PMOLED chip circuit integrating aging of screen body and module

Abstract

The utility model discloses an integrated screen body and module aging PMOLED chip circuit, and relates to the technical field of display. The PMOLED chip circuit integrating the screen body and the module aging comprises an organic light-emitting diode pixel circuit, an LED chip circuit and an LED chip circuit, the first multiplexing circuit is electrically connected with one end of the organic light emitting diode pixel circuit; the second multiplexing circuit is electrically connected with the other end of the organic light emitting diode pixel circuit; wherein the first multiplexing circuit and the second multiplexing circuit are opened or closed at the same time, so that screen body aging and module aging are integrated. According to the utility model, the problem that the cost and the reject ratio are increased due to the fact that the aging of the PMOLED screen body and the aging of the module need to be carried out respectively at present is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a PMOLED chip circuit integrating panel aging and module aging. Background Technique

[0002] PMOLED is a passive light-emitting OLED. Generally, an evaporation coating process is used for OLED devices, that is, PVD (Physical Vapor Deposition) technology is adopted to convert solid materials into vapor by physical methods and then condense them into thin films on the substrate.

[0003] During this process, it is inevitable that small foreign objects enter the OLED device (i.e., the film layer), resulting in short circuits in some pixels and forming "non-light-emitting points or slightly dark points". In the industry, generally, the method of "panel aging + module aging" is adopted to repair this hidden danger of foreign objects or stimulate it into a stable defective state, and then the good products are continued for the assembly line operation.

[0004] At present, the aging of PMOLED panels and modules needs to be operated separately, resulting in problems of increased costs and defective rates. For the above problems, no effective solutions have been proposed yet. Content of the Utility Model

[0005] Purpose of the utility model: To provide a PMOLED chip circuit integrating panel aging and module aging to at least solve one of the above problems existing in the prior art.

[0006] Technical solution: A PMOLED chip circuit integrating panel aging and module aging includes: an organic light-emitting diode pixel circuit; a first multiplexing circuit electrically connected to one end of the organic light-emitting diode pixel circuit; and a second multiplexing circuit electrically connected to the other end of the organic light-emitting diode pixel circuit; wherein, by simultaneously turning on or off the first multiplexing circuit and the second multiplexing circuit, panel aging and module aging are integrated.

[0007] Preferably, the organic light-emitting diode pixel circuit includes: an organic light-emitting diode, and storage capacitors are connected in parallel at both ends of the organic light-emitting diode.

[0008] Preferably, the first multiplexing circuit includes: a first switching transistor, the first switching transistor is connected to a first multiplexer, a first end of the first multiplexer is connected to the negative electrode of the organic light-emitting diode, a second end thereof is connected to a signal selection circuit, and a third end thereof is connected to a first voltage node.

[0009] Preferably, the signal selection circuit includes: a voltage common mode unit, which is connected to the pixel non-selected row unit, the pixel non-selected row unit is connected to the pixel selected row unit, and the pixel selected row unit is connected to the low voltage terminal.

[0010] Preferably, the second terminal of the first multiplexer is disposed between the pixel non-selected row unit and the pixel selected row unit.

[0011] Preferably, the second multiplexing circuit includes: a second switching transistor, which is connected to the second multiplexer. The first terminal of the second multiplexer is connected to the positive electrode of the organic light emitting diode, its second terminal is connected to the power supply circuit, and its third terminal is connected to the second voltage node.

[0012] Preferably, the power supply circuit includes: a voltage source, which is connected to the current driving unit, the current driving unit is connected to the reset unit, and the reset unit is connected to the low voltage terminal.

[0013] Preferably, the second terminal of the second multiplexer is disposed between the current driving unit and the reset unit.

[0014] Preferably, the first voltage node and the second voltage node are respectively connected to a controllable voltage source; the first voltage node and the second voltage node are respectively short-circuited;

[0015] Wherein, the controllable voltage source is provided externally or inside the chip.

[0016] Preferably, when the first switching transistor and the second switching transistor are turned on or off simultaneously, the OLED is in the screen aging state or the module aging state respectively.

[0017] Advantageous effects: In the embodiment of the present application, by adding a multiplexing circuit in the IC, and turning on or off the first multiplexing circuit and the second multiplexing circuit simultaneously, the screen aging and the module aging are integrated, achieving the purpose of integrating the screen aging and the module aging, thereby realizing the technical effects of reducing production costs and improving the product qualification rate, and further solving the technical problem that the current PMOLED screen aging and module aging need to be operated separately, resulting in an increase in cost and defective rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the circuit structure of a PMOLED chip integrating screen and module aging of the present invention; and

[0019] Figure 2 is a circuit schematic diagram of a PMOLED chip integrating screen and module aging of the present invention.

[0020] The reference numerals are as follows:

[0021] 10. Organic light-emitting diode pixel circuit;

[0022] 20. First multiplexing circuit;

[0023] 30. Second multiplexing circuit;

[0024] 40. Signal selection circuit;

[0025] 50. Power supply circuit. Detailed implementation manners

[0026] In order to enable those skilled in the art of the present technology to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] In addition, the terms "installed", "set up", "provided with", "connected", "connected to", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0030] For better understanding of the present application, the following explanations are made:

[0031] At present, PMOLED products adopt "panel aging + module aging". Panel aging is carried out before bonding the chips to the panel. A special fixture is used to short-circuit and lead out all the anodes and cathodes on the panel respectively, and then connect them to the positive and negative poles of the power supply of the fixture. Voltage is applied for aging. Since static lighting aging is adopted and the brightness is very high, some pixel foreign matters can be melted, achieving the purpose of repair and screening.

[0032] Module aging: For the products that have undergone panel aging, after bonding the driving chip (IC) and flexible printed circuit (FPC), the module is made. Special fixtures are used for aging. At this time, the pixels are lit dynamically, and the brightness is lower than that during panel aging, further screening and repairing abnormal pixel point defects, etc.

[0033] For the above "panel aging + module aging", separate aging is adopted, increasing the labor cost. In addition, new abnormalities will be introduced during panel aging, such as lead damage, etc.

[0034] As Figure 1-2 shown, the present application relates to a PMOLED chip circuit integrating panel and module aging. The PMOLED chip circuit integrating panel and module aging includes: an organic light-emitting diode pixel circuit 10; as a light-emitting component, it can control light emission according to the input signal.

[0035] A first multiplexing circuit 20, electrically connected to one end of the organic light-emitting diode pixel circuit 10; it can achieve a good electrical connection effect, thus ensuring a good transmission effect of the electrical signal; at the same time, it can also achieve the effect of controlling the signal input at one end of the organic light-emitting diode pixel circuit 10.

[0036] A second multiplexing circuit 30, electrically connected to the other end of the organic light-emitting diode pixel circuit 10; it can achieve a good electrical connection effect, thus ensuring a good transmission effect of the electrical signal; at the same time, it can also achieve the effect of controlling the signal input at the other end of the organic light-emitting diode pixel circuit 10, so as to achieve a good cooperation effect with the first multiplexing circuit 20.

[0037] It should be noted that a multiplexing circuit (Multiplexer, abbreviated as MUX) is a digital logic circuit used to select one signal from multiple input signals and output it. The function of the MUX is similar to an electronic switch. According to the selection of the control signal, one of the input signals is output through the output terminal.

[0038] Typical multiplexers consist of the following components:

[0039] Input signal line: Represents multiple input signals that the MUX can select. For example, a 4:1 MUX has 4 input signal lines; Selection signal line: Determines which input signal is selected to pass through the MUX output. n selection signal lines can select 2^n input signals; Output signal line: The finally selected input signal is output through the MUX output terminal.

[0040] Working principle of the multiplexer:

[0041] If a 4:1 MUX is adopted, there are 4 input signals (I0, I1, I2, I3) and 2 selection signals (S0, S1), and its working principle is as follows:

[0042] According to the combined values of the selection signals S0 and S1, the MUX will select the corresponding input signal and transmit it to the output terminal.

[0043] For example: when S1S0 = 00, output I0; when S1S0 = 01, output I1; when S1S0 = 10, output I2; when S1S0 = 11, output I3.

[0044] Among them, the first multiplexing circuit 20 and the second multiplexing circuit 30 are simultaneously turned on or off to integrate the aging of the screen body and the aging of the module. By electrically connecting the first multiplexing circuit 20 and the second multiplexing circuit 30 to both ends of the organic light-emitting diode pixel circuit 10 respectively, and by controlling the turning on or off of the first multiplexing circuit 20 and the second multiplexing circuit 30, the IC circuit can simultaneously have the two functions of screen body aging and module aging, thereby achieving a good integration effect.

[0045] This application combines the separate aging of the screen body and the module aging into one. After the screen body is completed, the IC and the flexible printed circuit (FPC) are directly bonded to make the module, and the aging of the screen body and the module is carried out in the module link.

[0046] An MUX circuit (multiplexing circuit) is added to the IC. The SW1 and SW1 enable pins are controlled by software. V1 and V2 are connected to a controllable voltage source, and this voltage source can be provided externally or generated internally by the chip; the V1 and V2 of the MUX circuits of all pixels are respectively short-circuited together.

[0047] When SW1 and SW2 are turned on, the OLED undergoes screen body aging; for example, when V2 uses a 15V power supply and V1 uses -5V, the OLED screen body can be aged at 20V voltage.

[0048] When SW1 and SW2 are turned off, after restoring to the conventional IC driving mode, module aging is carried out. Based on the above IC design idea, the "screen body aging + module aging" can be combined for aging, reducing costs and improving product quality.

[0049] When the screen body aging register is enabled in this application, the cathodes and anodes of all OLED pixels can be short-circuited respectively and connected together with a specific voltage, achieving the effect of aging the "screen body aging + module aging" together.

[0050] Specifically, a MUX circuit (multiplexing circuit) is added to the IC; when the MUX enable register is enabled, all OLED cathodes and anodes are short-circuited together respectively, so that the screen body can be aged in the module state.

[0051] From the above description, it can be seen that this application achieves the following technical effects:

[0052] In the embodiment of this application, by adopting the method of adding a multiplexing circuit in the IC, the first multiplexing circuit 20 and the second multiplexing circuit 30 are turned on or off simultaneously to integrate the screen body aging and the module aging, achieving the purpose of integrating the screen body aging and the module aging, thereby achieving the technical effects of reducing production costs and improving the product qualification rate, and further solving the technical problem that the current PMOLED screen body aging and module aging need to be operated separately, resulting in increased costs and defect rates.

[0053] Further, the organic light-emitting diode pixel circuit 10 includes: an organic light-emitting diode, and a storage capacitor is connected in parallel at both ends of the organic light-emitting diode. It can be understood that the OLED is the core light-emitting component in the circuit and will emit light when current passes through; in the pixel circuit, the brightness and color of the OLED are determined by the magnitude of the current passing through it and the driving signal.

[0054] The storage capacitor is used to maintain the voltage state of the selected pixel, so that the OLED can maintain a constant brightness during a frame display.

[0055] Further, the first multiplexing circuit 20 includes: a first switching tube SW1, the first switching tube SW1 is connected to a first multiplexer MUX, a first end of the first multiplexer MUX is connected to the negative electrode of the organic light-emitting diode, a second end thereof is connected to a signal selection circuit 40, and a third end thereof is connected to a first voltage node V1. It can be understood that it can achieve a good electrical connection effect between components, thereby ensuring the normal operation of the first multiplexing circuit 20.

[0056] Further, the signal selection circuit 40 includes: a voltage common mode unit VcomH, the voltage common mode unit VcomH is connected to the pixel non-selected row unit Non-select Row, the pixel non-selected row unit Non-select Row is connected to the pixel selected row unit Selected Row, and the pixel selected row unit Selected Row is connected to the low voltage terminal VLSS. It can be understood that a good electrical connection effect can be achieved, and at the same time, a good signal selection effect can also be achieved.

[0057] VcomH: A voltage signal used to control the non-selected row (Non-select Row).

[0058] Selected Row and Non-select Row: Determine which row of pixels is selected (turned on) or not selected (turned off); when a row is selected, it is connected to the selected row voltage, allowing current to flow through the OLED pixels.

[0059] Further, the second end of the first multiplexer 20 is disposed between the pixel non-selected row unit and the pixel selected row unit. It can be understood that an accurate electrical connection effect can be ensured.

[0060] Further, the second multiplexing circuit 30 includes: a second switching transistor SW2, the second switching transistor SW2 is connected to the second multiplexer MUX, the first end of the second multiplexer MUX is connected to the positive electrode of the organic light emitting diode, its second end is connected to the power supply circuit 50, and its third end is connected to the second voltage node V2. It can be understood that a good electrical connection effect between components can be achieved, thereby ensuring the normal operation effect of the second multiplexing circuit 30.

[0061] Further, the power supply circuit 50 includes: a voltage source VCC, the voltage source VCC is connected to the current drive unit Current Drive, the current drive unit Current Drive is connected to the reset unit Reset, and the reset unit Reset is connected to the low voltage terminal VLSS. It can be understood that a stable power supply effect can be achieved, thereby ensuring the stable operation effect of the circuit.

[0062] Further, the second end of the second multiplexer is disposed between the current drive unit and the reset unit. It can be understood that an accurate electrical connection effect can be ensured.

[0063] Further, the first voltage node V1 and the second voltage node V2 are respectively connected to a controllable voltage source; the first voltage node V1 and the second voltage node V2 are respectively short-circuited;

[0064] Among them, the controllable voltage source is provided externally or internally within the chip. It can be understood that a good connection effect can be achieved, thereby ensuring the normal operation of the circuit.

[0065] Furthermore, when the first switching transistor SW1 and the second switching transistor SW2 are turned on or off simultaneously, the OLED is in the panel aging state or the module aging state respectively. It can be understood that a good control effect can be achieved, so that different states can be switched according to actual usage requirements.

[0066] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. An integrated screen and module aging PMOLED chip circuit, characterized in that: include: Organic light emitting diode pixel circuit (10); A first multiplexing circuit (20) electrically connected to one end of the organic light emitting diode pixel circuit (10); and A second multiplexing circuit (30) electrically connected to the other end of the organic light emitting diode pixel circuit (10); The first multiplexing circuit (20) and the second multiplexing circuit (30) are turned on or off at the same time to integrate screen aging and module aging.

2. The integrated screen and module aging PMOLED chip circuit according to claim 1, characterized in that: The organic light emitting diode pixel circuit (10) comprises an organic light emitting diode, with storage capacitors being arranged in parallel at both ends of the organic light emitting diode.

3. The integrated screen and module aging PMOLED chip circuit according to claim 1, characterized in that: The first multiplexing circuit (20) comprises: a first switch tube, the first switch tube is connected to a first multiplexer, a first end of the first multiplexer is connected to the cathode of an organic light emitting diode, a second end of the first multiplexer is connected to a signal selection circuit (40), and a third end of the first multiplexer is connected to a first voltage node.

4. The integrated screen and module aging PMOLED chip circuit according to claim 3, characterized in that: The signal selection circuit (40) comprises: a voltage common mode unit, the voltage common mode unit is connected to a pixel non-selected row unit, the pixel non-selected row unit is connected to a pixel selected row unit, and the pixel selected row unit is connected to a low voltage terminal.

5. The integrated screen and module aging PMOLED chip circuit according to claim 4, characterized in that: The second end of the first multiplexer is disposed between the pixel non-selected row unit and the pixel selected row unit.

6. The integrated screen and module aging PMOLED chip circuit according to claim 1, characterized in that: The second multiplexing circuit (30) comprises: a second switch tube, the second switch tube is connected to a second multiplexer, a first end of the second multiplexer is connected to the positive electrode of the organic light emitting diode, a second end of the second multiplexer is connected to the power supply circuit (50), and a third end of the second multiplexer is connected to the second voltage node.

7. The integrated screen and module aging PMOLED chip circuit according to claim 6, characterized in that: The power supply circuit (50) comprises: a voltage source, the voltage source is connected to a current driving unit, the current driving unit is connected to a reset unit, and the reset unit is connected to a low voltage terminal.

8. The integrated screen and module aging PMOLED chip circuit according to claim 7, characterized in that: The second end of the second multiplexer is arranged between the current driving unit and the reset unit.

9. The integrated screen and module aging PMOLED chip circuit according to claim 3, characterized in that: The first voltage node and the second voltage node are respectively connected to a controllable voltage source; the first voltage node and the second voltage node are respectively short-circuited; The controllable voltage source is provided externally or internally in the chip.

10. The integrated screen and module aging PMOLED chip circuit according to claim 3, characterized in that: When the first switch tube and the second switch tube are turned on or off at the same time, the OLED is in a screen aging state or a module aging state respectively.

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