CN104934003B - Source driving system and use its display device - Google Patents
Source driving system and use its display device Download PDFInfo
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- CN104934003B CN104934003B CN201510363328.4A CN201510363328A CN104934003B CN 104934003 B CN104934003 B CN 104934003B CN 201510363328 A CN201510363328 A CN 201510363328A CN 104934003 B CN104934003 B CN 104934003B
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Abstract
The present invention discloses a kind of source driving system, and it includes multiple terminal resistances, multiple source driving chips and at least one buffer cell.Multiple terminal resistances are separately positioned between the electrode line of each pair differential lines and negative line, for video current signal to be converted into voltage differential signal.The input of each source driving chip is connected with terminal resistance, with receiving voltage differential signal, so as to export source electrode driving voltage according to voltage differential signal.The voltage differential signal of the reception of the input of previous source driving chip is copied as corresponding current difference signal by buffer cell, and is exported to the corresponding terminal resistance of input of latter source driving chip.The present invention also provides a kind of display device.Voltage differential signal is copied as corresponding current difference signal by the source driving system and display device of the present invention using buffer cell, it is to avoid because the video current signal of input flows to the abnormal risk of picture display caused by multiple source driving chips.
Description
Technical field
The present invention relates to actuation techniques field, more particularly to a kind of source driving system and its display device is used.
Background technology
Liquid crystal display (Liquid Crystal Display, LCD) has good image quality, small volume, lightweight, low driving
Voltage, low-power consumption, it is radiationless the advantages of, occupied an leading position at present in flat display field, have been widely used desktop computer,
Palmtop computer, personal digital assistant (Personal Digital Assistant, PDA), portable phone, TV and many
Plant in office automation and audio-visual equipment.
By taking thin film transistor (TFT) (Thin Film Transistor, TFT) liquid crystal display device as an example, it includes liquid crystal display
Panel and drive system, wherein, liquid crystal display panel includes a plurality of gate line and a plurality of data lines, and two adjacent gate lines
A pixel cell is intersected to form with two adjacent data lines, each pixel cell at least includes a thin film transistor (TFT), and
Drive system includes raster data model system and source driving system.With the producer's chasing after to the cost degradation of liquid crystal display device
Ask and manufacturing process raising, the drive system integrated chip beyond liquid crystal display panel is arranged at originally and is arranged at liquid crystal
Become possibility on the glass substrate of display panel, for example, raster data model integrated system is arranged at into array base palte (Gate IC
In Array, GIA) on, the manufacturing process of liquid crystal display device can be simplified, and reduce production cost.
The basic functional principle of liquid crystal display panel and drive system is：Raster data model system with gate line by electrically connecting
Pulling up transistor for connecing send out gate drive signal to gate line, sequentially opens the TFT of every a line, then by source drive system
The pixel cell of one full line is charged to each required voltage by system simultaneously, to show different GTGs.I.e. first by the first row
Raster data model system pulled up transistor by it and open the thin film transistor (TFT) of the first row, then by source driving system to the
The pixel cell of a line is charged.When the pixel cell of the first row is charged, raster data model system is just by the row film crystal
Pipe is closed, and then the raster data model system of the second row is pulled up transistor by it and opens the thin film transistor (TFT) of the second row, then by
Source driving system charges to the pixel cell of the second row.So sequentially go down, when the pixel list of last column of having substituted the bad for the good
Member, is just started to charge up from the first row again.
Because source driving system is to change the orientation of liquid crystal molecule using different voltage is exported, then through every
The different printing opacity degree of the individual pixel GTG different to constitute picture, therefore display of new generation is when resolution ratio, brightness are with reaction
Between while continue to optimize, source driving system be also required to higher frequency and higher voltage could meet high scan frequency with it is quick more
New demand, and the number of chips of source driving system will also be improved according to demand.
Fig. 1 is the module diagram of the display device of an embodiment of prior art.As shown in figure 1, existing display
The source driving system of device generally includes multiple source driving chips (two are only shown in Fig. 1).As shown in figure 1, display
Device includes main circuit board, driving plate, multiple flexible PCBs, the first source driving chip and the second source driving chip.Its
In, multipair differential lines are provided with driving plate.Each pair differential lines include electrode line P and negative line N.On main circuit board and driving plate
Differential lines by connector realize electrically connect, each pair differential lines by multiple flexible PCBs respectively with multiple source drive cores
The input of piece is connected.Wherein, dotted line represents to drive the cabling of back.In order to avoid differential signal such as video current signal
In transmission, because signal (particularly high-frequency signal) can form stronger back wave in transmission line in terminal, this reflection
The transmission direction of ripple and original signal it is in opposite direction, therefore the signal of transmission-wire terminal is the folded of original signal and this reflected signal
Plus, therefore, need to set a terminal resistance R on the corresponding transmission-wire terminal of the second source driving chip, to pass through terminal resistance R
The characteristic impedance on match circuit printed line road, minimizes reflected signal, so that original signal transmission quality is optimal.While terminal
Current signal is also changed into voltage signal by resistance R.But because the first source driving chip is away from terminal resistance R, therefore, first
Source driving chip readily receive due to differential signal the first source driving chip and the second source driving chip cabling it
Between reflection and in the back wave of transmission-wire terminal formation, so as to cause the display of display device picture abnormal.
Fig. 2 is the module diagram of the display device of another embodiment of prior art.The source electrode of existing display device
Drive system generally includes multiple source driving chips (two are only shown in Fig. 2).As shown in Fig. 2 display device includes master
Circuit board, driving plate, multiple flexible PCBs and multiple source driving chips, wherein, multipair differential lines are provided with driving plate.
Each pair differential lines include electrode line P and negative line N.Main circuit board is realized by connector with the differential lines in driving plate and is electrically connected
Connect, input of each pair differential lines by multiple flexible PCBs respectively with multiple source driving chips is connected.Wherein, dotted line table
Show the cabling of driving back.From unlike a upper embodiment (referring to Fig. 1) for prior art, in order to avoid difference believe
Number such as video current signal is in transmission, due to high speed signal in transmission line in terminal formation back wave, the former letter of interference
Number, it is both needed to set a terminal resistance R in the differential lines of the input of each source driving chip.However, due to existing source
Pole drive system includes multiple source driving chips, and the video current signal of input source driving system can flow to multiple source electrodes and drive
Dynamic chip, therefore, the electric current for the differential signal that each source driving chip is received will reduce, and so may result in the source electrode of output
Driving voltage is reduced, so as to cause picture display abnormal.
Therefore, it is necessary to provide improved technical scheme to overcome above technical problem present in prior art.
The content of the invention
The main technical problem to be solved in the present invention is to provide a kind of source electrode of the source drive voltage of energy output HIGH voltage
Drive system.
The present invention discloses a kind of source driving system, for exporting source electrode driving voltage, to drive display panel to show not
Same GTG, the source driving system includes multiple terminal resistances, multiple source driving chips and at least one buffer cell；Institute
State multiple terminal resistances to be separately positioned between the electrode line of each pair differential lines and negative line, for video current signal to be changed
For voltage differential signal；The input of each source driving chip is connected with the terminal resistance, to receive the voltage
Differential signal, so as to export the source drive voltage according to the voltage differential signal；At least one buffer cell position
Between the input of two adjacent source driving chips, for by the input of the previous source driving chip
The voltage differential signal received copies as corresponding current difference signal, and exports to the latter source driving chip
The corresponding terminal resistance of input.
Preferably, the buffer cell is arranged on the inside of the source driving chip.
Preferably, the number of the terminal resistance is identical with the number of the source class driving chip, the source drive core
The number of piece is 1 with the difference of the number of the buffer cell.
Preferably, each source driving chip corresponds to differential lines described in a pair.
The present invention also provides a kind of display device, and the display device includes above-mentioned source driving system.
Preferably, the display device also includes main circuit board, driving plate, multiple flexible PCBs；The main circuit board
For exporting the video current signal；The multipair differential lines, the differential lines and the master are provided with the driving plate
Circuit board is connected, to receive the video current signal of the main circuit board output；The multiple flexible PCB distinguishes position
Between the input and the terminal resistance of the source driving chip, for the voltage differential signal to be transmitted to described
Multiple source driving chips.
Preferably, the multiple terminal resistance is arranged in the driving plate.
Preferably, the driving plate is printed circuit board (PCB).
Preferably, the display device also includes display panel, and the display panel is connected with the source driving system,
To receive the source drive voltage, so as to show different GTGs.
The source driving system and display device of the present invention is copied as voltage differential signal accordingly using buffer cell
Current difference signal, it is to avoid flow to multiple source driving chips due to inputting the video current signal of source driving system and lead
The problem of electric current for the differential signal that each source driving chip caused is received reduces, so that each source driving chip output
Source drive voltage will not reduce, and then avoid the abnormal risk of picture display.
Brief description of the drawings
Below in conjunction with accompanying drawing, the embodiment to the present invention is described in detail.
Fig. 1 is the module diagram of the display device of the embodiment of prior art one.
Fig. 2 is the module diagram of the display device of another embodiment of prior art.
Fig. 3 is the structural representation of the source driving system of one embodiment of the invention.
Fig. 4 is the circuit theory schematic diagram of the buffer cell of one embodiment of the invention.
Fig. 5 a are the input terminal voltage waveform diagram of the buffer cell of one embodiment of the invention.
Fig. 5 b are the output end current waveform diagram of the buffer cell of one embodiment of the invention.
Fig. 6 is the module diagram of the display device of one embodiment of the invention.
Embodiment
To enable the above objects, features and advantages of the present invention more obvious understandable, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
Fig. 3 is the structural representation of the source driving system of one embodiment of the invention.Source driving system is used for output source
Pole driving voltage, to drive display panel to show different GTGs.Referring to Fig. 3, source driving system include multiple terminal resistances,
Multiple source driving chips and at least one buffer cell U1.
In an embodiment of the present invention, terminal resistance R number is identical with the number of source driving chip, source drive
The number of chip is 1 with the difference of buffer cell U1 number.
Two terminal resistances (first terminal resistance R1, second terminal resistance R2), two are included with source driving system below
Illustrated exemplified by individual source driving chip (the first source driving chip 101, the second source driving chip 102).
First source driving chip 101 includes first input end 1011, the first internal logic circuit 1012.Second source electrode drives
Dynamic chip 102 includes the second input 1021, the second internal logic circuit 1022.
First terminal resistance R1 and second terminal resistance R2 is separately positioned on the first input of the first source driving chip 101
Hold 1011 corresponding differential lines electrode line N and negative line P and the second source driving chip 102 the second input 1021 it is corresponding
Differential lines electrode line N and negative line P between.The source electrode of first input end 1011 and second of first source driving chip 101
Second input 1021 of driving chip 102 is connected with first terminal resistance R1, second terminal resistance R2 respectively, that is to say, that
The first input end 1011 of the 101 of first source driving chip is connected with first terminal resistance R1 two ends, the second source drive
Second input 1012 of chip 102 is connected with second terminal resistance R2 two ends.Certain those skilled in the art can manage
Solution, the second input of the source driving chip 102 of first input end 1011 and second of the first source driving chip 101
1021 pass through link block such as flexible PCB (not shown in Fig. 3, refer to Fig. 6) and first terminal resistance R1, the respectively
Two terminal resistance R2 are connected.
Buffer cell U1 is located at i.e. the first source driving chip 101 between the input of two adjacent source driving chips
The source driving chip 102 of first input end 1011 and second the second input 1021 between.
Specifically, the corresponding differential lines of first terminal resistance R1 receive main circuit board (not shown in Fig. 3, refer to Fig. 6)
Video current signal is converted to voltage differential signal by the video current signal of output, first terminal resistance R1.Buffer cell U1
For by the voltage difference of the previous source driving chip such as reception of the first input end 1011 of the first source driving chip 101
Sub-signal copies as corresponding current difference signal, and current difference signal is exported to latter source driving chip such as
The second input 1021 corresponding second terminal resistance R2, second terminal resistance R2 of two source driving chips 102 are by difference between current
Sub-signal is converted to corresponding voltage differential signal.
The voltage differential signal that first internal logic circuit 1012 is received according to first input end 1011 exports the first source electrode
Driving voltage, the voltage differential signal that the second internal logic circuit 1022 is received according to the second input 1021 exports the second source electrode
Driving voltage.
Wherein, buffer cell U1 is arranged on the inside of the first source driving chip 101, and certain those skilled in the art can
With understanding, buffer cell U1 can be also arranged on to the inside of the second source driving chip 102 or positioned at the first source drive
The outside of the source driving chip 102 of chip 101 and second is for example in driving plate 300 (not shown in Fig. 3, refer to Fig. 6).
Wherein, first terminal resistance R1 and/or second terminal resistance R2 are arranged on the interior of the first source driving chip 101
Portion, certainly it will be appreciated by those skilled in the art that, first terminal resistance R1 and/or second terminal resistance R2 can also be set
Put in the inside of the second source driving chip 102 or positioned at the first source driving chip 101 and the second source driving chip 102
Outside is for example in driving plate 300 (not shown in Fig. 3, refer to Fig. 6).
First terminal resistance is respectively arranged with each source driving chip 101, the terminal of 102 corresponding each pair differential lines
R1, second terminal resistance R1.The video current signal that main circuit board 400 is exported is converted into voltage differential by first terminal resistance R1
The first terminal resistance R1 voltage differential signals changed are copied as corresponding current difference signal by signal, buffer cell U1, and
Current difference signal is exported to the corresponding second terminal resistance R2 of the second input 1021 of the second source driving chip 102,
Make it that current difference signal is converted to corresponding voltage differential signal by second terminal resistance R2, so that each source electrode drives
The dynamic difference of chip 101,102 receiving voltage differential signal, to export source electrode driving voltage according to voltage differential signal, and then causes
Display panel receives source drive voltage, to show different GTGs, it is to avoid due to inputting the video current of source driving system
What the electric current that signal flows to the differential signal that each source driving chip is received caused by multiple source driving chips reduced
Problem so that the source drive voltage of each source driving chip output will not be reduced, and then avoid picture display exception
Risk.
Fig. 4 is the buffer cell U1 of one embodiment of the invention circuit theory schematic diagram, and buffer cell U1 includes input
And output end.Fig. 5 a are the input terminal voltage waveform diagram of the buffer cell of one embodiment of the invention.Fig. 5 b are the present invention one
The output end current waveform diagram of the buffer cell of embodiment.Used please refer to Fig. 4, Fig. 5 a and Fig. 5 b, buffer cell U1
The output of waveform identical current signal is copied as in the voltage signal for being inputted end.
Fig. 6 is the module diagram of the display device of one embodiment of the invention.As shown in fig. 6, display device includes such as Fig. 3
Shown source driving system, multiple flexible PCBs 200, driving plate 300, main circuit board 400 and display panel (does not show in figure
Go out).Wherein, main circuit board 400 is used to export video current signal, and source driving system is according to video current signal output source electrode
Drive signal is to display panel, to drive display panel to show different GTGs.
Wherein, source driving system (only shows the first source driving chip including multiple source driving chips in figure
101st, the second source driving chip 102, the number of source driving chip is not limited to 2), multiple terminal resistances (only show in figure
Go out first terminal resistance R1, second terminal resistance R2, the number of terminal resistance is not limited to 2).It is provided with driving plate 300 many
To differential lines (only showing two pairs in figure, the number of differential lines is not limited to two pairs), each pair differential lines include electrode line N, born
Polar curve P, bridging is provided with terminal resistance and (first is only shown in Fig. 6 respectively between the electrode line N and negative line P of each pair differential lines
Terminal resistance R1, second terminal resistance R2).One end of each pair differential lines in driving plate 300 passes through a flexible circuit respectively
Plate 200 realizes electricity with source driving chip (the first source driving chip 101, the second source driving chip 102 are only shown in Fig. 6)
The other end of each pair differential lines in connection, driving plate 300 is realized by connector with main circuit board 400 and electrically connected.
In an embodiment of the present invention, first terminal resistance R1, second terminal resistance R2 are arranged at driving plate 300
On.
In an embodiment of the present invention, driving plate 300 is printed circuit board (PCB).
The source driving system and display device of the present invention is copied as voltage differential signal accordingly using buffer cell U1
Current difference signal, it is to avoid due to input the video current signal of source driving system flow to multiple source driving chips and
The problem of electric current for the differential signal that caused each source driving chip is received reduces so that each source driving chip is defeated
The source drive voltage gone out will not be reduced, and then avoid the abnormal risk of picture display.
Specific case is applied in the present invention to the source driving system of the present invention and principle and the embodiment party of display device
Formula is set forth, and the explanation of embodiment of above is only intended to help and understands the method for the present invention and its core concept；Meanwhile,
For those of ordinary skill in the art, according to the thought of the present invention, have change in specific embodiments and applications
Become part, to sum up, this specification content should not be construed as limiting the invention.
Claims (9)
1. a kind of source driving system, for receiving a video current signal, and it is multiple according to the video current signal output
Source drive voltage, to drive display panel to show different GTGs, it is characterised in that the source driving system includes：
Multiple terminal resistances, are separately positioned between the electrode line of each pair differential lines and negative line, for by video current signal
Be converted to voltage differential signal；
Multiple source driving chips, the input of each source driving chip is connected with the terminal resistance, to receive
Voltage differential signal is stated, so as to export the source drive voltage according to the voltage differential signal；And
At least one buffer cell, between the input of two adjacent source driving chips, for will be previous
The voltage differential signal that the input of the source driving chip is received copies as corresponding current difference signal, and exports
To the corresponding terminal resistance of input of the latter source driving chip.
2. source driving system as claimed in claim 1, it is characterised in that the buffer cell is arranged on the source drive
The inside of chip.
3. source driving system as claimed in claim 1, it is characterised in that the number of the terminal resistance is driven with the source electrode
The number of dynamic chip is identical, and the number of the source driving chip is 1 with the difference of the number of the buffer cell.
4. source driving system as claimed in claim 1, it is characterised in that each a pair of institutes of source driving chip correspondence
State differential lines.
5. a kind of display device, it is characterised in that including the source driving system as described in Claims 1-4 any one.
6. display device as claimed in claim 5, it is characterised in that the display device also includes：
Main circuit board, the main circuit board is used to export the video current signal；
The multipair differential lines are provided with driving plate, the driving plate, the differential lines are connected with the main circuit board, to connect
Receive the video current signal of the main circuit board output；And
Multiple flexible PCBs, respectively between the input and the terminal resistance of the source driving chip, for inciting somebody to action
The voltage differential signal is transmitted to the multiple source driving chip.
7. display device as claimed in claim 6, it is characterised in that the multiple terminal resistance is arranged at the driving plate
On.
8. display device as claimed in claim 6, it is characterised in that the driving plate is printed circuit board (PCB).
9. display device as claimed in claim 6, it is characterised in that the display device also includes display panel, described aobvious
Show that panel is connected with the source driving system, to receive the source drive voltage, so as to show different GTGs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510363328.4A CN104934003B (en) | 2015-06-26 | 2015-06-26 | Source driving system and use its display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510363328.4A CN104934003B (en) | 2015-06-26 | 2015-06-26 | Source driving system and use its display device |
Publications (2)
| Publication Number | Publication Date |
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| CN104934003A CN104934003A (en) | 2015-09-23 |
| CN104934003B true CN104934003B (en) | 2017-07-18 |
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| CN201510363328.4A Active CN104934003B (en) | 2015-06-26 | 2015-06-26 | Source driving system and use its display device |
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| CN107832245B (en) * | 2017-11-10 | 2021-08-06 | 维沃移动通信有限公司 | Output impedance adjusting method, chip and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5872561A (en) * | 1997-03-31 | 1999-02-16 | Allen-Bradley Company, Llc | Fast scanning switch matrix |
| JP2002232271A (en) * | 2001-02-01 | 2002-08-16 | Fujitsu Ltd | Dc offset cancel circuit, optic/electric pulse converting circuit and pulse shaping circuit |
| KR20100079189A (en) * | 2008-12-30 | 2010-07-08 | 주식회사 동부하이텍 | Differential signaling serial interface circuit |
| CN101847378B (en) * | 2009-03-27 | 2012-07-04 | 北京京东方光电科技有限公司 | Source driving chip |
| KR101129242B1 (en) * | 2010-05-18 | 2012-03-26 | 주식회사 실리콘웍스 | Liquid crystal display device using chip on glass method |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |
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