CN100414598C - Method and device for correcting white balance of organic luminous display - Google Patents
Method and device for correcting white balance of organic luminous display Download PDFInfo
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- CN100414598C CN100414598C CNB031574165A CN03157416A CN100414598C CN 100414598 C CN100414598 C CN 100414598C CN B031574165 A CNB031574165 A CN B031574165A CN 03157416 A CN03157416 A CN 03157416A CN 100414598 C CN100414598 C CN 100414598C
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Abstract
The present invention relates to a method and a device for modifying the white balance of organic light-emitting displays. In an organic red light-emitting diode, an organic green light-emitting diode and an organic blue light-emitting diode, the organic light-emitting diode with the largest brightness decay rate is used as a standard, and the color gradation number of a display signal output to the other two organic light-emitting diodes by a drive circuit is adjusted and descended so as to recover a white balance point prearranged by a display.
Description
Technical field
The present invention relates to a kind of method and device of revising the organic light emitting display white balance, especially the white balance that decay is caused at the luminous organic material luminosity departs from the method for revising.
Background technology
Organic light emitting display (Organic Electroluminescence Display, OLED, OrganicEL Display) claims Organic Light Emitting Diode (Organic Light Emitting Diode again; OLED) display, owing to have the characteristic of high brightness, fast, compact, full-color, the no subtense angle of screen reaction velocity and low power consumption, therefore can replace conventional liquid crystal, and become the display device that portable information product of new generation, mobile phone, personal digital assistant device and portable computer generally use.
Organic light emitting display is to utilize the redgreenblue picture element, and allotment is to reach the purpose of full-color demonstration mutually.Produce deviation for fear of display color, in display, the brightness ratio of redgreenblue picture element must maintain certain ratio, just maintains on the preset white balance point (White Balance).
Number increases during along with use, and the luminosity of redgreenblue luminous organic material reduces gradually.Because this three colour organic luminous material, luminescence efficiency fall off rate of number when using is not quite similar, and, in the use of display, the redgreenblue luminous organic material, frequency of utilization also may not be identical, thereby cause the brightness ratio of redgreenblue picture element to depart from the preset white balance point, and influence the correctness of display color.
Use with the passing of time in order to solve above-mentioned organic light emitting display, display color produces wrong problem, be to utilize the power supply supply that increases Organic Light Emitting Diode traditionally, improve the part light emitting diode of display brightness deficiency, with the brightness ratio of adjustment redgreenblue picture element, and recover the preset white balance point.Please refer to Fig. 1, show the circuit structure of the single picture element of a typical organic light emitting display.Shows signal is imported by signal end 7, and is stored to a storage capacitors 2 via a first transistor 1, and transistor seconds 3 and Organic Light Emitting Diode 4 are to be serially connected with between power end 5 and the earth terminal 6.Above-mentioned storage capacitors 2 is the grids that are connected to transistor seconds 3, uses the current value of control by above-mentioned Organic Light Emitting Diode 4, that is controls the luminosity of this Organic Light Emitting Diode 4, shows with the GTG that determines this picture element.
When display departs from the preset white balance point, attenuation rate by the three picture element brightness of luminance sensor detecting RGB, and, with the minimum color of brightness decay rate as benchmark, increase the operating voltage of all the other two look picture element power ends 5, the luminosity of using the redgreenblue picture element is adjusted to default proportionate relationship, to recover white balance point originally.
Yet above-mentioned increase operating voltage except the power consumption that causes display increases, simultaneously, also increases the load of display module (such as thin film transistor (TFT) and Organic Light Emitting Diode) to revise the method for white balance point.Wherein, especially accelerated the aging speed of luminous organic material.And the aging luminescence efficiency that causes of luminous organic material reduces, and will cause white balance point to depart from again, and must further improve operating voltage revising white balance point, thereby forms a vicious cycle, causes significantly shorten the tenure of use of display.
In view of this, the present invention proposes a kind of diverse ways, to revise the white balance point of organic light emitting display, to keep original life-span of display.
Summary of the invention
The objective of the invention is using day long afterwards at organic light emitting display, luminous organic material brightness decay speed difference wherein causes white balance point to produce skew and causes the error of display color, revises, and keeps the original mission life of display simultaneously.
Above-mentioned purpose of the present invention is realized by following technical scheme.
Scheme one
A kind of method of revising the organic light emitting display white balance, it is characterized in that: in the redgreenblue Organic Light Emitting Diode, brightness decay rate the maximum is a benchmark, downgrade driving circuit and import the color range number of other this Organic Light Emitting Diode shows signal of two looks, to reduce the brightness of this Organic Light Emitting Diode, recover display preset white balance point, this driving circuit is the driving circuit of a multidigit, so that the shows signal output of a plurality of different color ranges to be provided.
The method of described correction organic light emitting display white balance is characterized in that: this driving circuit exports this Organic Light Emitting Diode shows signal of other two look to, is to downgrade according to the relative scale of this three colour organic luminous diodes brightness decay rate relation.
Scheme two
A kind of method of revising the organic light emitting display white balance, it is characterized in that: in the redgreenblue Organic Light Emitting Diode, brightness decay the maximum is a benchmark, and according to the ratio of the brightness decay rate of other this Organic Light Emitting Diode of two looks and this benchmark, downgrade driving circuit and export the color range number of other this Organic Light Emitting Diode shows signal of two looks to, to reduce the brightness of this Organic Light Emitting Diode, recover display preset white balance point, this driving circuit is the driving circuit of a multidigit, so that the shows signal output of a plurality of different color ranges to be provided.
The present invention also provides a kind of device of revising the organic light emitting display white balance, uses and recovers display preset white balance point, it is characterized in that comprising:
One luminance detection module is in order to the brightness decay rate separately of detecting redgreenblue Organic Light Emitting Diode;
One control circuit, be connected to this luminance detection module, to capture the brightness decay rate of this three colour organic luminous diode, and be benchmark with this three colour organic luminous diodes brightness decay rate the maximum, calculate the proportionate relationship of the brightness decay rate of other this Organic Light Emitting Diode of two looks and this benchmark, to produce a control signal; And
One drive circuit, be connected to this control circuit to capture this control signal, and use and downgrade the color range number that exports other this Organic Light Emitting Diode shows signal of two looks to, to reduce the brightness of this Organic Light Emitting Diode, recover display preset white balance point, this driving circuit is the driving circuit of a multidigit, so that the shows signal output of a plurality of different color ranges to be provided.
The device of described correction organic light emitting display white balance, it is characterized in that: more comprise a brightness color range table of comparisons, this brightness color range table of comparisons shows in order to recover the preset white balance point, the relation of the required color range number that downgrades of this three colour organic luminous diodes brightness decay rate and this shows signal.
The device of described correction organic light emitting display white balance is characterized in that: more comprise a brightness color range table of comparisons, this driving circuit exports the shows signal intensity of other this Organic Light Emitting Diode of two looks to, is according to this brightness color range table of comparisons adjustment.
The method of correction organic light emitting display white balance of the present invention, be with in the redgreenblue Organic Light Emitting Diode, brightness decay is benchmark than maximum Organic Light Emitting Diode, and according to other two colour organic luminous diode and above-mentioned Organic Light Emitting Diode as benchmark, the proportionate relationship of its relative brightness attenuation ratio, downgrade the color range number of above-mentioned other the two colour organic luminous diodes shows signal of driving circuit input, use and recover display preset white balance point.
Compared to the modification method of traditional organic light emitting display white balance, the present invention has following advantage:
One, the method for correction white balance of the present invention is with in the redgreenblue Organic Light Emitting Diode, and brightness surplus ratio reckling is for revising benchmark, and carries out in the mode of the color range number that reduces shows signal, therefore, can prevent the increase of display power consumption.
Two, by the method for correction white balance of the present invention, can alleviate the load of display module (such as thin film transistor (TFT) and Organic Light Emitting Diode), especially can avoid the aging speed of luminous organic material to speed, to keep the tenure of use of display.
Can be further understood in conjunction with the accompanying drawings by following specific embodiment about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the circuit structure of the single picture element of a typical organic light emitting display.
Fig. 2 is device one preferred embodiment of correction organic light emitting display white balance of the present invention.
Fig. 3 is another embodiment of device of correction organic light emitting display white balance of the present invention.
Embodiment
Please refer to Fig. 2, show apparatus and method one preferred embodiment of correction organic light emitting display white balance of the present invention.At first, the luminosity of one luminance detection module, 10 detecting redgreenblue Organic Light Emitting Diodes 40, calculating the brightness surplus ratio r of each colour organic luminous diode 40, g, b (being defined as light emitting diode 40 residue brightness) compared to the dispatch from the factory proportionate relationship of default brightness of display.At this is to suppose that the brightness surplus ratio r of red Organic Light Emitting Diode 40a is minimum.
Subsequently, luminance detection module 10 is sent to a control circuit 20 with this result of calculation.This control circuit 20 is with a comparing unit 22, redgreenblue Organic Light Emitting Diode 40a relatively, and 40b, 40c brightness surplus ratio r, g, the size of b, and, with the correction benchmark of the minimum red Organic Light Emitting Diode 40a of brightness surplus ratio as white balance.Subsequently,, calculate other turquoise two colour organic luminous diode 40b by a computing unit 24, the brightness surplus ratio g of 40c, b is with the relative scale g/r of brightness surplus ratio r, b/r.And by color stage converting unit 26, relative scale g/r and b/r according to above-mentioned brightness surplus ratio calculate above-mentioned turquoise two colour organic luminous diode 40b, 40c, and the color range that must downgrade is counted x, y.Subsequently, driving circuit 30 downgrades color range according to this and counts x, and y revises and exports above-mentioned turquoise Organic Light Emitting Diode 40b to, and the color range number of 40c shows signal is to recover display preset white balance point.
It should be noted that to be by the operating voltage that increases power end 5 traditionally, to revise the white balance deviation of display simultaneously with reference to Fig. 1.And the present invention is by the color range number that downgrades signal end 7 input image element structure shows signal, and not to adjusting via the operating voltage of power end 5 inputs.
Illustrate, if the luminance detection module 10 redgreenblue Organic Light Emitting Diode 40 that detects, its brightness decay rate is respectively 40%, 30% and 20%, that is to say its brightness surplus ratio r, and g, b are respectively 60%, 70% and 80%.Because the brightness surplus ratio r of red Organic Light Emitting Diode 40a is minimum, therefore, red Organic Light Emitting Diode 40a is the correction benchmark as white balance.In the case, to calculate green proportionate relationship g/r with red oled luminance surplus ratio be 1.17, the proportionate relationship b/r of blue and red oled luminance surplus ratio is 1.33.Generally speaking, because the luminosity of Organic Light Emitting Diode 40 has high-positive correlation with the current value of this Organic Light Emitting Diode 40 of flowing through, therefore, input to the color range number of green organic light emitting diode (LED) 40b shows signal by downgrading driving circuit 30, make the current value of the Organic Light Emitting Diode 40b that flows through reduce to originally 86% (just 1/1.17), and, downgrade the color range number that inputs to blue Organic Light Emitting Diode 40c shows signal, make the current value of the Organic Light Emitting Diode 40c that flows through reduce to originally 75% (just 1/1.33), can recover the luminosity ratio of redgreenblue Organic Light Emitting Diode 40 originally, to revise departing from of white balance point.
For the correction that makes white balance point more accurate, please refer to Fig. 3, with regard to a preferred embodiment, control circuit 20 has a brightness color range table of comparisons 28, the brightness surplus ratio r of red green and blue three colour organic luminous diodes, g, the required color range that downgrades of the corresponding shows signal with it of b is counted x, the contrast relationship of y.This brightness color range table of comparisons 28 is to obtain by the luminosity of actual measurement redgreenblue Organic Light Emitting Diode and the corresponding relation of color range number, thereby reference more accurately can be provided.
Under the minimum situation of brightness surplus ratio r of the red Organic Light Emitting Diode 40a of supposition.Color range converting unit 27 is according to from luminance detection module 10, the redgreenblue Organic Light Emitting Diode 40 brightness decay rate r that obtained, g, b is connected to the above-mentioned brightness color range table of comparisons 28, to obtain turquoise two colour organic luminous diode 40b, the required color range that downgrades of 40c is counted x, y.And driving circuit 30 is according to x, and y downgrades and exports above-mentioned turquoise two colour organic luminous diode 40b to, and the color range number of 40c shows signal is used and recovered display preset white balance point.
The above is to utilize preferred embodiment to describe the present invention in detail, but not limit the scope of the invention, and know this type of skill personage and all can understand, suitably do slightly change and adjustment, will not lose main idea of the present invention place, also not break away from the spirit and scope of the present invention.
Claims (6)
1. method of revising the organic light emitting display white balance, it is characterized in that: in the redgreenblue Organic Light Emitting Diode, brightness decay rate the maximum is a benchmark, downgrade driving circuit and import the color range number of other this Organic Light Emitting Diode shows signal of two looks, to reduce the brightness of this Organic Light Emitting Diode, recover display preset white balance point, this driving circuit is the driving circuit of a multidigit, so that the shows signal output of a plurality of different color ranges to be provided.
2. according to the method for the described correction organic light emitting display of claim 1 white balance, it is characterized in that: this driving circuit exports this Organic Light Emitting Diode shows signal of other two look to, is to downgrade according to the relative scale of this three colour organic luminous diodes brightness decay rate relation.
3. method of revising the organic light emitting display white balance, it is characterized in that: in the redgreenblue Organic Light Emitting Diode, brightness decay the maximum is a benchmark, and according to the ratio of the brightness decay rate of other this Organic Light Emitting Diode of two looks and this benchmark, downgrade driving circuit and export the color range number of other this Organic Light Emitting Diode shows signal of two looks to, to reduce the brightness of this Organic Light Emitting Diode, recover display preset white balance point, this driving circuit is the driving circuit of a multidigit, so that the shows signal output of a plurality of different color ranges to be provided.
4. a device of revising the organic light emitting display white balance is used and is recovered display preset white balance point, it is characterized in that comprising:
One luminance detection module is in order to the brightness decay rate separately of detecting redgreenblue Organic Light Emitting Diode;
One control circuit, be connected to this luminance detection module, to capture the brightness decay rate of this three colour organic luminous diode, and be benchmark with this three colour organic luminous diodes brightness decay rate the maximum, calculate the proportionate relationship of the brightness decay rate of other this Organic Light Emitting Diode of two looks and this benchmark, to produce a control signal; And
One drive circuit, be connected to this control circuit to capture this control signal, and use and downgrade the color range number that exports other this Organic Light Emitting Diode shows signal of two looks to, to reduce the brightness of this Organic Light Emitting Diode, recover display preset white balance point, this driving circuit is the driving circuit of a multidigit, so that the shows signal output of a plurality of different color ranges to be provided.
5. the device of correction organic light emitting display white balance according to claim 4, it is characterized in that: more comprise a brightness color range table of comparisons, this brightness color range table of comparisons shows in order to recover the preset white balance point, the relation of the required color range number that downgrades of this three colour organic luminous diodes brightness decay rate and this shows signal.
6. the device of correction organic light emitting display white balance according to claim 4, it is characterized in that: more comprise a brightness color range table of comparisons, this driving circuit exports the shows signal intensity of other this Organic Light Emitting Diode of two looks to, is according to this brightness color range table of comparisons adjustment.
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| CNB031574165A CN100414598C (en) | 2003-09-19 | 2003-09-19 | Method and device for correcting white balance of organic luminous display |
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| CNB031574165A CN100414598C (en) | 2003-09-19 | 2003-09-19 | Method and device for correcting white balance of organic luminous display |
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| CN100414598C true CN100414598C (en) | 2008-08-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9626775B1 (en) | 2015-11-12 | 2017-04-18 | Qualcomm Incorporated | White point calibration and gamut mapping for a display |
| US9659388B1 (en) | 2015-11-12 | 2017-05-23 | Qualcomm Incorporated | White point calibration and gamut mapping for a display |
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| CN100446069C (en) * | 2005-08-08 | 2008-12-24 | 友达光电股份有限公司 | Color adjusting device of electroluminescence display |
| CN101295465B (en) * | 2007-04-27 | 2010-12-22 | 深圳市同洲电子股份有限公司 | LED caducity emendation method and device |
| JP2011013340A (en) * | 2009-06-30 | 2011-01-20 | Hitachi Displays Ltd | Light-emitting element display device and display method |
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| CN103745688B (en) * | 2014-01-02 | 2016-01-27 | 青岛海信电器股份有限公司 | A kind of display of organic electroluminescence and display packing thereof |
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| CN110196529B (en) * | 2019-03-19 | 2021-04-30 | 深圳市中科创激光技术有限公司 | Light source control system and control method |
| CN109980499A (en) * | 2019-04-15 | 2019-07-05 | 北京镭创高科光电科技有限公司 | The white balance adjusting method and system of RGB laser light source |
| CN114360444A (en) * | 2021-12-06 | 2022-04-15 | 深圳市艾比森光电股份有限公司 | LED display screen system and correction method thereof |
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| US5315378A (en) * | 1991-11-06 | 1994-05-24 | Matsushita Electric Industrial Co. Ltd. | Gamma correction and white balance adjustment method and apparatus for projection display |
| US6043797A (en) * | 1996-11-05 | 2000-03-28 | Clarity Visual Systems, Inc. | Color and luminance control system for liquid crystal projection displays |
| US6069676A (en) * | 1996-08-02 | 2000-05-30 | Citizen Electronics Co., Ltd. | Sequential color display device |
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2003
- 2003-09-19 CN CNB031574165A patent/CN100414598C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5315378A (en) * | 1991-11-06 | 1994-05-24 | Matsushita Electric Industrial Co. Ltd. | Gamma correction and white balance adjustment method and apparatus for projection display |
| US6069676A (en) * | 1996-08-02 | 2000-05-30 | Citizen Electronics Co., Ltd. | Sequential color display device |
| US6043797A (en) * | 1996-11-05 | 2000-03-28 | Clarity Visual Systems, Inc. | Color and luminance control system for liquid crystal projection displays |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9626775B1 (en) | 2015-11-12 | 2017-04-18 | Qualcomm Incorporated | White point calibration and gamut mapping for a display |
| US9659388B1 (en) | 2015-11-12 | 2017-05-23 | Qualcomm Incorporated | White point calibration and gamut mapping for a display |
| US9934595B2 (en) | 2015-11-12 | 2018-04-03 | Qualcomm Incorporated | White point calibration and gamut mapping for a display |
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| CN1598918A (en) | 2005-03-23 |
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