CN101685593B - Device and method for improving contrast value of display panel and image display system - Google Patents
Device and method for improving contrast value of display panel and image display system Download PDFInfo
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- CN101685593B CN101685593B CN 200810165763 CN200810165763A CN101685593B CN 101685593 B CN101685593 B CN 101685593B CN 200810165763 CN200810165763 CN 200810165763 CN 200810165763 A CN200810165763 A CN 200810165763A CN 101685593 B CN101685593 B CN 101685593B
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Abstract
The invention relates to a device and a method for improving the contrast value of a display panel and an image display system. The device comprises a controller and an optical detector. The method comprises the following steps: providing a plurality of voltage values for the display panel, detecting a plurality of brightness values respectively generated by the display panel according to the voltage values, and selecting one voltage value corresponding to one extremum of the brightness values as the peak voltage of the display panel. The image display system is integrated with the display panel and a memory, wherein the peak voltage selected by the contrast-value improving method is memorized in the memory. The invention improves the contrast value of the display panel.
Description
Technical field
The present invention relates to a kind of correlative value and improve apparatus and method and image display system, relate in particular to the correlative value that is applied on the display panel and improve apparatus and method and image display system.
Background technology
The brightness value that in the darkroom the complete white picture of LCD is measured namely is defined as correlative value (contrast ratio) divided by the resulting numerical value of brightness value that complete black picture measures, so white is more bright, black is more dark, and then correlative value is more high.And the correlative value of working as LCD is more high, and the image quality that presents is more good, therefore, and the direction that the correlative value of raising LCD is made great efforts for manufacturer.
See also Fig. 1, its representative puts on pixel voltage value in the LCD with respect to the change curve of light transmittance.As shown in the figure, when the pixel voltage value is 0, the light transmittance of this pixel cell is maximal value, and along with the pixel voltage value increases, the light transmittance of this pixel cell will successively decrease thereupon, when the pixel voltage value increases to a reversal voltage (reverse voltage), the light transmittance of this pixel cell will be down to a minimum value.But if the pixel voltage value increases to greater than reversal voltage (reverse voltage) time again, the light transmittance of this pixel cell will can begin rapid rising on the contrary, this phenomenon is called as " gray-scale inversion (Gray level inversion) ", be common in the various liquid crystal panel, for example ECB electrically controlled birefringence (electrically controlled birefringence, be called for short ECB) mode liquid crystal panel or aligned twisted pattern+view film (TN mode+wide view film) liquid crystal panel etc.
Therefore, the correlative value in the ideal should be to be that 0 o'clock the brightness value brightness value when being reversal voltage (reverse voltage) divided by the pixel voltage value defines by the pixel voltage value.In other words, when the maximal value (black voltage that just is commonly called as) of pixel voltage value is fixed on reversal voltage (reverse voltage), just can allow this panel obtain best correlative value, but, because the variation on the panel manufacturing process, to cause the corresponding pixel voltage value of liquid crystal panel after each assembling is finished also incomplete same with respect to the change curve of light transmittance, curve 1 as shown in FIG., curve 2 and curve 3, its reversal voltage 1, reversal voltage 2 and reversal voltage 3 will be dispersed in the voltage range 10.And in existing means, for avoiding " gray-scale inversion " phenomenon produce, manufacturer just can unify the black voltage of different qualities liquid crystal panel is all fixed on a fixed value at lower bound 101 places in reversal voltage interval, to obtain bigger error cushion space.This panel just can't obtain its real best correlative value performance, and how to improve above-mentioned many defectives, just is development fundamental purpose of the present invention but thus.
Summary of the invention
The object of the present invention is to provide a kind of correlative value to improve apparatus and method and image display system, to improve the defective of prior art.
The present invention is a kind of correlative value improvement method, is applied on the display panel, and this method comprises the following step: provide a plurality of magnitudes of voltage to this display panel; Detect this display panel according to described a plurality of magnitudes of voltage a plurality of brightness values of producing respectively; And select for use the corresponding magnitude of voltage of a predetermined value in described a plurality of brightness value to be a crest voltage of this display panel.
According to above-mentioned conception, correlative value improvement method of the present invention wherein selects for use this magnitude of voltage can comprise the step that this crest voltage is stored in a storer for the method for this limiting voltage of this display panel.
According to above-mentioned conception, correlative value improvement method of the present invention, this predetermined value in wherein said a plurality of brightness values can be an extreme value, and this extreme value can be a minimum value or a maximal value in described a plurality of brightness value.
According to above-mentioned conception, correlative value improvement method of the present invention, wherein this crest voltage can be a black voltage or white appliances pressure.
Another aspect of the invention is a kind of correlative value and improve device, be applied on the display panel, this device comprises: a controller is electrically connected on this display panel, it provides a plurality of magnitudes of voltage to this display panel, makes this display panel produce a plurality of brightness values respectively according to described a plurality of magnitudes of voltage; An and photodetector, be electrically connected on this controller, convert corresponding a plurality of electric signal in order to detect described a plurality of brightness value and deliver to this controller, making this controller can select the corresponding magnitude of voltage of a predetermined value in described a plurality of brightness value for use is a crest voltage of this display panel.
According to above-mentioned conception, correlative value of the present invention is improved device, and it also can comprise a storer, in order to store this crest voltage.
According to above-mentioned conception, correlative value of the present invention is improved device, and wherein this storer can be a nonvolatile memory.
According to above-mentioned conception, correlative value of the present invention is improved device, and wherein this nonvolatile memory is finished with removing nonvolatile memory.
According to above-mentioned conception, correlative value of the present invention is improved device, and wherein this nonvolatile memory is finished with disposable programmable non-volatile memory.
According to above-mentioned conception, correlative value of the present invention is improved device, and this predetermined value in wherein said a plurality of brightness values can be an extreme value.
According to above-mentioned conception, correlative value of the present invention is improved device, and this extreme value in wherein said a plurality of brightness values can be a minimum value or the maximal value in described a plurality of brightness value.
According to above-mentioned conception, correlative value of the present invention is improved device, and wherein this crest voltage can be a black voltage or white appliances pressure.
Of the present invention is a kind of image display system more on the one hand, comprising: a LCD, and it comprises a display panel, and improves device as this above-mentioned correlative value; And a power supply unit, be coupled to aforementioned display panel and provide power supply to aforementioned display panel.
According to above-mentioned conception, image display system of the present invention can be a mobile phone, a digital camera, a personal digital assistant, a notebook computer, a desk-top computer, a TV, a GPS, an automobile-used display, an aviation display, a digital frame or a portable DVD player projector.
According to above-mentioned conception, image display system of the present invention, wherein aforementioned display panel is a LCD or an organic LED display panel.
Another aspect of the present invention is a kind of image display system, comprising: a display panel; This crest voltage that one storer, this memory stores have above-mentioned correlative value improvement method to select; And a power supply unit, be coupled to aforementioned display panel and provide power supply to aforementioned display panel.
The present invention has improved the correlative value of display panel, has improved image quality.
Description of drawings
The application obtains a more deep understanding by following accompanying drawing and explanation:
Fig. 1, its representative puts on pixel voltage value in the LCD with respect to the change curve of light transmittance.
Fig. 2, it is that the present invention improves the function block diagram that correlative value that the prior art defective develops is out improved device.
Fig. 3, it is the schematic flow sheet of disclosed correlative value improvement method.
Fig. 4, it is the image display system synoptic diagram of another embodiment of using the technology of the present invention means and finishing.
Wherein, description of reference numerals is as follows:
Driver IC 24 LCD 60
Embodiment
See also Fig. 2, it is that the present invention improves the function block diagram that correlative value that the prior art defective develops is out improved device, it is mainly used on the display panel 20, and this device includes a controller 21, a photodetector 22 and a storer 23.Its middle controller 21 is electrically connected on this display panel 20, it provides a plurality of magnitudes of voltage to make driver IC (driver IC) 24 drive this display panel 20, makes this display panel 20 can produce the picture with different brightness according to described a plurality of magnitudes of voltage respectively.
And when described a plurality of magnitudes of voltage mainly are distributed in as shown in fig. 1 voltage range 10, this display panel 20 just can produce the black picture of different brightness, utilize this moment photodetector 22 to detect the brightness value of the black picture of different brightness and convert corresponding a plurality of electric signal to and deliver to this controller 21 and judge, and then select for use the corresponding magnitude of voltage of a predetermined value (this example is minimum value) in described a plurality of brightness value to be used as a black voltage of this display panel 20.Store in the last numerical value write store 23 that will represent this black voltage again.Thus, driver IC (driver IC) 24 is by the numerical value that reads the storer 23 that is integrated in wherein, just can obtain optimization black voltage corresponding to this display panel and drive this display panel and show, and then reach and to obtain the correlative value that an optimization black voltage individually improves each display panel at each display panel.
See also Fig. 3 again, it is the disclosed correlative value improvement method of expressing in the schematic flow sheet mode, at first, provide a plurality of magnitudes of voltage to display panel, see step 301, make display panel can produce the image frame of a plurality of different brightness values according to described a plurality of magnitudes of voltage respectively, then detect a plurality of brightness values of described a plurality of image frames of display panel demonstration, see step 302, select for use the corresponding magnitude of voltage of an extreme value in described a plurality of brightness value to be a crest voltage of this display panel then, step 303, and this crest voltage is stored in the storer, see step 304, and then offer display panel and carry out later use.
And be example with the liquid crystal panel of usual white (Normally white), this extreme value in a plurality of brightness value described above is the minimum value in described a plurality of brightness value, and this crest voltage is a black voltage, and driver IC (driver IC) 24 facilities drive the image demonstration that usual white liquid crystal panel carries out multiple brightness with 0 to the magnitude of voltage between black voltage.And if be the liquid crystal panel of usual black (Normally black), then this extreme value in described a plurality of brightness value is the maximal value in described a plurality of brightness value, and this crest voltage is white appliances pressures, and then driver IC (driver IC) 24 facilities drive the image demonstration that usual black liquid crystal panel carries out multiple brightness with 0 to the magnitude of voltage between the white appliances pressure.
See also shown in Figure 4ly again, it is the image display system synoptic diagram of another embodiment of using the technology of the present invention means and finishing.In the present embodiment, mainly be to disclose an image display system 600, it can comprise a LCD 60 and a power supply unit 500.Wherein include the display panel 20 that utilizes correlative value improvement method of the present invention to handle, the driver IC (driver IC) 24 that stores the storer 23 of the resulting crest voltage numerical value of this method and utilize this crest voltage numerical value to carry out the image demonstration in this LCD 60, and this power supply unit 500 is coupled to LCD 60 to provide electric energy to LCD 60.
And above-mentioned storer 23 can be with common nonvolatile memory, for example flash memory (Flash memory) etc. can be removed nonvolatile memory, or One Time Programmable (One-Time Programming, abbreviation OTP) nonvolatile memory is finished, and this storer 23 can integrate and insert in driver IC (driver IC) 24 or other integrated circuit, can certainly arrange separately.As for 600 of this image display systems can be: any during mobile phone, digital camera, personal digital assistant, notebook computer, desk-top computer, TV, GPS (GPS), automobile-used display, aviation are installed with display, digital frame (Digital Photo Frame) or portable DVD player projector etc.In addition, the technology of the present invention means can be migrated to the display panel of other kinds, for example with Organic Light Emitting Diode (Organic Light Emitting Diode, the display panel of OLED) finishing.So the present invention must can make various modifications by those of ordinary skills, however the scope of neither disengaging appended claims institute desire protection.
Claims (11)
1. a correlative value improvement method is applied on the display panel, and this method comprises the following step:
Provide a plurality of magnitudes of voltage to this display panel, make this display panel can produce the image frame of a plurality of different brightness values according to described a plurality of magnitudes of voltage respectively;
Detect a plurality of different brightness values of described a plurality of image frames that this display panel shows respectively; And
Selecting the corresponding magnitude of voltage of a predetermined value in described a plurality of brightness value for use is a crest voltage of this display panel.
2. correlative value improvement method as claimed in claim 1 wherein selects for use this magnitude of voltage to comprise the step that this crest voltage is stored in a storer for the method for this limiting voltage of this display panel.
3. a correlative value is improved device, is applied on the display panel, and this device comprises:
One controller is electrically connected on this display panel, and it provides a plurality of magnitudes of voltage to this display panel, makes this display panel can produce the image frame of a plurality of different brightness values according to described a plurality of magnitudes of voltage respectively; And
One photodetector, be electrically connected on this controller, convert corresponding a plurality of electric signal in order to a plurality of different brightness values that detect described a plurality of image frames that this display panel shows respectively and deliver to this controller, make this controller can select for use the corresponding magnitude of voltage of a predetermined value in described a plurality of brightness value to be a crest voltage of this display panel.
4. correlative value as claimed in claim 3 is improved device, and it also comprises a storer, in order to store this crest voltage.
5. correlative value as claimed in claim 4 is improved device, and wherein this storer is a nonvolatile memory.
6. correlative value as claimed in claim 3 is improved device, and this predetermined value in wherein said a plurality of brightness values is an extreme value.
7. correlative value as claimed in claim 6 is improved device, and this extreme value in wherein said a plurality of brightness values can be a minimum value or the maximal value in described a plurality of brightness value.
8. correlative value as claimed in claim 3 is improved device, and wherein this crest voltage can be a black voltage or white appliances pressure.
9. image display system comprises:
One LCD, it comprises a display panel, and this correlative value as claimed in claim 3 is improved device; And
One power supply unit is coupled to described display panel and provides power supply to described display panel.
10. image display system as claimed in claim 9, wherein said image display system are a mobile phone, a digital camera, a personal digital assistant, a notebook computer, a desk-top computer, a TV, a GPS, an automobile-used display, an aviation with display, a digital frame or a portable DVD player projector.
11. an image display system comprises:
One display panel;
One storer, this memory stores have this crest voltage of selecting through the described correlative value improvement of claim 1 method; And
One power supply unit is coupled to described display panel and provides power supply to described display panel.
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| CN 200810165763 CN101685593B (en) | 2008-09-23 | 2008-09-23 | Device and method for improving contrast value of display panel and image display system |
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| CN 200810165763 CN101685593B (en) | 2008-09-23 | 2008-09-23 | Device and method for improving contrast value of display panel and image display system |
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| CN101685593A CN101685593A (en) | 2010-03-31 |
| CN101685593B true CN101685593B (en) | 2013-07-17 |
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| CN111754932A (en) | 2019-09-11 | 2020-10-09 | 义明科技股份有限公司 | Electronic device and method for detecting ambient light |
| TWI734496B (en) * | 2019-09-11 | 2021-07-21 | 義明科技股份有限公司 | Electronic device and sensing ambient light method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1836269A (en) * | 2003-09-05 | 2006-09-20 | 安捷伦科技有限公司 | Display panel conversion data deciding method and measuring apparatus |
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| JPH04194818A (en) * | 1990-11-22 | 1992-07-14 | Casio Comput Co Ltd | Liquid crystal display control device |
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| CN1836269A (en) * | 2003-09-05 | 2006-09-20 | 安捷伦科技有限公司 | Display panel conversion data deciding method and measuring apparatus |
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Owner name: QIMEI ELECTRONIC CO LTD Free format text: FORMER NAME: TONGBAO OPTOELECTRONICS CO., LTD. Owner name: INNOLUX DISPLAY CORPORATION Free format text: FORMER NAME: QIMEI ELECTRONIC CO LTD |
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Address after: Miaoli County, Taiwan, China Patentee after: INNOLUX DISPLAY CORP. Address before: Miaoli County, Taiwan, China Patentee before: CHI MEI OPTOELECTRONICS CORP. Address after: Miaoli County, Taiwan, China Patentee after: CHI MEI OPTOELECTRONICS CORP. Address before: Miaoli County, Taiwan, China Patentee before: TOPPOLY OPTOELECTRONICS Corp. |