CN110070814B - OLED display panel, light attenuation detection method thereof and display device - Google Patents
OLED display panel, light attenuation detection method thereof and display device Download PDFInfo
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Abstract
The invention discloses an OLED display panel, a light attenuation detection method thereof and a display device, relates to the technical field of display, and achieves the purposes of eliminating the interference of temperature on the brightness detection of a light emitting layer and accurately detecting the actual light emitting condition of the light emitting layer of a pixel unit on the premise of not increasing the volume of a detection device. The main technical scheme of the invention is as follows: a light emitting layer including a pixel region corresponding to the pixel unit and a detection region outside the pixel region; the photoelectric conversion device is arranged in the detection area and used for receiving the optical signal emitted by the light emitting layer and converting the received optical signal into an electrical signal; and the light incident side of the photoelectric conversion device is provided with an electric control light shielding layer for converting between a transparent state and a non-transparent state.
Description
Technical Field
The invention relates to the technical field of display, in particular to an OLED display panel, a light attenuation detection method thereof and a display device.
Background
The OLED has many advantages such as active light emission, fast response speed, low voltage driving, low power consumption, full solid structure, ultra-thin and ultra-thin, wide viewing angle, and large usable temperature range, and each pixel of the OLED emits light independently, and the light emission intensity is controlled by current. The current difference caused by the TFT switching characteristic difference can be compensated by an external electrical mode; the aging of the light emitting layer is a continuous process, so that the brightness of the pixel needs to be continuously monitored and compensated according to the real-time change of the brightness of the pixel.
The existing detection mode is as follows: the photodiode is used for converting an optical signal of the OLED into an electrical signal, but during the detection process, the photodiode generates a thermal current due to heat of the light-emitting layer, so that the converted electrical signal has a deviation from an electrical signal (photocurrent) corresponding to light emission of the light-emitting layer, and thus subsequent compensation has a deviation.
The solution for the above-mentioned electrical signal detection deviation in the prior art is: increase the temperature detection device in original detection device outside, but the temperature detection device that additionally increases can increase the whole volume of detection device, influences the pixel aperture opening ratio, can increase OLED circuit's complexity simultaneously, is unfavorable for display device's high pixel density to set up the demand.
Disclosure of Invention
In view of this, embodiments of the present invention provide a light decay detection apparatus and a detection method, which mainly aim to eliminate the interference of temperature on the brightness detection of the light emitting layer without increasing the volume of the detection device, so as to achieve the purpose of accurately detecting the actual light emitting condition of the light emitting layer of the pixel unit.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides an OLED display panel, including: a light emitting layer including a pixel region corresponding to a pixel unit and a detection region outside the pixel region;
the photoelectric conversion device is arranged in the detection area and used for receiving optical signals emitted by the light emitting layer and converting the received optical signals into electric signals;
the photoelectric conversion device comprises a photoelectric conversion device and is characterized in that an incident side of the photoelectric conversion device is provided with an electric control shading layer for converting a transparent state and a non-transparent state.
Optionally, the photoelectric conversion device includes a first electrode, a second electrode, and a photodiode disposed between the first electrode and the second electrode; the first electrode is arranged to be conductive metal, and the first electrode is arranged on the display substrate in a stacked mode; the second electrode is arranged as a transparent electrode and is used for transmitting an optical signal of the light-emitting layer; the photodiode is used for receiving an optical signal and converting the optical signal into an electric signal.
Optionally, the photoelectric conversion device is disposed corresponding to the light emitting layer of each of the pixel units;
alternatively, the photoelectric conversion device is provided corresponding to the light emitting layers of a plurality of the pixel units.
Optionally, the method further includes: and the source electrode of the first thin film transistor is connected with the first electrode and is used for driving the photodiode.
Optionally, the electrically controlled shading layer is made of an electrochromic material; the electric control shading layer is in a transparent state when no electric signal is applied, and the electric control shading layer is in a non-transparent state when the electric signal is applied.
Optionally, the source of the second thin film transistor is connected to the electrically controlled light shielding layer, and is configured to drive the electrically controlled light shielding layer.
On the other hand, an embodiment of the present invention further provides a light attenuation detection method for an OLED display panel, where the method includes:
the total current can be measured according to the electric signal converted by the photoelectric conversion device receiving the optical signal emitted by the light-emitting layer under the condition that the electric control shading layer is transparent
；
Driving the electric control shading layer to be converted into a light-tight state, and obtaining a thermal current according to the current detected by the photoelectric conversion device
；
Photocurrent generated by the light emitting layer
Comprises the following steps:
。
optionally, the method further includes: testing the shielding rate Z of the electric control light shielding layer;
according to the shading rate Z of the electric control shading layer, the light-emitting layer generatesActual photocurrent
Comprises the following steps:
。
optionally, the testing the shielding rate Z of the electrically controlled light shielding layer includes:
providing a transparent substrate, manufacturing an electric control shading layer on the transparent substrate according to a preset thickness, testing a first transmittance X in a transparent state of the transparent substrate and testing a second transmittance Y in an opaque state of the transparent substrate, wherein the shading rate Z = X-Y of the electric control shading layer.
On the other hand, an embodiment of the present invention further provides a display device, including: the OLED display panel is provided.
According to the OLED display panel, the light attenuation detection method and the display device, the photoelectric conversion device is arranged to convert the optical signals emitted by the light emitting layer so as to monitor the aging condition of the light emitting layer in real time and perform brightness compensation on the light emitting layer, the electric control light shielding layer is arranged to be converted between the transparent state and the light-tight state, the temperature interference generated by the light emitting layer can be eliminated in the detection of the light emitting layer, the size of the detection device cannot be increased, and the purpose of accurately detecting the actual light emitting condition of the light emitting layer of the pixel unit is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an OLED display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a photoelectric conversion device of an OLED display panel according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a light attenuation detection method for an OLED display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of testing a shading rate in a light attenuation detection method of an OLED display panel according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the OLED display panel, the light attenuation detecting method thereof, and the display device according to the present invention with reference to the accompanying drawings and the preferred embodiments will be made below.
Example one
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides an OLED display panel, which includes a plurality of pixel units arranged in an array on a display substrate 1, and further includes:
a light-emitting layer 2, wherein the light-emitting layer 2 includes a pixel region 210 corresponding to a pixel unit and a detection region 220 outside the pixel region 210; a photoelectric conversion device 3, the photoelectric conversion device 3 being disposed in the detection region 220, and being configured to receive an optical signal emitted from the light-emitting layer 2 and convert the received optical signal into an electrical signal; the light incident side of the photoelectric conversion device 3 is provided with an electrically controlled shading layer 4 for switching between a transparent state and a non-transparent state.
The display substrate 1 is provided with a plurality of pixel units, each pixel unit comprises a cathode, an anode and a light-emitting layer 2, the light-emitting layer 2 comprises a pixel area 210 corresponding to the pixel unit, and the detection area 220 extends to the outside of the pixel area 210 and is used for detecting the actual display brightness of the light-emitting layer 2 of the pixel unit, so that the brightness compensation is performed according to the real-time change of the display brightness of the light-emitting layer 2 of the pixel unit, the uniformity of light emission of the light-emitting layer 2 of each pixel unit of the display panel is ensured, the condition that the display brightness of each pixel unit is uneven due to aging of the light-emitting layer 2 is avoided, and the display effect of the display panel is improved. The photoelectric conversion device 3 is correspondingly disposed in the detection area of the light emitting layer 2, and can receive the optical signal emitted by the light emitting layer 2, convert the optical signal into an electrical signal, and detect the value of the electrical signal through an external detection module, for example: the detection module may be an ammeter, a voltmeter, or other detection devices, and may compensate the brightness of the pixel unit according to the detection result by controlling the voltage value between the anode and the cathode of the pixel unit to control the light emitting state of the light emitting layer 2 of the pixel unit.
Specifically, after the light emitting layer 2 of the pixel unit emits a light signal, the photoelectric conversion device 3 converts the light signal into an electrical signal, and the electrical signal is output to detect a corresponding current value, where the current value includes a photocurrent emitted by the light emitting layer 2 of the pixel unit and a thermal current generated during the operation of the light emitting layer 2, so that the current value measured in this state is a sum of the photocurrent of the light emitting layer 2 and the thermal current, and the detection method cannot obtain a value of the photocurrent actually emitted by the light emitting layer 2. Here, adopt automatically controlled light shield layer 4, automatically controlled light shield layer 4 can change between transparent state and light-tight state, can realize the conversion of two kinds of states of automatically controlled light shield layer 4 through automatically controlled mode, and set up automatically controlled light shield layer 4 in photoelectric conversion device 3's income light side, be promptly when automatically controlled light shield layer 4 is transparent state, the light signal that luminescent layer 2 sent can transmit automatically controlled light shield layer 4 to photoelectric conversion device 3, and when automatically controlled light shield layer 4 is light-tight state, automatically controlled light shield layer 4 plays the effect of sheltering from between photoelectric conversion device 3 and luminescent layer 2, the light that luminescent layer 2 sent can't transmit to photoelectric conversion device 3. Specifically, when the light emitting layer 2 of the pixel unit is detected to emit light, the electrically controlled light shielding layer 4 is first made to be transparent, that is, the light emitted by the light emitting layer 2 can be transmitted to the photoelectric conversion device 3 through the electrically controlled light shielding layer 4, the photoelectric conversion device 3 receives a light signal and converts the light signal into an electrical signal, and the total current value of the photocurrent and the thermoelectric current generated by the light emitting layer 2 can be obtained after the output; in order to accurately obtain the light current value emitted by the light emitting layer 2, so as to monitor the aging condition of the light emitting layer 2 and perform brightness compensation on the light emitting layer 2, after the obtained total current value is stable, the electrically controlled light shielding layer 4 can be converted into an opaque state, the photoelectric conversion device 3 cannot receive the light signal emitted by the light emitting layer 2, and the temperature reduction of the light emitting layer 2 is a relatively slow process, at this time, a cliff type drop occurs in the current value detected in the photoelectric conversion device 3, the current value after the drop is the thermal current generated by the light emitting layer 2, and the current value of the drop part is the photocurrent of the light emitting layer 2, namely the photocurrent of the light emitting layer 2 is the difference value between the measured total current and the thermal current, so that the influence of the temperature on the detection result of the photoelectric conversion device 3 can be eliminated, and the purpose of accurately detecting the photocurrent value emitted by the light emitting layer 2 can be achieved.
The embodiment of the invention provides an OLED display panel, which can convert an optical signal emitted by a light emitting layer by arranging a photoelectric conversion device so as to monitor the aging condition of the light emitting layer in real time and perform brightness compensation on the aging condition, and can convert between a transparent state and a non-transparent state by arranging an electric control light shielding layer, so that the interference of temperature generated by the light emitting layer in the detection of the light emitting layer can be eliminated, the volume of a detection device cannot be increased, and the aim of accurately detecting the actual light emitting condition of the light emitting layer of a pixel unit is fulfilled.
As shown in fig. 1 and fig. 2, specifically, the photoelectric conversion device 3 may have a plurality of specific configurations, for example: the photoelectric conversion device 3 may include a first electrode 310, a second electrode 320, and a photodiode 330 disposed between the first electrode 310 and the second electrode 320; wherein, the first electrode 310 may be disposed as a conductive metal, and the first electrode 310 is stacked on the display substrate 1; the second electrode 320 is a transparent electrode for transmitting an optical signal of the light emitting layer; the photodiode 330 is used to receive the optical signal and convert it into an electrical signal.
As shown in fig. 2, the photodiode 330 may be a PIN photodiode, and the PIN photodiode is formed by adding a low-doped Intrinsic (Intrinsic) layer semiconductor 303 between a P-type semiconductor material 301 and an N-type semiconductor material 302, and has higher sensitivity and shorter required time compared with a general photodiode. Of course, the photodiode 330 may also be a PN-type photodiode or the like, and is intended to realize reliable conversion of optical signals and electrical signals, and is not particularly limited herein.
The photoelectric conversion device 3 is used for converting an optical signal emitted by the light emitting layer 2 corresponding to the pixel unit into an electrical signal so as to achieve the purpose of detecting the condition of the light emitting brightness of the pixel unit and facilitate the compensation of the brightness of the aged light emitting layer 2, and specifically, the photoelectric conversion device 3 can be arranged corresponding to the light emitting layer 2 of each pixel unit, that is, each photoelectric conversion device only performs signal conversion on the light emitting layer 2 of one pixel unit; or, each photoelectric conversion device may also be disposed corresponding to the light emitting layers 2 of a plurality of pixel units, that is, each photoelectric conversion device 3 may perform signal conversion on the light emitting layers 2 of a plurality of pixel units, which may reduce the number of detection devices disposed on the display panel and simplify the complexity of the display panel.
As shown in fig. 1, the OLED display panel proposed in this embodiment further includes: and a source of the first thin film transistor 5 is connected to the first electrode 310, and is used for driving the photodiode 330 to operate. The first thin film transistor 5 may be used as a switch for driving the photoelectric conversion device 3, specifically, the source of the first thin film transistor 3 is connected to the first electrode 310.
Specifically, the electrically controlled shading layer 4 can be made of electrochromic material; the electrically controlled light shielding layer 4 is in a transparent state when no electrical signal is applied, and the electrically controlled light shielding layer 4 is in a non-transparent state when an electrical signal is applied. The electrochromic material is a phenomenon that the optical properties of the material generate stable and reversible color changes under the action of an applied electric field, and the material shows reversible changes of color and transparency in appearance, and is divided into an inorganic electrochromic material and an organic electrochromic material. The performance of the electrochromic material is utilized to realize that the influence of temperature on the detection result is eliminated when the brightness condition of the luminescent layer 2 is detected, namely, no electric signal is applied to the electric control shading layer 4 at first, the electrochromic material is in a transparent state when no electric field is applied, and the total current containing photocurrent and thermoelectric current can be detected; and then, by applying an electric signal to the electric control shading layer 4, the electrochromic material is in a light-tight state when an electric field is applied, and can detect the thermal current, so that the value of the photocurrent can be obtained.
As shown in fig. 1, the OLED display panel proposed in this embodiment further includes: and a second thin film transistor 6, wherein a source of the second thin film transistor 6 is connected with the electrically controlled shading layer 4, and is used for driving the state transition of the electrically controlled shading layer 4. The second thin film transistor 6 may be used as a switch for driving the state transition of the electrically controlled light shielding layer 4, the electrically controlled light shielding layer 4 is in a light-transmitting state when no electrical signal is applied to the electrically controlled light shielding layer 4, and the electrically controlled light shielding layer 4 is in a light-non-transmitting state when an electrical signal is applied to the electrically controlled light shielding layer 4 through the second thin film transistor 6.
Example two
As shown in fig. 3, a second embodiment of the present invention provides a method for detecting light attenuation of an OLED display panel, including:
s1: the total current can be measured according to the electric signal converted by the photoelectric conversion device 3 receiving the optical signal emitted by the light-emitting layer 2 under the condition that the electric control shading layer 4 is transparent
；
S2: the electrically controlled light shielding layer 4 is driven to be converted into a non-light-tight state, and a thermal current can be obtained according to the current detected by the photoelectric conversion device 3
；
S3: photocurrent generated from the light emitting layer 2
Comprises the following steps:
。
wherein, after OLED lights, the pixel unit lasts luminous, and luminescent layer 2 can produce certain heat when luminous, does not exert the signal of telecommunication at first to automatically controlled light shield layer 4, makes automatically controlled light shield layer 4 keep the transparent state, treats OLED job stabilization back, and the luminescent layer 2 temperature of pixel unit tends to stably, and the light signal conversion who sends luminescent layer 2 through photoelectric converter 3 this moment is the signal of telecommunication, can carry out the detection of signal of telecommunication value through the detection module of peripheral hardware, for example: the detection module may be an ammeter, and the converted current value may be obtained, and the current value includes two parts, one part is a photocurrent generated by the light emitting layer 2, and the other part is a thermal current converted from heat generated by the light emitting layer 2 during operation, where the current value is a total current
(ii) a At the total current
After the stabilization, applying an electrical signal to the electrically controlled light shielding layer 4 to convert the electrically controlled light shielding layer 4 into a black and opaque state, wherein the light of the photoelectric conversion device 3 is isolated, the received photocurrent of the light emitting layer 2 is suddenly reduced to zero, but the OLED is still operating, the temperature of the light emitting layer 2 of the pixel unit remains stable, and the current value obtained by conversion of the photoelectric conversion device 3 is the thermal current
(ii) a Through the total current
And a thermal current
The difference value of (a) can obtain the photocurrent generated by the light emitting layer 2, i.e. the photocurrent generated by the light emitting layer 2
Is composed of
。
The second embodiment of the invention provides a light attenuation detection method for an OLED display panel, which is characterized in that a photoelectric conversion device is used for converting optical signals emitted by a light emitting layer of a pixel unit into electric signals, so that the aging condition of the light emitting layer can be monitored in real time to carry out brightness compensation on the light emitting layer.
As shown in fig. 3, a second embodiment of the present invention provides a method for detecting light attenuation of an OLED display panel, further including: s4: testing the shading rate Z of the electrically controlled shading layer 4; according to the shading rate Z of the electric control shading layer 4, the luminous layer 2 is generatedActual photocurrent of
Comprises the following steps:
. Photocurrent generated by the light emitting layer obtained in the step S3
The light blocking rate of the electrically controlled light blocking layer 4 may not reach 100% due to other influence factors such as the property of the material itself. In order to obtain a more accurate photocurrent value, the shielding rate Z of the electrically controlled light shielding layer 4 can be tested to obtain a numerical value of the shielding rate Z, and based on the above, the part of the photocurrent shielded by the electrically controlled light shielding layer 4 is set as the accurate photocurrent corresponding to the light emitting layer 2,
then, then
。
As shown in fig. 4, specifically, the step of testing the shading rate Z of the electrically controlled shading layer 4 includes: providing a transparent substrate 7, manufacturing an electric control shading layer 4 on the transparent substrate 7 according to a preset thickness, testing a first transmittance X in a transparent state and testing a second transmittance Y in a non-transparent state, wherein the shading rate Z = X-Y of the electric control shading layer 4. The method for testing the shielding rate Z of the electrically controlled light shielding layer 4 comprises the following steps: providing a transparent substrate 7, for example, the transparent substrate 7 may be a glass plate, etc., fabricating the electrically controlled light shielding layer 4 on the transparent substrate 7 with a predetermined thickness, where the predetermined thickness is equal to the thickness of the electrically controlled light shielding layer 4 disposed on the light incident side of the photoelectric conversion device 3, testing the transmittance X in its initial, transparent state, testing the first transmittance X again after applying an electrical signal thereto for a predetermined period of time to convert it into a black, opaque state, where the predetermined period of time may be equal to the charging period of the OLED to obtain a second transmittance Y, and obtaining the shielding rate Z of the electrically controlled light shielding layer after obtaining the first transmittance X and the second transmittance Y, i.e., Z = X-Y.
EXAMPLE III
An embodiment of the present invention provides a display device, including: the OLED display panel is provided.
Specifically, the display device may be an electronic device with a display function, such as a television, a mobile phone, and a tablet computer.
The third embodiment of the invention provides a display device, which can convert an optical signal emitted by a light emitting layer by arranging a photoelectric conversion device so as to monitor the aging condition of the light emitting layer in real time and perform brightness compensation on the aging condition, and can convert the electric control light shielding layer between a transparent state and a non-transparent state by arranging the electric control light shielding layer, so that the interference of temperature generated by the light emitting layer in the detection of the light emitting layer can be eliminated, the volume of a detection device cannot be increased, the purpose of accurately detecting the actual light emitting condition of the light emitting layer of a pixel unit is achieved, the uniformity of the display brightness of the display device can be ensured, and the display effect of the display device can be improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. An OLED display panel, including a plurality of pixel units arranged in an array on a display substrate, comprising:
a light emitting layer including a pixel region corresponding to the pixel unit and a detection region outside the pixel region;
a photoelectric conversion device disposed in the detection region, for receiving an optical signal emitted from the light emitting layer and converting the received optical signal into an electrical signal, the photoelectric conversion device being disposed corresponding to the light emitting layer of each of the pixel units, or the photoelectric conversion device being disposed corresponding to the light emitting layers of a plurality of the pixel units;
the photoelectric conversion device comprises a photoelectric conversion device, a light source and a light shielding layer, wherein the light incident side of the photoelectric conversion device is provided with an electric control light shielding layer for converting a transparent state and a non-transparent state;
the photoelectric conversion device can be used for receiving an electric signal converted from an optical signal emitted by the light-emitting layer and measuring the total current when the electric control shading layer is in a transparent state;
and under the condition that the electric control shading layer is in a light-tight state, the photoelectric conversion device can be used for obtaining a thermoelectric current according to the current detected by the photoelectric conversion device, and the photocurrent generated by the luminous layer is the difference value between the total current and the thermoelectric current.
2. The OLED display panel of claim 1,
the photoelectric conversion device comprises a first electrode, a second electrode and a photodiode arranged between the first electrode and the second electrode;
the first electrode is arranged as a conductive metal and is arranged on the display substrate in a stacking manner;
the second electrode is arranged as a transparent electrode and is used for transmitting an optical signal of the light-emitting layer;
the photodiode is used for receiving an optical signal and converting the optical signal into an electric signal.
3. The OLED display panel of claim 2, further comprising:
and the source electrode of the first thin film transistor is connected with the first electrode and is used for driving the photodiode.
4. The OLED display panel of claim 1,
the electric control shading layer is made of electrochromic materials;
the electric control shading layer is in a transparent state when no electric signal is applied, and the electric control shading layer is in a non-transparent state when the electric signal is applied.
5. The OLED display panel of claim 4, further comprising:
and the source electrode of the second thin film transistor is connected with the electric control shading layer and is used for driving the electric control shading layer.
6. A method for detecting light attenuation of an OLED display panel, applied to the OLED display panel according to any one of claims 1 to 5, comprising:
when the electric control shading layer is in a transparent state, the total current can be measured according to the electric signal converted by the photoelectric conversion device receiving the optical signal emitted by the light-emitting layer
；
Driving the electric control shading layer to be converted into a light-tight state, and obtaining a thermal current according to the current detected by the photoelectric conversion device
；
Photocurrent generated by the light emitting layer
Comprises the following steps:
。
7. the method for detecting light attenuation of an OLED display panel according to claim 6, further comprising:
testing the shielding rate Z of the electric control light shielding layer;
according to the shielding rate Z of the electric control light shielding layer, the actual photocurrent generated by the light emitting layer
Comprises the following steps:
。
8. the method for detecting the light attenuation of the OLED display panel according to claim 7, wherein the step of testing the shading rate Z of the electrically controlled shading layer comprises:
providing a transparent substrate, manufacturing an electric control shading layer on the transparent substrate according to a preset thickness, testing a first transmittance X in a transparent state of the transparent substrate and testing a second transmittance Y in an opaque state of the transparent substrate, wherein the shading rate Z = X-Y of the electric control shading layer.
9. A display device comprising the OLED display panel according to any one of claims 1 to 5.
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