CN104252832A - LED (light emitting diode) display panel - Google Patents
LED (light emitting diode) display panel Download PDFInfo
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- CN104252832A CN104252832A CN201310263064.6A CN201310263064A CN104252832A CN 104252832 A CN104252832 A CN 104252832A CN 201310263064 A CN201310263064 A CN 201310263064A CN 104252832 A CN104252832 A CN 104252832A
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Abstract
The invention relates to an LED (light emitting diode) display panel. The LED display panel consists of a plurality of pixels, and each pixel comprises a light emitting diode, a display capacitor, a diode, a first electrode, a second electrode and a third electrode. LEDs are enabled to emit light by charging a capacitor in each pixel and forming capacitor discharge current by the LEDs in serial connection, and by selection of proper capacitance, operating voltage of a drive circuit can be increased, drive current is reduced, and burden of a drive power supply and line loss caused by large-current drive can be reduced.
Description
Technical field
The present invention relates to a kind of light emitting diode (LED) display panel.
Background technology
Light emitting diode (LED) display has jumbotron, high brightness display, fast response time, the advantage such as beautiful in colour, this makes it occupy indispensable one seat in oversize, indoor and outdoor field of display, but due to the problem of manufacturing process, inconsistency between LED unit is more serious, in order to solve inconsistence problems, independent control must be carried out to each LED unit, and correct, drive cost high; Because LED is low-voltage, high-current device, and big current is high to power requirement, and circuit loss is large.
For the above problem that current light-emitting diode display exists, the present invention relates to a kind of light emitting diode (LED) display panel and driving method thereof.The LED display panel that the present invention proposes is by the capacitor charging built-in to each pixel, then the LED of series connection is utilized to form capacitance discharge current to make LED luminous, by selecting suitable capacitance, the operating voltage of driving circuit can be improved, reduce drive current, reduce the line loss because large driven current density causes and the burden to driving power.Therefore because Ohmic contact internal resistance is different, LED manufacturing process causes inconsistently causes each LED luminance inconsistent, causes show uniformity poor.
Summary of the invention
The defect that the present invention seeks to exist for prior art provides a kind of LED display panel.
The present invention for achieving the above object, adopts following technical scheme:
A kind of LED display panel of the present invention, be made up of numerous pixels, each pixel comprises light emitting diode, display electric capacity, diode, the first electrode, the second electrode and the 3rd electrode, the one end wherein showing electric capacity is connected with one end of light emitting diode and diode respectively, another termination second electrode of display electric capacity, another termination first electrode of diode, another termination the 3rd electrode of light emitting diode, one end polarity that diode is connected with light emitting diode is contrary, and described light emitting diode (1) adopts gallium arsenide phosphide light emitting diode.
Preferably, the other end of the light emitting diode of all pixels links together and to be connected with the 3rd electrode.
A kind of LED display panel, be made up of numerous pixels, each pixel comprises light emitting diode, display electric capacity, diode, first electrode, second electrode, display switch pipe and the 3rd electrode, the one end wherein showing electric capacity is connected with one end of light emitting diode and diode respectively, another termination second electrode of display electric capacity, another termination first electrode of diode, other end serial connection display switch Guan Houyu the 3rd electrode of light emitting diode is connected, one end polarity that diode is connected with light emitting diode is contrary, described light emitting diode (1) adopts gallium arsenide phosphide light emitting diode.
The present invention has the following advantages:
1, the light-emitting diode display that the present invention proposes passes through the capacitor charging built-in to each pixel, then the LED of series connection is utilized to form capacitance discharge current to make LED luminous, by selecting suitable capacitance, the operating voltage of driving circuit can be improved, reduce drive current, reduce the line loss because large driven current density causes and the burden to driving power.
2, because Ohmic contact internal resistance is different, LED manufacturing process causes inconsistently causes each LED luminance inconsistent, causes show uniformity poor.And the light-emitting diode display that the present invention proposes due to the built-in electric capacity consistance of pixel better, discharge electricity amount is consistent, therefore effectively can solve the problem of non-uniform that LED itself causes.
3, conventional LED module is in order to solve homogeneity question, must control separately each pixel, therefore drives cost high, the present invention is by built-in capacitance charging/discharging function, the addressing of row, column crossed array can be realized, decrease driving way, reduce driving cost.
Accompanying drawing explanation
Accompanying drawing 1 is the base pixel structural representation of light-emitting diode display of the present invention;
Accompanying drawing 2 is the picture element array structure schematic diagram of light-emitting diode display of the present invention;
Accompanying drawing 3 is scanning of the present invention, addressing circuit schematic diagram;
Accompanying drawing 4 is the drive waveforms schematic diagram of display of the present invention;
Accompanying drawing 5 is the operating diagram of light-emitting diode display of the present invention;
Accompanying drawing 6 is the oscillogram of embodiments of the invention 1 and 2;
Accompanying drawing 7 is the oscillogram of embodiments of the invention 3 and 4.
Embodiment
The invention provides a kind of light emitting diode (LED) display panel and drive waveforms thereof, each pixel of this display panel comprises a unidirectional charge circuit be made up of diode 3 and display electric capacity 2, the electric discharge show circuit be made up of display electric capacity 2 and light emitting diode 1, relative to display electric capacity 2, the polarity of diode 3 and light emitting diode is contrary.Light emitting diode 1 luminescence is driven to realize display by carrying out charge and discharge to the display electric capacity 2 of each pixel.
The light-emitting diode display that the present invention proposes is by the capacitor charging built-in to each pixel, then the LED of series connection is utilized to form capacitance discharge current to make LED luminous, by selecting suitable capacitance, the operating voltage of driving circuit can be improved, reduce drive current, reduce the line loss because large driven current density causes and the burden to driving power.Therefore because Ohmic contact internal resistance is different, LED manufacturing process causes inconsistently causes each LED luminance inconsistent, cause show uniformity poor, and the present invention propose light-emitting diode display due to the electric capacity consistance that pixel is built-in better, discharge electricity amount is consistent, therefore effectively can solve the problem of non-uniform that LED itself causes, reduce the cost of drive system simultaneously.
Embodiment 1
A kind of LED display panel as shown in Figure 1, its each pixel 8 comprises first electrode 4, the display electric capacity 2 be connected with the first electrode 4, forms with the display diode 3 that is connected of electric capacity 2 and light emitting diode 1, the second electrode 5 be connected with diode 3, the 3rd electrode 7 that is connected with the other end of light emitting diode 1; Unidirectional charge circuit is formed by diode 3 and display electric capacity 2, electric discharge show circuit is formed by display electric capacity 2, light emitting diode 1, relative to display electric capacity 2, the polarity of diode 3 and light emitting diode 1 is contrary, as shown in Figure 1, also can change the polarity of diode 3 and light emitting diode 1 simultaneously.
Embodiment 2
A kind of LED display panel as shown in Figure 2, its each pixel 8 comprises first electrode 4, the display electric capacity 2 be connected with the first electrode 4, forms with the display diode 3 that is connected of electric capacity 2 and light emitting diode 1, the second electrode 5 of being connected with diode 3, it is characterized in that the other end of the light emitting diode 1 of all pixels links together and to be connected with the 3rd electrode 7; Relative to display electric capacity 2, the polarity of diode 3 and light emitting diode 1 is contrary, as shown in Figure 2, also can change the polarity of diode (3) and light emitting diode 1 simultaneously.
Embodiment 3
A kind of LED display panel as shown in Figure 3, its each pixel 8 comprises first electrode 4, the display electric capacity 2 be connected with the first electrode 4, forms with the display diode 3 that is connected of electric capacity 2 and light emitting diode 1, the second electrode 5 be connected with diode 3, the switching tube 6 be connected with the other end of light emitting diode 1, the 3rd electrode 7 that is connected with switching tube 6; Unidirectional charge circuit is formed by diode 3 and display electric capacity 2, electric discharge show circuit is formed by display electric capacity 2, light emitting diode 1 and display switch 6, relative to display electric capacity 2, the polarity of diode 3 and light emitting diode 1 is contrary, as shown in Figure 3, also can change the polarity of diode 3 and light emitting diode 1 simultaneously.
Embodiment 4
A kind of LED display panel as shown in Figure 4, its each pixel 8 comprises first electrode 4, the display electric capacity 2 be connected with the first electrode 4, forms with the display diode 3 that is connected of electric capacity 2 and light emitting diode 1, the second electrode 5 of being connected with diode 3, it is characterized in that the other end of the light emitting diode 1 of all pixels links together and display switch pipe 6, display switch pipe 6 is connected with the 3rd electrode 7; Relative to display electric capacity 2, the polarity of diode 3 and light emitting diode 1 is contrary, as shown in Figure 4, also can change the polarity of diode 3 and light emitting diode 1 simultaneously.
The working method of the light-emitting diode display described in embodiment 1 and 2 is as shown in accompanying drawing 5 and accompanying drawing 6, with the first electrode 4 for scan electrode, this scan electrode group is connected with row cutting module 10, and with the second electrode 5 for data electrode, this data electrode group is connected with row driver module 9; With the 3rd electrode 7 for show electrode, this electrode voltage is Vb1; Row, column driver module produces line scan signals as shown in 4 kinds, accompanying drawing and column data signal under the driving of the control signals such as data, shift clock, direction of displacement, latches data; Bias voltage and the pulse voltage of scan electrode are respectively Vb1, Vs1, and bias voltage and the pulse voltage of data electrode are respectively Vb2, Vs2; Vb1 is more than or equal to Vs2, and Vs2 is greater than Vs1, the cut-in voltage Vd3 of diode 3 and the cut-in voltage Vd1 sum of light emitting diode 1, and Vs1 is more than or equal to Vb2; When this display unit is addressed, first electrode 4 applies the negative-going pulse based on bias voltage Vb1, if this pixel is bright spot, then the second electrode 5 applies simultaneously the direct impulse based on bias voltage Vb2, now terminal 5 level Vs2 is greater than terminal 4 level Vs1, and driving circuit is charged to display electric capacity 2 by diode 3, and the pressure reduction at charging voltage and electric capacity two ends cancels each other, charging current drops to 0, and electric capacity 2 two ends pressure reduction reaches-(Vs2-Vd3); If this pixel is dim spot, then terminal 5 maintains bias voltage Vb2 level, now terminal 5 level Vb2 is less than or equal to terminal 4 level Vs1, and diode 3 is in cut-off state, and driving circuit does not charge to electric capacity 2, and electric capacity 2 two ends pressure reduction is 0.After this pixel 8 addressing completes, the level on terminal 4 and 5 reverts to Vb1 and Vb2, and now diode 3 is in reverse blocking state, and electric capacity 2 maintains pressure reduction; If electric capacity 2 two ends pressure reduction is-(Vs2-Vd3) that be greater than the unblocked level Vd1 of light emitting diode 1, electric capacity 2 is discharged by light emitting diode 1, light emitting diode 1 forward conduction is luminous; If electric capacity 2 two ends pressure reduction is less than the unblocked level Vd1 of light emitting diode 1, light emitting diode 1 is in the dark state of cut-off.
The working method of the light-emitting diode display described in embodiment 3 and 4 is as shown in accompanying drawing 5 and accompanying drawing 7, with the first electrode 4 for scan electrode, this scan electrode group is connected with row cutting module 10, and with the second electrode 5 for data electrode, this data electrode group is connected with row driver module 9; With the 3rd electrode 7 for show electrode, this electrode voltage is Vb1; Row, column driver module produces line scan signals as shown in 4 kinds, accompanying drawing and column data signal under the driving of the control signals such as data, shift clock, direction of displacement, latches data; Bias voltage and the pulse voltage of scan electrode are respectively Vb1, Vs1, and bias voltage and the pulse voltage of data electrode are respectively Vb2, Vs2; Vb1 is more than or equal to Vs2, and Vs2 is greater than Vs1, the cut-in voltage Vd3 of diode 3 and the cut-in voltage Vd1 sum of light emitting diode 1, and Vs1 is more than or equal to Vb2; When this display unit is addressed, first electrode 4 applies the negative-going pulse based on bias voltage Vb1, if this pixel is bright spot, then the second electrode 5 applies simultaneously the direct impulse based on bias voltage Vb2, now terminal 5 level Vs2 is greater than terminal 4 level Vs1, and driving circuit is charged to display electric capacity 2 by diode 3, and the pressure reduction at charging voltage and electric capacity two ends cancels each other, charging current drops to 0, and electric capacity 2 two ends pressure reduction reaches-(Vs2-Vd3); If this pixel is dim spot, then terminal 5 maintains bias voltage Vb2 level, now terminal 5 level Vb2 is less than or equal to terminal 4 level Vs1, and diode 3 is in cut-off state, and driving circuit does not charge to electric capacity 2, and electric capacity 2 two ends pressure reduction is 0.After this pixel 8 addressing completes, the level on terminal 4 and 5 reverts to Vb1 and Vb2, and now diode 3 is in reverse blocking state, and electric capacity 2 maintains pressure reduction; Now open display switch 6, if electric capacity 2 two ends pressure reduction is-(Vs2-Vd3) that be greater than the unblocked level Vd1 of light emitting diode 1, electric capacity 2 is discharged by light emitting diode 1, light emitting diode 1 forward conduction is luminous; If electric capacity 2 two ends pressure reduction is less than the unblocked level Vd1 of light emitting diode 1, light emitting diode 1 is in the dark state of cut-off.
Claims (3)
1. a LED display panel, be made up of numerous pixels, it is characterized in that each pixel (8) comprises light emitting diode (1), display electric capacity (2), diode (3), first electrode (4), second electrode (5) and the 3rd electrode (7), the one end wherein showing electric capacity (2) is connected with one end of light emitting diode (1) and diode (3) respectively, another termination second electrode (5) of display electric capacity (2), another termination first electrode (4) of diode (3), another termination the 3rd electrode (7) of light emitting diode (1), one end polarity that diode (3) is connected with light emitting diode (1) is contrary, described light emitting diode (1) adopts gallium arsenide phosphide light emitting diode.
2. a kind of LED display panel according to claim 1, is characterized in that the other end of the light emitting diode (1) of all pixels links together and to be connected with the 3rd electrode (7).
3. a LED display panel, be made up of numerous pixels, it is characterized in that each pixel (8) comprises light emitting diode (1), display electric capacity (2), diode (3), first electrode (4), second electrode (5), display switch pipe (6) and the 3rd electrode (7), the one end wherein showing electric capacity (2) is connected with one end of light emitting diode (1) and diode (3) respectively, another termination second electrode (5) of display electric capacity (2), another termination first electrode (4) of diode (3), other end serial connection display switch pipe (6) of light emitting diode (1) is connected with the 3rd electrode (7) afterwards, one end polarity that diode (3) is connected with light emitting diode (1) is contrary, described light emitting diode (1) adopts gallium arsenide phosphide light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310263064.6A CN104252832A (en) | 2013-06-27 | 2013-06-27 | LED (light emitting diode) display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310263064.6A CN104252832A (en) | 2013-06-27 | 2013-06-27 | LED (light emitting diode) display panel |
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| CN104252832A true CN104252832A (en) | 2014-12-31 |
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| CN201310263064.6A Pending CN104252832A (en) | 2013-06-27 | 2013-06-27 | LED (light emitting diode) display panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382243A (en) * | 2020-11-16 | 2021-02-19 | 成都中电熊猫显示科技有限公司 | Driving circuit and method, backlight plate and display device |
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2013
- 2013-06-27 CN CN201310263064.6A patent/CN104252832A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382243A (en) * | 2020-11-16 | 2021-02-19 | 成都中电熊猫显示科技有限公司 | Driving circuit and method, backlight plate and display device |
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Application publication date: 20141231 |