CN101363978B - 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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- CN101363978B CN101363978B CN 200710141122 CN200710141122A CN101363978B CN 101363978 B CN101363978 B CN 101363978B CN 200710141122 CN200710141122 CN 200710141122 CN 200710141122 A CN200710141122 A CN 200710141122A CN 101363978 B CN101363978 B CN 101363978B
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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, refers to especially a kind of method of saving the liquid crystal display of power dissipation and saving consume.
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 liquid crystal display that personal computer or mobile computer use, and continues the LCD TV development more than diagonal line 30 inch; Aspect the small size liquid crystal panel, take mobile phone, digital camera and personal digital assistant (PDA) product as main, especially the application with mobile phone just accounts for the over half of all small size liquid crystal panels, the prosperity of liquid crystal display industry, driven jointly the flourish of the relevant spare part industry in display upstream, LCD drive integrated circuit (LCD Driver) is exactly one of industry of in recent years fast development of Taiwan.
Liquid crystal display is the variation that realizes that light is dark reversed that sees through liquid crystal, and drive the chip major function be the output required voltage to pixel, with the degree of reversing of control liquid crystal molecule, be that can the decision panel quality maximized key therefore drive the good corrupt of chip.TFT-LCD drives chip and is combined with scanning drive chip (but also being called the gate drive chip) by data driver (be called not only source driving chip); Wherein data driver is served as X-axis and is driven task, and main being responsible for is sent to liquid crystal panel with image data, scans the driving chip and then lists in Y-axis, and the notice laterally pixel of each row will be inputted 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 of 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 drive with the voltage of 1.8V the data driver of 2.5V, cause power consumption, in view of this, the present invention satisfies the shortcoming for above-mentioned known technology, propose a kind of by driving the differential technology of saving power dissipation of voltage layer of chip output input, effectively to overcome the problems referred to above.
Summary of the invention
Fundamental purpose of the present invention provides a kind of liquid crystal display and method thereof of saving power dissipation, wherein the input voltage of each data driver can be not identical with output voltage, and utilize this characteristic, and make the exportable less voltage of time schedule controller to data driver, save power consumption.
Another object of the present invention provides a kind of liquid crystal display and method thereof of saving power dissipation, and it can drop to consumption minimum under the prerequisite that does not reduce liquid crystal display usefulness.
A further object of the present invention provides a kind of liquid crystal display and method thereof of saving power dissipation, and wherein the first data driver can feed back a voltage signal to time schedule controller, the voltage of being sent to strengthen time schedule controller.
For reaching above-mentioned purpose, the invention provides a kind of driving circuit of saving power dissipation, comprising: time schedule controller, carry out the sequential conversion with the vision signal that receives, and export the first digital signal through the first transmission interface; The first data driver receives this first digital signal, and exports the 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, this first digital signal, this second digital signal and this three digital signal are transistor logic signal or low-swing differential signal, and the voltage of the logic high levle of this first digital signal is different from the voltage of the logic high levle of this second digital signal.
For reaching above-mentioned purpose, the invention provides a kind of liquid crystal display 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 the first transmission interface to export the first digital signal; The first data driver receives the first digital signal and exports the second digital signal; And second data driver, it is connected in series with the first data driver, receive the second digital signal and export three digital signal, wherein, this first digital signal, this second digital signal and this three digital signal are transistor logic signal or low-swing differential signal, and the voltage of the logic high levle of the 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 the first digital signal is greater than the voltage of the logic high levle of the 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 the first digital signal to the first data driver; The first data driver is exported the second digital signal to the second data driver; The second data driver receives output three digital signal after the second digital signal, and the voltage of the logic high levle of the second digital signal is more than or equal to the voltage of the logic high levle of three digital signal, and the second data driver is sent to data in the backlight module.See through the first data driver and second data driver of adjustable output voltage, one by one data are sent in the display panel.Wherein, this first digital signal, this second digital signal and this three digital signal are transistor logic signal or low-swing differential signal, and the voltage of the logic high levle of the first digital signal is greater than the voltage of the logic high levle of the second digital signal.
The present invention provides a kind of driving circuit in addition, and in order to drive display panel, this driving circuit comprises: time schedule controller, export the first digital signal; And data driver, receive this first digital signal, to export the second digital signal; Wherein, this first digital signal and this second digital signal are transistor logic signal or low-swing differential signal, and the logic high levle of this first digital signal is the first high voltage, the logic high levle of this second digital signal is the second high voltage, and this first high voltage is greater than this second high voltage.
Illustrate in detail below by specific embodiment, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and reaches.
Description of drawings
Fig. 1 is the calcspar of LCD image data transmission.
Fig. 2 is the calcspar of driving circuit in the liquid crystal display of the present invention.
Fig. 3 is the calcspar of another driving circuit in the liquid crystal display of the present invention.
Fig. 4 is the schematic diagram of RSDS signal.
Embodiment
The invention provides a kind of liquid crystal display 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 from the output voltage level, significantly reduce the time schedule controller output voltage, power consumption is dropped to minimum.
Fig. 1 is the liquid crystal display 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 emit beam consistently and are radiated on the display panel 14.Wherein the framework of driving circuit 10 comprises time schedule controller 102, the first data driver 104 and the 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 the first data driver 104 is connected with time schedule controller 102, and output terminal then is connected to the 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 the first data driver 104, more inductor 109 can be set, the first digital signal of exporting in order to respond to time schedule controller 102, because the voltage of the first digital signal may be gradually faint, if sensing the voltage of the first digital signal, weakens gradually inductor 109, be not enough to produce the required operating voltage of data driver, then export feedback voltage to time schedule controller 102, strengthen the 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 (Reduced Swing 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, therefore also applicable to device and method of the present invention.
Since drive the cabling of chip and all be positioned on glass, because its impedance is larger, therefore power consumption is also larger, if outputing at last the magnitude of voltage of backlight module is 2.5V, may cause terminal voltage not enough, in order to keep power, the voltage of TTL signal 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 limit scope of the invention process.So all equalizations of having done according to the 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 (12)
1. driving circuit of saving power dissipation comprises:
Time schedule controller carries out the sequential conversion with the vision signal that receives, and exports the first digital signal through the first transmission interface;
The first data driver receives this first digital signal, and exports the second digital signal; And
The 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, this first digital signal, this second digital signal and this three digital signal are transistor logic signal or low-swing differential signal, and
The voltage of the logic high levle of this first digital signal is different from 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 4, 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. liquid crystal display of saving power comprises:
Display panel;
Backlight module can shine light on this display panel;
Time schedule controller, it carries out the sequential conversion with the vision signal that receives, and exports the first digital signal;
At least one first data driver receives this first digital signal, and exports the 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, this first digital signal, this second digital signal and this three digital signal are transistor logic signal or low-swing differential signal, and
The voltage of the logic high levle of this first digital signal is different from the voltage of the logic high levle of this second digital signal.
7. a method of saving power of liquid crystal display comprises the following steps:
Utilize time schedule controller to send the first digital signal at least one first data driver;
This first data driver is exported the second digital signal at least one the 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,
Wherein, this first digital signal, this second digital signal and this three digital signal are transistor logic signal or low-swing differential signal, and
The voltage of the logic high levle of this first digital signal is different from the voltage of the logic high levle of this second digital signal.
8. the method for saving power of liquid crystal display as claimed in claim 7, 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.
9. the method for saving power of liquid crystal display as claimed in claim 7, wherein this second data driver transmits data downwards one by one.
10. the method for saving power of liquid crystal display as claimed in claim 7 wherein is provided with inductor with inductive voltage value in this first data driver and this second data driver.
11. the method for saving power of liquid crystal display as claimed in claim 10, 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.
12. a driving circuit, in order to drive display panel, this driving circuit comprises:
Time schedule controller is exported the first digital signal; And
Data driver receives this first digital signal, to export the second digital signal;
Wherein, this first digital signal and this second digital signal are transistor logic signal or low-swing differential signal, and the logic high levle of this first digital signal is the first high voltage, the logic high levle of this second digital signal is the 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101363978A CN101363978A (en) | 2009-02-11 |
| CN101363978B true 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8564522B2 (en) * | 2010-03-31 | 2013-10-22 | Apple Inc. | Reduced-power communications within an electronic display |
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| CN101363978A (en) | 2009-02-11 |
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