CN109346006B - OLED screen constant current source driving circuit - Google Patents
OLED screen constant current source driving circuit Download PDFInfo
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- CN109346006B CN109346006B CN201811176628.1A CN201811176628A CN109346006B CN 109346006 B CN109346006 B CN 109346006B CN 201811176628 A CN201811176628 A CN 201811176628A CN 109346006 B CN109346006 B CN 109346006B
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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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- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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Abstract
The application discloses OLED screen constant current source drive circuit. The technical scheme can distinguish the short circuit condition of the OLED screen body, the allowable elements have a certain amount of resistance value, when the OLED screen body has a pixel point short circuit fault, the voltage of the OLED screen body is not changed greatly because each pixel point is connected with a fusing type short circuit prevention structure, and the constant current source can maintain the constant current output state of the constant current source driving chip when detecting that the voltage measured value after the allowable elements are connected with the OLED pixels in series is larger than the preset voltage value; when the OLED screen body has other non-pixel point short circuit faults, the voltage at two ends of the OLED screen body is almost zero, even if an allowable element exists, the voltage measured value after the constant current source driving chip detects that the allowable element is connected with the OLED pixel in series is still lower than the preset value, at the moment, the constant current source driving chip detects the load short circuit condition, the output current is stopped, and other accidents are avoided.
Description
Technical Field
The disclosure particularly relates to an OLED screen constant current source driving circuit.
Background
In the prior art, most OLED screen body driving circuits are driven by a constant current source, and are generally realized by adopting a constant current source driving chip. The current practical constant current source driving chip is designed for the LED, and in view of the fact that the actual control driving of the LED is simple, only the situation of simple short circuit or open circuit exists, when the chip detects that the short circuit or the open circuit occurs in the circuit, the driving chip stops the supply of the current.
The structure and the light emitting principle of the OLED panel are specific, and particularly, the OLED panel having a fuse-type short circuit prevention structure is shown in fig. 7(a) and 7(b) disclosed in ZL 201280005126.7. Even so, under the condition that a certain pixel appears the short circuit, constant current drive chip can detect short circuit fault and stop current output, and the OLED short-circuit point of preventing the short circuit design can lose the chance of fusing "fuse", will lead to OLED product almost permanent failure, and this has also brought the technical problem for the constant current source drive of the OLED screen body, awaits the opportune moment and solves.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a constant current source driving circuit that is more adaptable to OLED panels than the prior art.
In a first aspect, an OLED panel constant current source driving circuit includes: the direct current input end is connected with the input end of the constant current source, and an allowable element and an OLED screen body are connected in series between the output end of the constant current source and the direct current output end.
According to the technical scheme provided by the embodiment of the application, the OLED screen body comprises a fusing type short-circuit prevention structure, and each pixel point is connected with at least one fusing type short-circuit prevention structure.
According to the technical scheme provided by the embodiment of the application, when the OLED screen body has a pixel point short-circuit fault, the detection voltages of the two ends of the allowable element and the OLED screen body are greater than the preset voltage in the constant current source; when other short-circuit faults occur in the OLED screen body, the detection voltage of the allowed element and the two ends of the OLED screen body is smaller than the preset voltage in the constant current source.
According to the technical scheme provided by the embodiment of the application, when N short-circuit points are reached, VShort length+VR﹤VSCWherein: vShort lengthAnd R I/N, the output of the constant current source is interrupted. (wherein: V)Short lengthThe voltage of two ends of the OLED screen body is the voltage when N short-circuit points occur; vRTo allow voltage across the device; r is the resistance value of the OLED screen body; vSCAnd I is preset voltage and current in the constant current source chip. )
According to the technical scheme provided by the embodiment of the application, the allowable element is a resistor or a Zener diode.
In the actual working process, the constant current source driving chip can detect the voltage values at two ends of the OLED screen body to obtain a detection voltage, the actual measurement value of the detection voltage is compared with the preset voltage, if the detection voltage is greater than or equal to the preset voltage value, the continuous constant current output current is kept, and the OLED screen body is kept in a continuous lighting state; if the detection voltage is smaller than the preset voltage value, the output current is stopped, and the OLED screen body fails.
However, the short circuit condition of the OLED panel is generally divided into two kinds, one is: the OLED screen body has a pixel point short-circuit fault; the second is that: when the first short-circuit fault occurs, the OLED screen body continues to operate without danger; when the second short-circuit fault occurs, the OLED screen body continues to operate and is in danger.
Under the current use condition, once any short circuit condition occurs to the OLED screen body, the constant current source stops outputting current, the OLED screen body fails, and the two conditions are not distinguished.
In the technical scheme, in the first case, when a pixel short-circuit fault occurs in the OLED screen, it is ensured that an actual measurement value of the detection voltage detected by the constant current source is greater than the preset value, and a state in which the constant current source keeps current output is maintained.
The technical means is as follows:
when the OLED screen body has a pixel point short-circuit fault, the constant current source detects that the voltage measured value after the permissible element is connected with the OLED pixel in series is greater than a preset voltage value, and the constant current output state of the constant current source driving chip can be maintained; when other short-circuit faults occur to the OLED screen body, the voltage at two ends of the OLED screen body is almost zero, even if the allowable element exists, the voltage measured value after the constant current source driving chip detects that the allowable element is connected with the OLED pixel in series is still lower than the preset value, and at the moment, the constant current source driving chip detects the load short-circuit condition and stops outputting the current to avoid other accidents.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an OLED screen constant current source driving circuit according to the present application;
fig. 2 is a schematic structural diagram of an OLED screen constant current source driving circuit according to the present application.
Reference numbers in the figures: 1. a constant current source driving chip; 2. an OLED screen body; 3. a series resistor; 4. a zener diode.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, the present embodiment discloses an OLED panel constant current source driving circuit, including: the direct current input end is connected with the input end of the constant current source, and an allowable element and an OLED screen body are connected in series between the output end of the constant current source and the direct current output end.
The allowable element has a certain resistance value and can be connected with the OLED screen body in series, when the OLED screen body has a pixel point short-circuit fault, the constant current source detects that the measured voltage value after the allowable element is connected with the OLED pixel in series is larger than the preset voltage value, and the constant current output state of the constant current source driving chip can be maintained.
The resistance value of the allowable element needs to be determined according to parameters such as the type of the OLED load, the output current of the constant current source, the preset voltage value and the like.
In any preferred embodiment, the OLED panel includes a fuse-type short-circuit prevention structure, and each pixel point is connected to at least one fuse-type short-circuit prevention structure. Based on the design, when the OLED screen body has a short-circuit fault, the OLED screen body can realize self-protection by virtue of the fusing type short-circuit prevention structure.
In any preferred embodiment, when a pixel point short-circuit fault occurs in the OLED screen, the voltages at the two ends of the allowed element and the OLED screen are greater than or equal to a preset voltage in the constant current source; when other short-circuit faults occur to the OLED screen body, the voltage of the allowed element and the voltage of the two ends of the OLED screen body are smaller than the preset voltage in the constant current source.
In any preferred embodiment, the tolerant element is a resistor or a zener diode. When the Zener diode is used, the sensitivity of the constant current source driving chip for detecting the short circuit of the OLED screen pixel point can be reduced.
When the allowable element is taken as the resistor, the specific determination process is as follows:
it is known that: the normal working voltage of the OLED screen body is V1When a pixel point is short-circuited, the voltage at two ends of the OLED is V2Voltage at full short-circuit of OLED is V3。
In addition, the following components are known: the constant current output current of the constant current source driving chip is I, and the preset voltage is VSC(the preset voltage value is a threshold voltage value for judging whether the load is short-circuited).
The procedure for calculating the voltage of the allowable element is as follows:
when a pixel point of the OLED screen body is short-circuited, in order to keep the constant current output state of the constant current source, the voltage value V at two ends of the allowable elementRShould be greater than or equal to (V)SC-V2)；
The constant current output current is: i, so that the resistance value of the allowable element is greater than or equal to (V)SC-V2)/I。
Examples are shown below:
it is known that: the normal working voltage of the OLED screen body is V1When a pixel point is short-circuited, the voltage at two ends of the OLED is V21V, voltage V when OLED is completely short-circuited3＝0.1V。
In addition, the following components are known: the constant current output current of the constant current source driving chip is 200mA, and the preset voltage is VSC1.3V (the preset voltage value is a threshold voltage value for determining whether the load is short-circuited).
The procedure for calculating the voltage of the allowable element is as follows:
when a pixel point of the OLED screen body is short-circuited, in order to keep the constant current output state of the constant current source, the voltage value V at two ends of the allowable elementRShould be greater than or equal to 0.3V;
the constant current output current is: 200mA, the resistance value of the allowable element is more than or equal to 1.5 omega. Take 2.5 Ω as an example:
1. the OLED works normally: the constant current source detects the measured voltage value after the allowable element is connected in series with the OLED pixel: v1+VR＝5.5V>And 1.3V, and the constant current source drives the chip to normally output.
2. The OLED has a short circuit of one pixel point: the constant current source detects the measured voltage value after the allowable element is connected in series with the OLED pixel: v2+VR＝1.5V>And 1.3V, and the constant current source drives the chip to normally output.
In the above embodiment, when a pixel point short-circuit fault occurs in the OLED screen, the voltages detected at the two ends of the allowed element and the OLED screen are greater than the preset voltage in the constant current source; when other short-circuit faults occur in the OLED screen body, the detection voltage of the allowed element and the two ends of the OLED screen body is smaller than the preset voltage in the constant current source.
The procedure for calculating the voltage of the allowable element is as follows:
when a pixel point of the OLED screen body is short-circuited, in order to keep the constant current output state of the constant current source, the voltage value V at two ends of the allowable elementRShould be greater than or equal to 0.3V; meanwhile, when the OLED screen body is completely short-circuited, in order to ensure that the constant current source can normally stop outputting, the voltage value V at two ends of the allowable elementRShould be less than 1.2V.
If the allowable component is a zener diode, its upper voltage is selected according to its model.
The constant current output current is: 200mA, the resistance value of the allowable element is more than or equal to 1.5 omega and less than 6 omega. Take 2.5 Ω as an example:
1. the OLED works normally: the constant current source detects the measured voltage value after the allowable element is connected in series with the OLED pixel: v1+VR＝5.5V>And 1.3V, and the constant current source drives the chip to normally output.
2. The OLED has a short circuit of one pixel point: the constant current source detects the measured voltage value after the allowable element is connected in series with the OLED pixel: v2+VR＝1.5V>And 1.3V, and the constant current source drives the chip to normally output.
3. The OLED is completely shorted: constant current source detection-allowable element connected in series with OLED pixelMeasured voltage value thereafter: v3+VR＝0.6V<And 1.3V, the constant current source drives the chip to stop outputting.
In any preferred embodiment, when N short circuit points are reached, VShort length+VR﹤VSCWherein: vShort lengthAnd R I/N, the output of the constant current source is interrupted. (wherein: V)Short lengthThe voltage of two ends of the OLED screen body is the voltage when N short-circuit points occur; vRTo allow voltage across the device; r is the resistance value of the OLED screen body; vSCAnd I is preset voltage and current in the constant current source chip. )
In this embodiment, it is assumed that the constant current source outputs a constant current I, the resistance of the OLED panel is R, the resistance of the panel is approximately R/N when the panel is short-circuited, and the voltage of the panel is V when the number of short-circuits of the pixel points is NShort length(R/N) I, allowing a voltage across the element of VRThen when VShort length+VR<When the chip short circuit detects the voltage, when N short circuit points appear, the constant current source output is interrupted, so that the display or illumination effect of the screen body is not influenced.
In summary, the following steps: the short circuit condition of the OLED screen is generally divided into two kinds, one is: the OLED screen body has a pixel point short-circuit fault; the second is that: the OLED screen body has other short-circuit faults, under the current use condition, once the OLED screen body has any short-circuit condition, the constant current source stops outputting current, the OLED screen body fails, and the two conditions are not distinguished.
In the technical scheme, in the first case, when a pixel short-circuit fault occurs in the OLED screen, it is ensured that an actual measurement value of the detection voltage detected by the constant current source is greater than the preset value, and a state in which the constant current source keeps current output is maintained.
The technical means is as follows: in the technical scheme, the allowable element is connected with the OLED screen body in series at the output end of the existing constant current source, so that the short circuit condition of the OLED screen body can be distinguished, the allowable element has a certain limit of resistance value, when the OLED screen body has a pixel point short circuit fault, because each pixel point is connected with a fusing type short circuit prevention structure, the voltage of the OLED screen body does not change greatly, the constant current source detects that the voltage measured value after the allowable element is connected with the OLED pixel in series is greater than the preset voltage value, and the constant current output state of the constant current source driving chip can be maintained; when the OLED screen body has other non-pixel point short circuit faults, the voltage at two ends of the OLED screen body is almost zero, even if an allowable element exists, the voltage measured value after the constant current source driving chip detects that the allowable element is connected with the OLED pixel in series is still lower than the preset value, at the moment, the constant current source driving chip detects the load short circuit condition, the output current is stopped, and other accidents are avoided.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (3)
1. The OLED screen constant current source driving circuit is characterized in that: the method comprises the following steps: the direct current input end is connected with the input end of the constant current source, and an allowable element and an OLED screen body are connected in series between the output end of the constant current source and the direct current output end; when the OLED screen body has a pixel point short-circuit fault, the voltages of the allowed element and the two ends of the OLED screen body are more than or equal to the preset voltage in the constant current source; when the OLED screen body has short-circuit faults of other non-pixel points, the voltages of the allowed elements and the two ends of the OLED screen body are smaller than the preset voltage in the constant current source; the OLED screen body comprises a fusing type short-circuit prevention structure, and each pixel point is connected with at least one fusing type short-circuit prevention structure.
2. The OLED screen constant current source driving circuit of claim 1, wherein: when N short-circuit points are reached, VShort length+VR﹤VSCWherein: vShort lengthThe constant current source output is interrupted; wherein: vShort lengthThe voltage of two ends of the OLED screen body is the voltage when N short-circuit points occur; vRTo allow voltage across the device; r is the resistance value of the OLED screen body; vSCAnd I is preset voltage and current in the constant current source chip.
3. The OLED screen constant current source driving circuit according to any one of claims 1 to 2, wherein: the allowing element is a resistor or a zener diode.
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| CN101436386B (en) * | 2007-11-15 | 2011-06-08 | 中华映管股份有限公司 | Driving device for backlight module |
| KR101276557B1 (en) * | 2010-12-14 | 2013-06-24 | 엘지디스플레이 주식회사 | Display device and driving method thereof |
| US9214510B2 (en) * | 2011-01-12 | 2015-12-15 | Universal Display Corporation | OLED lighting device with short tolerant structure |
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