CN103295531B - Luminance enhanced and display effect improved PMOLED (passive matrix organic light-emitting diode) displayer - Google Patents
Luminance enhanced and display effect improved PMOLED (passive matrix organic light-emitting diode) displayer Download PDFInfo
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- CN103295531B CN103295531B CN201310270710.1A CN201310270710A CN103295531B CN 103295531 B CN103295531 B CN 103295531B CN 201310270710 A CN201310270710 A CN 201310270710A CN 103295531 B CN103295531 B CN 103295531B
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Abstract
The invention provides a luminance enhanced and display effect improved PMOLED (passive matrix organic light-emitting diode) displayer comprising a panel providing with a plurality of pixel units arranging into an array and a driving chip providing with a plurality of common ends and scanning ends, wherein pins of the common ends are drew out from the middle of the driving chip which is connected with the corresponding common end on the panel close to one side of the driving chip through a first off-chip routing; pins of the scanning ends are drew out by the driving chip which is respectively connected with the scanning ends corresponding to the left side and the right side of the panel through a second off-chip routing; the driving chip comprises a plurality of common end buffer cells inside, one end of the driving chip is connected with the common ends, the other end of the driving chip is connected with ground of the common ends through an on-chip grounding routing, and value of resistance of a common end resistor composed of the common end buffer units and the on-ship grounding routing is within 15 ohm. The luminance of the PMOLED displayer can be enhanced, the display effect thereof can be improved, and zebra-stripe phenomenon can be avoided.
Description
Technical field
The present invention relates to passive matrix Organic Light Emitting Diode (Passive Matrix Organic Light-EmittingDiode is called for short PMOLED) technical field, specifically, the present invention relates to a kind of PMOLED display screen highlighting and improve display effect.
Background technology
Current PMOLED driving chip (driver IC) generally has two kinds of packing forms: COG(Chip OnGlass), COF(Chip On Flex or Chip On Film).Cabling in COF encapsulation is copper, and resistance can be ignored, so display effect is good, but cost is very high.And COG encapsulation is due to low cost, be widely adopted, but it still adopts indium tin oxide (ITO) in the upper common port (com) of panel (panel), scanning end (seg) cabling main flow way, and the line of common port between each pixel cell (pixel cell) also adopts the material of molybdenum aluminium molybdenum now, the resistivity of ITO and molybdenum aluminium molybdenum is all bigger than normal.The common port of traditional scheme driving chip adopts both sides to go out the mode of pin (pin), on panel, ITO cabling is long and have turning, and the common port spacing of traditional scheme driving chip (com pitch) is smaller, the ITO cabling of common port is also narrow.The common port buffer cell (combuf) of adding traditional scheme driving chip is general more than 20 ohm (also bigger than normal), because the electric current on common port is more than large in scanning end, the pressure drop caused due to the big current on common port on whole display loop for the high-voltage power supply (vpp) that shows like this is just larger, will be lower to the voltage on the display unit of final panel, cause and adopt the PMOLED brightness of display screen of COG encapsulation to be generally no more than 100nits(cd/m
2, i.e. candle power brilliance/square meter).This kind of traditional scheme wants to obtain reasonable brightness demand, needs to adopt COF encapsulation, needs like this to increase a lot of cost.
In addition, the common port both sides of the PMOLED driving chip of traditional scheme go out pin, if adopt common port odd even to choose mode, the adjacent common port chosen derives from driving the right and left respectively, and display also can exist zebra-stripe phenomenon.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of PMOLED display screen, can strengthen display brightness and improve display effect, avoiding occurring zebra-stripe phenomenon.
For solving the problems of the technologies described above, the invention provides a kind of PMOLED display screen highlighting and improve display effect, comprising:
Panel, described panel has the multiple pixel cells lining up array;
Driving chip, described driving chip has multiple common port and multiple scanning end;
Wherein, described driving chip, from its middle pin of drawing described common port, is connected with the corresponding described common port near described driving chip side on described panel by the outer cabling of first; Described driving chip draws the pin of described scanning end from its both sides, and the described scanning end corresponding with the described panel left and right sides respectively by second outer cabling is connected;
Described driving chip inside comprises multiple common port buffer cell, its side is connected with described common port, opposite side is connected with the ground of described common port by ground connection cabling in sheet, within the resistance of the common port internal resistance be made up of described common port buffer cell and described interior ground connection cabling is 15 ohm.
Alternatively, described driving chip adopts glass top chip (COG) packing forms.
Alternatively, the outer cabling of described first and/or second outer cabling are indium tin oxide (ITO) cabling.
Alternatively, the width range of the outer cabling of described first is 50 ~ 80 μm.
Alternatively, the width of described interior ground connection cabling is more than 120 μm.
Compared with prior art, the present invention has the following advantages:
The present invention draws pin mode by the common port improving PMOLED driving chip and increases the mode of common port spacing, common port ITO cabling on panel is made to shorten and broaden, add some measures to reduce the common port internal resistance of driving chip, under finally can solving the prerequisite that driving chip adopts cheap COG to encapsulate, as molybdenum aluminium molybdenum PMOLED display screen display brightness not and the problem of zebra-stripe.
The present invention shows field (such as the field such as wireless router, vehicle audio display) at the PMOLED of some outdoor application, and have a wide range of applications sight.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage become more obvious by passing through below in conjunction with the description of drawings and Examples, wherein:
Fig. 1 is the common port of a PMOLED display screen of the prior art and the schematic diagram of scanning end show circuit;
Fig. 2 is the schematic diagram of driving chip from the pin of both sides extraction common port of a PMOLED display screen of the prior art;
Fig. 3 is the schematic diagram of driving chip from the pin of centre extraction common port of the PMOLED display screen of one embodiment of the invention.
Embodiment
The present invention reduces the outer track lengths of the ITO sheet of common port on panel by the public pin mode that brings out changing PMOLED driving chip, increase the common port spacing (usually will increase to more than 50um) of driving chip simultaneously, widen the outer trace width of the ITO sheet of common port on panel.Also increase the common port resistance size (resistance decline) of driving chip inside in addition, widen trace width in VCL sheet, to reduce common port resistance further.These two measures are all to reduce the all-in resistance of common port in whole display loop, thus the pressure drop that reduction causes due to the big current of common port for the high-voltage power supply (vpp) shown, finally improve PMOLED display brightness, even if such driving chip adopts cheap COG encapsulation, the brightness of PMOLED display screen also can reach more than 200nits.Then because common port goes out pin continuously in the middle of driving chip, the zebra-stripe effect shown can be stopped again.
Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth more details in the following description so that fully understand the present invention; but the present invention obviously can implement with multiple this alternate manner described that is different from; those skilled in the art can when doing similar popularization, deduction without prejudice to when intension of the present invention according to practical situations, therefore should with content constraints protection scope of the present invention of this specific embodiment.
Fig. 1 is the common port of a PMOLED display screen of the prior art and the schematic diagram of scanning end show circuit.As shown in Figure 1, it is the PMOLED driving chip of 128 × 128 dot matrix and the common port com of PMOLED panel and scanning end seg0 ... the schematic diagram in seg127 loop.In Fig. 1 for the purpose of simple, merely illustrate 1 common port com, eliminate other common ports, in fact the quantity of common port also has 128.
Finally drop on the pressure reduction Vcell=vpp – (Icom × (Rcom+Rbuf+Rvcl)+Iseg × Rseg) on each pixel cell,
Wherein, vpp is the high-voltage power supply for Display panel of input, Icom, Iseg flow through the electric current in each common port and scanning end, Rcom, Rseg are the outer trace resistances (COG encapsulates) of each common port and the sheet of scanning end on panel, Rbuf is the nmos switch resistance of common port impact damper in driving chip, Rvcl is the resistance of VCL line in driving chip, Rbuf and Rvcl together constitutes common port internal resistance.
In order to more clearly show the difference between the present invention and prior art, first the public pin mode that brings out of the prior art once being introduced, contrasting with the present invention in order to follow-up.
Fig. 2 is the schematic diagram of driving chip from the pin of both sides extraction common port of a PMOLED display screen of the prior art.Traditional common port both sides are gone out to the situation of pin, common port scanning adopts the mode of odd-even interleaving, i.e. com0->com64->com1->com65 ... com63->com127.As shown in Figure 2, common port com0 ... com63, com64 ... com127 from driving chip 202 out on panel 201 ITO cabling 203 long and left and right is respectively divided into three sections, have turning.And due to common port spacing smaller, make ITO cabling 203 width of common port narrow again, the outer trace resistances Rcom of this kind of situation common port sheet on panel can reach more than 80 ohm usually.
Fig. 3 is the schematic diagram of driving chip from the pin of centre extraction common port of the PMOLED display screen of one embodiment of the invention.For the situation going out pin in the middle of common port, this PMOLED display screen mainly comprises panel 301 and driving chip 302.Panel 301 has 128 × 128 the pixel cell (not shown) lining up array, and driving chip 302 can adopt glass top chip (COG) packing forms, has multiple common port com0 ... comN and multiple scanning end seg0 ... segN, N are natural number.In the present embodiment, N is 127, but this numerical value only exemplarily, not limits the scope of the invention with this.
Wherein, driving chip 302 is from its middle extraction common port com0 ... the pin of com127, by the outer cabling 303 of first and the corresponding common port com0 near driving chip 302 side on panel 301 ... com127 is connected, and the width range of the outer cabling 303 of this first is 50 ~ 80 μm.Driving chip 302 draws scanning end seg0 from its both sides ... the pin of seg127, by the scanning end seg0 that second outer cabling 304 is corresponding with panel 301 left and right sides respectively ... seg127 is connected.The outer cabling 303 of this first or this second outer cabling 304 are generally indium tin oxide (ITO) cabling.
Shown in Fig. 1 and Fig. 3, this driving chip 302 inside comprises multiple common port buffer cell combuf, its side and common port com0 ... com127 is connected, and opposite side is by ground connection cabling and common port com0 in sheet ... the ground VCL of com127 is connected.Within the resistance of the internal resistance (Rvcl+Rbuf) that the common port be made up of ground connection cabling in this common port buffer cell combuf and this sheet is total can be 15 ohm, in this sheet, the width of ground connection cabling is more than 120 μm.
So, common port com0 ... com127 ITO cabling 303 on panel 301 is shorter and be straight line, does not have turning.And due to common port gap ratio comparatively large, make common port ITO cabling 303 wider (50 ~ 80 μm) again, the outer trace resistances Rcom of the sheet of this kind of situation common port on panel usually can below 20 ohm.
Suppose the high-voltage power supply vpp=15V for showing inputted, if display brightness will reach more than 200nits, usually in every bar scanning end, electric current Iseg will reach 500 μ A, and for the PMOLED of 128 × 128 dot matrix, the electric current I com on every bar common port is exactly 128 × 500 μ A=64mA.
Like this, for traditional scheme:
Vcell=15–(64m×(80+20)+0.5m×2k)=7.6V
And for improvement project of the present invention:
Vcell=15–(64m×(20+15)+0.5m×2k)=11.76V
For the panel of more than 128 line numbers, generally in order to life-extending, usual panel can adopt high-pressure process, so the pressure reduction Vcell on most Zhongdao pixel cell needs to reach more than 10V, just can reach reasonable display brightness.So traditional scheme display brightness in driving chip COG encapsulation situation does not reach 200nits at all, and the present invention can reach.
In addition, pin is gone out for traditional common port both sides, common port odd-even interleaving can be chosen by instruction and choose mode, namely scanning sequency is: com0->com64->com1->com63 ... the adjacent common port chosen derives from driving chip the right and left respectively, their cabling diversity ratios in sheet and outside sheet are large with on one side adjacent common port, so can cause zebra-stripe effect.
And for going out pin in the middle of common port of the present invention, its scanning sequency can be: com0->com1->com2->com3 ... it is middle and continuous that the adjacent common port chosen all derives from driving chip, so can stop the zebra-stripe effect shown.
In sum, go out pin in the middle of the driving chip common port of PMOLED of the present invention, even if driving chip adopts cheap COG to encapsulate like this, on panel, ITO cabling is also shorter and without turning, and the common port spacing of driving chip is suitably amplified, the ITO cabling of common port just can be wider.The common port internal resistance of adding driving chip inside is accomplished within 15 ohm, the pressure drop caused due to big current on common port for the high-voltage power supply vpp that shows like this is just smaller, to the pixel cell on final panel, voltage will be higher, the final display brightness greatly strengthening PMOLED display screen, can be strengthened to more than 200nits from original below 100nits.Some are had to the application (such as wireless router, vehicle audio display etc.) of outdoor display demand, brightness strengthens important in inhibiting.
Go out pin in the middle of the driving chip common port of PMOLED of the present invention, it is middle and continuous that the adjacent common port chosen all derives from driving chip, stopped display zebra-stripe phenomenon, improved display effect.
Although the present invention with preferred embodiment openly as above, it is not that any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment for limiting the present invention.Therefore, every content not departing from technical solution of the present invention, any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all fall within protection domain that the claims in the present invention define.
Claims (5)
1. highlight and improve the PMOLED display screen of display effect, comprising:
Panel (301), described panel (301) has the multiple pixel cells lining up array;
Driving chip (302), described driving chip (302) has multiple common port com0 ... comN and multiple scanning end seg0 ... segN, N are natural number;
Wherein, described driving chip (302) is from the described common port com0 of its middle extraction ... the pin of comN, by the outer cabling (303) of first corresponding described common port com0 near described driving chip (302) side upper with described panel (301) ... comN is connected; Described driving chip (302) draws described scanning end seg0 from its both sides ... the pin of segN, by the described scanning end seg0 that second outer cabling (304) is corresponding with described panel (301) left and right sides respectively ... segN is connected;
Described driving chip (302) inside comprises multiple common port buffer cell (combuf), its side and described common port com0 ... comN is connected, opposite side is by ground connection cabling and described common port com0 in sheet ... the ground (VCL) of comN is connected, within the resistance of the common port internal resistance be made up of described common port buffer cell (combuf) and described interior ground connection cabling is 15 ohm.
2. PMOLED display screen according to claim 1, is characterized in that, described driving chip (302) adopts glass top chip (COG) packing forms.
3. PMOLED display screen according to claim 2, is characterized in that, the outer cabling (303) of described first and/or second outer cabling (304) are indium tin oxide (ITO) cabling.
4. PMOLED display screen according to claim 3, is characterized in that, the width range of the outer cabling (303) of described first is 50 ~ 80 μm.
5. PMOLED display screen according to claim 4, is characterized in that, the width of described interior ground connection cabling is more than 120 μm.
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| CN201310270710.1A CN103295531B (en) | 2013-06-27 | 2013-06-27 | Luminance enhanced and display effect improved PMOLED (passive matrix organic light-emitting diode) displayer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334564A (en) * | 2007-06-28 | 2008-12-31 | 上海广电Nec液晶显示器有限公司 | LCD and making method thereof |
| CN102420224A (en) * | 2011-11-08 | 2012-04-18 | 友达光电股份有限公司 | Display panel |
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| JP4783890B2 (en) * | 2000-02-18 | 2011-09-28 | 株式会社 日立ディスプレイズ | Liquid crystal display |
| JP5394655B2 (en) * | 2008-04-28 | 2014-01-22 | 株式会社ジャパンディスプレイ | Liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334564A (en) * | 2007-06-28 | 2008-12-31 | 上海广电Nec液晶显示器有限公司 | LCD and making method thereof |
| CN102420224A (en) * | 2011-11-08 | 2012-04-18 | 友达光电股份有限公司 | Display panel |
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Effective date of registration: 20161213 Address after: 200335 Shanghai city Changning District Admiralty road 767 Lane 3 Building No. 1 Patentee after: CHIP WEALTH TECHNOLOGY LTD. Address before: 200335 Shanghai city Changning District Admiralty road 767 Lane 3 Patentee before: SINO WEALTH MICROELECTRONICS Co.,Ltd. |