A common gate controlled multi-layer structure color light emitting device

Abstract

This invention discloses a multilayer color light-emitting device with a shared gate control, comprising: light-emitting pixels, each including a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit; each of the red, green, and blue light-emitting units includes a first electrode, a light-emitting functional layer, and a second electrode; a red gate insulating layer is disposed above the red light-emitting unit, and a red gate control electrode is disposed above the red gate insulating layer; the green and blue light-emitting units are similarly disposed; a first high-resistivity lead is connected between the red and green gate control electrodes within the same light-emitting pixel, and a second high-resistivity lead is connected between the green and blue gate control electrodes within the same light-emitting pixel; each blue gate control electrode is uniformly connected to a first point, and each red control electrode is uniformly connected to a second point. This invention effectively simplifies the integrated structure of the gate control circuit.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic displays, and in particular to a multilayer color light-emitting device with a shared gate control. Background Technology

[0002] Light-emitting devices (LEDs) are a crucial component of optoelectronic displays, emitting light to display images or information. Many LEDs operate on the principle that, when an electric current is applied, electrons and holes recombine in the light-emitting layer to form excitons. These excitons recombine, releasing energy and emitting light, as seen in QLEDs (quantum dot light-emitting diodes) and OLEDs (organic light-emitting diodes). These LEDs offer advantages such as rich color reproduction, high contrast, fast response times, wide viewing angles, and energy efficiency. However, their luminous efficiency and brightness are significantly affected by carrier recombination. Optimal device efficiency is typically achieved by combining different functional layers and quantum dots, a process that requires substantial time, material, and human resources. Therefore, gate modulation has emerged. By controlling the gate, a built-in electric field can be created within these LEDs, allowing for the regulation of carrier mobility and thus controlling luminous efficiency, ultimately improving overall luminous efficiency.

[0003] Existing integrated light-emitting devices typically employ one-to-one gate control, meaning a single control voltage regulates only one LED. If these devices require a large number of LEDs, the gate control circuitry becomes complex, leading to a bulky device size. Summary of the Invention

[0004] In view of the aforementioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a multilayer color light-emitting device with a shared gate control, which aims to simplify the integrated structure of the gate control circuit.

[0005] To achieve the above objectives, this invention discloses a stacked structure color light-emitting device with shared gate control. The stacked structure color light-emitting device includes: a plurality of light-emitting pixels arranged in rows and columns, each light-emitting pixel including a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit. Each red, green, and blue light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode. A red gate insulating layer is disposed above the red light-emitting unit, and a red gate control electrode is disposed above the red gate insulating layer. A green gate insulating layer is disposed above the green light-emitting unit, and a green gate control electrode is disposed above the green gate insulating layer. A color gate control electrode is provided, with a blue gate insulating layer disposed above the blue light-emitting unit, and a blue gate control electrode disposed above the blue gate insulating layer; a first high-resistivity lead is connected between the red gate control electrode and the green gate control electrode within the same light-emitting pixel, and a second high-resistivity lead is connected between the green gate control electrode and the blue gate control electrode within the same light-emitting pixel; each blue gate control electrode is uniformly connected to a first point, and each red control electrode is uniformly connected to a second point; wherein, the luminous efficiency of the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit decreases sequentially;

[0006] When the stacked structure color light-emitting device is gate-controlled, a first high potential is applied at the first point and a second low potential is applied at the second point. The potential difference between the first high potential and the second low potential generates a voltage drop through the first high-resistance lead and the second high-resistance lead, forming a first control gate voltage, a second control gate voltage, and a third control gate voltage from high to low on the blue gate control electrode, the green gate control electrode, and the red gate control electrode, respectively. The first control gate voltage is used to construct a first electric field to control the mobility of charge carriers in the blue light-emitting unit and adjust the luminous efficiency of the blue light-emitting unit. The second control gate voltage is used to construct a second electric field to control the mobility of charge carriers in the green light-emitting unit and adjust the luminous efficiency of the green light-emitting unit. The third control gate voltage is used to construct a third electric field to control the mobility of charge carriers in the red light-emitting unit and adjust the luminous efficiency of the red light-emitting unit.

[0007] Optionally, the red control electrode is connected to a third high-resistivity lead, and each of the red control electrodes is connected to the second point through the corresponding third high-resistivity lead. The second point is grounded, so that the second low potential is zero potential. The third high-resistivity lead is used to cooperate with the first high-resistivity lead and the second high-resistivity lead to form the first control gate voltage, the second control gate voltage, and the third control gate voltage, respectively satisfying the luminous efficiency requirements of the blue light-emitting unit, the green light-emitting unit, and the red light-emitting unit.

[0008] Optionally, each of the red control electrodes is directly connected to the second point; the first high potential is the first control gate voltage that satisfies the luminous efficiency of the blue light-emitting unit, and the second low potential is the third control gate voltage that satisfies the luminous efficiency of the red light-emitting unit.

[0009] Optionally, each color of the light-emitting unit is provided with an independent gate control electrode, and each of the blue gate control electrodes is uniformly connected to the first point, and each of the red control electrodes is uniformly connected to the second point.

[0010] Optionally, the same group of red gate control electrodes, green gate control electrodes, blue gate control electrodes, the first high-resistivity lead, and the second high-resistivity lead covers the same column of light-emitting pixels, so that light-emitting units of different colors in the same column of light-emitting pixels share the corresponding color gate control electrode.

[0011] Optionally, the resistance of the first high-resistance lead is greater than the resistance of the second high-resistance lead.

[0012] Optionally, the luminous efficiency of the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit increases sequentially.

[0013] The beneficial effects of this invention are as follows: 1. A red gate insulating layer is disposed above the red light-emitting unit, and a red gate control electrode is disposed above the red gate insulating layer; a green gate insulating layer is disposed above the green light-emitting unit, and a green gate control electrode is disposed above the green gate insulating layer; a blue gate insulating layer is disposed above the blue light-emitting unit, and a blue gate control electrode is disposed above the blue gate insulating layer; a first high-resistivity lead is connected between the red gate control electrode and the green gate control electrode within the same light-emitting pixel, and a second high-resistivity lead is connected between the green gate control electrode and the blue gate control electrode within the same light-emitting pixel; each blue gate control electrode is uniformly connected to a first point, and each red control electrode is uniformly connected to a second point. With this structure, during gate control, a first high potential is applied to the first point and a second low potential is applied to the second point. The potential difference between the first high potential and the second low potential generates a voltage drop through the first and second high-resistivity leads, forming a first control gate voltage, a second control gate voltage, and a third control gate voltage from high to low on the blue gate control electrode, the green gate control electrode, and the red gate control electrode, respectively. This invention, through the aforementioned structure, allows multiple light-emitting units of different colors to share gate control, effectively simplifying the integrated structure of the gate control circuit. Simultaneously, this invention enables each light-emitting unit sharing gate control to obtain a gate voltage that meets its required luminous efficiency, achieving an ideal control effect. 2. The red control electrode of this invention is connected to a third high-resistance lead, and each red control electrode is connected to a second point via a corresponding third high-resistance lead, with the second point grounded. This structure reduces the number of driving voltages, further simplifying the structure. 3. All red control electrodes of this invention are uniformly and directly connected to the second point; the first high potential is the first control gate voltage that meets the luminous efficiency requirements of the blue light-emitting unit, and the second low potential is the third control gate voltage that meets the luminous efficiency requirements of the red light-emitting unit. This connection method reduces the voltage difference between the first and second points, thereby reducing current and achieving energy saving. 4. In this invention, the same group of red, green, and blue gate control electrodes, the first high-resistance lead, and the second high-resistance lead cover the same column of light-emitting pixels, allowing light-emitting units of different colors in the same column to share the corresponding color gate control electrode. This invention further simplifies the integrated structure of the gate control circuit through such a structure, while also facilitating manufacturing.

[0014] In summary, this invention effectively simplifies the integrated structure of the gate control circuit while ensuring that the gate control meets the required luminous efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a stacked color light-emitting device with a shared gate control provided in a specific embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of a light-emitting unit provided in a specific embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of a stacked color light-emitting device with a shared gate control provided in the second specific embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of a multilayer color light-emitting device with a shared gate control provided in the third specific embodiment of the present invention. Detailed Implementation

[0019] This invention discloses a driving method for a multilayer color light-emitting device with a shared gate control. Those skilled in the art can refer to the content of this document and appropriately modify the technical details to implement it. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to implement and apply the technology of this invention.

[0020] According to the applicant's research, existing integrated light-emitting device (LED) devices generally use one-to-one gate control, meaning one control voltage regulates only one LED. If these devices require a large number of LEDs, the gate control circuitry becomes complex, leading to a bulky device size. However, using the same control voltage for driving LEDs results in different color LEDs having different luminous efficiencies and requiring different control voltages, thus failing to achieve optimal gate control.

[0021] Therefore, embodiments of the present invention provide a multilayer color light-emitting device with a shared gate controlled structure, such as... Figure 1As shown, the stacked structure color light-emitting device includes: multiple light-emitting pixels 101 arranged in rows and columns. Each light-emitting pixel 101 includes a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit. Each red, green, and blue light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode. A red gate insulating layer is disposed above the red light-emitting unit, and a red gate control electrode 102 is disposed above the red gate insulating layer. A green gate insulating layer is disposed above the green light-emitting unit, and a green gate control electrode 103 is disposed above the green gate insulating layer. A blue gate insulating layer is disposed above the blue light-emitting unit, and a blue gate control electrode 104 is disposed above the blue gate insulating layer. A first high-resistivity lead 105 connects the red gate control electrode 102 and the green gate control electrode 103 within the same light-emitting pixel 101, and a second high-resistivity lead 106 connects the green gate control electrode 103 and the blue gate control electrode 104 within the same light-emitting pixel 101. Each blue gate control electrode 104 is uniformly connected to a first point 107, and each red control electrode is uniformly connected to a second point 108.

[0022] The luminous efficiency of the red, green, and blue light-emitting units decreases sequentially. Figure 1 middle,

[0023] like Figure 2 As shown, the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit all include a first electrode, a light-emitting functional layer, and a second electrode, and each light-emitting unit is provided with a gate insulating layer and a gate control electrode above it.

[0024] It should be noted that in typical QLED or OLED displays, red light-emitting units usually have the highest photoelectric conversion efficiency (luminous efficiency), reaching 90-100%. Green light-emitting units have the next highest efficiency, generally in the range of 20-30%, significantly lower than red. Blue light-emitting units have the lowest efficiency among the three, approximately 10-20%, far lower than red and slightly lower than green. Therefore, when controlling luminous efficiency using gate voltage in the light-emitting pixel 101, the blue light-emitting unit requires the largest increase in efficiency, followed by the green, and then the red. That is, the gate voltage required for red, green, and blue light-emitting units gradually increases. Therefore, the light-emitting pixels 101 are arranged in red-green-blue or blue-green-red patterns to facilitate voltage reduction after high-resistivity lead installation.

[0025] When the multilayer structure color light-emitting device is gate-controlled, a first high potential is applied at the first point 107 and a second low potential is applied at the second point 108. The potential difference between the first high potential and the second low potential generates a voltage drop through the first high-resistance lead 105 and the second high-resistance lead 106, forming a first control gate voltage, a second control gate voltage, and a third control gate voltage from high to low on the blue gate control electrode 104, the green gate control electrode 103, and the red gate control electrode 102, respectively. The first control gate voltage is used to construct a first electric field to control the mobility of charge carriers in the blue light-emitting unit and adjust the luminous efficiency of the blue light-emitting unit. The second control gate voltage is used to construct a second electric field to control the mobility of charge carriers in the green light-emitting unit and adjust the luminous efficiency of the green light-emitting unit. The third control gate voltage is used to construct a third electric field to control the mobility of charge carriers in the red light-emitting unit and adjust the luminous efficiency of the red light-emitting unit. The "high" and "low" in the first high potential and the second low potential are relative.

[0026] It should be noted that, in this embodiment of the invention, each blue gate control electrode 104 is uniformly connected to the first point 107, each red control electrode is uniformly connected to the second point 108, and a first high-resistivity lead 105 is connected between the red gate control electrode 102 and the green gate control electrode 103 within the same light-emitting pixel 101, and a second high-resistivity lead 106 is connected between the green gate control electrode 103 and the blue gate control electrode 104 within the same light-emitting pixel 101. Thus, when a first high potential is applied to the first point 107 and a second low potential is applied to the second point 108, a first control gate voltage, a second control gate voltage, and a third control gate voltage, respectively, are formed on the blue gate control electrode 104, the green gate control electrode 103, and the red gate control electrode 102, respectively. This allows multiple light-emitting units of different colors to share gate control, effectively simplifying the integrated structure of the gate control circuit and ensuring that the gate voltage obtained by the light-emitting units of different colors meets their luminous efficiency requirements.

[0027] In another specific embodiment, if the luminous efficiency of the red, green and blue light-emitting units is different, the light-emitting units are arranged in order of luminous efficiency so that the gate voltage formed by the voltage drop meets the luminous efficiency requirements of each light-emitting unit.

[0028] In the first specific embodiment, such as Figure 3As shown, the red control electrode is connected to the third high-resistivity lead 109, and each red control electrode is connected to the second point 108 through the corresponding third high-resistivity lead 109. The second point 108 is grounded, so that the second low potential is zero potential. The third high-resistivity lead 109 is used to cooperate with the first high-resistivity lead 105 and the second high-resistivity lead 106 to form the first control gate voltage, the second control gate voltage and the third control gate voltage respectively satisfying the luminous efficiency requirements of the blue light-emitting unit, the green light-emitting unit and the red light-emitting unit.

[0029] It should be noted that this structure allows the second low potential to be driven without applying a drive, thereby reducing the number of drives and simplifying the structure.

[0030] In the second specific embodiment, such as Figure 1 As shown, each red control electrode is directly connected to the second point 108; the first high potential is the first control gate voltage that satisfies the luminous efficiency of the blue light-emitting unit, and the second low potential is the third control gate voltage that satisfies the luminous efficiency of the red light-emitting unit.

[0031] It should be noted that although this structure requires two different driving voltages to form a voltage drop, since these two driving voltages do not start from zero and are in the same direction, the potential difference between the two voltages is small, and the resulting current is also small, which can effectively save energy.

[0032] In the third specific embodiment, such as Figure 1 As shown, each color light-emitting unit is provided with an independent gate control electrode. All blue gate control electrodes 104 are uniformly connected to the first point 107, and all red control electrodes are uniformly connected to the second point 108.

[0033] In the fourth specific embodiment, such as Figure 4 As shown, the same group of red gate control electrode 102, green gate control electrode 103, blue gate control electrode 104, first high-resistivity lead 105 and second high-resistivity lead 106 cover the same column of light-emitting pixels 101, so that light-emitting units of different colors in the same column of light-emitting pixels 101 share the corresponding color gate control electrode. Figure 4 In the image, due to the overlay, a single luminous pixel 101 cannot be clearly shown; the area within the dashed box represents a single luminous pixel 101.

[0034] It should be noted that this structure is easier to integrate and easier to manufacture.

[0035] In this specific embodiment, the resistance of the first high-resistance lead 105 is greater than the resistance of the second high-resistance lead 106.

[0036] It should be noted that because the luminous efficiency of the red light-emitting unit is much greater than that of the green and blue units, the required gate control voltage is smaller, and thus the resistance of the first high-resistance lead 105 is greater than that of the second high-resistance lead 106.

[0037] In this specific embodiment, the luminous efficiency of the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit increases sequentially.

[0038] It should be noted that the original luminous efficiency of the red, green, and blue light-emitting units decreases in that order, so the required improvement in luminous efficiency increases in that order.

[0039] In this embodiment of the invention, a red gate insulating layer is disposed above the red light-emitting unit, and a red gate control electrode 102 is disposed above the red gate insulating layer; a green gate insulating layer is disposed above the green light-emitting unit, and a green gate control electrode 103 is disposed above the green gate insulating layer; a blue gate insulating layer is disposed above the blue light-emitting unit, and a blue gate control electrode 104 is disposed above the blue gate insulating layer; a first high-resistivity lead 105 is connected between the red gate control electrode 102 and the green gate control electrode 103 within the same light-emitting pixel 101, and a second high-resistivity lead 106 is connected between the green gate control electrode 103 and the blue gate control electrode 104 within the same light-emitting pixel 101; each blue gate control electrode 104 is uniformly connected to a first point 107, and each red control electrode is uniformly connected to a second point 108. This invention, through its structure, allows for the application of a first high potential at the first point 107 and a second low potential at the second point 108 during gate control. The potential difference between the first high potential and the second low potential generates a voltage drop through the first high-resistance lead 105 and the second high-resistance lead 106, forming a first control gate voltage, a second control gate voltage, and a third control gate voltage, respectively, from high to low, on the blue gate control electrode 104, the green gate control electrode 103, and the red gate control electrode 102. This structure allows multiple light-emitting units of different colors to share gate control, effectively simplifying the integrated structure of the gate control circuit. Furthermore, this invention enables each light-emitting unit sharing the gate control to obtain a gate voltage that meets its required luminous efficiency, achieving an ideal control effect.

[0040] In this embodiment of the invention, the red control electrode is connected to the third high-resistance lead 109, and each red control electrode is connected to the second point 108 through the corresponding third high-resistance lead 109. The second point 108 is grounded. This structure reduces the number of driving voltages and further simplifies the structure.

[0041] In this embodiment of the invention, each red control electrode is directly connected to the second point 108; the first high potential is the first control gate voltage that satisfies the luminous efficiency of the blue light-emitting unit, and the second low potential is the third control gate voltage that satisfies the luminous efficiency of the red light-emitting unit. This connection method can reduce the voltage difference between the first point 107 and the second point 108, thereby reducing the current and achieving energy saving.

[0042] In this embodiment of the invention, the same set of red gate control electrodes 102, green gate control electrodes 103, blue gate control electrodes 104, first high-resistivity leads 105, and second high-resistivity leads 106 cover the same column of light-emitting pixels 101. This allows light-emitting units of different colors in the same column of light-emitting pixels 101 to share the corresponding color gate control electrodes. This structure further simplifies the integration structure of the gate control circuit and facilitates manufacturing.

[0043] In summary, the embodiments of the present invention effectively simplify the integrated structure of the gate control circuit while ensuring that the gate control meets the required luminous efficiency.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0045] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A multilayer color light-emitting device with a shared gate control, characterized in that, The stacked structure color light-emitting device includes: a plurality of light-emitting pixels arranged in rows and columns, each light-emitting pixel including a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit. Each red, green, and blue light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode. A red gate insulating layer is disposed above the red light-emitting unit, and a red gate control electrode is disposed above the red gate insulating layer. A green gate insulating layer is disposed above the green light-emitting unit, and a green gate control electrode is disposed above the green gate insulating layer. A blue gate insulating layer is disposed above the blue light-emitting unit, and a blue gate control electrode is disposed above the blue gate insulating layer. A first high-resistivity lead is connected between the red and green gate control electrodes within the same light-emitting pixel, and a second high-resistivity lead is connected between the green and blue gate control electrodes within the same light-emitting pixel. Each blue gate control electrode is uniformly connected to a first point, and each red control electrode is uniformly connected to a second point. The luminous efficiency of the red, green, and blue light-emitting units decreases sequentially. When the stacked structure color light-emitting device is gate-controlled, a first high potential is applied at the first point and a second low potential is applied at the second point. The potential difference between the first high potential and the second low potential generates a voltage drop through the first high-resistance lead and the second high-resistance lead, forming a first control gate voltage, a second control gate voltage, and a third control gate voltage from high to low on the blue gate control electrode, the green gate control electrode, and the red gate control electrode, respectively. The first control gate voltage is used to construct a first electric field to control the mobility of charge carriers in the blue light-emitting unit and adjust the luminous efficiency of the blue light-emitting unit. The second control gate voltage is used to construct a second electric field to control the mobility of charge carriers in the green light-emitting unit and adjust the luminous efficiency of the green light-emitting unit. The third control gate voltage is used to construct a third electric field to control the mobility of charge carriers in the red light-emitting unit and adjust the luminous efficiency of the red light-emitting unit.

2. The multilayer color light-emitting device with shared gate modulation according to claim 1, characterized in that, The red control electrode is connected to the third high-resistivity lead, and each of the red control electrodes is connected to the second point through the corresponding third high-resistivity lead. The second point is grounded, so that the second low potential is zero potential. The third high-resistivity lead is used to cooperate with the first high-resistivity lead and the second high-resistivity lead to form the first control gate voltage, the second control gate voltage and the third control gate voltage, respectively satisfying the luminous efficiency requirements of the blue light-emitting unit, the green light-emitting unit and the red light-emitting unit.

3. The multilayer color light-emitting device with shared gate modulation according to claim 1, characterized in that, Each of the red control electrodes is directly connected to the second point; the first high potential is the first control gate voltage that satisfies the luminous efficiency of the blue light-emitting unit, and the second low potential is the third control gate voltage that satisfies the luminous efficiency of the red light-emitting unit.

4. The multilayer color light-emitting device with shared gate modulation according to claim 1, characterized in that, Each of the light-emitting units of each color is provided with an independent gate control electrode. All the blue gate control electrodes are uniformly connected to the first point, and all the red control electrodes are uniformly connected to the second point.

5. The multilayer color light-emitting device with shared gate modulation according to claim 1, characterized in that, The red gate control electrode, the green gate control electrode, the blue gate control electrode, the first high-resistivity lead, and the second high-resistivity lead in the same group cover the same column of light-emitting pixels, so that light-emitting units of different colors in the same column of light-emitting pixels share the gate control electrode of the corresponding color.

6. The multilayer color light-emitting device with shared gate modulation according to claim 1, characterized in that, The resistance of the first high-resistance lead is greater than the resistance of the second high-resistance lead.

7. The multilayer color light-emitting device with shared gate modulation according to claim 1, characterized in that, The luminous efficiency of the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit increases sequentially.

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