CN100345034C - Plane display panel of built-in DC-DC converter - Google Patents
Plane display panel of built-in DC-DC converter Download PDFInfo
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- CN100345034C CN100345034C CNB2004100791254A CN200410079125A CN100345034C CN 100345034 C CN100345034 C CN 100345034C CN B2004100791254 A CNB2004100791254 A CN B2004100791254A CN 200410079125 A CN200410079125 A CN 200410079125A CN 100345034 C CN100345034 C CN 100345034C
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- converter
- power supply
- display panel
- substrate
- driving circuit
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 7
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention relates to a plane display panel which comprises a basal plate, a plurality of pixel electrodes, a drive circuit, at least two positive voltage DC/DC converters, wherein the pixel electrodes are formed on the basal plate in a matrix way. The drive circuit is formed on the basal plate; moreover, the drive circuit also comprises a plurality of components for driving the pixel electrodes; furthermore, the components can be at least divided into two power supply objects. Subsequently, at least the two positive voltage DC/DC converters are formed on the basal plate and are used for supplying the power to the power supply objects according to the power supplying requirement of at least the two power supply objects.
Description
Technical field
The relevant a kind of two-d display panel of the present invention, and the low temperature polycrystalline silicon liquid crystal panel of relevant a kind of built-in DC-DC converter particularly with built-in DC-DC converter.
Background technology
At low temperature polycrystalline silicon LCD (low-temperature ploysilicon LCD, LTPS LCD) in the technology, because the mobility (mobility) of polysilicon is also faster than amorphous silicon, so its driving circuit can directly form on the glass substrate of low temperature polycrystalline silicon LCD.Thus, integrate driving circuit on substrate, have faster the electron reaction (faster electron response), also have the panel of reduction power consumption, reduce the outer set number of packages that connects and advantage such as online except making pixel.
The low temperature polycrystalline silicon LCD is to utilize DC-to-DC converter to provide power supply to driving circuit.Please refer to Fig. 1, it is the circuit diagram of general DC-to-DC converter.DC-to-DC converter 110 is in order to provide direct supply to load 120.The equivalent electrical circuit of load 120 comprises resistance R load and capacitor C load, and load current is to be Iload.DC-to-DC converter 110 comprises transistor S1, S2, S3 and S4, capacitor C boost and Chold, in order to direct supply Vdc is boosted, and produces output voltage V 2x.
Along with liquid crystal panel strides forward toward large scale, the required electric current that provides of DC-to-DC converter also strengthens thereupon.Yet, in the low temperature polycrystalline silicon liquid crystal panel, because the chip area occupied of DC-to-DC converter is bigger, therefore generally in large-sized low temperature polycrystalline silicon display panels, for saving the available area of panel, still connect low temperature polycrystalline silicon display panels and DC-to-DC converter, thereby can't fill a part benefit of utilizing the low temperature polycrystalline silicon lcd technology to be brought in external mode.
Please refer to Fig. 2 A, it is the area and the output voltage graph of a relation of the DC-to-DC converter among Fig. 1.When required load current Iload is 0.5mA, when output voltage V 2x was 8V, the required area reference value k of the assembly of DC-to-DC converter 110 was 1.When required load current Iload increase twice is 1mA, and desire to keep identical output voltage V 2x=8V, then the required area reference value k of the assembly of DC-to-DC converter 110 but must increase to 4.That is to say that desire increases twice with load current Iload, then the required area of the assembly of DC-to-DC converter 110 must increase to 4 times.
Please refer to Fig. 2 B, it is assembly area and its relationship between efficiency synoptic diagram of DC-to-DC converter.When the load current Iload of DC-to-DC converter 110 outputs was 0.5mA, its efficient can reach 90 percent.And when load current Iload was 1mA, its efficient but only was left about 70 percent.Therefore, DC-to-DC converter except will with panel size strengthen and must significantly increase its area, efficient again low problem.
By above explanation as can be known, how effectively to control the area of DC-to-DC converter, so that be built in the low temperature polycrystalline silicon display panels in the energy, can improve simultaneously the area service efficiency of panel again, be the problem of the anxious desire solution of dealer institute always.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of DC-to-DC converter of dwindling area, be built on the low temperature polycrystalline silicon display panels with interior.
For realizing purpose of the present invention, the present invention proposes a kind of two-d display panel, comprises substrate, a plurality of pixel electrode, driving circuit and at least two positive voltage DC-to-DC converter.Pixel electrode is formed on the substrate with arranged.Driving circuit is formed on this substrate, comprises a plurality of assemblies, and in order to these a plurality of pixel electrodes of driving, and these a plurality of assemblies can be divided at least two power supply objects.According to the power demands of these at least two power supply objects, these at least two positive voltage DC-to-DC converter are formed on the substrate, in order to these at least two power supply objects are powered.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, will be elaborated especially exemplified by a preferred embodiment and conjunction with figs. below.
Description of drawings
Fig. 1 is the circuit diagram of general DC-to-DC converter.
Fig. 2 A is the area and the output voltage graph of a relation of the DC-to-DC converter among Fig. 1.
Fig. 2 B is assembly area and its relationship between efficiency synoptic diagram of DC-to-DC converter.
Fig. 3 is for according to the driving circuit synoptic diagram that is built in the low temperature polycrystalline silicon liquid crystal panel in the present invention one first embodiment a kind of.
Fig. 4 is for according to the driving circuit synoptic diagram that is built in the low temperature polycrystalline silicon liquid crystal panel in the present invention one second embodiment a kind of.
Embodiment
Please refer to Fig. 3, it is the synoptic diagram according to first embodiment of the invention.Driving circuit 400 is to be formed on the substrate (not being shown in figure), provides positive voltage Vdd by two each and every one other positive voltage DC-to- DC converter 410 and 420, and provides negative voltage Vss by two each and every one other negative voltage DC-to-DC converter 430 and 440.Positive voltage DC-to- DC converter 410 and 420 and negative voltage DC-to- DC converter 430 and 440 be formed at all equally on the substrate (not being shown in figure).As low temperature polycrystalline silicon technology, pixel electrode (not being shown in figure), driving circuit 400, positive voltage DC-to- DC converter 410 and 420 and negative voltage DC-to- DC converter 430 and 440 all can low temperature polycrystalline silicon technology be formed on the substrate and (be shown in figure).
Driving circuit 400 comprises assemblies such as shift register (shift registers) 451, impact damper 453, sampling maintainer 455, the accurate adjuster in position (level shifters) 457, impact damper (buffer) 459 and digital analog converter (digital-to-analog converters) 461 at least, to drive pixel electrode.
In the present embodiment, the present invention is divided into one group of power supply object with impact damper 453, the accurate adjuster 457 of sampling maintainer 455 and position, shift register 451, impact damper 459 and digital analog converter 461 then are divided into another group power supply object, but be not limited to these two groups, practical application is then decided according to the power demands of each assembly.
Because present embodiment respectively is divided into two groups with traditional one group of positive voltage DC-to-DC converter and one group of negative voltage DC-to-DC converter, therefore can look the required electric energy of each assembly in the driving circuit 400, and determine the power supply object of two positive voltage DC-to- DC converter 410 and 420 and two negative voltage DC-to- DC converter 430 and 440.
Through after being grouped into different power supply objects, positive voltage DC-to- DC converter 410 and 420 area reference value k are respectively 1, and export the load current of 0.5mA respectively, so the positive voltage DC-to- DC converter 410 and 420 of present embodiment can provide the load current of 1mA altogether.If contrast conventional practice, shown in Fig. 2 A, only use a positive voltage DC-to-DC converter that the 1mA electric current is provided, its area reference value k is required to be 4, and present embodiment uses two positive voltage DC-to-DC converter that the 0.5mA electric current is provided respectively, the summation of its area reference value k only is 2, thus present embodiment than the area of conventional practice little twice.
Referring again to Fig. 2 B, conventional practice is only used a voltage DC-to-DC converter that the 1mA electric current is provided, its conversion efficiency only has an appointment 70 percent, and the positive voltage DC-to-DC converter of present embodiment because of using two 0.5mA is provided respectively, so the conversion efficiency of present embodiment can reach 90 percent.
Similarly, two negative voltage DC-to- DC converter 430 and 440 area reference value k are respectively 1, and export the load current of 0.5mA respectively.Therefore two negative voltage DC-to-DC converter of present embodiment can provide the load current of 1mA altogether.But the application of load voltage DC-to- DC converter 430 and 440 is decided on actual conditions, is not the ratio that becomes equity with the positive voltage DC-to-DC converter.
Fig. 4 shows the synoptic diagram of the second embodiment of the present invention.Second embodiment and first embodiment are with the manufacturing of low temperature polycrystalline silicon technology equally, and difference is positive voltage DC-to- DC converter 410 and 420 different with negative voltage DC-to- DC converter 430 and 440 objects of being powered.Each assembly in the driving circuit 400 can respectively be divided into half.As shown in the figure, the shift register 451a and the 451b that shift register 451 are divided into first and second half circuit; Impact damper 453 is divided into the impact damper 453a and the 453b of first and second half circuit; Sampling maintainer 455 is divided into the sampling maintainer 455a and the 455b of first and second half circuit; The accurate adjuster 457 in position is divided into the accurate adjuster 457a in position and the 457b of first and second half circuit; Impact damper 459 is divided into the impact damper 459a and the 459b of first and second half circuit; Digital analog converter 461 is divided into the digital analog converter 461a and the 461b of first and second half circuit.
Be to give shift register 451b, impact damper 453b, sampling maintainer 455b, position accurate adjuster 457b, impact damper 459b and digital analog converter 461b in the present embodiment with 410 power supplies of positive voltage DC-to-DC converter.Give shift register 451a, impact damper 453a, sampling maintainer 455a and position accurate adjuster 457a, impact damper 459a and digital analog converter 461a with 420 power supplies of positive voltage DC-to-DC converter.
On the other hand, negative voltage DC-to-DC converter 430 is that position accurate adjuster 457b, impact damper 459b and digital analog converter 461b are given in power supply.Position accurate adjuster 457a, impact damper 459a and digital analog converter 461a are given in 440 power supplies of negative voltage DC-to-DC converter.These negative voltage DC-to-DC converter 430,440 do not become peer-to-peer with positive voltage DC-to-DC converter 410,420.
The power supply object of these DC-to-DC converter is except above-mentioned two described situations of embodiment, also can look the required electric energy of each assembly in the driving circuit in addition and other combination is arranged, the personnel that know this technology can be changed according to the practical application situation, no longer describe in detail in this.
The display panels of the built-in DC-DC converter that the above embodiment of the present invention disclosed, except being applied in the low temperature polycrystalline silicon display panels, also can be applied in addition can be on substrate the display panel of built in channel, for example be organic LED display panel etc.The present invention can effectively reduce the shared area of DC-to-DC converter, therefore can in be built on the panel, move efficient so that high load currents and high electronics to be provided, also can improve product integration simultaneously, and then save cost.
In sum; though the present invention discloses as above with a preferred embodiment; yet it is not in order to limit the present invention; any person skilled in the art person without departing from the spirit and scope of the present invention; when the change that can do various equivalences or replacement, so protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.
Claims (7)
1. two-d display panel comprises at least:
One substrate;
A plurality of pixel electrodes are formed on this substrate with arranged;
One drive circuit is formed on this substrate, comprises a plurality of assemblies, and in order to these a plurality of pixel electrodes of driving, and these a plurality of assemblies are divided into first group of power supply object and second group of power supply object at least;
One first positive voltage DC-to-DC converter is formed on this substrate, in order to this first group power supply object powered; And
One second positive voltage DC-to-DC converter is formed on this substrate, in order to this second group power supply object powered.
2. two-d display panel as claimed in claim 1 is characterized in that: also comprise:
At least one negative voltage DC-to-DC converter is formed on this substrate, in order to this first group or the two groups objects of powering are powered.
3. two-d display panel as claimed in claim 1 is characterized in that: the assembly of this driving circuit comprises an offset buffer, one first impact damper, a sampling maintainer, accurate adjuster, one second impact damper and a digital analog converter at least.
4. two-d display panel as claimed in claim 2 is characterized in that: described first power supply object and above-mentioned second power supply to as if decide according to the power demands of the assembly of described driving circuit.
5. two-d display panel as claimed in claim 1, it is characterized in that: each assembly of described driving circuit is divided into two and half circuit, described first power supply is to liking one of them half circuit of described driving circuit, and described second power supply is to liking another half circuit of described driving circuit.
6. two-d display panel as claimed in claim 1, it is characterized in that: described a plurality of pixel electrodes, described driving circuit, the described first positive voltage DC-to-DC converter, and the described second positive voltage DC-to-DC converter is to be formed on the described substrate with low temperature polycrystalline silicon technology.
7. two-d display panel as claimed in claim 2 is characterized in that: described at least one negative voltage DC-to-DC converter is to be formed on the described substrate with low temperature polycrystalline silicon technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100791254A CN100345034C (en) | 2004-09-08 | 2004-09-08 | Plane display panel of built-in DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100791254A CN100345034C (en) | 2004-09-08 | 2004-09-08 | Plane display panel of built-in DC-DC converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588192A CN1588192A (en) | 2005-03-02 |
| CN100345034C true CN100345034C (en) | 2007-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100791254A Expired - Fee Related CN100345034C (en) | 2004-09-08 | 2004-09-08 | Plane display panel of built-in DC-DC converter |
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| CN (1) | CN100345034C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0447919A2 (en) * | 1990-03-13 | 1991-09-25 | Stanley Electric Co., Ltd. | Drive circuit for dot matrix display |
| US5712778A (en) * | 1994-04-18 | 1998-01-27 | Samsung Electronics Co., Ltd. | Voltage multiplying DC-DC converter for a thin film transistor liquid crystal display |
| CN1223426A (en) * | 1997-08-08 | 1999-07-21 | 三星电子株式会社 | Multiple output DC/DC voltage converter and liquid crystal display using thereof |
| JP2002132228A (en) * | 2000-10-26 | 2002-05-09 | Advanced Display Inc | Liquid crystal display device |
| JP2002313925A (en) * | 2001-04-10 | 2002-10-25 | Hitachi Ltd | Semiconductor integrated circuit incorporating power supply circuit, liquid crystal display controller and portable electronic apparatus |
-
2004
- 2004-09-08 CN CNB2004100791254A patent/CN100345034C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0447919A2 (en) * | 1990-03-13 | 1991-09-25 | Stanley Electric Co., Ltd. | Drive circuit for dot matrix display |
| US5712778A (en) * | 1994-04-18 | 1998-01-27 | Samsung Electronics Co., Ltd. | Voltage multiplying DC-DC converter for a thin film transistor liquid crystal display |
| CN1223426A (en) * | 1997-08-08 | 1999-07-21 | 三星电子株式会社 | Multiple output DC/DC voltage converter and liquid crystal display using thereof |
| JP2002132228A (en) * | 2000-10-26 | 2002-05-09 | Advanced Display Inc | Liquid crystal display device |
| JP2002313925A (en) * | 2001-04-10 | 2002-10-25 | Hitachi Ltd | Semiconductor integrated circuit incorporating power supply circuit, liquid crystal display controller and portable electronic apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1588192A (en) | 2005-03-02 |
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