CN105427797A - Drive circuit for automatic light adjustment of OLED display screen - Google Patents
Drive circuit for automatic light adjustment of OLED display screen Download PDFInfo
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- CN105427797A CN105427797A CN201510988499.6A CN201510988499A CN105427797A CN 105427797 A CN105427797 A CN 105427797A CN 201510988499 A CN201510988499 A CN 201510988499A CN 105427797 A CN105427797 A CN 105427797A
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- display screen
- oled display
- programmable potentiometer
- automatic light
- brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a drive circuit for automatic light adjustment of an OLED display screen. The drive circuit comprises a power supply conversion module, a programmable potentiometer, a controller and a photosensitive sensor; one end of the power supply conversion module is connected to an input power supply, and the other end of the power supply conversion module is connected to the OLED display screen; the two ends of the programmable potentiometer are connected to the two ends of a feedback resistor of the power supply conversion module respectively; the photosensitive sensor senses the brightness of the OLED display screen; the controller is configured to be electrically connected to the photosensitive sensor and the programmable potentiometer, so that the programmable potentiometer is adjusted according to the received brightness of the OLED display screen to change the brightness of the OLED display screen. According to the drive circuit for the automatic light adjustment of the OLED display screen, the defect that in the prior art, an active matrix display device cannot perform brightness light adjustment is overcome, and the automatic light adjustment of the OLED active matrix display device is achieved.
Description
Technical field
The present invention relates to the field with an automatic light meter of display screen, particularly, relate to for OLED display screen driving circuit with an automatic light meter.
Background technology
TFT-LCD with maturation compares, OLED (ORGANIC ELECTROLUMINESCENCE DISPLAYS technology) is the display of active illuminating, has the advantage such as high-contrast, wide viewing angle, fast response (1 μ s), high-luminous-efficiency, low operating voltage (3 ~ 10V), ultra-thin (thickness is less than 2mm).Utilize the Vehicular display device of OLED fabrication techniques, more frivolous charming outward appearance, the display of more excellent colour image quality, broader viewing scope and larger design flexibility can be had, the more important thing is that OLED environmental suitability will be superior to liquid crystal display far away, the temperature range that can tolerate reaches-40 ~ 85 DEG C of temperature ranges.And OLED is not leaded, can not to environment.
OLED display technique is different from traditional LCD display mode, without the need to backlight, adopts very thin coating of organic material and glass substrate, when have electric current by time, these organic materials will be luminous.And OLED display screen curtain can do lighter and thinner, visible angle is larger, and significantly can save electric energy.Therefore OLED display application has great advantage in automotive field.
OLED screen curtain is divided into passive-matrix (PMOLED) and active-matrix (AMOLED) two type.The cost of PMOLED display is lower, is also comparatively easy to manufacture.But resolution and screen updates frequency are then restricted.Most of OLED display all adopts passive-matrix now, but active matrix displays has the trend of accelerated growth gradually.The characteristics such as high color saturation, frivolous volume, high-contrast, fast-response time and low power consumption, facilitate the factor of this trend just.
Summary of the invention
The object of this invention is to provide a kind of driving circuit with an automatic light meter for OLED display screen, this is used for OLED display screen driving circuit with an automatic light meter and overcomes the problem that active matrix displays of the prior art cannot carry out brightness light modulation, achieves the with an automatic light meter of OLED active matrix displays.
To achieve these goals, the invention provides a kind of driving circuit with an automatic light meter for OLED display screen, this driving circuit comprises: power transfer module, programmable potentiometer, controller and light sensor, one end of described power transfer module is connected to input power, and the other end is connected to described OLED display screen; The two ends of described programmable potentiometer are connected to the two ends of the feedback resistance of described power transfer module; Described light sensor responds to the brightness of described OLED display screen; Described controller is configured to be electrically connected on described light sensor and described programmable potentiometer respectively, with programmable potentiometer according to the brightness adjustment of the OLED display screen received, to change the brightness of described OLED display screen.
Preferably, described power transfer module comprises: power conversion chip, feedback resistance and peripheral circuit, the pin of described power conversion chip is connected to described peripheral circuit, and be connected to described input power, and the output voltage of described power conversion chip is connected in described OLED display screen, and carry out dividing potential drop by feedback resistance.
Preferably, the power conversion chip of described power conversion chip to be model be LT3759HMSE.
Preferably, the programmable potentiometer of described programmable potentiometer to be model be AD5252BRU1, and the W1 port of described programmable potentiometer and B1 port are connected to the two ends of described feedback resistance.
Preferably, described controller is connected to described programmable potentiometer by I2C, to control the output of described programmable potentiometer.
Preferably, described light sensor is configured to be connected to described controller, converts digital quantity to the analog quantity of the brightness of the described OLED display screen collected by described light sensor.
Preferably, the display screen of described display screen to be model be SGF480800MS37-01.
By above-mentioned embodiment, the with an automatic light meter and driving of the OLED screen designed by the present invention, good stability, reliability are high.The change because of surround lighting is avoided to affect human viewable.The present invention changes along with the change of surround lighting, improves because OLED screen brightness fixes indefinite that surround lighting changes the impact that high light is not visible and brightness at night is higher caused.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the circuit diagram of the positive voltage transition diagram that a kind of driving circuit with an automatic light meter for OLED display screen of the present invention is described;
Fig. 2 is the circuit diagram of the negative voltage transition figure that a kind of driving circuit with an automatic light meter for OLED display screen of the present invention is described; And
Fig. 3 is the sample circuit of the light sensor that a kind of driving circuit with an automatic light meter for OLED display screen of the present invention is described.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of driving circuit with an automatic light meter for OLED display screen, this driving circuit comprises: power transfer module, programmable potentiometer, controller and light sensor, one end of described power transfer module is connected to input power, and the other end is connected to described OLED display screen; The two ends of described programmable potentiometer are connected to the two ends of the feedback resistance of described power transfer module; Described light sensor responds to the brightness of described OLED display screen; Described controller is configured to be electrically connected on described light sensor and described programmable potentiometer respectively, with programmable potentiometer according to the brightness adjustment of the OLED display screen received, to change the brightness of described OLED display screen.
With an automatic light meter and the driving of OLED screen designed by the present invention, good stability, reliability are high.The change because of surround lighting is avoided to affect human viewable.The present invention changes along with the change of surround lighting, improves because OLED screen brightness fixes indefinite that surround lighting changes the impact that high light is not visible and brightness at night is higher caused.
The input power that the present invention adopts is 3.7V, this voltage by LT3759HMSE power conversion chip and periphery configure resistance by 3.7V Power convert for the positive voltage required for driving for OLED screen as shown in Figure 1.The two ends of this configuration resistance are connected to W1 and the B1 port of programmable digital potentiometer.By I2C communication, controller carries out output digital regulation resistance being carried out to programming Control potentiometer.And then change configuration resistance.Power conversion chip LT3759HMSE, by the input of the PGOOD of its 6 pin of configuration, makes it produce negative voltage.As shown in Figure 2, the negative voltage of generation carries out negative voltage driving for-1.5V supplies OLED (SGF480800MS37-01) to circuit for generating negative voltage.The negative voltage formula that power conversion chip conversion exports is:
Vout(negative)＝-0.8V*(1+R2/R1)
R1, R2 value is 6.8K Ω.
The OLED screen brightness data that this invention utilizes light sensor to sample carries out inputing to controller LPC1788FET208, controller is according to the size of brightness value, undertaken carrying out data transmission with programmable digital potentiometer by I2C communication with Time Controller, change the output of potentiometer resistance, and then change the output voltage of power conversion chip.Reach the object automatically controlling OLED screen brightness.AD5252 precision is the digital regulation resistance of 8, and the potentiometer resistance precision of output is higher.OLED brightness change is more level and smooth.
Power conversion chip LT3759HMSE exports positive voltage formula:
Vout(positive)＝1.6V*(1+R2/R1)；
R2 value is 2K Ω,
R1 value is that digital regulation resistance exports:
Formula is: RWB (D)=(D/256) * RAB+75 Ω;
The RAB that AD5252 selects is 1K Ω,
D: for the digital quantity of AD5252 is defeated by by controller, in the present invention, OLED screen positive voltage driving voltage is 3.8V ~ 4.5V;
According to the span of formula (3) and (2) known D.
D span is 0x05 ~ 0XFF in the present invention:
In the embodiment of Fig. 3 of the present invention, light sensor S9674 is utilized to be connected to the P0_25 pin of controller.Gather the brightness data of OLED screen, sample circuit as shown in Figure 3.The analog quantity S9674_OUT collected is fed through controller and carries out AD conversion, when the screen brightness sampled or environmental light brightness lower time then by controller make digital regulation resistance resistance increase so that improve screen driving voltage increase screen brightness, otherwise reduce screen driving voltage.
Below in conjunction with accompanying drawing 1-accompanying drawing, 3 couples of the present invention are further detailed, and in the present invention, in order to improve the scope of application of the present invention, the following embodiment of special use realizes.
In a kind of embodiment of the present invention, as depicted in figs. 1 and 2, described power transfer module can comprise: power conversion chip, feedback resistance and peripheral circuit, the pin of described power conversion chip is connected to described peripheral circuit, and be connected to described input power, and the output voltage of described power conversion chip is connected in described OLED display screen, and carry out dividing potential drop by feedback resistance.Concrete peripheral circuit as depicted in figs. 1 and 2.
In this kind of embodiment, the power conversion chip of described power conversion chip to be model be LT3759HMSE.
In this kind of embodiment, the programmable potentiometer of described programmable potentiometer to be model be AD5252BRU1, and the W1 port of described programmable potentiometer and B1 port are connected to the two ends of described feedback resistance.
In a kind of embodiment of the present invention, described controller is connected to described programmable potentiometer by I2C, to control the output of described programmable potentiometer.
In this kind of embodiment, described light sensor is configured to be connected to described controller, converts digital quantity to the analog quantity of the brightness of the described OLED display screen collected by described light sensor.
In this kind of embodiment, the display screen of described display screen to be model be SGF480800MS37-01.
In the present invention, specific implementation:
Utilize in the present invention current sample values and last time sampled value contrast, if when current sample values and last time, sampled value had 3 digital magnitude variations, then currency is assigned to sampling last time, if when the digital quantity of sampled value is greater than 100, illustrate that brightness is higher, the digital quantity (D) writing digital regulation resistance is 0x05, if when the digital quantity of sampled value is between 70 to 100, the digital quantity (D) of write digital regulation resistance is 0x10, the like, under default situations, digital quantity is 0x60; Thus automatically change the numerical value of OLED screen driving voltage, reach object with an automatic light meter.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (7)
1. one kind for OLED display screen driving circuit with an automatic light meter, it is characterized in that, this driving circuit comprises: power transfer module, programmable potentiometer, controller and light sensor, and one end of described power transfer module is connected to input power, and the other end is connected to described OLED display screen; The two ends of described programmable potentiometer are connected to the two ends of the feedback resistance of described power transfer module; Described light sensor responds to the brightness of described OLED display screen; Described controller is configured to be electrically connected on described light sensor and described programmable potentiometer respectively, with programmable potentiometer according to the brightness adjustment of the OLED display screen received, to change the brightness of described OLED display screen.
2. the driving circuit with an automatic light meter for OLED display screen according to claim 1, it is characterized in that, described power transfer module comprises: power conversion chip, feedback resistance and peripheral circuit, the pin of described power conversion chip is connected to described peripheral circuit, and be connected to described input power, and the output voltage of described power conversion chip is connected in described OLED display screen, and carry out dividing potential drop by feedback resistance.
3. the driving circuit with an automatic light meter for OLED display screen according to claim 2, is characterized in that, the power conversion chip of described power conversion chip to be model be LT3759HMSE.
4. the driving circuit with an automatic light meter for OLED display screen according to claim 1, it is characterized in that, the programmable potentiometer of described programmable potentiometer to be model be AD5252BRU1, and the W1 port of described programmable potentiometer and B1 port are connected to the two ends of described feedback resistance.
5. the driving circuit with an automatic light meter for OLED display screen according to claim 1, is characterized in that, described controller is connected to described programmable potentiometer by I2C, to control the output of described programmable potentiometer.
6. the driving circuit with an automatic light meter for OLED display screen according to claim 1, it is characterized in that, described light sensor is configured to be connected to described controller, converts digital quantity to the analog quantity of the brightness of the described OLED display screen collected by described light sensor.
7. the driving circuit with an automatic light meter for OLED display screen according to claim 1, is characterized in that, the display screen of described display screen to be model be SGF480800MS37-01.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510988499.6A CN105427797A (en) | 2015-12-24 | 2015-12-24 | Drive circuit for automatic light adjustment of OLED display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510988499.6A CN105427797A (en) | 2015-12-24 | 2015-12-24 | Drive circuit for automatic light adjustment of OLED display screen |
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| CN105427797A true CN105427797A (en) | 2016-03-23 |
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| CN201510988499.6A Pending CN105427797A (en) | 2015-12-24 | 2015-12-24 | Drive circuit for automatic light adjustment of OLED display screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10699675B2 (en) | 2017-06-30 | 2020-06-30 | Kunshan Go-Visionox Opto-Electronics Co., Ltd. | Methods, apparatus, and storage media for dimming a display screen |
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| US20100117946A1 (en) * | 2008-11-10 | 2010-05-13 | Au Optronics (Suzhou) Corp. | Brightness adjustable electrical apparatus |
| CN103606366A (en) * | 2013-11-08 | 2014-02-26 | 桂林机床电器有限公司 | Outdoor display screen brightness self adjusting method |
| CN104540295A (en) * | 2015-01-06 | 2015-04-22 | 中航华东光电有限公司 | OLED brightness adjusting system based on FPGA and digital potentiometer |
| CN105243990A (en) * | 2015-10-12 | 2016-01-13 | 中航华东光电有限公司 | Driving circuit and automatic light modulation method for OLED display screen |
-
2015
- 2015-12-24 CN CN201510988499.6A patent/CN105427797A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100117946A1 (en) * | 2008-11-10 | 2010-05-13 | Au Optronics (Suzhou) Corp. | Brightness adjustable electrical apparatus |
| CN103606366A (en) * | 2013-11-08 | 2014-02-26 | 桂林机床电器有限公司 | Outdoor display screen brightness self adjusting method |
| CN104540295A (en) * | 2015-01-06 | 2015-04-22 | 中航华东光电有限公司 | OLED brightness adjusting system based on FPGA and digital potentiometer |
| CN105243990A (en) * | 2015-10-12 | 2016-01-13 | 中航华东光电有限公司 | Driving circuit and automatic light modulation method for OLED display screen |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10699675B2 (en) | 2017-06-30 | 2020-06-30 | Kunshan Go-Visionox Opto-Electronics Co., Ltd. | Methods, apparatus, and storage media for dimming a display screen |
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Application publication date: 20160323 |