CN204288767U - A kind of dot structure and array base palte - Google Patents
A kind of dot structure and array base palte Download PDFInfo
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- CN204288767U CN204288767U CN201420838816.7U CN201420838816U CN204288767U CN 204288767 U CN204288767 U CN 204288767U CN 201420838816 U CN201420838816 U CN 201420838816U CN 204288767 U CN204288767 U CN 204288767U
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Abstract
The utility model discloses a kind of dot structure and array base palte, QLED display device low with the QLED display device serviceable life solving existing quanta point electroluminescent QLED display device prepares the large problem of difficulty.Described dot structure, comprising: thin film transistor (TFT) TFT, for controlling micro-electromechanical system (MEMS) switch; Described micro-electromechanical system (MEMS) switch, for controlling the transit dose of the emergent light of light emitting diode with quantum dots QLED device; Described light emitting diode with quantum dots QLED device is top emission type, for carrying out constant light emitting according to constant light emitting drive singal.
Description
Technical field
The utility model relates to display technique field, particularly relates to a kind of dot structure and array base palte.
Background technology
Quantum dot (Quantum Dot, QD) can be described as again nanocrystalline, it is a kind of nano particle be made up of II-VI group or iii-v element, because electronics and hole are by quantum confinement, continuous print band structure becomes the discrete energy levels structure with molecular characterization, can emitting fluorescence after being excited, and its luminescent spectrum can be controlled by the size changing quantum dot, fluorescence intensity and stability are all fine, are a kind of well electroluminescent materials.The kind of quantum dot is a lot, and representational have CdS, CdSe, CdTe, ZnO, ZnS, ZnSe, ZnTe etc. of II-VI group and iii-v GaAs, GaP, GaAs, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, AlSb etc.
At present, quantum dot is as a kind of display material and be widely used in display field, such as, the light emitting diode indicator (Quantum Dot LightEmitting Display, QLED) utilizing quantum dot to produce as luminescent material.The structure that existing QLED display adopts and display of organic electroluminescence (Organic Light Emitting Display, OLED) similar, by the negative electrode of TFT by QLED display device in on-off action control QLED display, luminous or not luminous with control QLED display device, i.e. control QLED display device flicker.But, the QLED displaying appliance of prior art has following problem: existing QLED display is the frequent flicker of the continuous change control QLED display device by drive current, therefore the imbalance of charge injection can be caused (namely, injected electrons and number of cavities imbalance), repeat this process for a long time quantum dot chemistry can be caused to dissociate (such as oxidation/reduction) thus sex change occurs, make QLED display device service life reduction; And, the mode of the flicker of the change control QLED display device of drive current is realized by the negative electrode of QLED display device in on-off action control QLED display by TFT, there is the problem of Current Control instability, need complicated compensating circuit to compensate electric current, therefore to prepare difficulty large for the QLED display device of prior art.
Utility model content
The purpose of this utility model is to provide a kind of dot structure and array base palte, to solve the low and problem that preparation technology's difficulty is large of existing QLED display device life-span.
The utility model embodiment provides a kind of dot structure, comprising:
Thin film transistor (TFT) TFT, for controlling micro-electromechanical system (MEMS) switch;
Described micro-electromechanical system (MEMS) switch, for controlling the transit dose of the emergent light of light emitting diode with quantum dots QLED device;
Described light emitting diode with quantum dots QLED device is top emission type, for carrying out constant light emitting according to constant light emitting drive singal.
In the utility model embodiment, increase described mems switch in dot structure, described TFT controls the duty of mems switch, to control the transit dose of the emergent light of described QLED device.
Alternatively, drain electrode and the described mems switch of described TFT are electrically connected, and the signal received according to the source electrode of self after described TFT conducting controls described mems switch.In the present embodiment, the duty of described mems switch carries out converting or adjusting according to the ON/OFF state of described TFT and the signal received, thus controls the transit dose of the emergent light of described QLED device.
Optionally, described mems switch comprises connecting portion and switch portion, and the drain electrode of described connecting portion and described TFT is electrically connected, and described switch portion is arranged at the light direction side of described QLED device to control the light quantity of the emergent light of described QLED device.In the present embodiment, the switch portion of described mems switch is arranged on the light direction of described QLED device, can according to the light quantity of the amplitude control of self folding through the emergent light of QLED device.
Optionally, described dot structure also comprises shading strip, and described shading strip is positioned at the below of the edge of the close described QLED device side of described mems switch.In the utility model embodiment, described shading strip can block the light leak of described mems switch, avoids display abnormal.
Optionally, described dot structure also comprises the first conductive structure, and described mems switch is electrically connected by the drain electrode of described first conductive structure and described TFT.
Optionally, be provided with insulation course between the drain electrode of described TFT and the connecting portion of described mems switch, described first conductive structure is electrically connected by the drain electrode of the first via hole on described insulation course and described TFT.In the utility model embodiment, described first via hole that described insulation course is formed, enables described first conductive structure and described drain electrode realize being electrically connected.
Optionally, described shading strip and described first conductive structure are arranged with layer and insulated from each other, and the material of described first conductive structure and described shading strip is metal material.In the utility model embodiment, described shading strip and described first conductive structure are arranged with layer, can save operation in the preparation.
The utility model embodiment beneficial effect is as follows: when display device works, described TFT controls the duty of mems switch, to control the transit dose of the emergent light of described QLED device, avoid the frequent flicker of QLED device, improve the serviceable life of described QLED device.
The utility model embodiment provides a kind of array base palte, comprises multiple pixel cells of array arrangement, the described dot structure that pixel cell described in each adopts as above embodiment to provide.
The utility model embodiment beneficial effect is as follows: when display device works, make described QLED device constant light emitting, described TFT controls the duty of mems switch, to control the transit dose of the emergent light of described QLED device, avoid the frequent flicker of QLED device, improve the serviceable life of described QLED device.
Accompanying drawing explanation
The cross-sectional view of the first dot structure that Fig. 1 provides for the utility model embodiment;
The cross-sectional view of the second dot structure that Fig. 2 provides for the utility model embodiment;
The cross-sectional view of the third dot structure that Fig. 3 provides for the utility model embodiment;
The cross-sectional view of the 4th kind of dot structure that Fig. 4 provides for the utility model embodiment;
The cross-sectional view of the 5th kind of dot structure that Fig. 5 provides for the utility model embodiment;
The cross-sectional view of the 6th kind of dot structure that Fig. 6 provides for the utility model embodiment;
The schematic diagram of the shading strip that Fig. 7 provides for the utility model embodiment and color blocking;
The process flow diagram of the preparation method of a kind of dot structure that Fig. 8 provides for the utility model embodiment;
The process flow diagram of the pixel displaying method that Fig. 9 the utility model embodiment provides.
Reference numeral:
Underlay substrate 1; Gate electrode 2; Gate insulation layer 3; Active layer 4; Source electrode 5; Drain electrode 6; Insulation course 7; Passivation layer 71; First conductive structure 8; Mems switch 9; Anode 10; Hole injection layer 11; Hole transmission layer 12; QLED luminescent layer 13; Electron transfer layer 14; Electron injecting layer 15; Negative electrode 16; First via hole 17; Shading strip 18; First electrode 19; Second electrode 20.
Embodiment
Be described in detail below in conjunction with the implementation procedure of Figure of description to the utility model embodiment.It should be noted that same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
The frequent flicker of QLED device in dot structure, improve the serviceable life of QLED device, the utility model embodiment provides a kind of dot structure, comprising: thin film transistor (TFT) TFT, for controlling micro-electromechanical system (MEMS) switch; Micro-electromechanical system (MEMS) switch, for controlling the transit dose of the emergent light of light emitting diode with quantum dots QLED device; Light emitting diode with quantum dots QLED device is top emission type, for carrying out constant light emitting according to constant light emitting drive singal.It should be noted that, " constant light emitting " in the utility model embodiment is not limited to be absolute constant light emitting, do not refer to that its QLED device is on state of always and does not close yet, here " constant " refers to for the flashing pattern of QLED device, when driving pixel to carry out luminescence, the intensity of drive singal is relative constancy, not must pass through the strong of drive singal and the weak different GTG displays realizing pixel.Be adapted to the QLED device of " constant light emitting ", the mems switch of the transit dose of the emergent light that can control quantum dot QLED device is provided, this mems switch can according to the control of TFT through the bright dipping of QLED device, or through the part bright dipping of QLED device, or through whole bright dippings of QLED device, make QLED device under the state of " constant light emitting ", dot structure can provide and carry out different GTG from QLED device flashing and show identical function, in the present embodiment, mems switch can be adjustable grating or light valve, the gap width that grating or light valve can be controlled to open by TFT is to control amount of light.TFT can be bottom gate type, top gate type or other structures, and TFT at least comprises one of source electrode and drain electrode and is electrically connected with mems switch, thus TFT drives the open mode of mems switch or amplitude of opening to regulate light transmission capacity according to the power of drive singal.
Alternatively, the drain electrode of TFT and mems switch are electrically connected, and the signal received according to the source electrode of self after TFT conducting controls mems switch.In the present embodiment, the drain electrode of mems switch and TFT is electrically connected, thus realize the control of the mems switch of TFT, certainly, for dissimilar TFT, also can be electrically connected by the source electrode of TFT and mems switch, because TFT usually can two-way admittance, therefore be electrically connected by the source electrode of TFT or drain electrode and mems switch and do not affect enforcement of the present utility model, do not repeat them here.
Optionally, mems switch comprises connecting portion and switch portion, and the drain electrode of connecting portion and TFT is electrically connected, and switch portion is arranged at the light direction side of QLED device with the light quantity of the emergent light of control QLED device.In the present embodiment, the switch portion of mems switch is arranged on the light direction of QLED device, can according to the light quantity of the amplitude control of self folding through the emergent light of QLED device.
Optionally, dot structure also comprises shading strip, and shading strip is positioned at the below of the edge of the close QLED device side of mems switch.In the utility model embodiment, shading strip can block the light leak of mems switch, avoids display abnormal.
Optionally, dot structure also comprises the first conductive structure, and mems switch is electrically connected by the drain electrode of the first conductive structure and TFT.
Optionally, be provided with insulation course between the drain electrode of TFT and the connecting portion of mems switch, the first conductive structure is electrically connected by the drain electrode of the first via hole on insulation course and TFT.In the utility model embodiment, the first via hole that insulation course is formed, enables the first conductive structure and drain electrode realize being electrically connected, it should be noted that, for the TFT of different structure, this insulation course can be a kind of in passivation layer, gate insulator or planarization layer or combination.
Optionally, shading strip and the first conductive structure are arranged with layer and insulated from each other, and the material of the first conductive structure and shading strip is metal material.In the utility model embodiment, shading strip and the first conductive structure are arranged with layer, can save operation in the preparation.
In the utility model embodiment, the QLED device in dot structure with " constant light emitting ", the mems switch controlled by TFT, TFT can control the duty of mems switch according to the power of drive singal, make mems switch through the emergent light of satisfactory QLED device.The transit dose of the emergent light of control QLED device.
In order to clearer, the dot structure that the utility model embodiment provides is described, is described with the dot structure shown in Fig. 1, as follows:
Implement one
See Fig. 1, this dot structure, comprise thin film transistor (TFT) TFT, with TFT isolated light emitting diode with quantum dots QLED device, thin film transistor (TFT) comprises the gate electrode 2 be formed at successively on underlay substrate 1, gate insulation layer 3, active layer 4, source electrode 5, drain electrode 6 and insulation course 7, insulation course 7 is formed with the corresponding at least partly of the drain electrode 6 of the first via hole 17, first via hole 17 and TFT.In the utility model embodiment, this TFT is bottom-gate type configuration, and this insulation course 7 is passivation layer, or is the combination of passivation layer and planarization layer.
Described dot structure also comprises the first conductive structure 8, first conductive structure 8 be formed on insulation course 7 and is electrically connected with drain electrode 6, and the first conductive structure 8 is electrically connected with the drain electrode 6 of TFT by the first via hole 17.
Mems switch 9 is formed on the first conductive structure 8, and mems switch 9 and the first conductive structure 8 are electrically connected; Mems switch 9 adjusts the amplitude of folding, with the transit dose of the emergent light of control QLED device according to the control of TFT break-make.Such as, during TFT conducting, mems switch 9 opens certain amplitude, the mems switch 9 that the light transmission of QLED device is opened shows, the parameter of the signal such as viewdata signal that the degree that mems switch 9 is opened can be received by TFT determines, the display brightness that such as this viewdata signal is corresponding is high, then the amplitude opened of mems switch 9 is large, if the display brightness that this viewdata signal is corresponding is low, then the amplitude opened of mems switch 9 is little; When TFT turns off, mems switch 9 closes, and the light of QLED device cannot be shown through mems switch 9; Certainly, also can, based on border value, namely only make mems switch 9 only have two states, i.e. open and close two states, to should two states, make QLED device have light transmission capacity and light tight two states.It should be noted that, the first conductive structure 8 can be metal material or ITO preparation, adopts metal to make, to reach the effect with satisfactory electrical conductivity and signal transfer characteristic in optional embodiment.In the utility model embodiment, be provided with the folding of mems switch 9, TFT switch control rule mems switch 9 in dot structure, with the display of control QLED device.
Optionally, mems switch 9 comprises connecting portion 91 and switch portion 92; Connecting portion 91 covers the first conductive structure 8 of the first via hole 17 position, and switch portion 92 is placed in the light direction side of QLED device.In the utility model embodiment, because mems switch 9 can change the folding amplitude of folding condition, therefore after mems switch 9 blocks QLED device, whether luminously through QLED device can control according to self folding condition, and control the transit dose through the emergent light of QLED device according to folding amplitude, thus realize display; In an alternate embodiment of the invention, the connecting portion 91 of mems switch 9 covers the first conductive structure 8 of the first via hole 17 position, namely, the area of connecting portion 91 is greater than the area of the first conductive structure 8, like this in follow-up manufacture craft process, corrosion that the first conductive structure 8 is caused and damage can be avoided.
Optionally, QLED device comprises according to the anode 10 be formed on underlay substrate 1, hole injection layer 11, hole transmission layer 12, QLED luminescent layer 13, electron transfer layer 14, electron injecting layer 15 and negative electrode 16.It should be noted that, in the present embodiment, this QLED device is top emission type, and the negative electrode 16 of QELD device is transparent material, light by QLED device negative electrode 16 through and arrive the switch portion 92 of mems switch 9.In other embodiment, this QLED device can also be inverted bottom emitting type QLED device, to adapt to different user demands.
It should be noted that, the concrete structure of the switch portion 92 of mems switch 9 can be grating valve, or grid etc. other do not limit the adjustable type translucent construction of shape; In an alternate embodiment of the invention, the orientation of the grid of described grating valve is set to multiple, comprise and angle that the direction from source electrode to drain electrode of TFT is formed be in 0 to 90 spend between (with reference to accompanying drawing be, as situation in Fig. 1 is roughly 0 degree, in Fig. 2, situation is roughly 90 degree), the diagrammatic cross-section breaker in middle portion 92 of dot structure as shown in Figure 2.
In an alternate embodiment of the invention, in order to avoid producing edge's light leak when mems switch 9 pairs of QLED devices block, shading strip can also be increased on the basis of the dot structure shown in Fig. 1.Dot structure as shown in Figure 3, be with the dot structure difference shown in Fig. 1: the edge on the negative electrode 16 of QLED device arranges shading strip 18, the material of shading strip 18 can for having any material of interception, such as metal, black matrix material, or other the resin material etc. that with the addition of shading material; In an alternate embodiment of the invention, this shading strip 18 and the first conductive structure 8 are arranged with layer and insulated from each other with the first conductive structure 8, particularly, shading strip 18 and the first conductive structure 8 use same material being formed with in a patterning processes, can the patterning processes such as single exposure be saved like this, reduce costs, optimize manufacturing process.Fig. 7 illustrates the schematic diagram of shading strip 18 and color blocking, color blocking comprises such as R, G, B color blocking, or the array mode of other colors such as R, G, B, W, certain R, G, B color blocking is not limited to the arrangement mode shown in Fig. 7, can carry out arrangement and the layout of various mode as required; In an alternate embodiment of the invention, shading strip 18 is connected in a row or column pixel, for blocking the edge light leak of mems switch 9; In a further preferred embodiment, shading strip 18 is not limited to only carry out shading to an edge of pixel, such as, when primitive shape is roughly rectangle, shading is carried out in any position that shading strip 18 can be arranged on this pixel edge, preferably, shading strip 18 is at least arranged on the edge of the side relative to TFT of pixel, and shaded effect is better.In a further advantageous embodiment, this shading strip 18 is also electrically connected with cathode signal providing source, for negative electrode provides electric signal, thus improves the illumination effect of QLED device.
The utility model embodiment beneficial effect is as follows: in dot structure, increase mems switch, mems switch and the first conductive structure are electrically connected, first conductive structure is electrically connected by the drain electrode of the first via hole and TFT, thus the drain electrode of mems switch and TFT is electrically connected; When display device works, make QLED device constant light emitting, TFT is by the folding amplitude of control MEMS, and the amount of light of the emergent light of control QLED device, to avoid the frequent flicker of QLED device, improves the serviceable life of QLED device; By the display of the folding control QLED display device of mems switch, therefore do not need current compensation to regulate the brightness of QLED display device, more complicated current compensation circuit can be saved, reduce the preparation difficulty of QLED device.
Embodiment two
See Fig. 4, another kind of dot structure is provided, this dot structure comprise thin film transistor (TFT) TFT, with TFT isolated light emitting diode with quantum dots QLED device, thin film transistor (TFT) comprises the ohmic contact layer be formed at successively on underlay substrate 1, active layer 4, gate insulation layer 3, gate electrode 2, passivation layer 71 and source-drain electrode metal level; Ohmic contact layer comprises the first electrode 19 and the second electrode 20, and source-drain electrode metal level comprises source electrode 5 and drain electrode 6.This TFT is top-gate type structure, compared with the present embodiment of above-mentioned bottom gate type TFT, not simple by bottom gate type to the simple transformation of top gate type and alternative, the TFT of top-gate type structure is used in this optional embodiment, can make when making mems switch, connecting portion 91 directly to be contacted with drain electrode 6, simplify manufacture craft, avoid making step, reduce cost.
Dot structure also comprises the mems switch 9 be electrically connected with drain electrode 6, mems switch 9 comprises connecting portion 91 and switch portion 92, connecting portion 91 is electrically connected with the drain electrode 6 of TFT switch, switch portion 92 blocks QLED device, it should be noted that, in the utility model embodiment, eliminate the insulation course on TFT, the connecting portion 91 of mems switch 9 directly contacts with the drain electrode 6 of TFT switch and realizes being electrically connected.Mems switch 9 adjusts the amplitude of folding, with the transit dose of the emergent light of control QLED device according to the control of TFT break-make.Such as, during TFT conducting, mems switch 9 opens certain amplitude, the mems switch 9 that the light transmission of QLED device is opened shows, the amplitude that mems switch is 9 dozens is determined by the parameter of viewdata signal, and the display brightness that such as this viewdata signal is corresponding is high, then the amplitude of mems switch 9 dozens is large, if the display brightness that this viewdata signal is corresponding is low, then the amplitude of mems switch 9 dozens is little; When TFT turns off, mems switch 9 closes, and the light of QLED device cannot be shown through mems switch 9; Certainly, also can, based on border value, namely only make mems switch 9 only have two states, the maximum and closed two states of the amplitude of namely beating, to should two states, make the light transmission capacity of the emergent light of QLED device maximum and light tight.
Optionally, QLED device comprises according to the anode 10 be formed on underlay substrate 1, hole injection layer 11, hole transmission layer 12, QLED luminescent layer 13, electron transfer layer 14, electron injecting layer 15 and negative electrode 16.It should be noted that, this QLED device is top emission type, and the negative electrode 16 of QELD device is transparent material, light by QLED device negative electrode 16 through and arrive the switch portion 92 of mems switch 9.
It should be noted that, the concrete structure of the switch portion 92 of mems switch 9 can be grating valve, or grid etc. other do not limit the adjustable type translucent construction of shape; In an alternate embodiment of the invention, the orientation of the grid of described grating valve is set to multiple, comprise and angle that the direction from source electrode to drain electrode of TFT is formed be in 0 to 90 spend between, the diagrammatic cross-section breaker in middle portion 92 of dot structure as shown in Figure 5.
In an alternate embodiment of the invention, in order to avoid producing edge's light leak when mems switch 9 pairs of QLED devices block, shading strip can also be increased on the basis of the dot structure shown in Fig. 1.Dot structure as shown in Figure 6, be with the dot structure difference shown in Fig. 4: the edge on the negative electrode 16 of QLED device arranges shading strip 18, this shading strip 18 is positioned at the below of the switch portion 92 of mems switch 9, the material of shading strip 18 can for having any material of interception, such as metal, black matrix material, or other the resin material etc. that with the addition of shading material.Fig. 7 illustrates the schematic diagram of shading strip 18 and color blocking, color blocking comprises such as R, G, B color blocking, or the array mode of other colors such as R, G, B, W, certain R, G, B color blocking is not limited to the arrangement mode shown in Fig. 7, can carry out arrangement and the layout of various mode as required, the color blocking corresponding to R, G, B, W sub-pixel such as belonging to same pixel is arranged with 2 × 2 matrix forms; In an alternate embodiment of the invention, shading strip 18 is connected in a row or column pixel, for blocking the edge light leak of mems switch 9; In a further preferred embodiment, shading strip 18 is not limited to only carry out shading to an edge of pixel, such as, when primitive shape is roughly rectangle, shading is carried out in any position that shading strip 18 can be arranged on this pixel edge, preferably, shading strip 18 is at least arranged on the edge of the side relative to TFT of pixel, and shaded effect is better.In a further advantageous embodiment, this shading strip 18 is also electrically connected with cathode signal providing source, for negative electrode provides electric signal, thus improves the illumination effect of QLED device.
The utility model embodiment beneficial effect is as follows: in dot structure, increase mems switch, and the drain electrode of mems switch and TFT is electrically connected; When display device works, make QLED device constant light emitting, TFT is by the folding amplitude of control MEMS, and the amount of light of the emergent light of control QLED device, to avoid the frequent flicker of QLED device, improves the serviceable life of QLED device; By the display of the folding control QLED display device of mems switch, therefore do not need current compensation to regulate the brightness of QLED display device, more complicated current compensation circuit can be saved, reduce the preparation difficulty of QLED device.
Embodiment three
The utility model embodiment provides a kind of array base palte, comprises multiple pixel cells of array arrangement, the dot structure that each pixel cell adopts as above embodiment to provide.
Optionally, for simplifying manufacturing process, saving the consideration of operation, the QLED of each row pixel can be made to be an entirety, namely to press the corresponding arrangement mode of R, G, B color blocking shown in Fig. 7.
The utility model embodiment beneficial effect is as follows: in dot structure, increase mems switch, and the drain electrode of mems switch and TFT is electrically connected; When display device works, make QLED device constant light emitting, TFT is by the folding amplitude of control MEMS, and the amount of light of the emergent light of control QLED device, to avoid the frequent flicker of QLED device, improves the serviceable life of QLED device; By the display of the folding control QLED display device of mems switch, therefore do not need current compensation to regulate the brightness of QLED display device, more complicated current compensation circuit can be saved, reduce the preparation difficulty of QLED device.
Embodiment four
See Fig. 8, the utility model embodiment provides a kind of preparation method of dot structure, comprising:
Step 801, underlay substrate is formed the light emitting diode with quantum dots QLED device of thin film transistor (TFT) TFT and the top emission type adjacent with TFT.
This TFT can be bottom gate type, top gate type or other structures.Such as, provide the first TFT structure, this TFT is bottom gate type, comprises the gate metal layer be formed at successively on underlay substrate, gate insulator, active layer, source-drain electrode metal level; Again such as, provide the second TFT structure, this TFT is top gate type, comprises the source-drain electrode metal level, active layer, gate insulator and the gate metal layer that are formed at successively on underlay substrate; Again such as, this the third TFT structure, TFT is top gate type, comprise the ohmic contact layer be formed at successively on underlay substrate, active layer, gate insulator, gate metal layer, passivation layer and source-drain electrode metal level, the medium of this kind of structure owing to contacting with active layer using ohmic contact layer as source-drain electrode metal level, can effectively improve TFT performance and reduce the stray capacitance between source-drain electrode metal level and gate metal layer.This QLED device can comprise the anode be formed at successively on underlay substrate, hole injection layer, hole transmission layer, QLED luminescent layer, electron injecting layer, electron transfer layer and negative electrode.Different according to the structure of TFT, concrete preparation method is slightly different,
After underlay substrate forms TFT, generally include:
Step 802, forms the insulation course comprising the first via hole on TFT, and is formed and the isolated first area of TFT on underlay substrate; Wherein, the position of the first via hole is corresponding with the position of the drain electrode of TFT.For the first TFT structure and the second TFT structure, this insulation course can be generally one of passivation layer, planarization layer or combination.For in the third TFT structure, this insulation course can generally planarization layer, it should be noted that, for the third TFT structure, because the source-drain electrode metal level of TFT is in the top, the source electrode of TFT is connected with ohmic contact layer by via hole with drain electrode, therefore, the mems switch of follow-up preparation drain electrode that is direct and TFT can be made to be electrically connected, thus to omit insulation course.
When considering better electric conductivity or reduce preparation difficulty, optionally, for the preparation of the dot structure of the first TFT of employing, the first conductive structure be electrically connected with the drain electrode of TFT can be formed on insulation course, the connecting portion of mems switch is electrically connected by the drain electrode of the first conductive structure and TFT, when the connecting portion of follow-up mems switch can be made to prepare, does not need to consider deeply to the layer at the drain electrode place of TFT, reduce preparation difficulty, also there is better electric conductivity.
Due to the mems switch of follow-up preparation and nisi sealing, therefore may there is light leakage phenomena in the side of mems switch, such as with TFT away from the side of mems switch.Therefore optional, be also included in above QLED and form shading strip, shading strip is positioned at the below of the edge of the close QLED device side of mems switch.
Step 803, the underlay substrate completing above-mentioned steps is formed the micro-electromechanical system (MEMS) switch comprising connecting portion and switch portion, the connecting portion of mems switch and the drain electrode of TFT is electrically connected, makes the switch portion of MEMS be formed at the top of QLED.
The utility model embodiment beneficial effect is as follows: in dot structure, increase mems switch, mems switch and the first conductive structure are electrically connected, first conductive structure is electrically connected by the drain electrode of the first via hole and TFT, thus the drain electrode of mems switch and TFT is electrically connected; When display device works, make QLED device constant light emitting, TFT is by the folding amplitude of control MEMS, and the amount of light of the emergent light of control QLED device, to avoid the frequent flicker of QLED device, improves the serviceable life of QLED device; By the display of the folding control QLED display device of mems switch, therefore do not need current compensation to regulate the brightness of QLED display device, more complicated current compensation circuit can be saved, reduce the preparation difficulty of QLED device.
Embodiment five
See Fig. 9, a kind of pixel displaying method of the utility model embodiment, comprising:
Step 901, light emitting diode with quantum dots QLED device carries out constant light emitting according to the driving of constant light emitting drive singal.
Step 902, thin film transistor (TFT) TFT controls the duty of micro-electromechanical system (MEMS) switch, makes the transit dose of the emergent light of mems switch control QLED device, to realize pixel display.
Optionally, in step 902, TFT controls the duty of mems switch, makes the transit dose of the emergent light of mems switch control QLED device, comprising:
The viewdata signal source electrode of TFT received is sent to the connecting portion of mems switch successively through the drain electrode of TFT, the first conductive structure, the folding amplitude switch portion of mems switch being opened match with viewdata signal, with the light quantity of the emergent light of control QLED device.
The utility model embodiment beneficial effect is as follows: in dot structure, have mems switch, and the drain electrode of mems switch and TFT is electrically connected; When display device works, make QLED device constant light emitting, TFT controls the duty of mems switch, with the transit dose of the emergent light of control QLED device, to avoid the frequent flicker of QLED device, improves the serviceable life of QLED device.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (8)
1. a dot structure, is characterized in that, comprising:
Thin film transistor (TFT) TFT, for controlling micro-electromechanical system (MEMS) switch;
Described micro-electromechanical system (MEMS) switch, for controlling the transit dose of the emergent light of light emitting diode with quantum dots QLED device;
Described light emitting diode with quantum dots QLED device is top emission type, for carrying out constant light emitting according to constant light emitting drive singal.
2. dot structure as claimed in claim 1, it is characterized in that, drain electrode and the described mems switch of described TFT are electrically connected, and the signal received according to the source electrode of self after described TFT conducting controls described mems switch.
3. dot structure as claimed in claim 2, it is characterized in that, described mems switch comprises connecting portion and switch portion, the drain electrode of described connecting portion and described TFT is electrically connected, and described switch portion is arranged at the light direction side of described QLED device to control the light quantity of the emergent light of described QLED device.
4. dot structure as claimed in claim 3, it is characterized in that, described dot structure also comprises shading strip, and described shading strip is positioned at the below of the edge of the close described QLED device side of described mems switch.
5. dot structure as claimed in claim 4, it is characterized in that, described dot structure also comprises the first conductive structure, and described mems switch is electrically connected by the drain electrode of described first conductive structure and described TFT.
6. dot structure as claimed in claim 5, it is characterized in that, be provided with insulation course between the drain electrode of described TFT and the connecting portion of described mems switch, described first conductive structure is electrically connected by the drain electrode of the first via hole on described insulation course and described TFT.
7. dot structure as claimed in claim 6, is characterized in that, described shading strip and described first conductive structure are arranged with layer and insulated from each other, and the material of described first conductive structure and described shading strip is metal material.
8. an array base palte, comprises multiple pixel cells of array arrangement, it is characterized in that, pixel cell described in each adopts dot structure as described in any one of claim 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420838816.7U CN204288767U (en) | 2014-12-24 | 2014-12-24 | A kind of dot structure and array base palte |
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| CN201420838816.7U CN204288767U (en) | 2014-12-24 | 2014-12-24 | A kind of dot structure and array base palte |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464632A (en) * | 2014-12-24 | 2015-03-25 | 京东方科技集团股份有限公司 | Pixel structure, manufacturing method thereof, pixel display method and array substrate |
| CN105185243A (en) * | 2015-10-15 | 2015-12-23 | 京东方科技集团股份有限公司 | Display substrate, display device and display method |
-
2014
- 2014-12-24 CN CN201420838816.7U patent/CN204288767U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464632A (en) * | 2014-12-24 | 2015-03-25 | 京东方科技集团股份有限公司 | Pixel structure, manufacturing method thereof, pixel display method and array substrate |
| WO2016101442A1 (en) * | 2014-12-24 | 2016-06-30 | 京东方科技集团股份有限公司 | Pixel structure, manufacturing method thereof, pixel display method and array substrate |
| US20160358539A1 (en) | 2014-12-24 | 2016-12-08 | Boe Technology Group Co., Ltd. | A pixel structure and a preparation method thereof, a pixel display method and an array substrate |
| US10049612B2 (en) | 2014-12-24 | 2018-08-14 | Boe Technology Group Co., Ltd. | Pixel structure and a preparation method thereof, a pixel display method and an array substrate |
| CN105185243A (en) * | 2015-10-15 | 2015-12-23 | 京东方科技集团股份有限公司 | Display substrate, display device and display method |
| CN105185243B (en) * | 2015-10-15 | 2018-01-09 | 京东方科技集团股份有限公司 | A kind of display base plate, display device and display methods |
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