CN101363978A - Liquid crystal display and method for saving power loss - Google Patents
Liquid crystal display and method for saving power loss Download PDFInfo
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- CN101363978A CN101363978A CNA2007101411222A CN200710141122A CN101363978A CN 101363978 A CN101363978 A CN 101363978A CN A2007101411222 A CNA2007101411222 A CN A2007101411222A CN 200710141122 A CN200710141122 A CN 200710141122A CN 101363978 A CN101363978 A CN 101363978A
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Abstract
The invention provides a liquid crystal display (LCD) for reducing power loss and a method thereof. A drive circuit of the LCD includes a timing controller, a first data driver and a second data driver connected in series with the first drive circuit; a first transmission interface between the timing controller and the first data driver outputs a first digital signal; and then the first data driver outputs a second digital signal to the second data driver. The voltage of the logic high level of the first digital signal is larger than that of the second digital signal, and the output/input voltages of the first data driver and the second data driver can be different, so that the output voltage value of the timing controller can be reduced, and the power loss can be reduced.
Description
Technical field
The present invention is relevant a kind of technology of saving power dissipation, is meant a kind of method of saving the LCD of power dissipation and saving consume especially.
Technical background
Opto-electronics is flourish in recent years, wherein especially with the fast development of panel of LCD for.The application of panel of LCD is used for the most large product with the LCD that personal computer or mobile computer use, and the LCD TV development more than continuing when diagonal line 30; Aspect the small size liquid crystal panel, based on mobile phone, digital camera and PDA(Personal Digital Assistant) product, especially the application with mobile phone just accounts for the over half of all small size liquid crystal panels, the prosperity of LCD industry, driven the flourish of the relevant spare part industry in display upstream jointly, LCD drive integrated circuit (LCD Driver) is exactly one of fast-developing in recent years industry in Taiwan.
LCD is the variation that realizes that light is dark of reversing that sees through liquid crystal, and the chip for driving major function is that the output required voltage is to pixel, with the degree of reversing of control liquid crystal molecule, so the good corrupt of chip for driving is that can decision panel quality maximized key.The TFT-LCD chip for driving is combined by data driver (be called not only source driving chip) and scanning drive chip (but also being called the gate drive chip); Wherein data driver is served as X-axis driving task, and main being responsible for is sent to liquid crystal panel with image data, scans chip for driving and then lists in Y-axis, and the notice laterally pixel of each row will be imported data, determines reversing and speed of liquid crystal molecule.
In the technical development in TFT-LCD field, how saving power consumption is an important topic, on the power consumption of time schedule controller (timing controller), developed at present the logical operation that 1.8V, but in the design of data driver, still can't break through the bottleneck of minimum voltage 2.5V, the voltage that makes time schedule controller also must be that 2.5V just can transmit signals in the data driver, can't be with the data driver of the driven 2.5V of 1.8V, cause power consumption, in view of this, the present invention satisfies the shortcoming at above-mentioned known technology, a kind of differential technology of saving power dissipation of voltage layer by chip for driving output input is proposed, effectively to overcome the problems referred to above.
Summary of the invention
Fundamental purpose of the present invention provides a kind of LCD and method thereof of saving power dissipation, wherein the input voltage of each data driver and output voltage can be inequality, and utilize this characteristic, and make the exportable less voltage of time schedule controller give data driver, save power consumption.
Another object of the present invention provides a kind of LCD and method thereof of saving power dissipation, and it can drop to consumption minimum under the prerequisite that does not reduce LCD usefulness.
A further object of the present invention provides a kind of LCD and method thereof of saving power dissipation, and wherein first data driver can feed back a voltage signal to time schedule controller, to strengthen the voltage that time schedule controller is sent.
For reaching above-mentioned purpose, the invention provides a kind of LCD of saving power dissipation, it comprises display panel, backlight module and driving circuit, comprise again in this driving circuit: time schedule controller, the vision signal that receives is done the sequential conversion, and see through first transmission interface to export first digital signal; First data driver receives first digital signal and exports second digital signal; And second data driver, it is connected in series with first data driver, receive second digital signal and export three digital signal, and the voltage of the logic high levle of second digital signal is more than or equal to the voltage of the logic high levle of three digital signal, and the voltage of the logic high levle of first digital signal is greater than the voltage of the logic high levle of second digital signal.
The present invention provides a kind of method of saving power of liquid crystal display in addition, comprises the following steps: to utilize time schedule controller to send first digital signal to first data driver; First data driver is exported second digital signal to the second data driver; Second data driver receives output three digital signal after second digital signal, and the voltage of the logic high levle of second digital signal is more than or equal to the voltage of the logic high levle of three digital signal, and second data driver is sent to data in the backlight module.See through first data driver and second data driver of adjustable output voltage, one by one data are sent in the display panel.Wherein, the voltage of the logic high levle of first digital signal is greater than the voltage of the logic high levle of second digital signal.
Illustrate in detail below by specific embodiment, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 is the calcspar of LCD image data transmission.
Fig. 2 is the calcspar of driving circuit in the LCD of the present invention.
Fig. 3 is the calcspar of another driving circuit in the LCD of the present invention.
Fig. 4 is the synoptic diagram of RSDS signal.
Embodiment
The invention provides a kind of LCD and method thereof of saving power dissipation, it utilizes the characteristic of TTL digital interface, see through time schedule controller is input to data driver to the interface adjustment between the data driver magnitude of voltage, so that the input voltage of data driver is different with the accurate position of output voltage, significantly reduce the time schedule controller output voltage, power consumption is dropped to minimum.
Fig. 1 is the LCD of saving power dissipation provided by the present invention, comprise driving circuit 10, backlight module 12 and display panel 14, driving circuit 10 is responsible for image data is sent on the display panel 14, the action of control display panel 14, backlight module 12 then emits beam consistently and is radiated on the display panel 14.Wherein the framework of driving circuit 10 comprises time schedule controller 102, first data driver 104 and second data driver 106 as shown in Figure 2, and this time schedule controller 102 is done the sequential conversion with the vision signal that receives; The input end of first data driver 104 is connected with time schedule controller 102, and output terminal then is connected to second data driver, 106, the second data drivers 106 and rgb signal is sent in the display panel 14 again.
Another embodiment as shown in Figure 3, in first data driver 104, more inductor 109 can be set, in order to respond to first digital signal that time schedule controller 102 is exported, because the voltage of first digital signal may be gradually faint, if sensing the voltage of first digital signal, weakens gradually inductor 109, be not enough to produce the required operating voltage of data driver, then export feedback voltage and give time schedule controller 102, strengthen first digital signal.
Use transistor logic signal (transistor-transistor logic among the present invention, TTL) digital interface or other similar digital signal, low-swing differential signal (ReducedSwing Differential Signal for example, RSDS), as shown in Figure 4, the low-swing differential signal comprises P signal and n-signal two voltage wave bands, can obtain a class TTL signal behind this two signal subtraction, so also applicable to device and method of the present invention.
Since the cabling of chip for driving all be positioned on glass, because of its impedance is bigger, so power consumption is also bigger, if outputing to the magnitude of voltage of backlight module at last is 2.5V, may cause the terminal voltage deficiency, in order to keep power, the TTL voltage of signals is best at 3.3V.Utilize design of the present invention, time schedule controller only need be exported the voltage of 2.5V, adjusts output voltage values by each data driver, consumption is dropped to minimum under the prerequisite that does not reduce usefulness.
The above is preferred embodiment of the present invention only, is not to be used for limiting scope of the invention process.So all equalizations of having done according to described feature of the present patent application scope and spirit change or modify, and all should be included in the claim of the present invention.
Claims (14)
1. driving circuit of saving power dissipation comprises:
Time schedule controller carries out the sequential conversion with the vision signal that receives, and exports first digital signal through first transmission interface;
First data driver receives this first digital signal, and exports second digital signal; And
Second data driver, it is connected in series with this first data driver, receive this second digital signal and export three digital signal, and this second digital signal is more than or equal to this three digital signal;
Wherein, the voltage of the logic high levle of this first digital signal is different with the voltage of the logic high levle of this second digital signal.
2. the driving circuit of saving power dissipation as claimed in claim 1, wherein the voltage of the logic high levle of this first digital signal is greater than the voltage of the logic high levle of this second digital signal.
3. the driving circuit of saving power dissipation as claimed in claim 1, wherein this second data driver transmits data downwards one by one.
4. the driving circuit of saving power dissipation as claimed in claim 1 wherein is provided with inductor with inductive voltage value in this first data driver and this second data driver.
5. the driving circuit of saving power dissipation as claimed in claim 5, wherein the magnitude of voltage output feedback voltage sensed according to this inductor of this first data driver to this time schedule controller to strengthen this first digital signal.
6. the driving circuit of saving power dissipation as claimed in claim 1, wherein this first digital signal, this second digital signal and this three digital signal are transistor logic signal (transistor-transistor logic, TTL) or the low-swing differential signal (Reduced Swing Differential Signal, RSDS).
7. LCD of saving power comprises:
Display panel;
Backlight module can be with irradiate light on this display panel;
Time schedule controller, it carries out the sequential conversion with the vision signal that receives, and exports first digital signal;
At least one first data driver receives this first digital signal, and exports second digital signal; And
At least one second data driver, it is connected in series with this first data driver, receives this second digital signal and exports three digital signal, data are sent in this display panel, and this second digital signal is more than or equal to this three digital signal;
Wherein, the voltage of the logic high levle of this first digital signal is different with the voltage of the logic high levle of this second digital signal.
8. a method of saving power of liquid crystal display comprises the following steps:
Utilize time schedule controller to send first digital signal at least one first data driver;
This first data driver is exported second digital signal at least one second data driver; And
This second data driver is exported three digital signal after receiving this second digital signal, and this second digital signal is more than or equal to this three digital signal, and this second data driver is sent to data in the display panel.
9. the method for saving power of liquid crystal display as claimed in claim 15, wherein the voltage of the logic high levle of this first digital signal is greater than the voltage of the logic high levle of this second digital signal.
10. the method for saving power of liquid crystal display as claimed in claim 15, wherein this second data driver transmits data downwards one by one.
11. the method for saving power of liquid crystal display as claimed in claim 15 wherein is provided with inductor with inductive voltage value in this first data driver and this second data driver.
12. the method for saving power of liquid crystal display as claimed in claim 19, wherein the magnitude of voltage output feedback voltage sensed according to this inductor of this first data driver to this time schedule controller to strengthen this first digital signal.
13. the method for saving power of liquid crystal display as claimed in claim 15, wherein this first digital signal, this second digital signal and this three digital signal are transistor logic signal (transistor-transistor logic, TTL) or the low-swing differential signal (Reduced Swing Differential Signal, RSDS).
14. a driving circuit, in order to drive display panel, this driving circuit comprises:
Time schedule controller is exported first digital signal; And
Data driver receives this first digital signal, to export second digital signal; Wherein, the logic high levle of this first digital signal is first high voltage, and the logic high levle of this second digital signal is second high voltage, and this first high voltage is greater than this second high voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710141122 CN101363978B (en) | 2007-08-08 | 2007-08-08 | Liquid crystal display and method for saving power loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710141122 CN101363978B (en) | 2007-08-08 | 2007-08-08 | Liquid crystal display and method for saving power loss |
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| Publication Number | Publication Date |
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| CN101363978A true CN101363978A (en) | 2009-02-11 |
| CN101363978B CN101363978B (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200710141122 Expired - Fee Related CN101363978B (en) | 2007-08-08 | 2007-08-08 | Liquid crystal display and method for saving power loss |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918580A (en) * | 2010-03-31 | 2013-02-06 | 苹果公司 | Reduced-power communications within an electronic display |
-
2007
- 2007-08-08 CN CN 200710141122 patent/CN101363978B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918580A (en) * | 2010-03-31 | 2013-02-06 | 苹果公司 | Reduced-power communications within an electronic display |
| CN102918580B (en) * | 2010-03-31 | 2016-08-10 | 苹果公司 | Lower powered communication is dropped in electronic displays |
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| CN101363978B (en) | 2013-02-06 |
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