WO2016117609A1 - 表示装置 - Google Patents
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- WO2016117609A1 WO2016117609A1 PCT/JP2016/051586 JP2016051586W WO2016117609A1 WO 2016117609 A1 WO2016117609 A1 WO 2016117609A1 JP 2016051586 W JP2016051586 W JP 2016051586W WO 2016117609 A1 WO2016117609 A1 WO 2016117609A1
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- display device
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- 239000004065 semiconductor Substances 0.000 claims abstract description 148
- 239000010409 thin film Substances 0.000 claims abstract description 75
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000010408 film Substances 0.000 description 98
- 239000010410 layer Substances 0.000 description 69
- 239000003990 capacitor Substances 0.000 description 44
- 101100214488 Solanum lycopersicum TFT2 gene Proteins 0.000 description 39
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- 101100489584 Solanum lycopersicum TFT1 gene Proteins 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
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- 238000005401 electroluminescence Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Definitions
- the present invention relates to a display device.
- Display devices composed of pixels having thin film transistors, such as liquid crystal display devices and organic EL display devices, have become widespread.
- Patent Document 1 discloses a thin film transistor including a back gate electrode below a semiconductor layer and a front gate electrode above the semiconductor layer.
- Patent Document 2 discloses a thin film transistor provided with an upper gate electrode and a lower back gate electrode of a semiconductor thin film.
- JP 2009-43748 A Japanese Patent Laid-Open No. 5-114732
- the kink phenomenon is a phenomenon in which the Vd-Id characteristic is different from that of a general thin film transistor, and is also called an impact ion phenomenon in which a large amount of hot electrons are generated by a strong electric field at the drain end.
- the present invention has been made in view of the above problems, and an object thereof is to provide a technique for suppressing the occurrence of a kink phenomenon in a thin film transistor and improving the image quality of a display device.
- the display device includes a thin film transistor provided in each of a plurality of pixels arranged in a matrix, and the thin film transistor includes a semiconductor layer, a first insulating layer provided below the semiconductor layer, and the semiconductor layer A second insulating layer provided on an upper layer of the semiconductor layer, and a gate electrode facing the semiconductor layer with a space therebetween, wherein the semiconductor layer includes a source region, a drain region, the source region, and the drain region. And a top surface, a bottom surface, and a side surface connected to the top surface and the bottom surface and having a portion included in the channel region, and the gate electrode includes the first insulating layer.
- the occurrence of the kink phenomenon can be suppressed and the image quality of the display device can be improved.
- FIG. 3 is a plan view illustrating an example of a pixel circuit according to the first embodiment.
- FIG. FIG. 3 is a cross-sectional view taken along the line III-III of the pixel circuit shown in FIG. It is a top view which shows an example of the thin-film transistor concerning 1st Embodiment.
- FIG. 5 is a cross-sectional view taken along the line VV of the thin film transistor shown in FIG. 4. It is a top view which shows another example of a thin-film transistor. It is a top view which shows another example of a thin-film transistor.
- FIG. 8 is a cross-sectional view taken along the line VIII-VIII of the thin film transistor shown in FIG. It is a top view which shows another example of a thin-film transistor. It is a top view which shows another example of a thin-film transistor. It is a top view which shows an example of the pixel circuit concerning 2nd Embodiment.
- FIG. 12 is a cross-sectional view taken along the line XII-XII of the pixel circuit shown in FIG. It is a top view which shows an example of the thin-film transistor concerning 2nd Embodiment.
- FIG. 14 is a cross-sectional view taken along the line XIV-XIV of the thin film transistor shown in FIG. 13.
- FIG. 17 is a cross-sectional view taken along the line XVII-XVII of the thin film transistor shown in FIG. It is a top view which shows another example of a thin-film transistor. It is a top view which shows another example of a thin-film transistor. It is a top view which shows another example of a thin-film transistor.
- FIG. 21 is a cross-sectional view taken along the line XXI-XXI of the thin film transistor shown in FIG. 20.
- the display device includes a pixel circuit including a thin film transistor such as a liquid crystal display device. Other types of display devices may be used.
- the organic EL display device includes an array substrate SUB (see FIG. 3), a counter substrate facing the array substrate SUB, a flexible circuit substrate connected to the array substrate SUB, and a driver integrated circuit. Circuit.
- a color filter is provided on the counter substrate, and a full color display is realized by a combination of the color filter and a white OLED (Organic Light Emitting Diode).
- a white OLED Organic Light Emitting Diode
- FIG. 1 is a circuit diagram showing an example of an equivalent circuit of the organic EL display device according to the first embodiment.
- the circuit shown in FIG. 1 is physically formed on the array substrate SUB (see FIG. 3) or in the driver integrated circuit.
- a plurality of pixel circuits PC, a plurality of gate signal lines GL, a plurality of data signal lines SL, and a power supply line PL are arranged on the array substrate SUB.
- the plurality of pixel circuits PC are arranged in a matrix in the display area of the array substrate SUB.
- Each pixel circuit PC corresponds to one display pixel.
- One gate signal line GL is provided for each row of the pixel circuits PC, and each of the gate signal lines GL is connected to the pixel circuit PC constituting the corresponding row.
- One data signal line SL is provided for each column of the pixel circuits PC, and each of the data signal lines SL is connected to the pixel circuit PC constituting the corresponding column.
- One end of the plurality of gate signal lines GL is connected to the drive circuit YDV, and one end of the plurality of data signal lines SL is connected to the drive circuit XDV.
- the drive circuit YDV outputs a scanning signal to the gate signal line GL, and the drive circuit XDV supplies the video signal potential corresponding to the display gradation of the pixel to the data signal line SL.
- Each pixel circuit PC includes a thin film transistor TFT1, a thin film transistor TFT2, a capacitor CS, and a light emitting element LE.
- the thin film transistor TFT1 is turned on in response to the scanning signal supplied from the gate signal line GL, and at that time, the potential based on the video signal supplied from the data signal line SL is stored in the capacitor CS.
- the thin film transistor TFT2 controls the amount of current flowing between the source and the drain based on the potential difference stored in the capacitor CS.
- the light emitting element LE is an OLED and emits light with an intensity corresponding to the amount of current controlled by the thin film transistor TFT2.
- the source electrode of the thin film transistor TFT2 is connected to the power supply line PL, and the drain electrode is connected to the light emitting element LE.
- the capacitor CS is provided between the gate electrode and the source electrode of the thin film transistor TFT2.
- the pixel circuit PC is not limited to that shown in FIG. 1, and may be a pixel circuit PC in which the thin film transistor TFT2 controls the voltage applied to the light emitting element LE.
- FIG. 2 is a plan view showing an example of the pixel circuit PC according to the first embodiment.
- 3 is a cross-sectional view taken along the line III-III of the pixel circuit PC shown in FIG.
- Each of the pixel circuits PC is mainly disposed in a region surrounded by adjacent data signal lines SL and adjacent gate signal lines GL.
- the power supply line PL is adjacent to the left side of each data signal line SL and extends in the vertical direction.
- channel semiconductor films SC and SD as elements constituting the pixel circuit PC, channel semiconductor films SC and SD, an upper gate electrode HG, a lower gate electrode LG, and a lateral gate electrode SG (see FIG. 3).
- the channel semiconductor film SD forms a thin film transistor TFT1 together with a portion of the gate signal line GL that is above the channel semiconductor film SD.
- the channel semiconductor film SC, the upper gate electrode HG, the lower gate electrode LG, and the lateral gate electrode SG (see FIG. 3) constitute the thin film transistor TFT2.
- the first capacitor electrode CE1, the second capacitor electrode CE2, and the third capacitor electrode CE3 constitute a capacitor CS.
- One electrode of the capacitor CS is the second capacitor electrode CE2, and the other electrode is the first capacitor electrode. This corresponds to CE1 and the third capacitor electrode CE3.
- the first capacitor electrode CE1 is formed integrally with the lower gate electrode LG
- the second capacitor electrode CE2 is electrically connected to the channel semiconductor film SC via the power line PL
- the third capacitor electrode CE3 is It is formed integrally with the gate electrode HG.
- an undercoat UC As shown in FIG. 3, on the array substrate SUB, an undercoat UC, a first conductive layer to be described later, a first gate insulating layer IN1, a semiconductor layer to be described later, a second gate insulating layer IN2, and a first to be described later.
- 2 conductive layers, an interlayer insulating layer IN3, a third conductive layer described later, a planarization layer PI, a layer including the anode PE, and a layer including the bank BK are stacked in this order.
- an OLED layer, a cathode layer, a sealing layer, and the like are laminated on the layer including the bank BK.
- the first conductive layer includes a lower gate electrode LG and a first capacitor electrode CE1, and the semiconductor layer includes a channel semiconductor film SC, a channel semiconductor film SD (see FIG. 2), a second capacitor electrode CE2,
- the conductive layer includes a gate signal line GL, an upper gate electrode HG, and a third capacitor electrode CE3.
- the second conductive layer includes a lateral gate electrode SG made of a conductor filling the contact holes CH1 and CH2.
- the third conductive layer includes a jumper wiring WJ, a power supply line PL (see FIG. 2), and a data signal line SL (see FIG. 2).
- An OLED layer (not shown) is in contact with the anode PE in the bank opening OP, and a region in contact with the anode PE is a region where the organic EL element emits light.
- the channel semiconductor film SD is connected to the data signal line SL via the contact hole CH4 on the upper side of the gate signal line GL on the upper side of FIG. 2 when viewed from the center of the pixel circuit PC.
- the channel semiconductor film SD extends rightward in the drawing from the position of the contact hole CH4, passes under a part of the gate signal line GL (protrusion extending upward), then goes downward, and passes under the gate signal line GL. It extends to the tip.
- a contact hole CH3 is formed in the upper layer of the extended portion.
- the channel semiconductor film SC extends to the left and right in the figure slightly above the center of the pixel circuit PC as seen in FIG.
- the right end of channel semiconductor film SC is connected to power supply line PL through contact hole CHS.
- the left end of the channel semiconductor film SC is bent slightly upward, and the bent end is connected to the anode PE via the contact hole CHD.
- the lower gate electrode LG and the upper gate electrode HG are provided so as to planarly overlap a portion excluding an end in a region extending to the left and right of the channel semiconductor film SC.
- the lower gate electrode LG and the upper gate electrode HG are connected to each other by a lateral gate electrode SG provided on the side of the channel semiconductor film SC and perpendicular to the extending direction of the channel semiconductor film SC (see FIG. 3). .
- the lateral gate electrode SG is mainly provided in the contact holes CH1 and CH2.
- the upper gate electrode HG protrudes further upward in FIG. 2 from a position beyond the upper contact hole CH1 in FIG. 2 when viewed from the channel semiconductor film SC.
- the protruding portion is connected to the jumper wiring WJ in the upper layer through the contact hole CHG, and the jumper wiring WJ is connected to the channel semiconductor film SD through the contact hole CH3.
- the first capacitor electrode CE1 extends upward from the lower end of the pixel circuit PC (see FIG. 1) as viewed in FIG. 2, and has a shape in which a cutout is provided in a region where the thin film transistor TFT1 is provided with respect to the rectangle.
- the first capacitor electrode CE1 and the lower gate electrode LG are integrated on the lower side of the contact hole CH2 in FIG.
- the second capacitor electrode CE2 faces the first capacitor electrode CE1 and is provided so as to overlap in plan view.
- the second capacitor electrode CE2 extends from slightly above the lower end of the first capacitor electrode CE1 to just before the contact hole CH2 as viewed in FIG. Yes. Second capacitor electrode CE2 is connected to power supply line PL via contact hole CH6.
- the source of the thin film transistor TFT2 and the second capacitor electrode CE2 are electrically connected via the power line PL.
- the second capacitor electrode CE2 may be directly connected to the source-side end of the channel semiconductor film SC.
- the third capacitor electrode CE3 extends slightly upward from the lower end of the second capacitor electrode CE2.
- the third capacitor electrode CE3 has a shape in which a notch is provided in a certain region of the thin film transistor TFT1 with respect to a rectangle.
- the third capacitor electrode CE3 and the upper gate electrode HG are integrated on the lower side of the contact hole CH2 in FIG.
- the first capacitor electrode CE1 and the second capacitor electrode CE2 are electrically connected via a lateral gate electrode SG (see FIG. 3), whereby the capacitor CS has a sandwich structure, and only two electrodes The capacitance of the capacitor is larger than when facing each other.
- FIG. 4 is a plan view showing an example of the thin film transistor TFT2 according to the first embodiment
- FIG. 5 is a cross-sectional view taken along the line VV of the thin film transistor TFT2 shown in FIG. 4 and 5 are diagrams showing the thin film transistor TFT2 alone excluding the electrodes constituting the capacitor CS.
- the description of the undercoat UC is omitted.
- the channel semiconductor film SC extends from the drain end in contact with the anode PE through the contact hole CHD to the source end in contact with the power supply line PL through the contact hole CHS.
- the channel portion between the source end and the drain end has a band shape in plan view.
- a portion overlapping the lower gate electrode LG or the upper gate electrode HG in a planar manner is a channel region, and a portion closer to the drain end than the channel region is a drain region, A region closer to the source than the channel region is referred to as a source region.
- the lower gate electrode LG, the upper gate electrode HG, and the lateral gate electrode SG constitute a gate electrode of the thin film transistor TFT2.
- the lower gate electrode LG faces the channel semiconductor film SC below via the gate insulating layer IN1
- the upper gate electrode HG faces the channel semiconductor film SC above via the gate insulating layer IN2.
- the lateral gate electrode SG opposes in a direction orthogonal to the direction in which the channel semiconductor film SC extends from the source region to the drain region and on the side of the channel semiconductor film SC (hereinafter referred to as “width direction”).
- the lateral gate electrode SG connects the lower gate electrode LG and the upper gate electrode HG.
- the direction in which the channel semiconductor film SC extends from the source region toward the drain region is the direction between the source region and the drain region with respect to the channel semiconductor film SC.
- this direction is referred to as “the direction in which the channel semiconductor film SC extends”. Also described.
- the gate insulating layer IN1 and the gate insulating layer IN2 there is no semiconductor film between the gate insulating layer IN1 and the gate insulating layer IN2, and there are portions where they are stacked. This part is called a laminated part.
- the upper surface of the gate insulating layer IN1 and the lower surface of the gate insulating layer IN2 are in contact with each other.
- a part of the stacked portion is interposed between the channel semiconductor film SC and the lateral gate electrode SG, and prevents the channel semiconductor film SC and the lateral gate electrode SG from being electrically connected.
- the channel region of the channel semiconductor film SC includes an overlapping opposing region that faces both the lower gate electrode LG and the upper gate electrode HG, and a one-side opposing region that faces only one of the lower gate electrode LG and the upper gate electrode HG.
- the one-side facing region in the direction in which the channel semiconductor film SC extends is on both sides of the overlapping facing region. In other words, in plan view, both ends (ends on the source region side and drain region side) of the channel semiconductor film SC in the direction between the source region and the drain region are from the upper gate electrode HG and the lower gate electrode LG. It protrudes.
- the first position where the channel semiconductor film SC protrudes from the lower gate electrode LG is shifted from the second position where the channel semiconductor film SC protrudes from the upper gate electrode HG.
- the first position is outside the second position in the direction in which the channel semiconductor film SC extends, and the length of the lower gate electrode LG in the extending direction is the length of the upper gate electrode HG. Greater than the length in that direction.
- the lower gate electrode LG has a size that exceeds the portion facing the entire upper gate electrode HG.
- the relationship between the upper gate electrode HG and the lower gate electrode LG may be different from the example of FIG.
- the second position is located outside the first position in the direction in which the channel semiconductor film SC extends, and the length of the lower gate electrode LG in the extending direction is smaller than the length of the upper gate electrode HG in the direction. Also good.
- the upper gate electrode HG has a size exceeding the portion facing the entire lower gate electrode LG.
- Contact holes CH1 and CH2 are provided in the stacked portion.
- the contact holes CH1 and CH2 face both sides of the channel semiconductor film SC as viewed in the width direction.
- the contact hole CH1 is below the channel semiconductor film SC
- the contact hole CH2 is above the channel semiconductor film SC.
- Each of the contact holes CH1 and CH2 has a shape that continuously extends along the channel semiconductor film SC and penetrates the stacked portion. In the direction in which the channel semiconductor film SC extends, the length of each of the contact holes CH1 and CH2 is shorter than the length of the upper gate electrode HG, and each end of the contact holes CH1 and CH2 has an upper gate electrode HG (lower) in plan view. The smaller one of the gate electrode LG and the upper gate electrode HG).
- the region of the lower gate electrode LG facing the channel semiconductor film SC is the first region
- the region of the upper gate electrode HG facing the channel semiconductor film SC is the second region
- the region of the lateral gate electrode SG is the channel.
- both ends of the third region are inside the first region and the second region in the direction in which the channel semiconductor film SC extends.
- the lateral gate electrode SG is provided in the contact holes CH1 and CH2.
- the lateral gate electrode SG is formed by filling the contact holes CH1 and CH2 with the metal constituting the second conductive layer when forming the second conductive layer including the upper gate electrode HG. Therefore, the lateral gate electrode SG is opposed to both sides of the channel semiconductor film SC in the width direction.
- the gate electrode exists above, below, and in the width direction of the channel semiconductor film SC, and the thin film transistor TFT2 can be driven with a lower voltage than in the case where there is no gate electrode in the width direction.
- the drive voltage By reducing the drive voltage, the occurrence of the kink phenomenon can be suppressed.
- FIG. 6 is a plan view showing another example of the thin film transistor TFT2.
- the order of the layers constituting the thin film transistor TFT2 shown in FIG. 6 is the same as that of the example of FIG. 5, and the same applies to other examples and other embodiments unless otherwise specified.
- the example of FIG. 6 differs from the example of FIG. 4 in that both ends of the contact holes CH1 and CH2 are outside the both ends of the lower gate electrode LG and the upper gate electrode in the direction in which the channel semiconductor film SC extends. On the inside of both ends.
- the lateral gate electrode SG may be formed in a region where the contact holes CH1 and CH2 and the upper gate electrode HG overlap each other in plan view, or may be formed in the entire region of the contact holes CH1 and CH2. Good.
- the lateral gate electrode SG can be made longer, whereby the drive voltage can be further reduced as compared with the example of FIG. 4 and the kink phenomenon can be suppressed.
- the lateral gate electrode SG formed in the thin film transistor TFT2 may face only one side of the channel semiconductor film SC when viewed in the width direction.
- FIG. 7 is a plan view showing another example of the thin film transistor TFT2
- FIG. 8 is a cross-sectional view of the thin film transistor TFT2 shown in FIG. 7 taken along the line VIII-VIII.
- the contact hole CH2 does not exist above the channel semiconductor film SC as seen in FIG. 7, and the lateral gate electrode SG is provided only inside the contact hole CH1. It has been. 7 and 8 can also suppress the kink phenomenon.
- the lateral gate electrode SG in the contact hole CH2 may be eliminated as in the examples shown in FIGS.
- the lateral gate electrode SG formed in the thin film transistor TFT2 may not be continuously formed in the direction in which the channel semiconductor film SC extends.
- FIG. 9 is a plan view showing another example of the thin film transistor TFT2. The cross section taken along the line VV in FIG. 9 is the same as FIG.
- the channel semiconductor film SC is composed of five parts that are aligned in the extending direction and are spaced apart from each other. Accordingly, the lateral gate electrode SG formed inside the contact hole CH1 and the contact hole CH2 is provided intermittently. Each of the contact hole CH1 and the contact hole CH2 is provided intermittently.
- the lateral gate electrode SG located on one side in the width direction of the channel semiconductor film SC is composed of a plurality of portions arranged in the direction in which the channel semiconductor film SC extends and spaced apart from each other.
- the number of this part may differ from what is shown in FIG. Only the contact hole CH1 or only the contact hole CH2 may be formed intermittently. Further, at least one of the contact holes CH1 and CH2 in other examples may be formed intermittently.
- FIG. 10 is a plan view showing another example of the thin film transistor TFT2.
- the thin film transistor shown in FIG. 10 is different from the example of FIG. 4 in that the upper gate electrode HG has a cutout so that a region facing the channel semiconductor film SC is interrupted halfway when viewed in the direction in which the channel semiconductor film SC extends.
- the region of the upper gate electrode HG that faces the channel semiconductor film SC is divided into a plurality of partial regions that are aligned in the direction in which the channel semiconductor film SC extends by notches.
- the region of the upper gate electrode HG that faces the channel semiconductor film SC is divided into two partial regions.
- Each partial region is connected to the wiring WG via the contact hole CHG by a region below the partial region of the upper gate electrode HG in FIG.
- a portion of the lateral gate electrode SG is provided on both sides of each partial region viewed in the width direction, and the number of portions of the lateral gate electrode SG is a number obtained by multiplying the number of partial regions by 2.
- both ends of the portion of the lateral gate electrode SG are inside the ends of the partial region including the region facing the portion.
- the cutout may be provided in the lower gate electrode LG, or the cutout may be combined with another example.
- FIG. 11 is a plan view showing an example of the pixel circuit PC according to the second embodiment.
- 12 is a cross-sectional view taken along the line XII-XII of the pixel circuit PC shown in FIG.
- the point that the contact holes CH1 and CH2 do not exist in FIG. 11 with respect to FIG. 2 is a major difference from the first embodiment. This is because the lateral gate electrode SG is formed without using the contact holes CH1 and CH2.
- the channel semiconductor film SC and the second capacitor electrode CE2 are connected in the same layer.
- the region where the gate insulating layers IN1, IN2 are formed is different from that of the first embodiment.
- the gate insulating layers IN1 and IN2 are left only in areas where there is a high necessity such as the vicinity of the channel semiconductor film SC and the area where the capacitor CS is formed.
- the lateral gate electrode SG is formed by forming a metal film of a second conductive layer that covers the side surface of the step at the end of the remaining region of the gate insulating layers IN1 and IN2.
- the lower gate electrode LG has a protruding region protruding from the gate insulating layers IN1 and IN2 in the width direction of the channel semiconductor film SC, and the lateral gate electrode SG is connected to the lower gate electrode LG in the protruding region.
- FIG. 13 is a plan view showing an example of the thin film transistor TFT2 according to the second embodiment.
- 14 is a cross-sectional view taken along the line XIV-XIV of the thin film transistor TFT2 shown in FIG.
- the thin film transistor TFT2 shown in FIGS. 13 and 14 is an example in the case where the capacitor CS does not exist unlike the examples of FIGS. 11 and 12, but may be combined with the capacitor CS.
- gate insulating layers IN1 and IN2 are also illustrated.
- the lower gate electrode LG has a protruding region protruding from the gate insulating layers IN1, IN2 in the width direction of the channel semiconductor film SC.
- the lower gate electrode LG is connected to the lateral gate electrode SG in the protruding region.
- a region surrounding the channel semiconductor film SC in the gate insulating layers IN1 and IN2 has an island shape.
- the outer shape of the region surrounding the channel region of the channel semiconductor film SC in the gate insulating layers IN1 and IN2 has a certain width in the width direction from the channel region, and the lateral gate is in contact with the outside of the outer shape.
- An electrode SG is formed.
- the gate insulating layers IN1 and IN2 are provided so as to avoid the side opposite to the channel semiconductor film SC as viewed from the lateral gate electrode SG, and the lateral gate electrode as viewed from the channel semiconductor film SC.
- the lower gate electrode LG and the region of the second conductive layer are in contact with each other.
- the region of the second conductive layer is connected to the horizontal gate electrode SG in the same layer.
- an organic EL display device according to a third embodiment of the present invention will be described.
- a structure for suppressing hole accumulation is provided in the channel region.
- the following description will focus on portions of the organic EL display device according to the third embodiment that are different from the first embodiment.
- FIG. 15 is a plan view showing an example of the pixel circuit PC according to the third embodiment. 15 is different from FIG. 2 in that the channel semiconductor film SC is also branched upward in FIG. 15 in the channel region, and is electrically connected to the source region via the power line PL. It is. Further, the contact hole CH1 is provided to avoid the branched channel semiconductor film SC.
- FIG. 16 is a plan view showing an example of the thin film transistor TFT2 according to the third embodiment.
- 17 is a cross-sectional view taken along the line XVII-XVII of the thin film transistor TFT2 shown in FIG.
- the thin film transistor TFT2 shown in FIG. 16 differs from that shown in FIG. 15 in the following four points.
- the first is that a portion connected to the capacitor CS is not included.
- the direction in which the channel semiconductor film SC branches and extends is opposite to the contact hole CHG.
- the lateral gate electrode SG contact hole
- the fourth point is that the branch destination is electrically connected to the drain region via the wiring WD.
- the thin film transistor TFT2 according to the third embodiment also has an effect of suppressing hole accumulation.
- the wiring WS is in contact with the source end of the channel semiconductor film SC through the contact hole CHS, and the wiring WG is in contact with the wiring WG through the contact hole CHG.
- the channel semiconductor film SC has a branch portion BR that branches in the width direction in the channel region.
- the shape of the channel semiconductor film SC is T-shaped.
- the branch portion BR is connected to the wiring WD through the contact hole CHH, and the wiring WD is connected to the drain region of the channel semiconductor film SC through the contact hole CHD.
- the branch portion BR may be connected to the source region via the wiring WS.
- the branch portion BR includes a channel region to which the signal potential of the gate electrode is applied (referred to as a branch channel region).
- the branch channel region branches from the channel region, and planarly overlaps one of the upper gate electrode HG and the lower gate electrode LG.
- the lower gate electrode LG has a gate branch portion that branches to face the branch portion BR. Thereby, the branch channel region continues to the vicinity of the contact hole CHH.
- the upper gate electrode HG is rectangular, and the outer shape of the upper gate electrode HG is surrounded by the outer shape of the lower gate electrode LG. Similar to the example of FIG.
- both ends of the channel semiconductor film SC protrude from the upper gate electrode HG and the lower gate electrode LG in the direction in which the channel semiconductor film SC extends from the source end to the drain end. Further, in plan view, the first position where the channel semiconductor film SC protrudes from the lower gate electrode LG is outside the second position where it protrudes from the upper gate electrode HG. Note that this channel branch may be combined with another example of the thin film transistor TFT2.
- FIG. 18 is a plan view showing another example of the thin film transistor TFT2.
- the upper gate electrode HG is provided so as to cover the region of the lower gate electrode LG excluding the gate branching portion.
- the upper gate electrode HG is rectangular, and the outer shape of the upper gate electrode HG surrounds the region of the lower gate electrode LG excluding the wiring to the gate branch portion and the contact hole CHG.
- the second position where the channel semiconductor film SC protrudes from the upper gate electrode HG is outside the first position where it protrudes from the lower gate electrode LG.
- the light falling on the channel region of the channel semiconductor film SC is reduced, and the characteristics of the thin film transistor TFT2 are further stabilized.
- FIG. 19 is a plan view showing another example of the thin film transistor TFT2.
- the contact hole CH2 is provided in the direction of the contact hole CHH when viewed from the channel region of the channel semiconductor film SC.
- the contact hole CH2 is provided intermittently in the two regions so as to avoid the branch part BR of the channel semiconductor film SC.
- a lateral gate electrode SG is provided in the contact holes CH1 and CH2, and the lateral gate electrode SG exists on both sides of the channel region of the channel semiconductor film SC in the width direction.
- FIG. 20 is a plan view showing another example of the thin film transistor TFT2.
- FIG. 21 is a cross-sectional view taken along the line XXI-XXI of the thin film transistor TFT2 shown in FIG. 20 and 21, a hot carrier removal wiring is connected under the channel region instead of the branch portion BR of the channel semiconductor film SC.
- the lower gate electrode LG has a notch.
- the notch of the lower gate electrode LG is provided from the contact hole CHH side toward the center position of the channel region.
- the upper gate electrode has a rectangular shape with a cutout from one side in the width direction.
- the region of the lower gate electrode LG that faces the channel semiconductor film SC is divided into a plurality of partial regions that are aligned in the direction in which the channel semiconductor film SC extends by notches. For each of the partial regions, contact holes CH1 and CH2 are provided so as to sandwich the partial region when viewed in the width direction.
- a wiring WC that is separated from the lower gate electrode LG and is in the same layer as the lower gate electrode LG is provided, and the wiring WC is connected to the wiring WD.
- the contact hole CHH extends below the center of the channel region of the channel semiconductor film SC.
- the wiring WC is in contact with the lower surface of the channel semiconductor film SC through a contact hole CHC provided below the center of the channel region, and the wiring WC and the channel semiconductor film SC are electrically connected. Note that the wiring WC may be electrically connected to the wiring WS.
- the notch may be provided in the upper gate electrode HG.
- the cutout of the upper gate electrode HG is provided from the contact hole CHH side toward the center position of the channel region.
- the upper gate electrode HG corresponds to the planar shape of the lower gate electrode LG in FIG.
- the shape of the upper gate electrode HG is a shape in which a cutout is provided in a rectangle from one side in the width direction, and a region from one side in the width direction to the wiring WG is provided.
- a wiring WC in the same layer as the upper gate electrode HG is provided, and the wiring WC extends from the contact hole CHH connected to the wiring WD to the center of the channel region of the channel semiconductor film SC. It extends to the top.
- the wiring WC is in contact with the upper surface of the channel semiconductor film SC through a contact hole CHC provided on the center of the channel region, and the wiring WC and the channel semiconductor film SC are electrically connected.
- the gate insulating layer may be formed by growing an oxide film on the surface and side surfaces of the channel semiconductor film SC with a laser or the like.
- the thickness of the side surface of the channel semiconductor film SC can be controlled with high accuracy, and the manufacturing margin can be increased as compared with the formation of the contact hole.
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Abstract
Description
本発明の第1の実施形態にかかる有機EL表示装置は、アレイ基板SUB(図3参照)と、アレイ基板SUBに対向する対向基板と、アレイ基板SUBに接続されるフレキシブル回路基板と、ドライバ集積回路とを含む。対向基板にカラーフィルタが設けられ、カラーフィルタと白色OLED(Organic Light Emitting Diode)との組合せによりフルカラー表示が実現される。白色OLEDの代わりにRGB等のそれぞれの色を発光する発光素子を用いる場合には、対向基板およびカラーフィルタは存在しなくてもよい。
次に本発明の第2の実施形態にかかる有機EL表示装置について説明する。以下では第2の実施形態にかかる有機EL表示装置のうち、第1の実施形態と異なる部分を中心に説明する。
次に本発明の第3の実施形態にかかる有機EL表示装置について説明する。本実施形態ではチャネル領域にホールアキュムレーション抑制のための構造が設けられている。以下では第3の実施形態にかかる有機EL表示装置のうち、第1の実施形態と異なる部分を中心に説明する。
Claims (19)
- マトリクス状に配置された複数の画素の各々に設けられた薄膜トランジスタを有し、
前記薄膜トランジスタは、半導体層と、前記半導体層の下層に設けられた第1絶縁層と、前記半導体層の上層に設けられた第2絶縁層と、前記半導体層に間隔をあけて対向するゲート電極と、を有し、
前記半導体層は、ソース領域と、ドレイン領域と、前記ソース領域と前記ドレイン領域の間にあるチャネル領域とを含み、且つ上面と、下面と、前記上面と前記下面とに接続すると共に前記チャネル領域に含まれる部分を有する側面とを備え、
前記ゲート電極は、前記第1絶縁層を介して前記半導体層の前記下面に対向する第1ゲート電極部と、前記第2絶縁層を介して前記半導体層の前記上面に対向する第2ゲート電極部と、前記半導体層の前記側面に対向すると共に、前記第1ゲート電極部及び前記第2ゲート電極部に接する第3ゲート電極部と、を含み、
前記半導体層の周囲に、前記第1絶縁層と前記第2絶縁層とが互いに積層する積層部を備え、
前記積層部の一部が、前記半導体層の前記側面と前記第3ゲート電極部との間に位置する、
ことを特徴とする表示装置。 - 前記半導体層は、
平面的に見て、前記第1ゲート電極と前記第2ゲート電極部の一方のみと重畳する第1の部分と、
平面的に見て、前記第1の部分から前記半導体層とは反対の側に突出し、前記第1ゲート電極と前記第2ゲート電極部のどちらとも重畳しない第2の部分、とを備えている、
ことを特徴とする請求項1に記載の表示装置。 - 前記半導体層の前記チャネル領域は、
平面的に見て、前記第1ゲート電極部と前記第2ゲート電極部の両方と重畳する一対の第1の重畳領域と、
平面的に見て、前記第1ゲート電極部と前記第2ゲート電極部の一方のみと重畳する一対の第2の重畳領域と、を含み、
前記一対の第1の重畳領域は、互いに前記ソース領域と前記ドレイン領域とを結ぶ方向に互いに対向して位置し、
前記一対の第2の重畳領域の各々は、前記一対の第1の重畳領域の各々に隣接して位置する、
ことを特徴とする請求項1に記載の表示装置。 - 前記第1ゲート電極部と前記第2ゲート電極部の一方は、前記ソース領域と前記ドレイン領域とを結ぶ方向に交差する方向へ窪む切り欠きを有し、
前記切り欠きの内側に位置し、且つ平面的に見て前記一方と重畳していない非重畳領域には、前前記半導体層の一部が位置している
ことを特徴とする請求項1に記載の表示装置。 - 前記非重畳領域には、配線が位置し、
前記配線は、前記上面又は前記下面の前記一方と対向する面で、前記半導体層に電気的に接続する、
ことを特徴とする請求項4に記載の表示装置。 - 前記配線は、前記ソース領域と前記ドレイン領域の一方に電気的に接続する、
ことを特徴とする請求項5に記載の表示装置。 - 前記積層部は、前記半導体層の前記側面と対向する位置にコンタクトホールを有し、
前記第3ゲート電極部は、コンタクトホール内に設けられる、
ことを特徴とする請求項1に記載の表示装置。 - 前記第1ゲート電極部は、前記半導体層と対向する第1領域を有し、
前記第2ゲート電極部は、前記半導体層と対向する第2領域を有し、
前記コンタクトホールは、前記ソース領域と前記ドレイン領域とを結ぶ方向に位置する一対の端部を有し、
前記コンタクトホールの前記一対の端部は、平面的に見て、前記第1領域と前記第2領域の一方と重畳し、他方とは重畳しない、
ことを特徴とする請求項7に記載の表示装置。 - 前記第1ゲート電極部は、平面的に見て、前記第1絶縁層と前記第2絶縁層とから突出する突出領域を有し、
前記第3ゲート電極部は、前記突出領域で前記第1ゲート電極部に接続する、
ことを特徴とする請求項1に記載の表示装置。 - 前記第1絶縁層及び前記第2絶縁層は、前記第3ゲート電極部の前記半導体層とは反対側の面と接していない
ことを特徴とする請求項1に記載の表示装置。 - 前記3ゲート電極部は、前記ソース領域と前記ドレイン領域とを結ぶ方向に位置する一対の端部を有し、
前記3ゲート電極部の前記一対の端部は、平面的に見て、前記第1ゲート電極部と前記第2ゲート電極部とに重畳する、
ことを特徴とする請求項1に記載の表示装置。 - 前記第1ゲート電極部は、前記半導体層と対向する第1領域を有し、
前記第2ゲート電極部は、前記半導体層と対向する第2領域を有し、
前記第3ゲート電極部は、前記半導体層と対向する第3領域を有し、
前記第3領域は、前記ソース領域と前記ドレイン領域とを結ぶ方向の両側に位置する一対の端部を有し、
前記第3領域の前記一対の端部は、平面的に見て、前記第1領域と前記第2領域とに重畳する、
ことを特徴とする請求項11に記載の表示装置。 - 前記半導体層の前記側面は、第1の側面と、前記第1の側面と前記チャネル領域を介して対向する第2の側面と、を含み、
前記第3ゲート電極部は、前記第1の側面と前記第2の側面の両方と対向する、
ことを特徴とする請求項1に記載の表示装置。 - 前記半導体層の前記側面は、第1の側面と、前記第1の側面と前記チャネル領域を介して対向する第2の側面と、を含み、
前記第3ゲート電極部は、前記第1の側面と前記第2の側面の一方みに対向する、
ことを特徴とする請求項1に記載の表示装置。 - 前記半導体層の前記側面は、第1の側面と、前記第1の側面と前記チャネル領域を介して対向する第2の側面と、を含み、
前記第3ゲート電極部は、前記第1の側面と対向する互いに離間した複数の第1離間部分を含む、
ことを特徴とする請求項1に記載の表示装置。 - 前記第3ゲート電極部は、前記第2の側面と対向する互いに離間した複数の第2離間部分を含む、
ことを特徴とする請求項15に記載の表示装置。 - 前記半導体層は、前記ソース領域と前記ドレイン領域とを結ぶ方向に交差する方向に分岐する分岐部を有し、
前記分岐部は、前記チャネル領域から分岐している、
ことを特徴とする請求項1に記載の表示装置。 - 前記第1ゲート電極部及び前記第2ゲート電極部の少なくとも一方は、前記分岐部に対向する分岐ゲート電極部を有する、
ことを特徴とする請求項17に記載の表示装置。 - 前記分岐部は、前記ソース領域と前記ドレイン領域の一方と電気的に接続する、
ことを特徴とする請求項17に記載に表示装置。
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