CN103268746B - A kind of pixel-driving circuit, light emitting diode (LED) display screen and display device - Google Patents

A kind of pixel-driving circuit, light emitting diode (LED) display screen and display device Download PDF

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Publication number
CN103268746B
CN103268746B CN201210526418.7A CN201210526418A CN103268746B CN 103268746 B CN103268746 B CN 103268746B CN 201210526418 A CN201210526418 A CN 201210526418A CN 103268746 B CN103268746 B CN 103268746B
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pixel
driving circuit
line
electric power
power connection
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CN103268746A (en
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郭峰
赵本刚
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Guangdong Juhua Printing Display Technology Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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Abstract

The invention discloses a kind of pixel-driving circuit, light emitting diode (LED) display screen and display device, relate to Display Technique, electric power connection line it is additionally arranged in pixel-driving circuit, adjacent two piece power line is connected in the central area of pixel-driving circuit, so that the equiva lent impedance of adjacent two power lines is parallel relationship, reduce the impedance of entirety, improve the display brightness of pixel-driving circuit central area.

Description

A kind of pixel-driving circuit, light emitting diode (LED) display screen and display device
Technical field
The present invention relates to Display Technique, particularly relate to a kind of pixel-driving circuit, light emitting diode (LED) display screen and display device.
Background technology
At present, the wide application that diode (OLED) display screen obtains, in diode (OLED) display screen, pixel-driving circuit realize the display of each pixel.
As it is shown in figure 1, pixel-driving circuit includes: power line 101 and pixel cell 102, power line 101 power for each pixel cell 102.
The inventors found that, owing to power line 101 self exists impedance, make the equivalent circuit of this pixel-driving circuit as shown in Figure 2, each pixel cell 102 is equivalent to exist the equivalent resistance R of a power line, so, the magnitude of voltage that each pixel cell 102 obtains is the magnitude of voltage after the magnitude of voltage that previous pixel cell obtains deducts equivalent resistance R dividing potential drop, thus cause the region voltage deficiency at pixel-driving circuit center, its display effect is as shown in Figure 3, the brightness that its central area visible shows is less, causes overall display effect the best.
Summary of the invention
The embodiment of the present invention provides a kind of pixel-driving circuit, light emitting diode (LED) display screen and display device, to realize improving the display brightness of pixel-driving circuit central area.
A kind of pixel-driving circuit, including: pixel cell, at least two for the power line powered for described pixel cell, also include:
At least electric power connection line, described electric power connection line, in the region set, connects adjacent two piece power line;The scope of described setting regions is gradually reduced to pixel-driving circuit edge from pixel-driving circuit center.
Further, described setting regions is symmetrical according to symmetrical and according to pixel-driving circuit the lower edges midpoint line of left and right edges midpoint line of pixel-driving circuit, and the scope of described setting regions is gradually reduced to axis of symmetry end points from axis of symmetry midpoint.
Further, described setting regions be shaped as rhombus.
Further, the described rhombus length of side particularly as follows:
Wherein, D1For the left and right edges length of pixel-driving circuit, D2Lower edges length for pixel-driving circuit.
It is also preferred that the left in the pixel cell of setting regions at least one described, when connecting adjacent two piece power line, described electric power connection line is setting the edge of pixel cell or between two adjacent pixel cells, connects adjacent two piece power line.
It is also preferred that the left the material of described electric power connection line is identical with described power line.
Or, the conductive capability of the material of described electric power connection line is more than the conductive capability of the material of described power line.
A kind of light emitting diode (LED) display screen, the pixel-driving circuit provided including the embodiment of the present invention.
A kind of display device, the light emitting diode (LED) display screen provided including the embodiment of the present invention.
The embodiment of the present invention provides a kind of pixel-driving circuit, light emitting diode (LED) display screen and display device, electric power connection line it is additionally arranged in pixel-driving circuit, adjacent two piece power line is connected in the central area of pixel-driving circuit, so that the equiva lent impedance of adjacent two power lines is parallel relationship, reduce the impedance of entirety, improve the display brightness of pixel-driving circuit central area.
Accompanying drawing explanation
Fig. 1 is pixel-driving circuit structural representation in prior art;
Fig. 2 is pixel-driving circuit equiva lent impedance structural representation in prior art;
Fig. 3 is pixel-driving circuit display effect schematic diagram in prior art;
The pixel-driving circuit structural representation that Fig. 4 provides for the embodiment of the present invention;
The setting regions schematic shapes that Fig. 5 a and Fig. 5 b provides for the embodiment of the present invention;
The electric power connection line that Fig. 5 c-Fig. 5 k provides for the embodiment of the present invention arranges schematic diagram;
The one preferably setting regions schematic diagram that Fig. 6 provides for the embodiment of the present invention;
The pixel-driving circuit equiva lent impedance structural representation that Fig. 7 provides for the embodiment of the present invention;
The pixel-driving circuit display effect schematic diagram that Fig. 8 provides for the embodiment of the present invention;
The more specific electric power connection line that Fig. 9 a-Fig. 9 d provides for the embodiment of the present invention arranges schematic diagram.
Detailed description of the invention
The embodiment of the present invention provides a kind of pixel-driving circuit, light emitting diode (LED) display screen and display device, electric power connection line it is additionally arranged in pixel-driving circuit, adjacent two piece power line is connected in the central area of pixel-driving circuit, so that the equiva lent impedance of adjacent two power lines is parallel relationship, reduce the impedance of entirety, improve the display brightness of pixel-driving circuit central area.
As shown in Figure 4, the pixel-driving circuit that the embodiment of the present invention provides, including: pixel cell 402, at least two, for the power line 401 for pixel cell 402 power supply, also includes:
At least electric power connection line 403, electric power connection line 403, in the region 404 set, connects adjacent two piece power line 401;The scope of setting regions 404 is gradually reduced to pixel-driving circuit edge from pixel-driving circuit center.
Owing to being connected to adjacent two piece power line by electric power connection line 403, from the point of view of the pixel cell after this electric power connection line, its equiva lent impedance has carried out parallel connection, overall equiva lent impedance reduces, the voltage that pixel cell is got increases, improve the display brightness of this pixel cell, owing to electric power connection line 403 is arranged in setting regions, so the display brightness of setting regions is improved, and the scope of setting regions 404 is gradually reduced to pixel-driving circuit edge from pixel-driving circuit center, therefore, mainly improve the display brightness of pixel-driving circuit central area, and then obtain preferably display effect.
Generally, owing to the characteristics such as the material of power line 401, thickness are typically identical, so the shape in the less region of pixel-driving circuit center display brightness is symmetrical, therefore, in order to preferably improve the display brightness of pixel-driving circuit central area, setting regions 404 is it can also be provided that the shape of symmetry, thus is effectively improved the display brightness of pixel-driving circuit central area.
Now, setting regions is symmetrical according to symmetrical and according to pixel-driving circuit the lower edges midpoint line of left and right edges midpoint line of pixel-driving circuit, and the scope of setting regions is gradually reduced to axis of symmetry end points from axis of symmetry midpoint.As shown in Fig. 5 a, 5b, the setting of the setting regions shown in Fig. 5 a, 5b is satisfied by symmetrical requirements, can effectively increase the display brightness of pixel-driving circuit central area, and then obtain preferably display effect.
Owing to the change of power line impedance is generally according to the length change in direct ratio of power line, so, setting regions to be shaped as rhombus preferable, the length of side of rhombus can be set flexibly according to practical situation, when the rhombus length of side particularly as follows:Time, as shown in Figure 6, this set-up mode goes for various pixel-driving circuit, wherein, D to the shape of setting regions1For the left and right edges length of pixel-driving circuit, D2Lower edges length for pixel-driving circuit.
Embodiment one,
Electric power connection line is gradually increased from both sides toward middle data, and adjacent rows electric power connection line difference number is equal, and spacing is equal, and every a line electric power connection line is continuous, and described setting regions can be multiple figure.
Electric power connection line in this embodiment is distributed as shown in Figure 6, comprise as a example by nine row electric power connection lines by described setting regions, every a line electric power connection line is continuous print, the first row includes an electric power connection line, second row includes three electric power connection lines, the third line includes that the electric power connection line data that five electric power connection lines, middle a line or two middle row include are most, and described setting regions assumes diamond in shape.In described setting regions, being gradually incremented by from both sides toward middle electric power connection line number, and the difference of two adjacent row electric power connection line numbers is equal, in this embodiment, two adjacent row electric power connection line difference numbers are 2.
Meanwhile, in this embodiment, the adjacent spacing between two row electric power connection lines is identical, now, is easier to determine the equivalent resistance of power line.
Such as, can be with the corresponding electric power connection line of each pixel cell, for the ease of arranging electric power connection line in pixel-driving circuit, electric power connection line can be arranged on and set the edge of pixel cell or between two adjacent pixel cells, that is: at least one pixel cell of setting regions, when connecting two adjacent power lines, electric power connection line is setting the edge of pixel cell or between two adjacent pixel cells, connect two adjacent power lines, now, the rectangle frame that each power line and electric power connection line surround includes a pixel cell.
Certainly, those skilled in the art can also arrange electric power connection line in other position of pixel-driving circuit, as long as meeting electric power connection line in setting regions, and electric power connection line connects two adjacent power lines.
Now, in pixel-driving circuit, the equivalent circuit of power line is as it is shown in fig. 7, owing to each equivalent resistance is parallel relationship, so R1drop=R, R2drop=R/2, R3drop=R/4, ..., equiva lent impedance is reduced, voltage obtained by the pixel cell of pixel-driving circuit central area and the voltage difference obtained by other regions reduce, its difference in brightness also reduces, and then improve the display brightness of pixel-driving circuit central area, it is thus achieved that preferably display effect.
In this embodiment, two adjacent row electric power connection line difference numbers are 2, and the electric power connection line differed in other embodiments of the invention can be n root, and n is natural number.
In the present embodiment, described setting regions is rhombus, and in other embodiments of the invention, described setting regions can be other shape, as shown in Fig. 5 a, Fig. 5 b.Described setting regions can also is that the asymmetric region of upper and lower two parts.
Certainly, those skilled in the art can also arrange the shapes and sizes of setting regions, and then the effective display brightness improving the region needing increase brightness in pixel-driving circuit flexibly according to practical situation so that display effect is more preferably.
Embodiment two,
Electric power connection line is gradually increased from both sides toward middle data, and adjacent rows electric power connection line difference number is unequal, and spacing is equal, and every a line electric power connection line is continuous, and described setting regions can be multiple figure.
Embodiment two is with the difference of embodiment one, and in described setting regions, the difference of two adjacent row electric power connection line numbers is unequal.
Fig. 5 d and Fig. 5 e is the unequal situation of numerical value of two adjacent row electric power connection line differences.
As fig 5d, described setting regions is oval, and including nine row electric power connection lines, the first row includes an electric power connection line, second row includes an electric power connection line, the third line includes two electric power connection lines, and fourth line includes three electric power connection lines, and fifth line includes five electric power connection lines, 6th row includes two electric power connection lines, 7th row includes that two electric power connection lines, the 8th row include that an electric power connection line, the 9th row include an electric power connection line.Visible the first row and the second row differ 0, and the second row and the third line differ 1, and the third line and fourth line differ 1, and fourth line and fifth line differ 2.Visible, the number of two adjacent row electric power connection line differences is unequal.
Those skilled in the art can set the position of electric power connection line the most flexibly, as long as electric power connection line connects two adjacent power lines in setting regions, can reduce the impedance of power line, it is thus achieved that preferably display effect.
Embodiment three,
Electric power connection line is gradually increased from both sides toward middle data, and adjacent rows electric power connection line difference number is equal, and spacing is equal, and every a line electric power connection line is discontinuous, and described setting regions can be multiple figure.
Embodiment three is with the difference of embodiment one, and electric power connection line adjacent in the electric power connection line of every a line is discontinuous.
As shown in Fig. 5 i, Fig. 5 j, Fig. 5 k and Fig. 5 f, the electric power connection line of every a line is discontinuous.
Embodiment four,
Electric power connection line is gradually increased from both sides toward middle data, and adjacent rows electric power connection line difference number is equal, and spacing is unequal, and every a line electric power connection line is continuous, and described setting regions can be multiple figure.
Embodiment four is with the difference of embodiment one, and the adjacent distance between two row electric power connection lines is unequal.As shown in fig. 5g.
Preferably, spacing pixel-driving circuit center between the electric power connection line of two power lines as identical in Fig. 5 h connection is gradually increased to pixel-driving circuit edge, so can more effectively reduce the power line equiva lent impedance in pixel-driving circuit central area, thus improve the brightness of pixel-driving circuit central area.
In order to obtain effect preferably in parallel, in each embodiment that the embodiment of the present invention improves, the material of electric power connection line is identical with power line, or the conductive capability of the material of electric power connection line is more than the conductive capability of the material of power line, thus reduces the dividing potential drop of the power line of pixel-driving circuit central area further.
As shown in Figure 8, the pixel-driving circuit provided by the embodiment of the present invention, its display effect is preferable, and pixel-driving circuit center is without obvious dark area.
As illustrated in fig. 9, the electric power connection line that the embodiment of the present invention provides can use the material identical with scan line, and now, electric power connection line can be arranged in the layer at scan line place, as shown in figure 9b, thus reduce process complexity, same, as is shown in fig. 9 c, the electric power connection line that the embodiment of the present invention provides can also use the material identical with pixel anode, now, electric power connection line can be arranged in the layer at pixel anode line place, as shown in figure 9d.Certainly, electric power connection line can also be arranged in other layers by those skilled in the art, or be individually for electric power connection line and arrange one layer.
The embodiment of the present invention correspondingly provides a kind of light emitting diode (LED) display screen, the pixel-driving circuit provided including the embodiment of the present invention.
The embodiment of the present invention correspondingly provides a kind of display device, the light emitting diode (LED) display screen provided including the embodiment of the present invention.
Obviously, those skilled in the art can carry out various change and modification without departing from the spirit and scope of the present invention to the present invention.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (11)

1. a pixel-driving circuit, including: pixel cell, at least two for the power line powered for described pixel cell, it is characterised in that also include:
At least electric power connection line, described electric power connection line, in the region set, connects adjacent two piece power line;The scope of described setting regions is gradually reduced to pixel-driving circuit edge from pixel-driving circuit center.
2. pixel-driving circuit as claimed in claim 1, it is characterized in that, described setting regions is symmetrical according to symmetrical and according to pixel-driving circuit the lower edges midpoint line of left and right edges midpoint line of pixel-driving circuit, and the scope of described setting regions is gradually reduced to axis of symmetry end points from axis of symmetry midpoint.
3. pixel-driving circuit as claimed in claim 2, it is characterised in that described setting regions be shaped as rhombus.
4. pixel-driving circuit as claimed in claim 3, it is characterised in that the described rhombus length of side particularly as follows: D 1 2 + D 2 2 / 2 ;
Wherein, D1For the left and right edges length of pixel-driving circuit, D2Lower edges length for pixel-driving circuit.
5. pixel-driving circuit as claimed in claim 1, it is characterized in that, in the pixel cell of setting regions at least one described, when connecting two adjacent power lines, described electric power connection line is setting the edge of pixel cell or between two adjacent pixel cells, connects adjacent two piece power line.
6. pixel-driving circuit as claimed in claim 1, it is characterised in that discontinuous between the electric power connection line of same a line.
7. pixel-driving circuit as claimed in claim 1, it is characterised in that the material of described electric power connection line is identical with described power line.
8. pixel-driving circuit as claimed in claim 1, it is characterised in that the conductive capability of the material of described electric power connection line is more than the conductive capability of the material of described power line.
9. pixel-driving circuit as claimed in claim 1, it is characterised in that the material of described electric power connection line is identical with the material of scan line, and described electric power connection line is arranged in the layer at described scan line place;Or
The material of described electric power connection line is identical with the material of pixel anode, and described electric power connection line is arranged in the layer at described pixel anode line place.
10. a light emitting diode (LED) display screen, it is characterised in that include the pixel-driving circuit as described in claim 1-9 is arbitrary.
11. 1 kinds of display devices, it is characterised in that include light emitting diode (LED) display screen as claimed in claim 10.
CN201210526418.7A 2012-12-07 2012-12-07 A kind of pixel-driving circuit, light emitting diode (LED) display screen and display device Active CN103268746B (en)

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CN109254462B (en) * 2018-11-12 2021-09-28 成都中电熊猫显示科技有限公司 Array substrate and liquid crystal display panel
CN111025798B (en) * 2019-12-02 2021-06-25 武汉华星光电半导体显示技术有限公司 Array substrate and display panel
CN113299722A (en) * 2021-05-31 2021-08-24 福州京东方显示技术有限公司 Display panel
WO2023050269A1 (en) * 2021-09-30 2023-04-06 京东方科技集团股份有限公司 Display panel and display apparatus

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