through the organic electroluminescent element is Idrv, this Idrv is controlled by the TFTs 2 connected in series. In the circuit of FIG. 3, since the capacitor C is connected, the gate-source voltage of the TFT2 matches the gate-source voltage Vgs of the TFT1. Therefore, assuming that TFT2 also operates in the saturation region,
Idrv = μ2, Cox2, W2 / L2 / 2 (Vgs-Vth2)²            (2)
It becomes. Here, μ2 is the carrier mobility in TFT2, Cox2 is the gate capacitance per unit area of TFT2, W2 is the channel width of TFT2, L2 is the channel length of TFT2, and Vth2 is the threshold of TFT2.
[0021]
Here, since the TFT1 and the TFT2 are formed close to each other in a small pixel region, it can be considered that the element characteristics of the TFT1 and the TFT2 are almost the same, and it can be considered that μ1 = μ2, Cox1 = Cox2, and Vth1 = Vth2. . Then, from the equations (1) and (2), Idrv / Iw = (W2 / L2) / (W1 / L1) (3)
It becomes. According to this, the relationship between the signal current Iw and the drive current Idrv of the organic electroluminescent element OLED does not depend on the carrier mobility μ, the gate capacitance Cox, and the threshold value Vth, which vary from pixel to pixel, from product to product, and from production lot to It is determined by the channel width W and channel length L of the TFT.
[0022]
Accordingly, by appropriately setting the channel widths W1 and W2 and the channel lengths L1 and L2 of the TFTs 1 and 2, it is possible to control the value of the drive current Idrv of the organic electroluminescent element OLED with respect to the signal current Iw. If such a TFT circuit is used, a circuit pattern on the TFT side is set so that the drive current of the pixel P32 adjacent to the bonding surface 36 of the display panel 30 is considerably larger than the drive current of the other pixels P30. Is previously set, the amplifier 16A of the data line driver circuit 16 shown in FIG. 1B can be omitted.
[0023]
Second Embodiment Next, a second embodiment will be described with reference to FIG. In addition, the same code | symbol is used for the component corresponding to Embodiment 1 mentioned above. In the first embodiment, the display area of one end pixel of the display panels to be bonded is reduced, but in this embodiment, the display area is set small for the end pixels of both display panels.
[0024]
FIG. 5A shows a state of the pixel configuration of the display panels 30 and 21 before bonding. The pixel P22 adjacent to the joint surface 26 of the display panel 21 has a display area compared to the other pixels P20. The area is small. For this reason, the margin width W22 in the joint surface 26 is wider than the margin width W20 in the display panel 20 of the example, and is substantially equal to the margin width W30 in the display panel 30 of the example.
[0025]
When these display panels 21 and 30 are bonded together as shown in FIG. 2, the result is as shown in FIG. As described above, by reducing the area of the display area of the pixels P22 and P32 adjacent to the joint surfaces 26 and 36, a wide margin for bonding can be secured on the joint surfaces 26 and 36. It becomes possible to perform the pasting work. In addition, the organic electroluminescence device is severely deteriorated by moisture and oxygen due to its properties, but by taking a wide margin on the bonding surfaces 26 and 36, the device and the outside air can be well sealed. Deterioration from the bonding site is reduced.
[0026]
By the way, in this example, not only the pixel P32 but also the pixel P22 has a small display area, and thus the light emission luminance decreases. Therefore, a device for increasing the signal intensity is applied not only to the pixel P32 but also to the pixel P22 as described above.
[0027]
The example of FIG. 5C is an example in which two pixels P22 and P32 adjacent to each other at the bonding site (bonding boundary) are regarded as one pixel in a pseudo manner. That is, the pseudo pixels PF surrounded by the dotted lines are driven simultaneously by the simultaneous drive circuit 16B of the data line drive circuit 16. If the display area of the pixels P22 and P32 is half that of the other pixels P20 or P30, the display area of the pseudo pixel PF is equivalent to that of the other pixels P20 or P30, and as a result, the same luminance can be obtained. it can.
[0028]
Third Embodiment Next, a third embodiment will be described with reference to FIG. The present invention can be applied not only to a monochrome display but also to a color display. When the above embodiment is applied to color display, R (red), G (green), and B (blue) pixels may be arranged in a certain order such as stripes, mosaics, squares, and deltas. The display area of the pixel adjacent to the boundary may be set smaller than the display area of the other pixels.
[0029]
In the example shown in FIG. 6A, each of the display panels 100 and 110 to be bonded has R, G, and B pixels in a delta arrangement. In the present embodiment, among the pixels of the display panels 100 and 110, the pixels P100g, P100r, P110g, and P110b adjacent to the junction boundary 120 are set to have a smaller display area than the other pixels. Margins W100 and W110 are respectively provided. The pixels P100g and P110g may be driven separately or may be combined into one pseudo pixel.
[0030]
FIG. 6B is a modification of FIG. 6A, and for the R and B pixels of the display panels 101 and 111, the display area of all the pixels including the vicinity of the boundary is the same, and the junction boundary The display areas of the G pixels P101g and P111g adjacent to 120 are set small, and the margins W101 and W111 are widened. Also in this example, the pixels P101g and P111g may be driven separately or may be combined into one pseudo pixel.
[0031]
  In any of the examples, the display area of the G pixel is particularly small compared to the R and B pixels, but the human eye has high sensitivity to the G light as represented by the visibility curve. Therefore, even if the area of the G pixel is slightly reduced, if the average luminance is adjusted by supplying a compensation current to the G pixel, the luminance does not decrease much.Yes.
[0032]
<Fourth Embodiment> Next, a fourth embodiment will be described with reference to FIG. This embodiment is an example in which display panels 200, 210, 220, and 230 are bonded together as shown in FIG. In this example, the pixel P202 adjacent to the joint surface or boundary 240, 242 of each panel is set to have a smaller width and length than the other pixels P200. A pseudo pixel P204 indicated by a dotted line is configured by combining four adjacent pixels P202. According to this example, a large margin W200 can be obtained on any of the joint surfaces 240 and 242 with which the display panels 200, 210, 220, and 230 are in contact, and the continuity of pixels across the boundaries 240 and 242 is also good. is there.
[0033]
<Embodiment 1> Next, an embodiment that is experimentally produced with respect to the present invention will be described. First, Example 1 will be described with reference to the cross section of the main part of FIG. 8A and the chemical structural formula of FIG. This example is an example of a passive drive type. A glass substrate 300 of 500 mm × 500 mm is prepared, and ITO having a film thickness of about 100 nm is formed thereon by sputtering. The ITO is patterned in a stripe shape using a wet etching technique. The stripe width is, for example, 500 μm, that is, a 500 μm pixel pitch. At this time, the stripe width of the ITO adjacent to the bonding surface for bonding the substrates is 0.25 μm, and a margin for bonding of 0.25 μm is obtained to the end. Such striped ITO becomes the transparent anode electrode 302.
[0034]
Next, an organic electroluminescent layer is formed on the transparent anode electrode 302. First, m-MTDATA (4,4 ′, 4 ″ -tris (3-methylphenylphenylamino) triphenylamine, the structural formula is shown in FIG. 9A) is used as the hole injection layer 304 over the entire main surface of the substrate. The film is formed at a thickness of 2 to 0.4 nm / sec and 30 nm under vacuum by a vacuum deposition method. Next, α-NPD (α-naphtyl phenyl diamine, see FIG. 9B for the structural formula) is used as the hole transport layer 306 under vacuum by a vacuum deposition method at a deposition rate of 0.2 to 0.4 nm / sec. To 30 nm. Next, as the electron-transporting light-emitting layer 308, Alq₃(8-hydroxy quinorine alminum, see FIG. 9C for the structural formula) is deposited at a deposition rate of 0.2 to 0.4 nm / sec. The organic electroluminescent layer 310 is formed by the above layers.
[0035]
Next, the cathode electrode 312 is formed by vacuum deposition in a direction orthogonal to the stripe direction of the transparent anode electrode 302. That is, using a cathode electrode deposition mask in which slit-like openings having a width of 1 mm are arranged at a pitch of 500 μm, an Mg—Ag alloy (for example, Mg: Ag = 9: 1 in a film thickness ratio) is deposited at a deposition rate of 0. The cathode electrode 312 is obtained by depositing about 0.5 nm at 3 nm / sec or less. Next, an AlSiCu alloy (Si is 0.5 wt (wt%), Cu is 1 wt%) is deposited as a cathode electrode sealing layer 314 by 200 nm, and an AuGe alloy (Ge is formed as a conductive sealing layer 316). 12 wt%) is deposited at 200 nm.
[0036]
Next, on the conductive sealing layer 316, as the inorganic sealing layer 318, SiNx is formed to a thickness of 2 μm by plasma CVD. Note that the inorganic sealing layer 318 is formed using a predetermined mask in addition to a portion where the transparent anode electrode 302 or the cathode electrode 312 contacts the external circuit.
[0037]
  For display panels with organic electroluminescent element matrix thus fabricated, FIG.Lamination is performed as shown in (1). A glass substrate of 900 mm × 450 mm is prepared as a glass substrate for bonding, and UV resin (ultraviolet curable resin) is applied thereon. The display panel was placed on the glass substrate for bonding so that the area where the inorganic sealing layer 318 other than the contact was formed was in contact with the UV resin, and UV irradiation was performed to bond the two together. At this time, conditions for eliminating the flatness of the glass interface and the protrusion of the UV resin were determined.
[0038]
In the bonding of the bonded organic electroluminescence matrix display produced in this way, the image was displayed so that the two sub-bixels sandwiching the interface became one unit of pseudo pixel. That is, the matrix drive is performed in the embodiment as shown in FIG. As a result of observing the display image, it was possible to drive the display panel without conspicuous the junction.
[0039]
Example 2 Next, Example 2 will be described with reference to FIGS. 8B and 10. In addition, the same code | symbol is used for the component corresponding to Example 1 mentioned above. This embodiment is an example applied to a TAC (TOP Emitting Adoptive Current Drive) display panel. On a 500 mm × 500 mm evaluation low-temperature polysilicon TFT substrate 400, a pixel driving TFT 402 having a size basically the same as the above size is arranged. Then, a Cr layer to be the anode electrode 404 is formed thereon, and an opening of a light emitting area having a width of 500 μm and a length of 1 mm is formed as Si0.₂Patterning is used. The basic pixel arrangement of this embodiment is the same as that of the first embodiment. In this embodiment, two subpixels formed as described above are treated as one unit pixel (pseudo pixel).
[0040]
Next, an organic electroluminescent layer is manufactured. A hole injection layer 304, a hole transport layer 306, and an electron transport light emission are formed on the main surface of the substrate so as to cover the light emitting area using a mask having a dot-type opening. Layers 308 are sequentially stacked. As a result, an organic electroluminescent layer 310 similar to that in Example 1 is obtained. Then, an MgAg alloy (for example, Mg: Ag = 9: 1 in a film thickness ratio) is deposited on the entire surface of the organic electroluminescent layer 310 so as to cover the light emitting surface of the organic electroluminescent layer 310 at a deposition rate of 0.3 nm / sec or less. The cathode electrode 312 is obtained by depositing 0.5 nm. Next, an inorganic sealing layer 318 is formed on the cathode electrode 312 in the same manner as in Example 1.
[0041]
  For display panels with organic electroluminescent element matrix thus fabricated, FIG.Bonding as shown in (A) is performed. A state at the time of bonding is shown in FIG. In the figure, the light emission direction indicated by the arrow F400 is shown in an upward direction. A 900 mm × 450 mm glass substrate is prepared as the glass substrate 10 for bonding, and a UV resin (ultraviolet curable resin) 406 is applied thereon. In this example, since light output from the organic electroluminescent layer 310 is output to the outside through the UV resin 406, a transparent material is used even after curing by UV irradiation. Then, by placing the display panels 450 and 460 on the glass substrate 10 for bonding so that the area where the inorganic sealing layer 318 other than the contact is formed is in contact with the UV resin 406, UV irradiation is performed. Both were bonded together.
[0042]
In the bonding of the bonded organic electroluminescence matrix display produced in this way, the image was displayed so that the two sub-bixels sandwiching the interface became one unit of pseudo pixel. That is, the matrix drive is performed in the embodiment as shown in FIG. As a result of observing the display image, it was possible to drive the display panel without conspicuous the junction.
[0043]
The present invention has many embodiments, and various modifications can be made based on the above disclosure. For example, the following are included.
(1) In the above-described embodiment, the area of the display region or the display region is reduced by reducing the length or width of the pixel adjacent to the joint surface, but the region shape may be an appropriate shape. One pixel may include a larger number of regions. In this case, each region may be connected by an auxiliary electrode and driven simultaneously.
(2) As a material of each part, you may use various well-known things other than what was mentioned above. Further, each of the above-described layers may have a known laminated structure, and if necessary, a filter or a black matrix may be provided. In particular, it is effective to provide a filter or a black matrix so as to hide the bonding site.
(3) In the above-described embodiment, the base for bonding is used. However, only the display panel may be bonded, and any bonding method may be applied.
(4) The above embodiment is an example in which the present invention is applied to a display using an organic electroluminescent element, but can be similarly applied to a display using a plasma light emitting element or an inorganic electroluminescent element. Further, the display driving method can be applied to either a passive type (simple matrix type) or an active type (TFT driving type).
[0044]
【The invention's effect】
As described above, the present invention has the following effects.
(1) Among the pixels adjacent to the bonding boundary of the display panel, the area of the display area of the pixel on at least one panel surface is made smaller than the area of the display area of the pixel not adjacent to the bonding boundary. The margin on the surface is increased, the bonding work can be performed with a margin, and the deterioration of the element from the bonded portion can be reduced.
(2) Since the luminance of the pixel whose area has been reduced is compensated, the boundary between bonding becomes inconspicuous and a good large-screen display becomes possible.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a pixel configuration according to a first embodiment of the present invention.
FIG. 2 is a view showing a state of bonding and a laminated structure of an organic electroluminescent layer in the first embodiment.
FIG. 3 is a circuit diagram illustrating an example of a TFT drive circuit.
FIG. 4 is a time chart showing the operation of the TFT drive circuit.
FIG. 5 is a plan view showing a main part of a pixel configuration according to Embodiment 2 of the present invention.
FIG. 6 is a plan view showing a main part of a pixel configuration according to Embodiment 3 of the present invention.
FIG. 7 is a plan view showing a main part of a pixel configuration according to Embodiment 4 of the present invention.
FIG. 8 is a main cross-sectional view showing a laminated structure of organic electroluminescent layers in an example of the present invention.
FIG. 9 is a view illustrating a chemical structural formula of a main part of the organic electroluminescent layer.
10 is a cross-sectional view showing a schematic configuration of a TAC type of Example 2. FIG.
[Explanation of symbols]
10 ... Glass substrate
12 ... Adhesive
14 ... Scanning line driving circuit
16: Data line driving circuit
16A ... Amplifier
16B ... Simultaneous drive circuit
20, 21, 30 ... display panel
22, 32 ... Glass substrate
24, 34 ... element layer
26, 36 ... joint surface
27 ... Boundary
100, 101, 110, 111 ... display panel
102 ... Hole injection layer
103 ... Transparent anode electrode
104 ... Hole transport layer
106: Light emitting layer
108 ... electron transport layer
111 ... Organic electroluminescent layer
112 ... Cathode electrode
114 ... Protective layer
120 ... Boundary or joint surface
200, 210, 220, 230 ... display panel
240, 242, boundary or joint surface
300 ... Glass substrate
302 ... Transparent anode electrode
304 ... Hole injection layer
306 ... Hole transport layer
308 ... Electron transporting light emitting layer
310: Organic electroluminescent layer
312 ... Cathode electrode
314 ... Cathode electrode sealing layer
316: Conductive sealing layer
318 ... Inorganic sealing layer
400 ... Board
402 ... TFT
404 ... Anode electrode
406 ... Resin
450, 460 ... display panel
OLED: Organic electroluminescence device
P20, P22, P30, P32, P100g, P100r, P101g, P110g, P110b, P111g, P200, P202 ... Pixel
PF, P204 ... pseudo pixel
W20, W22, W30, W100, W101, W110, W111, W200 ... margin

Claims (8)

Among the pixels adjacent to the bonding boundary of the display panel to obtain a large screen display by bonding a plurality, the area of the display region of the pixel of at least one panel surface, a pixel not adjacent to the bonded boundary Smaller than the area of the display area ,
The pixel has an organic electroluminescent element and a TFT circuit for driving the organic electroluminescent element,
The characteristics of the TFT circuit of the pixel adjacent to the bonding boundary are set so that the driving current of the pixel is larger than the driving current of the pixel not adjacent to the bonding boundary.
Table display panel. The area of the display area of all pixels adjacent to the bonding boundary of the display panel is made smaller than the area of the display area of pixels not adjacent to the bonding boundary .
請 Motomeko 1 display panel described. The TFT circuit has a driving TFT connected in series to the organic electroluminescence device, and a conversion TFT provided symmetrically with the driving TFT.
The display panel according to claim 1 , wherein brightness of a pixel having a small area of the display region is compensated by setting channel widths and channel lengths of the driving TFT and the conversion TFT . 4. The display panel according to claim 3 , wherein a value of a driving current of the organic electroluminescent element is controlled by setting a channel width and a channel length of the driving TFT and the conversion TFT . Becomes the display panel Te multiple pieces stuck Riawase,
Of the pixels adjacent to the bonding boundary of the display panel, the area of the display area of the pixel on at least one panel surface is smaller than the area of the display area of the pixel not adjacent to the bonding boundary ,
The pixel has an organic electroluminescent element and a TFT circuit for driving the organic electroluminescent element,
The characteristics of the TFT circuit of the pixel adjacent to the bonding boundary are set so that the driving current of the pixel is larger than the driving current of the pixel not adjacent to the bonding boundary.
Viewing equipment. The area of the display area of all pixels adjacent to the bonding boundary of the display panel is made smaller than the area of the display area of pixels not adjacent to the bonding boundary .
請 Motomeko 5 display device as claimed. The TFT circuit has a driving TFT connected in series to the organic electroluminescence device, and a conversion TFT provided symmetrically with the driving TFT.
The display device according to claim 5 , wherein luminance of a pixel having a small area of the display region is compensated by setting channel widths and channel lengths of the driving TFT and the conversion TFT . The display device according to claim 5 , wherein the drive current value of the organic electroluminescent element is controlled by setting channel widths and channel lengths of the drive TFT and the conversion TFT .

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