Organic light emitting diode display device

Abstract

The present disclosure provides a display device. The display device comprises an organic light emitting diode panel, a driving device and a plurality of pull-down resistors. The organic light emitting diode panel comprises a plurality of organic light emitting diodes which are arranged in a plurality of rows and a plurality of columns of an array. The driving device is electrically connected to the organic light-emitting diode panel through a plurality of first driving lines and a plurality of second driving lines, and each first driving line is electrically connected to a cathode of an organic light-emitting diode arranged in the same row. And each second driving line is electrically connected to the anodes of the organic light-emitting diodes arranged in the same column. Each pull-down resistor is electrically connected between an individual second driving line and a grounding end.

Description

Technical Field

[0001] This disclosure relates to an organic light-emitting diode (OLED) display device, and more particularly to an OLED display device designed to prevent accidental activation. Background Technology

[0002] Organic Light Emitting Diode (OLED) display panels can be divided into active-matrix organic light-emitting diode (AMOLED) display panels and passive-matrix organic light-emitting diode (PMOLED) display panels. The display area in an OLED display panel can include a dot matrix area and / or an image area. The pixels in the dot matrix area are mainly used to display images, such as videos, based on dot matrix data signals, while the pixels in the image area are mainly used to display images, such as battery images or network signal images on electronic devices.

[0003] Passive matrix display panels are widely used in various electronic devices with display functions. However, the driving method of passive matrix display panels can lead to various driving errors, such as image retention (false lighting). Therefore, it is important to avoid driving errors in passive matrix display panels. Summary of the Invention

[0004] This disclosure provides a display device. The display device includes an organic light-emitting diode (OLED) panel, a driving device, and a plurality of pull-down resistors. The OLED panel includes a plurality of OLEDs arranged in a plurality of rows and columns of an array. The driving device is electrically connected to the OLED panel via a plurality of first driving lines and a plurality of second driving lines, wherein each first driving line is electrically connected to the cathode of an OLED disposed in the same row, and each second driving line is electrically connected to the anode of an OLED disposed in the same column. Each pull-down resistor is electrically connected between a particular second driving line and a ground terminal. Attached Figure Description

[0005] Figure 1 This is a schematic diagram of an organic light-emitting diode (OLED) display device according to certain embodiments of the present disclosure.

[0006] Figure 2 The present disclosure provides a circuit diagram of an organic light-emitting diode display device according to certain embodiments.

[0007] Figure 3 A top view of an organic light-emitting diode display device according to certain embodiments of this disclosure. Detailed Implementation

[0008] The following disclosure provides many different embodiments or examples for implementing various features of this application. Specific examples of components and configurations are described below to simplify the disclosure. Of course, these are merely examples and are not intended to limit the scope of this application. For example, the following description of forming a first feature on or above a second feature may include embodiments where the first and second features are in direct contact, or embodiments where other features are formed between the first and second features, thus the first and second features are not in direct contact. Furthermore, component symbols and / or letters may be repeated in different examples within this application. This repetition is for simplification and clarity, and does not govern the relationship between the different embodiments and / or the architectures discussed.

[0009] Furthermore, this application may use spatial correspondence terms, such as "below," "lower," "lower," "higher," "higher," and similar terms, to describe the relationship between one component or feature and another component or feature in the drawings. Spatial correspondence terms are used to include different orientations of the device in use or operation, in addition to those described in the drawings. The device may be positioned (rotated 90 degrees or otherwise), and the spatial correspondence descriptions used in this application may be interpreted accordingly.

[0010] Although the numerical ranges and parameters disclosed in this broad disclosure are approximate, the values ​​described in the specific embodiments are as precise as possible. However, any numerical value inherently includes some error due to the standard deviation obtained from individual test measurements. Furthermore, as herein, "about" generally means within 10%, 5%, 1%, or 0.5% of a given value or range. Alternatively, the term "about" means within an acceptable standard error of an average value considered by those generally skilled in the art. Except in operational / working examples, or unless specifically indicated, all numerical ranges, quantities, values, and proportions disclosed herein, such as amounts of material, time periods, temperatures, operating conditions, proportions of quantities, and the like, should be understood to be modified by the term "about" in all cases. Therefore, unless stated to the contrary, the numerical parameters disclosed in this disclosure and the claims are approximate values ​​that may vary as needed. Each numerical parameter should be interpreted at least according to the number of significant figures reported and with the application of common rounding techniques. In this document, a range may be expressed as from one endpoint to another, or between two endpoints. Unless otherwise stated, all ranges disclosed herein include endpoints.

[0011] Figure 1 This is a schematic diagram of an organic light-emitting diode (OLED) display device according to certain embodiments of the present disclosure.

[0012] OLED display device 100 includes an OLED panel 110, a driving device 120, a plurality of pull-up resistors R1, and a plurality of pull-down resistors R2. The OLED panel 110 is a dot matrix formed by organic light-emitting diodes. The driving device 120 is electrically connected to the OLED panel 110 via a plurality of driving lines (or scan lines) 130 and a plurality of driving lines (or data lines) 140. Each driving line 130 is electrically connected to the power supply terminal VCC via a pull-up resistor R1, and each driving line 140 is electrically connected to the ground terminal GND via a pull-down resistor R2. In some embodiments, the pull-up resistors R1 and R2 have the same resistance value. Notably, the pull-up resistors R1 and R2 are low-resistance resistors with high resistance values, for example, about 1 MΩ. In some embodiments, the driving device 120 is a driving integrated circuit (IC) or a driving chip, and controls the display content of the OLED panel 110 via the driving lines 130 and 140. The OLED panel 110 may be a passive matrix (PM) panel. In some embodiments, the OLED panel 110 is a common cathode OLED panel.

[0013] Figure 2 The present disclosure provides a circuit diagram of an OLED display device according to certain embodiments.

[0014] exist Figure 2 In this embodiment, the OLED panel 110 includes 25 organic light-emitting diodes (OLEDs) 10, arranged in multiple rows (row1-row5) and multiple columns (col1-col5) of the array. The anodes of the OLEDs 10 arranged in the same column are electrically connected to a common driving line 140. For example, the anodes of the OLEDs 10 in column col1 are electrically connected to driving line 1401, the anodes of the OLEDs 10 in column col2 are electrically connected to driving line 1402, the anodes of the OLEDs 10 in column col3 are electrically connected to driving line 1403, the anodes of the OLEDs 10 in column col4 are electrically connected to driving line 1404, and the anodes of the OLEDs 10 in column col5 are electrically connected to driving line 1405. Furthermore, each driving line 140 is connected to a corresponding pull-down resistor R2.

[0015] The cathodes of organic light-emitting diodes (OLEDs) 10 arranged in the same row are electrically connected to a common drive line 130. For example, the cathodes of OLEDs 10 in row 1 are electrically connected to drive line 1301, those in row 2 are electrically connected to drive line 1302, those in row 3 are electrically connected to drive line 1303, those in row 4 are electrically connected to drive line 1304, and those in row 5 are electrically connected to drive line 1305. Furthermore, each drive line 130 is connected to a corresponding pull-up resistor R1.

[0016] Figure 2 The embodiment described uses 5 drive lines 1301-1305, 5 drive lines 1401-1405, 5 pull-up resistors R1, 5 pull-down resistors R2, and 25 organic light-emitting diodes 10 as examples. The number and arrangement of drive lines 130, 140, 10, pull-up resistors R1, and pull-down resistors R2 are not limited to this. In the OLED display device 100, the number of pull-up resistors R1 is the same as the number of drive lines 140, and the number of pull-down resistors R2 is the same as the number of drive lines 130. Furthermore, the number of drive lines 140 is the same as the number of columns col1-col5, and the number of drive lines 130 is the same as the number of rows row1-row5.

[0017] The drive unit 120 includes a scan driver 122 and a source driver 124. For simplicity, Figure 2 Other circuits or components of the drive unit 120, such as controllers and memory, will be omitted.

[0018] Scan driver 122 provides individual scan signals to each drive line 130 to provide the scan signals to the cathodes of organic light-emitting diodes 10 disposed in the same row. In this embodiment, the scan signal has a disable voltage or an enable voltage. In some embodiments, the enable voltage is the same as the ground voltage at ground terminal GND, and the disable voltage is the same as the power supply voltage at power supply terminal VCC. When the scan signal has an enable voltage, the drive device 120 scans the organic light-emitting diodes 10 connected to the drive line 130. Conversely, when the scan signal has a disable voltage, the drive device 120 does not scan the organic light-emitting diodes 10 connected to the drive line 130.

[0019] Source driver 124 provides a drive signal (drive current or drive voltage) to the anodes of organic light-emitting diodes 10 arranged in the same column via individual drive lines 140. In some embodiments, the drive signal provided by source driver 124 has a fixed current value or a fixed voltage value. In some embodiments, the drive signal provided by source driver 124 has a variable current value or a variable voltage value to adjust the brightness of the organic light-emitting diodes 10.

[0020] Based on the sequential scanning operation of the scan driver 122 on the drive lines 1301-1305, the source driver 124 can synchronously output drive signals to the drive lines 1401-1405 to drive the OLED array of the OLED panel 110. For example, when the scan driver 122 applies an enable voltage (such as a ground voltage or other voltage) to the drive line 1303, the source driver 124 selectively outputs drive signals to the drive line 1403 to drive the organic light-emitting diodes 10 (hereinafter referred to as 10B) located in column col3 and row 3 of the OLED panel 110, and the organic light-emitting diodes 10B will be lit.

[0021] In traditional OLED displays, the anodes of organic light-emitting diodes (OLEDs) often have high-resistivity loops due to the interconnects on the printed circuit board, which can easily lead to crosstalk and accidental lighting. For example, when any OLED in the array is lit, the anodes of other unlit OLEDs with a common cathode may be partially lit due to reverse current flow and the high-resistivity loop. This means that the anodes of these unlit OLEDs may have unexpected voltages, such as less than about 0.5V. Furthermore, the OLEDs 10 that are accidentally lit by these unexpected voltages have lower brightness.

[0022] In the OLED display device 100, the pull-down resistor R2 connected to the drive line 140 prevents the organic light-emitting diodes 10 of the OLED panel 110 from being accidentally turned on. In the OLED display device 100, the weak current generated by the high-resistivity circuit can be discharged to the ground terminal GND through the pull-down resistor R2, so there will be no unexpected voltage at the anode of other organic light-emitting diodes in the common cathode, that is, other organic light-emitting diodes (such as the organic light-emitting diodes 10 located in row 3 and columns col1, col2, col4 and col5) will not be accidentally turned on.

[0023] On the other hand, through individual pull-up resistors R1, the voltage of drive lines 1301-1305 can be weakly pulled up to the power supply terminal VCC, thus preventing drive line 130 from being affected by other circuits and incorrectly scanning the OLED panel 110 when scan driver 122 does not provide a scan signal to drive line 130.

[0024] Figure 3 This is a top view of an OLED display device according to certain embodiments of the present disclosure.

[0025] The OLED display device 100 includes a substrate 200. The substrate 200 is selected from flexible or non-flexible materials. In some embodiments, the flexible material is made of a polymer, and the polymer may be selected from polyethylene terephthalate, polycarbonate, polyacrylic acid, and combinations thereof. In some embodiments, the non-flexible material may be selected from printed circuit boards, glass, quartz, or acrylic sheets.

[0026] The driving device 120 is disposed on the front side (e.g., the first surface) of the substrate 200. The OLED panel 110 (shown in dashed lines) is disposed on the back side (e.g., the second surface opposite the first surface) of the substrate 200. In some embodiments, the OLED panel 110 and the driving device 120 may be disposed on the same surface (e.g., the first surface or the second surface) of the substrate 200. A plurality of driving lines 130 and 140 from the driving device 120 (not shown) Figure 3 The drive lines 130 and 140 are configured via the front or internal winding layer of the substrate 200 to connect to the connector 210. The connector 210 is disposed on the front of the substrate 200 and electrically connected to the OLED panel 110 to electrically connect the drive lines from the drive device 120 to the back of the OLED panel 110. Thus, drive signals (current or voltage) and scan signals from the drive device 120 can be provided to the OLED panel 110 via the connector 210.

[0027] exist Figure 3 In some embodiments, multiple pull-down resistors R2 are arranged along the X direction and disposed between connector 210 and drive device 120. In some embodiments, the pull-down resistors R2 have the same resistance value. In some embodiments, the pull-down resistors R2 have different resistance values. For example, according to each drive line 140 (not shown) Figure 3 With different winding configurations on the substrate 200, the resistance value of the pull-down resistor R2 can be adjusted accordingly to ensure the transmission of the drive signal.

[0028] exist Figure 3 In this embodiment, the multiple pull-up resistors R1 are divided into two groups and disposed on opposite sides of the connector 210. For example, the first group of pull-up resistors R1 is arranged along the Y direction and disposed on the left side of the connector 210, and the second group of pull-up resistors R1 is arranged along the Y direction and disposed on the right side of the connector 210. As previously described, each pull-down resistor R2 is connected to its corresponding drive line 140 (not shown). Figure 3 Each pull-up resistor R1 is connected to its corresponding drive line 130 (not shown). Figure 3 In some embodiments, the pull-up resistors R1 have the same resistance value. In other embodiments, the pull-up resistors R1 have different resistance values. For example, depending on each drive line 130 (not shown in...), Figure 3 In different winding configurations of the substrate 200, the resistance value of the pull-up resistor R1 can be adjusted accordingly to ensure the transmission of the scan signal. In some embodiments, the pull-up resistor R1 and pull-down resistor R2 disposed on the front side of the substrate 200 overlap with the OLED panel 110 disposed on the second side of the substrate 200.

[0029] According to the OLED display device 100 disclosed herein, by setting a pull-down resistor R2 on the substrate 200 and electrically connecting it to the anode of the organic light-emitting diode 10 in the OLED panel 110, an unexpected weak current on the substrate 200 can be discharged to the ground terminal GND, thereby preventing the organic light-emitting diode 10 in the OLED panel 110 from being erroneously driven.

[0030] The foregoing outlines some features of the embodiments, thus enabling those skilled in the art to better understand various aspects of this disclosure. Those skilled in the art should understand that this disclosure can be readily used as a basis for designing or modifying other processes and structures to achieve the same purpose and / or the same advantages as the embodiments of this application. Those skilled in the art should also understand that this equivalent architecture does not depart from the spirit and scope of this disclosure, and that various changes, substitutions, and replacements can be made without departing from the spirit and scope of this disclosure.

[0031] Furthermore, the scope of this application is not limited to the specific embodiments of the processes, machinery, manufacturing, material composition, means, methods, and steps described in the specification. Those skilled in the art will understand from the disclosure herein that existing or future processes, machinery, manufacturing, material composition, means, methods, or steps that have the same function or achieve substantially the same results as the corresponding embodiments described herein can be used based on this disclosure. Therefore, such processes, machinery, manufacturing, material composition, means, methods, or steps are included within the scope of this application.

[0032] Explanation of symbols in attached drawings

[0033] 10 Organic Light Emitting Diodes

[0034] 100 OLED display devices

[0035] 110 OLED panel

[0036] 120 drive unit

[0037] 122 Scan Driver

[0038] 124 source drivers

[0039] 130 drive line

[0040] 1301-1305 Drive Line

[0041] 140 drive line

[0042] 1401-1405 Drive Line

[0043] 200 substrates

[0044] 210 connector

[0045] columns col1-col5

[0046] rows 1-5

[0047] R1 pull-up resistor

[0048] R2 pull-down resistor

[0049] VCC power supply

[0050] GND (Ground) terminal.

Claims

1. A display device, comprising: An organic light-emitting diode panel, comprising multiple organic light-emitting diodes arranged in multiple rows and multiple columns of an array; The driving device is electrically connected to the organic light-emitting diode panel via a plurality of first driving lines and a plurality of second driving lines, wherein each first driving line is electrically connected to the cathode of an organic light-emitting diode disposed in the same row, and each second driving line is electrically connected to the anode of an organic light-emitting diode disposed in the same column. as well as Multiple pull-down resistors, each of which is electrically connected between a particular second drive line and a ground terminal.

2. The display device according to claim 1, wherein the plurality of pull-down resistors have the same or different resistance values.

3. The display device according to claim 1, wherein the number of the plurality of pull-down resistors is the same as the number of the plurality of columns in the array.

4. The display device according to claim 1, further comprising: Multiple pull-up resistors, each of which is electrically connected between a particular first drive line and a power supply terminal.

5. The display device according to claim 4, wherein the plurality of pull-up resistors have the same or different resistance values.

6. The display device of claim 4, wherein the number of the plurality of pull-up resistors is the same as the number of the plurality of rows of the array.

7. The display device according to claim 1, further comprising: substrate, The driving device and the plurality of pull-down resistors are disposed on the first surface of the substrate, the organic light-emitting diode panel is disposed on the second surface or the first surface of the substrate, and the first surface is disposed relative to the second surface.

8. The display device according to claim 7, further comprising: A connector is disposed on the first surface of the substrate. The plurality of first driving lines and the plurality of second driving lines are electrically connected to the organic light-emitting diode panel via the connector.

9. The display device according to claim 8, wherein on the first surface of the substrate, the plurality of pull-down resistors are disposed between the driving device and the connector.

10. The display device according to claim 8, further comprising: Multiple pull-up resistors, each of which is electrically connected between a particular first drive line and a power supply terminal.

11. The display device according to claim 10, wherein the plurality of pull-up resistors are disposed on the first surface of the substrate.

12. The display device of claim 11, wherein the plurality of pull-up resistors are divided into a first group and a second group, and on the first surface of the substrate, the first group is disposed on a first side of the connector, and the second group is disposed on a second side of the connector, the first side being opposite to the second side.

13. The display device of claim 12, wherein on the first surface of the substrate, the plurality of pull-down resistors are disposed between the first group and the second group.

14. The display device according to claim 10, wherein the plurality of pull-up resistors and the plurality of pull-down resistors have the same or different resistance values.

15. The display device according to claim 1, wherein the organic light-emitting diode panel is a passive matrix panel.

Images