CN108932923B - Detection system and detection method of AMOLED - Google Patents
Detection system and detection method of AMOLED Download PDFInfo
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- CN108932923B CN108932923B CN201810720375.3A CN201810720375A CN108932923B CN 108932923 B CN108932923 B CN 108932923B CN 201810720375 A CN201810720375 A CN 201810720375A CN 108932923 B CN108932923 B CN 108932923B
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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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- 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]
- G09G3/3225—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] using an active matrix
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Abstract
The invention provides a detection system and a detection method of an AMOLED. According to the AMOLED detection system, the offset regulators and the gain regulators are arranged in the detection devices, so that the problems of origin offset difference and sampling gain difference of the analog-to-digital converters in each detection device are solved, the analog-to-digital converters in each detection device can provide a sampling code value corresponding to a sampling voltage signal within a voltage range, and the sampling code values provided by the analog-to-digital converters in each detection device corresponding to the same sampling voltage signal are the same, so that the analog-to-digital converters are accurately sampled, and the detection accuracy of the AMOLED is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a detection system and a detection method of an AMOLED.
Background
An Organic Light Emitting Diode (OLED) Display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, a viewing angle of approximately 180 °, a wide temperature range, flexible Display, large-area full color Display, and the like, and is considered as a Display device with the most potential for development.
The OLED display device may be classified into two major categories, i.e., direct addressing and Thin Film Transistor (TFT) Matrix addressing, of a Passive Matrix OLED (PMOLED) and an Active Matrix OLED (AMOLED) according to a driving manner. The AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a large-sized display device with high definition.
Since the threshold voltage of the driving thin film transistor in each pixel of the conventional large-sized AMOLED is different from the intrinsic conductivity factor and the light emitting coefficient of the organic light emitting diode, the luminance of the AMOLED display is non-uniform even if the gate-source voltage difference of the driving thin film transistor is the same, and therefore, the driving thin film transistor in each pixel is compensated by adopting an external detection compensation technology, and the uniformity of the luminance is improved. As shown in fig. 1, the conventional detection system of the AMOLED includes: a display panel 100 and a detection circuit 200 electrically connected to the display panel 100; the display panel 100 includes a plurality of display regions 101, each display region 101 including a plurality of pixels 102 arranged in an array; the detection device 200 includes a plurality of analog-to-digital converters (ADCs) 201 corresponding to the plurality of display regions 101, each ADC 201 being electrically connected to a plurality of pixels 102 in the corresponding display region 101; the gate-source voltage Vgs of the driving thin film transistor in the pixel 102 is sampled by the analog-to-digital converter 201, converted from an analog signal to a digital signal, and then compensated. However, the origin offset difference and the sampling gain difference exist among the analog-to-digital converters 201, when the analog-to-digital converters 201 sample the same voltage, the obtained sampling code value has a difference, which will reduce the detection accuracy of the AMOLED, and the sampling range of the analog-to-digital converter 201 with higher sampling accuracy is usually smaller, and if the voltage sampled by the analog-to-digital converter 201 exceeds the sampling range, the sampling data will be inaccurate.
Disclosure of Invention
The invention aims to provide a detection system of an AMOLED (active matrix/organic light emitting diode), which can solve the problems of origin offset difference and sampling gain difference of an analog-to-digital converter in each detection device, so that the analog-to-digital converter can sample accurately, and the detection accuracy of the AMOLED is improved.
The invention further aims to provide a detection method of the AMOLED, which solves the problems of origin offset difference and sampling gain difference of the analog-to-digital converter in each detection device, so that the analog-to-digital converter can sample accurately, and the detection accuracy of the AMOLED is improved.
In order to achieve the above object, the present invention further provides a detecting system of an AMOLED, including a plurality of detecting devices electrically connected to a display panel respectively;
each detection device comprises an offset adjuster connected with the display panel, a gain adjuster connected with the offset adjuster and an analog-digital converter connected with the gain adjuster;
the offset regulator is used for acquiring a sampling voltage signal, providing an offset regulating voltage to regulate the sampling voltage signal and outputting a first sampling voltage output signal, wherein the first sampling voltage output signal is within the voltage sampling range of the analog-to-digital converter;
the voltage sampling range of the analog-to-digital converter provides a sampling coding value for sampling voltage signals of the analog-to-digital converter, which are correspondingly within a voltage range;
the gain adjuster is used for acquiring a first sampling voltage output signal, providing a gain coefficient to adjust the first sampling voltage output signal, and outputting a second sampling voltage output signal to the analog-to-digital converter, so that the sampling code values provided by the analog-to-digital converters in each detection device corresponding to the same sampling voltage signal are the same.
When the sampling voltage signal is 0, the sampling code value provided by the analog-to-digital converter of each detection device corresponding to the same sampling voltage signal is 0.
The offset adjuster includes: the circuit comprises a first operational amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor;
the inverting input end of the first operational amplifier is electrically connected with the first end of the first resistor, the non-inverting input end of the first operational amplifier is electrically connected with the first end of the second resistor, and the output end of the first operational amplifier outputs a first sampling voltage output signal;
the second end of the first resistor is connected with an offset adjusting voltage;
a second end of the second resistor is connected with a sampling voltage signal;
two ends of the third resistor are respectively and electrically connected with the inverting input end and the output end of the first operational amplifier;
the first end of the fourth resistor is electrically connected with the non-inverting input end of the first operational amplifier, and the second end of the fourth resistor is grounded.
The gain adjuster includes: the second operational amplifier, the adjustable resistor and the sixth resistor;
the inverting input end of the second operational amplifier is electrically connected with the output end, the non-inverting input end of the second operational amplifier is electrically connected with the first end of the adjustable resistor, and the output end of the second operational amplifier outputs a second sampling voltage output signal;
the second end of the adjustable resistor is connected to a first sampling voltage output signal;
and the first end of the sixth resistor is electrically connected with the non-inverting input end of the second operational amplifier, and the second end of the sixth resistor is grounded.
The gain factor of the gain adjuster is
Where Ra is the resistance of the sixth resistor, and Rb is the resistance of the adjustable resistor.
The ratio range of the resistance value of the adjustable resistor to the resistance value of the sixth resistor is 0-1/9.
The display panel comprises a plurality of display areas corresponding to the plurality of detection devices respectively, each display area comprises a plurality of pixels arranged in an array mode, and the offset regulator in each detection device is electrically connected with the pixels in the corresponding display area to obtain a sampling voltage signal of each pixel.
The offset adjuster in each detection device is electrically connected with the driving thin film transistors in the plurality of pixels in the corresponding display area.
The sampling voltage signal is the grid-source voltage of the driving thin film transistor.
The invention also provides a detection method of the AMOLED, which is applied to the detection system of the AMOLED and comprises the following steps:
step S1, the offset regulator obtains a sampling voltage signal, provides an offset regulating voltage to regulate the sampling voltage signal, and outputs a first sampling voltage output signal, wherein the first sampling voltage output signal is within the voltage sampling range of the analog-to-digital converter;
the voltage sampling range of the analog-to-digital converter provides a sampling coding value for sampling voltage signals of the analog-to-digital converter, which are correspondingly within a voltage range;
step S2, the gain adjuster obtains the first sampling voltage output signal, provides a gain coefficient to adjust the first sampling voltage output signal, and outputs a second sampling voltage output signal to the analog-to-digital converter, so that the sampling code values provided by the analog-to-digital converters in each detection device corresponding to the same sampling voltage signal are the same.
The invention has the beneficial effects that: according to the AMOLED detection system, the offset regulators and the gain regulators are arranged in the plurality of detection devices, so that the problems of origin offset difference and sampling gain difference of the analog-to-digital converters in each detection device are solved, the analog-to-digital converters in each detection device can provide a sampling code value corresponding to the sampling voltage signals within a voltage range, and the sampling code values provided by the analog-to-digital converters in each detection device corresponding to the same sampling voltage signal are the same, so that the analog-to-digital converters can sample accurately, and the detection accuracy of the AMOLED is improved. The AMOLED detection method can solve the problems of origin offset difference and sampling gain difference of the analog-to-digital converter in each detection device, so that the analog-to-digital converter can sample accurately, and the detection accuracy of the AMOLED is improved.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a conventional AMOLED detection system;
FIG. 2 is a schematic diagram of a detection system of the AMOLED of the present invention;
fig. 3 is a schematic diagram of a detection device of the detection system of the AMOLED of the present invention;
FIG. 4 is a schematic diagram of the AMOLED detection system of the present invention for eliminating the difference of the origin offset and the difference of the sampling gain;
fig. 5 is a flowchart of a detection method of an AMOLED according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 2 and 4, the invention provides a detection system of an AMOLED, which includes a plurality of detection devices 20 electrically connected to the display panel 10 respectively;
each detecting device 20 comprises an offset adjuster 21 connected with the display panel 10, a gain adjuster 22 connected with the offset adjuster 21, and an analog-to-digital converter 23 connected with the gain adjuster 22;
the offset adjustor 21 is configured to obtain a sampled voltage signal Vin, provide an offset-adjusted voltage Voffset to adjust the sampled voltage signal Vin, and output a first sampled voltage output signal Vout1, where the first sampled voltage output signal Vout1 is within a voltage sampling range of the analog-to-digital converter 23;
the voltage sampling range of the analog-to-digital converter 23 is such that the analog-to-digital converter 23 can provide a sampling Code value Code corresponding to the sampling voltage signal Vin within a voltage range, that is, the sampling voltage signal Vin and the sampling Code value Code are in a linear relationship within a voltage range;
the gain adjuster 22 is configured to obtain a first sampling voltage output signal Vout1, provide a gain coefficient a to adjust the first sampling voltage output signal Vout1, and output a second sampling voltage output signal Vout2 to the analog-to-digital converter 23, so that the sampling Code values Code provided by the analog-to-digital converter 23 of each detection device 20 corresponding to the same sampling voltage signal Vin are the same, that is, the voltage sampling gains of the analog-to-digital converters 23 of each detection device 20 are the same.
It should be noted that, as shown in fig. 4, since the analog-to-digital converter 23 in each detecting device 20 has an origin offset difference, that is, when the sampled voltage signal Vin is 0, the analog-to-digital converter 23 in each detecting device 20 has an origin offset value corresponding to the sampled Code value Code provided by the sampled voltage signal Vin, so that the analog-to-digital converter 23 cannot provide a sampled Code value Code corresponding to the sampled voltage signal Vin within a voltage range, that is, the sampled voltage signal Vin exceeds the voltage sampling range of the analog-to-digital converter 23. The offset adjuster 21 provides an offset adjusting voltage Voffset to adjust the sampled voltage signal Vin, offset the origin offset value, and output a first sampled voltage output signal Vout1, i.e., Vout1 is Vin-Voffset, and the first sampled voltage output signal Vout1 is within the voltage sampling range of the adc 23, so that the adc 23 in each detecting device 20 can provide a sampled Code value corresponding to the sampled voltage signal Vin within a voltage range. Further, the analog-to-digital converter 23 in each of the detecting devices 20 has a sampling gain difference, that is, the analog-to-digital converter 23 in each of the detecting devices 20 provides different sampling Code values corresponding to the same sampling voltage signal Vin. The invention further provides a gain coefficient a through the gain adjuster 22 to adjust the first sampling voltage output signal Vout1, and outputs a second sampling voltage output signal Vout2 to the analog-to-digital converter 23, that is, Vout2 is Vout1 a, so that the voltage sampling gains of the analog-to-digital converters 23 in each detection device 20 are the same, that is, the sampling Code values Code provided by the analog-to-digital converters 23 in each detection device 20 corresponding to the same sampling voltage signal Vin are the same, so that the sampling of the analog-to-digital converters 23 is accurate, and the detection accuracy of the AMOLED is improved.
Preferably, the offset-adjusting voltage Voffset is equal to the origin offset value, i.e. when the sampled voltage signal Vin is 0, the analog-to-digital converter 23 in each detecting device 20 provides a sampling Code value Code corresponding to the same sampled voltage signal Vin.
Specifically, referring to fig. 3, the offset adjuster 21 includes: a first operational amplifier D1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
the inverting input terminal of the first operational amplifier D1 is electrically connected to the first terminal of the first resistor R1, the non-inverting input terminal is electrically connected to the first terminal of the second resistor R2, and the output terminal outputs a first sampled voltage output signal Vout 1;
a second end of the first resistor R1 is connected with an offset adjusting voltage Voffset;
a second end of the second resistor R2 is connected with a sampling voltage signal Vin;
two ends of the third resistor R3 are respectively and electrically connected with the inverting input end and the output end of the first operational amplifier D1;
the first end of the fourth resistor R4 is electrically connected to the non-inverting input terminal of the first operational amplifier D1, and the second end is grounded.
Specifically, referring to fig. 3, the gain adjuster 22 includes: a second operational amplifier D2, an adjustable resistor R5, and a sixth resistor R6;
the inverting input end of the second operational amplifier D2 is electrically connected to the output end, the non-inverting input end is electrically connected to the first end of the adjustable resistor R5, and the output end outputs a second sampling voltage output signal Vout 2;
the second end of the adjustable resistor R5 is connected to a first sampling voltage output signal Vout 1;
the first end of the sixth resistor R6 is electrically connected to the non-inverting input terminal of the second operational amplifier D2, and the second end is grounded.
Specifically, the gain factor A of the gain adjuster 22 is
Wherein, Ra is the resistance of the sixth resistor R6, and Rb is the resistance of the adjustable resistor R5. The magnitude of the gain coefficient A can be changed by adjusting the resistance value of the adjustable resistor R5, and in order to provide a higher-precision gain coefficient A, the ratio of the resistance value of the adjustable resistor R5 to the resistance value of the sixth resistor R6 is preferably in the range of 0-1/9, that is, the gain coefficient A is in the range of 0.9-1.
Specifically, the display panel 10 includes a plurality of display regions 11 corresponding to the plurality of detection devices 20, each display region 11 includes a plurality of pixels 12 arranged in an array, and the offset adjuster 21 in each detection device 20 is electrically connected to the plurality of pixels 12 in the corresponding display region 11 to obtain the sampling voltage signal Vin of each pixel 12.
Preferably, the offset adjuster 21 of each detecting device 20 is electrically connected to the driving tfts of the pixels 12 in the corresponding display area 11.
Preferably, the sampling voltage signal Vin is a gate-source voltage of the driving thin film transistor.
Referring to fig. 5, the present invention further provides a detection method of an AMOLED, applied to the detection system of the AMOLED, including the following steps:
step S1, the offset adjustor 21 obtains a sampling voltage signal Vin, provides an offset-adjusting voltage Voffset to adjust the sampling voltage signal Vin, and outputs a first sampling voltage output signal Vout1, where the first sampling voltage output signal Vout1 is within the voltage sampling range of the adc 23;
the voltage sampling range of the analog-to-digital converter 23 is such that the analog-to-digital converter 23 can provide a sampling Code value Code corresponding to the sampling voltage signal Vin within a voltage range, that is, the sampling voltage signal Vin and the sampling Code value Code are in a linear relationship within a voltage range;
in step S2, the gain adjuster 22 obtains the first sampled voltage output signal Vout1, provides a gain coefficient a to adjust the first sampled voltage output signal Vout1, and outputs a second sampled voltage output signal Vout2 to the analog-to-digital converter 23, so that the sampling Code values Code provided by the analog-to-digital converter 23 of each detection device 20 corresponding to the same sampled voltage signal Vin are the same, that is, the voltage sampling gains of the analog-to-digital converters 23 of each detection device 20 are the same.
It should be noted that, as shown in fig. 4, since the analog-to-digital converter 23 in each detecting device 20 has an origin offset difference, that is, when the sampled voltage signal Vin is 0, the analog-to-digital converter 23 in each detecting device 20 has an origin offset value corresponding to the sampled Code value Code provided by the sampled voltage signal Vin, so that the analog-to-digital converter 23 cannot provide a sampled Code value Code corresponding to the sampled voltage signal Vin within a voltage range, that is, the sampled voltage signal Vin exceeds the voltage sampling range of the analog-to-digital converter 23. The offset adjuster 21 provides an offset adjusting voltage Voffset to adjust the sampled voltage signal Vin, offset the origin offset value, and output a first sampled voltage output signal Vout1, i.e., Vout1 is Vin-Voffset, and the first sampled voltage output signal Vout1 is within the voltage sampling range of the adc 23, so that the adc 23 in each detecting device 20 can provide a sampled Code value corresponding to the sampled voltage signal Vin within a voltage range. Further, the analog-to-digital converter 23 in each of the detecting devices 20 has a sampling gain difference, that is, the analog-to-digital converter 23 in each of the detecting devices 20 provides different sampling Code values corresponding to the same sampling voltage signal Vin. The invention further provides a gain coefficient a through the gain adjuster 22 to adjust the first sampling voltage output signal Vout1, and outputs a second sampling voltage output signal Vout2 to the analog-to-digital converter 23, that is, Vout2 is Vout1 a, so that the voltage sampling gains of the analog-to-digital converters 23 in each detection device 20 are the same, that is, the sampling Code values Code provided by the analog-to-digital converters 23 in each detection device 20 corresponding to the same sampling voltage signal Vin are the same, so that the sampling of the analog-to-digital converters 23 is accurate, and the detection accuracy of the AMOLED is improved.
In summary, in the detection system of the AMOLED of the present invention, the offset adjusters and the gain adjusters are respectively disposed in the plurality of detection devices, so as to solve the problems of the origin offset difference and the sampling gain difference of the analog-to-digital converters in each detection device, so that the analog-to-digital converters in each detection device can provide a sampling code value corresponding to the sampling voltage signal within a voltage range, and the sampling code values provided by the analog-to-digital converters in each detection device corresponding to the same sampling voltage signal are the same, so that the sampling of the analog-to-digital converters is accurate, and the detection accuracy of the AMOLED is improved. The AMOLED detection method can solve the problems of origin offset difference and sampling gain difference of the analog-to-digital converter in each detection device, so that the analog-to-digital converter can sample accurately, and the detection accuracy of the AMOLED is improved.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. A detection system of AMOLED is characterized by comprising a plurality of detection devices (20) which are respectively electrically connected with a display panel (10);
each detection device (20) comprises an offset adjuster (21) connected with the display panel (10), a gain adjuster (22) connected with the offset adjuster (21) and an analog-to-digital converter (23) connected with the gain adjuster (22);
the offset regulator (21) is used for acquiring a sampling voltage signal (Vin), providing an offset regulating voltage (Voffset) to regulate the sampling voltage signal (Vin), and outputting a first sampling voltage output signal (Vout1), wherein the first sampling voltage output signal (Vout1) is within a voltage sampling range of the analog-to-digital converter (23);
the voltage sampling range of the analog-to-digital converter (23) is that the analog-to-digital converter (23) can provide a sampling Code value (Code) corresponding to a sampling voltage signal (Vin) within a voltage range;
the gain adjuster (22) is configured to obtain a first sampled voltage output signal (Vout1), provide a gain coefficient (a) to adjust the first sampled voltage output signal (Vout1), and output a second sampled voltage output signal (Vout2) to the analog-to-digital converter (23), so that the sampled Code values (Code) provided by the analog-to-digital converters (23) of each detection device (20) corresponding to the same sampled voltage signal (Vin) are the same;
the offset adjuster (21) includes: a first operational amplifier (D1), a first resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R4);
the inverting input end of the first operational amplifier (D1) is electrically connected with the first end of the first resistor (R1), the non-inverting input end of the first operational amplifier is electrically connected with the first end of the second resistor (R2), and the output end of the first operational amplifier outputs a first sampling voltage output signal (Vout 1);
a second end of the first resistor (R1) is connected with an offset adjusting voltage (Voffset);
a second end of the second resistor (R2) is connected to a sampling voltage signal (Vin);
two ends of the third resistor (R3) are respectively and electrically connected with the inverting input end and the output end of the first operational amplifier (D1);
the first end of the fourth resistor (R4) is electrically connected with the non-inverting input end of the first operational amplifier (D1), and the second end is grounded;
the gain adjuster (22) includes: a second operational amplifier (D2), an adjustable resistor (R5), and a sixth resistor (R6);
the inverting input end of the second operational amplifier (D2) is electrically connected with the output end, the non-inverting input end of the second operational amplifier is electrically connected with the first end of the adjustable resistor (R5), and the output end of the second operational amplifier outputs a second sampling voltage output signal (Vout 2);
a second end of the adjustable resistor (R5) is connected to a first sampled voltage output signal (Vout 1);
the first end of the sixth resistor (R6) is electrically connected with the non-inverting input end of the second operational amplifier (D2), and the second end is grounded.
2. The detection system of an AMOLED as claimed in claim 1, wherein when the sampled voltage signal (Vin) is 0, the analog-to-digital converter (23) of each detection device (20) provides a sampled Code value (Code) corresponding to the same sampled voltage signal (Vin) of 0.
3. The AMOLED detection system of claim 1, wherein the gain factor (A) of the gain adjuster (22) is
Where Ra is the resistance value of the sixth resistor (R6), and Rb is the resistance value of the adjustable resistor (R5).
4. The AMOLED detection system as claimed in claim 3, wherein the ratio of the resistance of the adjustable resistor (R5) to the resistance of the sixth resistor (R6) is in the range of 0-1/9.
5. The AMOLED detection system as claimed in claim 1, wherein the display panel (10) comprises a plurality of display regions (11) corresponding to the plurality of detection devices (20), each display region (11) comprises a plurality of pixels (12) arranged in an array, and the offset adjuster (21) of each detection device (20) is electrically connected to the plurality of pixels (12) of the corresponding display region (11) to obtain the sampling voltage signal (Vin) of each pixel (12).
6. The detection system of AMOLED as claimed in claim 5, wherein the offset adjuster (21) of each detection device (20) is electrically connected to the driving TFTs of the pixels (12) in the corresponding display area (11).
7. The detection system of an AMOLED according to claim 6, wherein the sampled voltage signal (Vin) is a gate-source voltage driving a TFT.
8. A detection method of AMOLED is applied to the detection system of AMOLED as claimed in any one of claims 1 to 7, and comprises the following steps:
step S1, the offset adjuster (21) obtains a sampled voltage signal (Vin), provides an offset adjustment voltage (Voffset) to adjust the sampled voltage signal (Vin), and outputs a first sampled voltage output signal (Vout1), where the first sampled voltage output signal (Vout1) is within a voltage sampling range of the analog-to-digital converter (23);
the voltage sampling range of the analog-to-digital converter (23) is that the analog-to-digital converter (23) can provide a sampling Code value (Code) corresponding to a sampling voltage signal (Vin) within a voltage range;
in step S2, the gain adjuster (22) obtains a first sampled voltage output signal (Vout1), provides a gain coefficient (a) to adjust the first sampled voltage output signal (Vout1), and outputs a second sampled voltage output signal (Vout2) to the analog-to-digital converter (23), such that the sampled Code values (codes) provided by the analog-to-digital converters (23) of each detection device (20) corresponding to the same sampled voltage signal (Vin) are the same.
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| CN201810720375.3A CN108932923B (en) | 2018-07-03 | 2018-07-03 | Detection system and detection method of AMOLED |
| PCT/CN2019/074898 WO2020007051A1 (en) | 2018-07-03 | 2019-02-13 | Amoled detection system and detection method |
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| CN201810720375.3A CN108932923B (en) | 2018-07-03 | 2018-07-03 | Detection system and detection method of AMOLED |
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| US5285302A (en) * | 1992-03-30 | 1994-02-08 | Industrial Technology Research Institute | TFT matrix liquid crystal display with compensation capacitance plus TFT stray capacitance constant irrespective of mask misalignment during patterning |
| JP3642343B2 (en) * | 1993-12-22 | 2005-04-27 | シャープ株式会社 | Display device drive circuit |
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| US6680755B2 (en) * | 2001-04-05 | 2004-01-20 | Industrial Technology Research Institute | Adjustable biased gamma-correction circuit with central-symmetry voltage |
| KR100571825B1 (en) * | 2003-11-28 | 2006-04-17 | 삼성전자주식회사 | Optical analyzer for improving resolution of time-varying spectrum and device therefor |
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| JP2010108501A (en) * | 2008-10-30 | 2010-05-13 | Samsung Electronics Co Ltd | Touch screen controller having increased sensing sensitivity, and display driving circuit and display device and system having the touch screen controller |
| US9154147B2 (en) * | 2013-03-15 | 2015-10-06 | Integrated Device Technology Inc. | Systems and methods for estimation of offset and gain errors in a time-interleaved analog-to-digital converter |
| CN103366706B (en) * | 2013-07-19 | 2016-03-30 | 深圳市华星光电技术有限公司 | A kind of voltage compensating circuit of gate drivers and method and liquid crystal indicator |
| KR101597037B1 (en) * | 2014-06-26 | 2016-02-24 | 엘지디스플레이 주식회사 | Organic Light Emitting Display For Compensating Electrical Characteristics Deviation Of Driving Element |
| CN106097943B (en) * | 2016-08-08 | 2018-06-01 | 深圳市华星光电技术有限公司 | OLED drives the threshold voltage method for detecting of thin film transistor (TFT) |
| KR102609508B1 (en) * | 2016-11-11 | 2023-12-04 | 엘지디스플레이 주식회사 | Driver Integrated Circuit For External Compensation And Display Device Including The Same |
| CN106603075B (en) * | 2016-11-18 | 2020-03-10 | 中国电子科技集团公司第四十一研究所 | Multi-ADC high-speed cross sampling calibration device and calibration method |
| CN108932923B (en) * | 2018-07-03 | 2020-09-01 | 深圳市华星光电半导体显示技术有限公司 | Detection system and detection method of AMOLED |
-
2018
- 2018-07-03 CN CN201810720375.3A patent/CN108932923B/en active Active
-
2019
- 2019-02-13 WO PCT/CN2019/074898 patent/WO2020007051A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| CN108932923A (en) | 2018-12-04 |
| WO2020007051A1 (en) | 2020-01-09 |
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