CN101699343B - Electrophoretic display pixel and display device - Google Patents
Electrophoretic display pixel and display device Download PDFInfo
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- CN101699343B CN101699343B CN2009102118878A CN200910211887A CN101699343B CN 101699343 B CN101699343 B CN 101699343B CN 2009102118878 A CN2009102118878 A CN 2009102118878A CN 200910211887 A CN200910211887 A CN 200910211887A CN 101699343 B CN101699343 B CN 101699343B
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Abstract
The invention discloses an electrophoretic display pixel, which comprises an electrophoretic display film, a substrate, a first active element, a second active element, a first electrode and a second electrode. The substrate is arranged on the electrophoretic display film, and is provided with a transparent area and a non-transparent area. The first active element and the second active element are arranged on the substrate and are positioned in the non-transparent area. The first electrode is arranged on the substrate, is positioned in the transparent area and is electrically connected with the first active element, while the second electrode is arranged on the substrate, is positioned in the non-transparent area and is electrically connected with the second active element. A light ray penetrates through the transparent area and enters the electrophoretic display film for displaying. The invention also discloses a display device comprising the electrophoretic display pixel.
Description
Technical field
The present invention relates to a kind of electrophoretic display pixel and display device, and particularly relevant for a kind of electrophoretic display pixel and display device with high demonstration contrast.
Background technology
In the development flat-panel screens, on the market for have gentlier, characteristic thinner and deflection is the target that following display is mainly pursued always.The employed display technique of such flexible display, Electronic Paper and e-book comprises lcd technology, electrophoretic display technology and electrochromism developing technology etc.
Electrophoretic display device (EPD) comprises active component array base board and is attached at the electrophoretic display thin film on the active component array base board.Having one in the electrophoretic display thin film shows matrix and is distributed in a plurality of demonstration particles that show in the matrix.Show that matrix for example is a kind of demonstration solution, show that particle then is the particle that has positive electricity or negative electricity polarity.Active component array base board then includes a plurality of dot structures of being made up of an active member and a pixel electrode.
The user generally is that the position is being watched away from a side of active component array base board near electrophoretic display thin film, and a side that is to say active component array base board is non-demonstration side, and electrophoretic display thin film belongs to a side for showing side.The display mode of electrophoretic display device (EPD) is to give pixel electrode through the signal that the active member on the active component array base board is imported different voltages, lets the electric field in the electrophoretic display thin film change, so that these show that particles move.These show that particle can be with the light reflection in the external world.So,, show particle if away from showing that side shifting then demonstrates the color that shows matrix when these show particle towards showing that side shifting then demonstrates the color of particle.
Summary of the invention
The present invention provides a kind of electrophoretic display pixel, has the high contrast that shows.
The present invention provides a kind of display device, has the electrophoretic display pixel of a plurality of high demonstration contrasts.
The present invention proposes a kind of electrophoretic display pixel, and it comprises an electrophoretic display thin film, a substrate, one first active member, one second active member, one first electrode and one second electrode.Substrate is disposed on the electrophoretic display thin film, and has a photic zone and a non-photic zone.First active member and second active member all are disposed on the substrate and are arranged in non-photic zone.First electrode is disposed on the substrate, is arranged in photic zone, and electrically connects first active member, and second electrode then is disposed on the substrate, is arranged in non-photic zone, and electrically connects second active member.One light penetration photic zone and get into electrophoretic display thin film to show.
In one embodiment of this invention, above-mentioned first active member and second active member comprise a grid, one source pole and a drain electrode respectively.Source electrode lays respectively at the both sides of grid with drain electrode, and first electrode electrically connects the drain electrode of first active member, and second electrode electrically connects the drain electrode of second active member.The material of grid, source electrode and drain electrode for example is a non-printing opacity conductive material.In addition, electrophoretic display pixel more comprises a capacitance electrode, and it is disposed on the substrate and is arranged in non-photic zone.The material of capacitance electrode also for example is a non-printing opacity conductive material.
In one embodiment of this invention; Above-mentioned electrophoretic display pixel more comprises two sweep traces and a data line; First active member and second active member electrically connect wherein sweep trace respectively, and first active member and second active member electrically connect data line.
In one embodiment of this invention; Above-mentioned electrophoretic display pixel more comprises one scan line and two data lines; First active member and second active member electrically connect sweep trace, and first active member and second active member electrically connect wherein data line respectively.
In one embodiment of this invention, above-mentioned electrophoretic display thin film has an electrode layer, a demonstration matrix and an a plurality of demonstration particle.Show distribution of particles in showing matrix, and electrode layer and active device substrate are positioned at the relative both sides of demonstration matrix.Show that particle for example is arranged in photic zone or non-photic zone by the Polarity Control of first electrode and second electrode.
The present invention reintroduces a kind of display device, and it comprises a plurality of above-mentioned electrophoretic display pixels.
In one embodiment of this invention, above-mentioned display device comprises electric paper display, flexible type display panel.
Based on above-mentioned, the present invention is disposed at the demonstration side with active member, so have lighttight element on the demonstration side of electrophoretic display pixel.When electrophoretic display pixel shows the black picture, show that particle can be positioned at light tight element under and crested shows and contrasts to improve.Therefore, electrophoretic display pixel of the present invention and display device have superior display effect, and just it shows that contrast is quite good.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and cooperates appended accompanying drawing to elaborate as follows.
Description of drawings
For letting above-mentioned and other purposes of the present invention, characteristic, advantage and the embodiment can be more obviously understandable, the explanation of appended accompanying drawing be following:
Fig. 1 illustrates the schematic top plan view into the electrophoretic display pixel of one embodiment of the invention;
Fig. 2 illustrates the diagrammatic cross-section that the electrophoretic display pixel for Fig. 1 is illustrated along hatching line A-A ';
Fig. 3 A-Fig. 3 C illustrates three kinds of view that show for Fig. 1 and electrophoretic display pixel shown in Figure 2;
Fig. 4 illustrates the schematic top plan view into the partial component of the electrophoretic display pixel of another embodiment of the present invention.
Wherein, Reference numeral
100,200: electrophoretic display pixel 110: electrophoretic display thin film
112: electrode layer 114: show matrix
116: show particle 118: light-absorption layer
120: substrate 122: photic zone
124: 130: the first active members of non-photic zone
140: the second active members of 150: the first electrodes
170: 160: the second electrodes of capacitance electrode
190,292,294: data line 182,184,280: sweep trace
A-A ': hatching line D: drain electrode
G: grid S: source electrode
I, II, III: state L: light
Embodiment
Fig. 1 illustrates the schematic top plan view into the electrophoretic display pixel of one embodiment of the invention, and Fig. 2 illustrates the diagrammatic cross-section that the electrophoretic display pixel for Fig. 1 is illustrated along hatching line A-A '.Please be simultaneously with reference to Fig. 1 and Fig. 2, electrophoretic display pixel 100 comprises electrophoretic display thin film 110, substrate 120, first active member 130, second active member 140, first electrode 150 and second electrode 160.Substrate 120 is disposed on the electrophoretic display thin film 110, and has photic zone 122 and non-photic zone 124.First active member 130 and second active member 140 all are disposed on the substrate 120 and are arranged in non-photic zone 124.First electrode 150 is disposed on the substrate 120, is arranged in photic zone 122, and electrically connects first active member, 130, the second electrodes 160 and then be disposed on the substrate 120, is arranged in non-photic zone 124, and electrically connects second active member 140.
Particularly, electrophoretic display thin film 110 has electrode layer 112, shows matrix 114 and a plurality of demonstration particle 116.Show that particle 116 is distributed in the demonstration matrix 114, and electrode layer 112 is positioned at the relative both sides that show matrix 114 with substrate 120.With present embodiment, light L penetrates photic zone 122 and gets into electrophoretic display thin film 110 and then be reflected out to show, so a side at substrate 120 places is for showing side.
In other words, when the user has the electronic installation of electrophoretic display pixel 100 in use, be a side that is positioned at light L place, and the user watch picture along the incident direction of light L.Therefore, the material of first electrode 150 and second electrode 160 for example is the electrically conducting transparent material.In order to promote display quality, electrophoretic display pixel 100 for example more comprises light-absorption layer 118, and it is disposed at the side of electrophoretic display thin film 110 away from substrate 120.
Fig. 3 A to Fig. 3 C illustrates three kinds of view that show for Fig. 1 and electrophoretic display pixel shown in Figure 2, and wherein Fig. 3 A to Fig. 3 C only shows briefly and shows film, first electrode and second electrode.Please, show that particle 116 generally is the particle that has positive charge or negative charge, so show that moving of particle 116 for example can be by the electric field controls of electrode layer 112, first electrode 150 and second electrode 160 with reference to Fig. 3 A to Fig. 3 C.
Shown in Fig. 3 A, when state I, suppose to show that particle 116 is positively charged, electrode layer 112 is bestowed negative voltage, and first electrode 150 and second electrode 160 are bestowed positive voltage.So,, show that particle 116 can move and near the surface of electrode layer 112 towards electrode layer 112 according to the direction and the distribution of electric field.At this moment, light L can pass earlier and show that matrix 114 then is shown particle 116 reflections.So when state I, the user watches along the incident direction of light L, can see that electrophoretic display pixel 100 presents the color that shows matrix 114.If it is red showing matrix 114, then electrophoretic display pixel 100 presents red picture under state I.Certainly, the color of demonstration matrix 114 can become with different designs.
Shown in Fig. 3 B, when state I I, suppose to show that particle 116 is positively charged, electrode layer 112 is bestowed positive voltage, and first electrode 150 and second electrode 160 are bestowed negative voltage.So, according to the direction and the distribution of electric field, the surface that the moving direction of demonstration particle 116 can tend to first electrode 150 and second electrode 160.At this moment, light L directly is shown particle 116 reflections and the color of demonstration particle 116.If showing particle 116 is white, under state I I, the user watches along the incident direction of light L, can see electrophoretic display pixel 100 show white pictures.Likewise, different with the color that shows particle 116, electrophoretic display pixel 100 is also different in state I I picture displayed color.In other words, under state I I, the user can see the color that shows that particle 116 is appeared.
Shown in Fig. 3 C, when state I II, suppose to show that particle 116 is positively charged, the electrode layer 112 and first electrode 150 are bestowed positive voltage, and only have second electrode 160 to be bestowed negative voltage.According to the direction and the distribution of electric field, positively charged demonstration particle 116 can move in second electrode, 160 regions.That is to say that the demonstration particle 116 of present embodiment also can be controlled the transversal displacement that shows particle 116 through the electric field change of first electrode 150 and second electrode 160 except carrying out the displacement longitudinally.
Light L can know that by Fig. 1, Fig. 2 and Fig. 3 A-Fig. 3 C second electrode, 160 positions are non-photic zone 124, so can not be shown particle 116 reflections and absorbed by light-absorption layer 118 under the state I II shown in Fig. 3 C.So when electrophoretic display thin film 110 was watched, light L can not be reflected out and can see that electrophoretic display pixel 100 presents the picture of black the user by a side of substrate 120.What deserves to be mentioned is that second electrode, 160 positions of present embodiment can't printing opacity,, also be difficult for being reflected away so light L shows particle 116 under the state I II shown in Fig. 3 C, being difficult for being incident to.Thus, electrophoretic display pixel 100 is not easy to produce reflected light when showing the black picture and can demonstrates black black picture.Through such design, electrophoretic display pixel 100 promptly has quite high demonstration contrast.
Specifically, please continue with reference to Fig. 1 and Fig. 2, electrophoretic display pixel 100 more comprises two sweep traces 182,184 and a data line 190.First active member 130 electrically connects sweep trace 182, and second active member 140 electrically connects sweep trace 184, and first active member 130 and the same data line 190 of second active member, 140 electric connections.First active member 130 of present embodiment and second active member 140 are connected to sweep trace 182 and sweep trace 184 respectively.So first electrode 150 and second electrode 160 can have different voltages with different shows particle 116 with control transversal displacement.
In the present embodiment, first active member 130 and second active member 140 comprise a grid G, one source pole S and a drain D respectively.Source S and drain D lay respectively at the both sides of grid G, and the drain D of first electrode, 150 electric connections, first active member 130, and second electrode 160 electrically connects the drain D of second active member 140.First active member 130 and second active member 140 are essentially thin film transistor (TFT).The material of grid G, source S and drain D for example is a non-printing opacity conductive material.
In addition, electrophoretic display pixel 100 more comprises capacitance electrode 170, and it is disposed on the substrate 120 and is arranged in non-photic zone 124.The drain D of the drain D of first active member 130 and second active member 140 is overlapping to constitute corresponding storage capacitors with capacitance electrode 170 respectively.Storage capacitors be designed with the exhibit stabilization that helps keep electrophoretic display pixel 100.In addition, the material of capacitance electrode 170 also for example is a non-printing opacity conductive material.
Sweep trace 182,184, data line 190, first active member 130, second active member 140 and capacitance electrode 170 all are light tight elements.Therefore, the non-photic zone 124 of present embodiment can be said so and defined out by these light tight element positions.These light tight arrangements of components are in showing side (side at substrate 120 places just is just near user's a side).So the electrophoretic display pixel 100 of present embodiment can borrowed these light tight elements to cover unnecessary light leak or stop that light L is by the demonstration contrast of 116 reflections of the demonstration particle in the non-photic zone 124 thereby lifting electrophoretic display pixel 100.
Furthermore, the electrophoretic display pixel 100 of present embodiment need not dispose extra shading element and just can improve display quality effectively.Therefore, the electrophoretic display pixel 100 of present embodiment can adopt existing technology to make, and can not cause the complicated of processing step.In addition, it is that the present invention does not limit the element that is arranged in non-photic zone 124 for which kind of element, and these elements can comprise that thin-film transistor element, storage capacitors etc. comprise that at least a non-photic zone is to stop or to reduce the element that penetrates of light.
In detail, the production method of electrophoretic display pixel 100 for example is that the production method that utilizes thin film deposition processes and photoetching process etc. to can be applicable to active cell array elements such as sweep trace 182,184, data line 190, first active member 130, second active member 140, first electrode 150, second electrode 160 and capacitance electrode 170 earlier is made on the substrate 120.Then, a side that again substrate 120 is disposed said elements is with electrophoretic display thin film 110 assemblings or be attached to.In other words, the production method of the production method of electrophoretic display pixel 100 and electrophoretic display device (EPD) in the past is roughly the same.
Because the element of electrophoretic display pixel 100 is all identical with the element of known electrophoretic displays, the design of present embodiment can be accomplished the high design that shows contrast under the prerequisite that does not change element.So the design of present embodiment can't cause technologic complicated or increase the weight of the cost of technology.At this, electrophoretic display pixel 100 for example can be applied in electric paper display or the flexible display.
Fig. 4 illustrates the schematic top plan view into the partial component of the electrophoretic display pixel of another embodiment of the present invention, and wherein Fig. 4 has omitted electrophoretic display thin film and substrate.Please with reference to Fig. 4, in the another kind of electrophoretic display pixel 200, first active member 130 and second active member 140 are by a sweep trace 280 and 292,294 drivings of two data lines.First active member 130 and second active member 140 electrically connect same sweep trace 280.In addition, first active member 130 electrically connects data line 292, and second active member 140 electrically connects data line 294.
Present embodiment is through corresponding signal to the first electrode 150 and second electrode 160 of different data lines 292,294 transmission.So each the free separate signal decision of the polarity of first electrode 150 and second electrode 160 shows the moving direction and the position of the demonstration particle (not illustrating) in the film (not illustrating) with control.In addition, the design of present embodiment and previous embodiment all are that position with light tight elements such as first active member 130, second active member 140, capacitance electrodes 170 is defined as non-photic zone.And second electrode 160 all is to be arranged in non-photic zone.So, when showing the black picture, only need to show that particle (not illustrating) is attracted to second electrode, 160 positions and just is not easy reflection ray.That is to say that electrophoretic display pixel 200 can show black black picture and have higher demonstration contrast.
Similarly, the design of present embodiment mainly is lighttight element is arranged at the demonstration side near the user.So, when the electrophoretic display pixel 200 of present embodiment shows the black picture, can utilize existing light tight element to cover and show particle (not illustrating).Thus, the black picture that shows of electrophoretic display pixel 200 is enough black and reach the high display effect that contrasts that shows.
In sum, the substrate that disposed of the present invention's active member is set to show side.So the element that active member and capacitance electrode etc. has light tight character can define non-photic zone on substrate.The present invention in photic zone and non-photic zone, disposes first electrode respectively and second electrode shows laterally moving of particle with control.Show when particle laterally moves to the second electrode region that showing that particle can be covered by light tight element can't reflection ray and can show black black picture.So electrophoretic display pixel of the present invention and display device have pretty good demonstration contrast.Under such design, the element of electrophoretic display pixel and method for making need not have significantly change, that is to say, the present invention can be issued to the high display effect that shows contrast in existing element design.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (12)
1. an electrophoretic display pixel is characterized in that, this electrophoretic display pixel comprises:
One electrophoretic display thin film;
One substrate is disposed on this electrophoretic display thin film, is positioned at the demonstration side of this electrophoretic display pixel, has a photic zone and a non-photic zone;
One first active member is disposed on this substrate and is arranged in this non-photic zone;
One second active member is disposed on this substrate and is arranged in this non-photic zone;
One first electrode is disposed on this substrate, is arranged in this photic zone, and electrically connects this first active member; And
One second electrode is disposed on this substrate, is arranged in this non-photic zone, and electrically connects this second active member;
This photic zone of one light penetration and get into this electrophoretic display thin film to show; Wherein,
This first active member and this second active member comprise a grid, one source pole and a drain electrode respectively; This source electrode and this drain electrode lay respectively at the both sides of this grid; And this first electrode electrically connects this drain electrode of this first active member, and this second electrode electrically connects this drain electrode of this second active member.
2. electrophoretic display pixel according to claim 1 is characterized in that, the material of this grid, this source electrode and this drain electrode is a non-printing opacity conductive material.
3. electrophoretic display pixel according to claim 1 is characterized in that this electrophoretic display pixel also comprises a capacitance electrode, is disposed on this substrate and is arranged in this non-photic zone.
4. electrophoretic display pixel according to claim 3 is characterized in that, this drain electrode of this drain electrode of this first active member and this second active member overlaps with this capacitance electrode respectively.
5. electrophoretic display pixel according to claim 3 is characterized in that, the material of this capacitance electrode is a non-printing opacity conductive material.
6. electrophoretic display pixel according to claim 1; It is characterized in that; This electrophoretic display pixel also comprises two sweep traces and a data line; This first active member and this second active member electrically connect wherein sweep trace respectively, and this first active member and this second active member electrically connect this data line.
7. electrophoretic display pixel according to claim 1; It is characterized in that; This electrophoretic display pixel also comprises one scan line and two data lines; This first active member and this second active member electrically connect this sweep trace, and this first active member and this second active member electrically connect wherein data line respectively.
8. electrophoretic display pixel according to claim 1 is characterized in that this electrophoretic display pixel also comprises a light-absorption layer, is disposed at the side of this electrophoretic display thin film away from this substrate.
9. electrophoretic display pixel according to claim 1; It is characterized in that; This electrophoretic display thin film has an electrode layer, and shows matrix and a plurality of demonstration particle, and said demonstration distribution of particles shows in matrix in this, and this electrode layer and this substrate are positioned at the relative both sides of this demonstration matrix.
10. electrophoretic display pixel according to claim 9 is characterized in that, said demonstration particle is arranged in this photic zone or this non-photic zone by the Polarity Control of this first electrode and this second electrode.
11. a display device is characterized in that, this display device comprises a plurality of electrophoretic display pixels as claimed in claim 1.
12. display device according to claim 11 is characterized in that, this display device comprises electric paper display or flexible type display panel.
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| CN2009102118878A CN101699343B (en) | 2009-11-09 | 2009-11-09 | Electrophoretic display pixel and display device |
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| CN2009102118878A CN101699343B (en) | 2009-11-09 | 2009-11-09 | Electrophoretic display pixel and display device |
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| CN101699343A CN101699343A (en) | 2010-04-28 |
| CN101699343B true CN101699343B (en) | 2012-01-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908794A (en) * | 2005-08-01 | 2007-02-07 | Nec液晶技术株式会社 | Color electronic paper display device |
| CN101093335A (en) * | 2006-06-22 | 2007-12-26 | 三星电子株式会社 | Electrophoretic display and manufacturing method thereof |
| CN101169567A (en) * | 2006-10-25 | 2008-04-30 | 精工爱普生株式会社 | Electro-optical device and electronic apparatus |
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- 2009-11-09 CN CN2009102118878A patent/CN101699343B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908794A (en) * | 2005-08-01 | 2007-02-07 | Nec液晶技术株式会社 | Color electronic paper display device |
| CN101093335A (en) * | 2006-06-22 | 2007-12-26 | 三星电子株式会社 | Electrophoretic display and manufacturing method thereof |
| CN101169567A (en) * | 2006-10-25 | 2008-04-30 | 精工爱普生株式会社 | Electro-optical device and electronic apparatus |
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