This application claims the benefit of Chinese Patent Application No. 201410051852.3 filed on Feb. 14, 2014 in the State Intellectual Property Office of China, the application of which is incorporated herein by reference in its entirety.
The present application relates in general to a dual-side display, a device for controlling the dual-side display and the method for manufacturing the same.
OLED display is a solid-state device formed by thin organic molecule layers which can emit light after voltage is applied. OLED displays usually have a sandwich structure, that is, an organic layer is sandwiched between two electrodes. Electron hole and electron are injected from anode and cathode, respectively, transmit in an organic layer, meet each other, form exciton and emit light. The anode is a transparent electrode made of ITO (Indium Tin Oxide), so that it can transmit light. The cathode is usually made of low work function metal such as Magnesium (Mg) or Lithium (Li). OLED display can provide electronic device a brighter and clearer image, and it has lower power consumption than the conventional LED display screen. As a result, the OLED display has advantages as below: compared with crystal layers of the conventional LED or LCD display, the organic molecule layer of OLED is thinner, lighter and more flexible; the OLED display screen is made of self-emissive material instead of using a back light plate, and it has wide visual angle, uniform image quality, fast response speed, high colorize capability. Besides, it can emit light employing simple driving circuit, has simple manufacturing process, can be made of flexible panel and meets the requirement of being slim, thin, short and small.
From the description above, as limited by the evaporation accuracy of OLED display device, the conventional OLED display device has small actual light emitting area and low aperture ratio, most pixel areas are not used. In the conventional OLED display device, the aperture ratio is less than 20%. As a result, the conventional OLED display device has low luminance, and it cannot satisfy the requirements of the user in some cases.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
In the application, to prevent the problems in the conventional technology, the application discloses a dual-side OLED display which not only uses the display area effectively but also achieves dual-side display effect. The application also discloses a controlling device for controlling the dual-side display and a method for manufacturing the dual-side display.
A technical solution of the application discloses a dual-side display, including an OLED substrate, a package substrate located at opposite side of the OLED substrate and frit seal sandwiched between the OLED substrate and the package substrate. In the dual-side display, the package substrate is an electrophoresis membrane, the light-emitting area of the OLED device achieves OLED display, and the area that the OLED does not emit light achieves electrophoresis membrane display. The OLED emits light from bottom, the electrophoresis membrane displays from the top, the OLED and the electrophoresis membrane can display at the same time or separately.
OLED light emitting devices and active matrix TFTs are disposed at the OLED substrate.
The OLED substrate is made of rigid or flexible material.
The electrophoresis membrane is capable of achieving flexible display.
The disclosure further discloses a controlling device for controlling the dual-side display, including a first switching TFT (T1), a driving TFT (T2), a drain of the first switching TFT (T1) being connected to a data line, a gate of the first switching TFT (T1) is connected to a first scan line, a source of the first switching TFT (T1) is connected to an end of a storage capacitor and a gate of the driving TFT (T2), wherein, the controlling device further comprises a second switching TFT (T3), a drain of the second switching TFT (T3) is connected to the data line, a gate of the second switching TFT (T3) is connected to a second scan line, the source of the second switching TFT (T3) is connected to an electrode of the electrophoresis membrane,
The gate (T2) of the driving TFT is connected to the source of the first switching TFT (T1), the drain of the driving TFT is connected to the power line, the source of the driving TFT is connected to an anode of the OLED substrate.
When the first switching TFT (T1) is turned on, the voltage is written to the storage capacitor via the first switching TFT (T1). When the driving TFT (T2) is turned on, the electric current input by the power line flows through the OLED substrate to make the OLED substrate display. Namely, when only OLED display is needed, T1 is turned on first, voltage is written to the storage capacitor via the first switching TFT (T1), and then TFT T1 is turned off, and then TFT T2 is turned on, the OLED begins to emit light.
The electric current flowing through the OLED substrate is controlled by the data voltage.
When the first switching TFT (T1) is turned off and the second switching TFT (T3) is turned on, only the electrophoresis membrane displays, when the first switching TFT (T1) and the second switching TFT (T3) are turned on at the same time, the OLED substrate and the electrophoresis membrane display at the same time.
The first switching TFT (T1) and the second switching TFT (T3) shares a data line.
The disclosure further discloses method for manufacturing the dual-side display, wherein the method comprises the steps of: depositing a semi-conductor layer at a transparent substrate and patterning the semi-conductor layer; depositing a first insulating layer and a first metal layer on the patterned semi-conductor layer and patterning the first metal layer; depositing a second insulating layer on the patterned metal layer, and patterning the second insulating layer; then depositing the second metal layer and patterning the second metal layer; forming a flat layer at the surface of the patterned second metal layer and patterning the flat layer; depositing a pixel electrode layer at the surface of the flat layer, a first part of the pixel electrode layer is connected to a source of a driving TFT, and used as the anode of the OLED substrate, the second part of the pixel electrode layer is connected to a pixel electrode of the electrophoresis membrane and controls the display of the electrophoresis membrane; evaporating the OLED light emitting material and cathode material in sequence above the OLED substrate to form the OLED device; and packaging the OLED device with the electrophoresis membrane.
The substrate is a transparent rigid substrate or a transparent flexible substrate.
The semi-conductor layer is a A-Si (Amorphous Silicon), LTPS (Low Temperature Poly Silicon) or oxide.
The flat layer is formed by spin coating.
The first part of the pixel electrode layer and the second part of the pixel electrode layer are independent.
The dual-side display according to the application can effectively increase the light emitting area of the OLED, as well as the aperture ration and the display luminance of the OLED display panel, and achieves dual-side display to satisfy different requirements. Besides, in the application, the OLED display can be complementary with the electrophoresis membrane, therefore, it can make full use of light-emitting pixel area and obtain better light emitting effect.
It should be understood that, the foregoing general description and the following detailed description are exemplary and explanatory, and are intended to provide further explanation of the claimed disclosure.
The foregoing and other features and advantages of the disclosure will be apparent to those skilled in the art in view of the following detailed description, taken in conjunction with the accompanying drawings, in which.
Exemplary embodiments of the application will now be described more fully with reference to the accompanying drawings.
The electrophoresis membrane 20 in the disclosure can not only be used as package material for packing the OLED substrate 10, but also achieves flexible display. The electrophoresis membrane 20 itself can display images, when voltage is applied across two ends of the electrophoresis membrane 20, positive charges and negative charges in the electrophoresis membrane capsule inside the electrophoresis membrane 20 move towards two directions, respectively, so as to achieve the function for displaying. The electrophoresis membrane 20 has bi-stable state which is an outstanding characteristic thereof. The electrophoresis membrane 20 may still display images even when the applied electric field is removed. In one case in practical application, when only displaying dynamic color image is needed, the OLED display is switched to, and when only displaying black-white image is needed, the electrophoresis membrane display is used only to save power. As a result, according to the application, the part of the electrophoresis membrane 20 that is located at the OLED display area is taken as packaging material, and the part of the electrophoresis membrane 20 that does not cover the OLED display area may be used as electrophoresis membrane display after voltage is applied across two ends thereof. As shown in the arrow in
First, depositing a semi-conductor layer 41 on a glass substrate 40 and patterning the semi-conductor layer 41. To make the OLED emit light from the bottom, the substrate 40 may also be made of other transparent materials. The semi-conductor layer 41 maybe Amorphous Silicon (A-Si), low temperature poly-silicon (LTPS), oxide and so on. Afterwards, depositing a first insulating layer 42 and a first metal layer 43 in sequence on the patterned semi-conductor layer 41, and patterning the first metal layer 43, the first part 43a of the patterned first metal layer corresponds to the gate of TFT T2 in
Afterwards, depositing a second insulating layer 44 at the patterned metal layer 43, and patterning the second insulating layer 44. The purpose of patterning the second insulating layer 44 is to form contact holes on the surface of the semi-conductor layer 41 and the surface of the first metal layer 43. The purpose of forming the contact hole is to achieve electric contact between the semi-conductor layer 41 and the second metal layer 45, and between the first metal layer 43 and the second metal layer 45. Afterwards, depositing the second metal layer 45 and patterning the second metal layer 45, the fourth part 45d of the patterned second metal layer corresponds to the data line Vdata in
TFT T1 and TFT T3 share a data line 45d. When the gate 43c of the TFT T3 is applied with voltage, TFT T3 is conducted, and electric current flows through the channel, data line voltage Vdata is written to the pixel electrode 47b to generate voltage difference between two sides of the electrophoresis membrane 50. Under the effect of the voltage difference, the positive particle capsule and negative particle capsule of the electrophoresis membrane 50 move towards opposite direction to achieve electrophoresis membrane display. The source 45c of TFT T1 is connected to the gate 43a of the TFT T2 (not shown), and when the TFT T1 is conducted, the voltage of the data line 45d is written to the gate of the TFT T2 and stored in the capacitor (not shown) between the gate 43a in
The operating process of the dual-side display in the embodiment shown in
According to the OLED display device in the disclosure, since the electrophoresis membrane is used as the package substrate, the OLED display device not only achieves dual display, but also adds a pixel layer due to the electrophoresis membrane, which increases the aperture area as well as the display luminance of the OLED.
Exemplary embodiments have been specifically shown and described as above. It will be appreciated by those skilled in the art that the application is not limited the disclosed embodiments; rather, all suitable modifications and equivalent which come within the spirit and scope of the appended claims are intended to fall within the scope of the application.
Number | Date | Country | Kind |
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201410051852.3 | Feb 2014 | CN | national |