CN107564462B

CN107564462B - Display panel

Info

Publication number: CN107564462B
Application number: CN201710005452.2A
Authority: CN
Inventors: 张耕辅; 谢朝桦; 柯瑞峰; 刘同凯; 和津田启史
Original assignee: Innolux Corp
Current assignee: Innolux Corp
Priority date: 2016-06-28
Filing date: 2017-01-04
Publication date: 2021-06-04
Anticipated expiration: 2037-01-04
Also published as: CN113241039A; CN107564462A

Abstract

The display panel comprises a first current source and a first pixel unit. The first pixel unit comprises a first switch and a first light emitting diode. The first switch is electrically connected with the first current source and receives a first scanning signal. When the first scan signal is enabled, the first switch is turned on and receives a first current from the first current source. The first light emitting diode is coupled with the first switch. When the first switch is turned on, a first current flows through the first light emitting diode to light the first light emitting diode.

Description

Display panel

Technical Field

The present disclosure relates to a display panel, and more particularly, to a display panel having light emitting diodes.

Background

The picture tube has been used as a display for a television and a computer because of its excellent picture quality and low cost. However, with the advance of technology, new flat panel displays are developed. The main advantage of the flat panel display is that the total volume of the flat panel display does not change significantly when the flat panel display has a large-sized display panel.

Disclosure of Invention

The present disclosure provides a display panel including a first current source and a first pixel unit. The first pixel unit comprises a first switch and a first light emitting diode. The first switch is electrically connected with the first current source and receives a first scanning signal. When the first scan signal is enabled, the first switch is turned on and receives a first current from the first current source. The first light emitting diode is coupled with the first switch. When the first switch is turned on, a first current flows through the first light emitting diode to light the first light emitting diode.

The present disclosure provides another display panel including a pixel unit. The pixel unit comprises a first transmission switch, a first energy storage element, a first light-emitting unit, a second light-emitting unit, a lightening switch and a level setting unit. The first transmission switch receives a first scanning signal and a first selection signal. The first energy storage element is coupled to the first transmission switch. The first light-emitting unit comprises a first switch and a first light-emitting diode. The first switch is coupled to the first energy storage element. The first light emitting diode is coupled with the first switch. The second light-emitting unit is connected in parallel with the first light-emitting unit and comprises a second switch and a second light-emitting diode. The second light emitting diode is coupled with the second switch. The lighting switch is coupled to the first light-emitting unit and the second light-emitting unit and receives a lighting signal. The level setting unit is coupled to the ignition switch for providing a predetermined level to the ignition switch.

The present disclosure provides another display panel including at least one pixel unit. The pixel unit comprises a first transistor, a second transistor, an energy storage element, a third transistor, a light emitting diode and a sensing element. The first transistor has a first gate, a first drain and a first source. The first grid receives a scanning signal. The first drain electrode receives a data signal. The second transistor has a second gate, a second drain and a second source. The second gate is coupled to the first source. The second drain receives a first operating voltage. The energy storage element is coupled to the first source and the second source. The third transistor has a third gate, a third drain and a third source. The third gate receives a lighting signal. The third source is coupled to the second source. The light emitting diode has an anode and a cathode. The anode is coupled to the third drain. The cathode receives a second operating voltage. The sensing element senses the brightness of the light emitting diode to generate a feedback signal. The feedback signal is used for adjusting the data signal.

Drawings

Fig. 1 is a schematic diagram of a display system of the present disclosure.

Fig. 2A and 2B are possible embodiments of the pixel unit of the present disclosure.

Fig. 3 is another schematic diagram of the display system of the present disclosure.

Fig. 4A and 4B are possible embodiments of the pixel unit of the present disclosure.

Fig. 5A and 5B are other possible embodiments of the pixel unit of the present disclosure.

Fig. 6 is another possible embodiment of a pixel unit according to the present disclosure.

Fig. 7 is another possible embodiment of a pixel cell of the present disclosure.

Fig. 8A and 8B are possible embodiments of the pixel unit of the present disclosure.

Fig. 8C is a schematic diagram of a discharge signal of the present disclosure.

Fig. 9 is a control timing diagram of the display panel of the present disclosure.

Fig. 10 is another possible embodiment of a pixel unit according to the present disclosure.

Fig. 11 is a schematic view of a possible structure of a display panel according to the present disclosure.

Fig. 12 is another possible embodiment of a pixel cell of the present disclosure.

Fig. 13A to 13C illustrate a possible embodiment of a pixel unit according to the present disclosure.

Fig. 14 is another possible embodiment of a pixel cell of the present disclosure.

Fig. 15A and 15B are possible control timing diagrams of the pixel unit of the present disclosure.

[ notation ] to show

100. 300, and (2) 300: a display system;

110. 310: a gate driver;

120. 320, 630, 810, 1410: a source driver;

130. 330 and 1100: a display panel;

SCAN、SCAN₃～SCAN_n、SCAN_a～SCAN_d: scanning a signal;

SCAN₁and CSCAN: a first scanning signal;

SCAN₂DSCAN: a second scanning signal;

DT₁～DT_mand DT: a data signal;

121. 321, 631, 820, 1417: a controller;

SCA₁～SCA_m、SCB₁～SCB_m: a current source;

VDD: a first operating voltage;

VSS: a second operating voltage;

PA₁₁～PA_mn、201～204、401～404、PB₁₁～

PB

_mn500A, 500B, 610, 620, 700, 800A, 800B, 1200, 1300A, 1300B, 1300C, 1400: a pixel unit;

510. 520, the method comprises the following steps: a compensation circuit;

611. 621, 1411: a sensing element;

710: an electrostatic discharge protection circuit;

830: a discharge circuit;

841-843, 921-925, 1502-1504: during the period;

911. 912, 1501: a frame period;

1101: a substrate;

1102. 1109: an insulating layer;

1103: a gate electrode;

1104: a gate dielectric layer;

1105: an insulating layer;

1106: a semiconductor layer;

1107: a drain electrode;

1108: a source electrode;

1110: a metal block;

1121. 1122: a groove;

1405: an energy storage element;

1203. 1303: a first energy storage element;

1215. c _ CS 2: a second energy storage element;

c _ CS 3: a third energy storage element;

1205: a light emitting device;

1207. 1311: turning on a switch;

1209. 1313: a level setting unit;

CS 1: a first selection signal;

CS 2: a second selection signal;

CS 3: a third selection signal;

t21: an N-type transistor;

c _ CS, C _ store: a capacitor;

1211. 1305A, 1305B, 1305C: a first light emitting unit;

1212. 1307A, 1307B, 1307C: a second light emitting unit;

1309A, 1309B, 1309C: a third light emitting unit;

1217: setting a signal;

EM: a lighting signal;

Q₁T1-T3, NT1, NT 2: an N-type transistor;

PT1, PT 2: a P-type transistor;

1201. 1301: a first transfer switch;

1216. 1319: a second transfer switch;

1213. 1315: a third transfer switch;

I₁: a first current;

I₂: a second current;

I₃: a third current;

I₄: a fourth current;

I₅: current flow;

LV127, LV64, LV32, LV 255: a gray scale;

SW₃～SW₄: a switch;

SW₁T11A, T11B, T11C: a first switch;

SW₂T12A, T12B, T12C: a second switch;

T13B, T13C, T22: a third switch;

T13A: a fourth switch;

t23: a fifth switch;

LED₁: a first light emitting diode;

LED₂: a second light emitting diode;

LED₃: a third light emitting diode;

LED₄1409: a light emitting diode;

SF₁、SF₂SFB: a feedback signal;

ND₁、ND₂: a node;

S_DS: a discharge signal;

GND: a ground voltage;

1317 auxiliary energy storage element

1321: a NOR gate circuit;

IN 1: a first input terminal;

IN 2: a second input terminal;

OUT: output end

1401: a first transistor;

1403: a second transistor;

1407: a third transistor;

1413: a memory element;

1415: a gray scale table;

BT: brightness;

1505: and (4) carrying waves.

Detailed Description

In order to make the objects, features and advantages of the present disclosure more comprehensible, embodiments accompanied with figures are described in detail below. The present disclosure provides different embodiments to illustrate technical features of different embodiments of the present disclosure. The configuration of the elements in the embodiments is illustrative and not intended to limit the disclosure. In addition, the reference numerals in the embodiments are partially repeated, and the relevance between different embodiments is not intended for the sake of simplifying the description.

Fig. 1 is a schematic diagram of a display system of the present disclosure. As shown, the display system 100 includes a gate driver 110, a source driver 120, and a display panel 130. In one possible embodiment, the display system 100 is a Personal Digital Assistant (PDA), a cellular phone, a digital camera, a television, a Global Positioning System (GPS), a car display, an aviation display, a digital photo frame (digital photo frame), a notebook computer, or a desktop computer.

The gate driver 110 may generate the SCAN signal SCAN₁～SCAN_n. The source driver 120 can generate the data signal DT₁～DT_m. In the present embodiment, the data signal DT₁～DT_mIs a current signal, but is not intended to limit the disclosure. In other embodiments, the data signal DT₁～DT_mIs a voltage signal.

As shown, the source driver 120 at least has a controller 121 and a current source SCA₁～SCA_m. The controller 121 is used for controlling the current source SCA₁～SCA_m. Current source SCA₁～SCA_mA first operating voltage VDD is received. In one embodiment, the gate driver 110 and the source driver 120 are integrated on a chip and disposed in the display panel 130.

The display panel 130 is coupled to the gate driver 110 and the source driver 120 and has a plurality of pixel units PA₁₁～PA_mn. Each pixel unit receives a scanning signal, a data signal and a second operating voltage VSS. When a specific scanning signal is enabled, the corresponding pixel unit receives a corresponding data signal and presents brightness according to the data signal. In pixel unit PA₁₁For example, when the SCAN signal SCAN₁When enabled, the pixel unit PA₁₁Receiving data signal DT₁And according to the data signal DT₁The brightness is presented. Furthermore, in the present embodiment, the data signal DT₁Is a current signal, so that the pixel unit PA can be adjusted by adjusting the current₁₁The brightness of the presentation.

Fig. 2A is a schematic diagram of a pixel unit according to an embodiment of the disclosure. For convenience of illustration, FIG. 2A shows four pixel units 201-204. Each of the pixel units 201-204 has a switch and a light emitting diode. Since the internal structure and operation principle of the pixel units 201-204 are the same, the pixel unit 201 is taken as an example below. As shown, the pixel unit 201 includes a first switch SW₁And a first light emitting diode LED₁。

First switch SW₁Receiving a first SCAN signal SCAN₁. When the first SCAN signal SCAN₁When enabled, the first switch SW₁Is turned on. In the present embodiment, the first switch SW₁Is an N-type transistor Q₁. The gate of the N-type transistor Q1 receives the first SCAN signal SCAN₁The drain electrode of which receives a data signal DT₁The source electrode of the first LED is coupled with the first LED₁. In other embodiments, an N-type transistor Q₁And may be replaced by P-type transistors.

First light emitting diode LED₁Anode of the transistor is coupled with an N-type transistor Q₁And a cathode of the source receives a second operating voltage VSS. In one possible embodiment, the first light emitting diode LED₁Is a micro light emitting diode (micro led). When the first switch SW₁When turned on, a first current (i.e. data signal DT)₁) Flowing through the first light emitting diode LED₁. Thus, the first light emitting diode LED₁Is illuminated.

Fig. 2B is another possible embodiment of a pixel unit according to the present disclosure. FIG. 2B is similar to FIG. 2A, except that the first light emitting diode LED of FIG. 2B₁Anode of (2) receiving a data signal DT₁The cathode of which is coupled with an N-type transistor Q₁Of the substrate. Since the operation of the pixel unit in fig. 2B is similar to that of the pixel unit in fig. 2A, the description thereof is omitted. In addition, the N-type transistor Q of FIG. 2B₁Or replaced by a P-type transistor.

Fig. 3 is another schematic diagram of the display system of the present disclosure. FIG. 3 is similar to FIG. 1, except that current source SCB of source driver 320 of FIG. 3₁～SCB_mReceives the second operating voltage VSS, and the pixel cell PB₁₁～PB_mnA first operating voltage VDD is received. Since the operation principle of the display system 300 of fig. 3 is similar to that of the display system 100 of fig. 1, the detailed description is omitted.

Fig. 4A is a schematic diagram of a pixel unit according to an embodiment of the disclosure. FIG. 4A is similar to FIG. 2A, except that an N-type transistor Q₁Receives a first operating voltage VDD, and a first light emitting diode LED₁Cathode of (2) receiving a data signal DT₁. When N type transistor Q₁When turned on, the data signal DT₁Flowing through the first light emitting diode LED₁For lighting the first light emitting diode LED₁。

Fig. 4B is a schematic diagram of a pixel unit according to an embodiment of the disclosure. Drawing (A)4B is similar to FIG. 4A, except that the first light emitting diode LED₁An anode receiving a first operating voltage VDD and a cathode coupled to an N-type transistor Q₁Of the substrate. In the present embodiment, an N-type transistor Q₁Source electrode of receiving data signal DT₁. Since the operation of the pixel unit in fig. 4B is similar to that of the pixel unit in fig. 2A, the description thereof is omitted.

Fig. 5A is another possible embodiment of a pixel cell of the present disclosure. FIG. 5A is similar to FIG. 4A, except that the first switch SW of FIG. 5A₁Is a P-type transistor Q₂And the pixel unit 500A further includes a compensation circuit 510. The compensation circuit 510 is coupled to the first switch SW₁With the first light-emitting diode LED₁Can be used for compensating the P-type transistor Q₂Threshold voltage (threshold voltage).

The disclosure does not limit how the compensation circuit 510 compensates the P-type transistor Q₂The threshold voltage of (c). Any detectable P-type transistor Q₂And correcting the data signal DT according to the detection result₁The circuit structure of (1) can be used as the compensation circuit 510. In one possible embodiment, the compensation circuit 510 detects and records the P-type transistor Q during a compensation period₂The compensation circuit 510 utilizes the P-type transistor Q during a data write period₂The threshold voltage of, adjust the data signal DT₁. During a lighting period, the first light emitting diode LED₁According to the adjusted data information DT₁The brightness is presented. Then, during a clearing period, the compensation circuit 510 clears the previously recorded P-type transistor Q₂And re-registering the P-type transistor Q₂The threshold voltage of (c). In other embodiments, the compensation circuit 510 can be applied to at least one of the pixel units shown in fig. 2A and 4A.

Fig. 5B is another possible embodiment of a pixel unit according to the present disclosure. Fig. 5B is similar to fig. 4B, except that a compensation circuit 520 is added to the pixel cell 500B of fig. 5B. Since the characteristics of the compensation circuit 520 are the same as those of the compensation circuit 510 of fig. 5A, the description thereof is omitted. In other embodiments, the compensation circuit 520 can be applied to at least one of the pixel units shown in fig. 2B and 4B.

Fig. 6 is another possible embodiment of a pixel unit according to the present disclosure. For convenience of illustration, fig. 6 shows two

adjacent pixel units

610 and 620. Since the circuit structures of the

pixel units

610 and 620 are similar, the pixel unit 610 is taken as an example. As shown, the pixel unit 610 receives the SCAN signal SCAN₁And data signal DT₁And includes a first switch SW₁A first light emitting diode LED₁And a sensing element 611.

First switch SW₁With the first light-emitting diode LED₁Is the same as the first switch SW of FIG. 4A₁With the first light-emitting diode LED₁Similarly, the description is omitted. When the first switch SW₁When conducting, a first current (i.e. data signal DT)₁) Flowing through the first light emitting diode LED₁. Thus, the first light emitting diode LED₁Is illuminated.

The sensing element 611 senses the first light emitting diode LED₁For generating a feedback signal SF₁. Feedback signal SF₁For adjusting data signal DT₁. In one embodiment, the controller 631 of the source driver 630 outputs the feedback signal SF₁Adjusting current source SC₁For adjusting the current (i.e. the data signal DT) provided to the pixel unit 620₁). Therefore, when the SCAN signal SCAN₂When enabled, the second switch SW₂Is turned on. At this time, a second current (i.e. the adjusted data signal DT)₁) Flows through the second light emitting diode LED₂For lighting the second light emitting diode LED₂. By means of the adjusted data signal DT₁Second light emitting diode LED₂Luminance-compensated first light emitting diode LED₁Brightness drift of (2).

Similarly, when the second light emitting diode LED₂When emitting light, the sensing element 621 senses the second light emitting diode LED₂For generating a feedback signal SF₂. The controller 631 controls the feedback signal SF according to₂Adjusting current source SC₁For adjusting the adjacency of pixel unit 620The brightness of the pixel cell. Therefore, when the brightness of a specific LED drifts, the brightness drift problem can be compensated by adjusting the brightness of the adjacent LEDs. In other embodiments, the sensing element 611 can also be applied to at least one of the pixel units shown in fig. 2A, 2B, 4A, 4B, 5A and 5B.

Fig. 7 is another possible embodiment of a pixel cell of the present disclosure. The pixel cell 700 of fig. 7 is similar to the pixel cell 401 of fig. 4A, except that an electrostatic discharge (ESD) protection circuit 710 is added to the pixel cell 700 of fig. 7. The ESD protection circuit 710 is coupled to the first switch SW₁. When the first light emitting diode LED₁Is welded to the node ND₁And ND₂When an ESD event occurs on the node ND₁Or ND₂Thus destroying the first switch SW₁. Therefore, when the node ND₁Or node ND₂When the voltage is greater than a predetermined value, the ESD protection circuit 710 is turned on to prevent an ESD current from entering the first switch SW₁。

The disclosure does not limit the circuit architecture of the esd protection circuit 710. Any circuit that can release ESD stress can be used as the ESD protection circuit 710. In other embodiments, the esd protection circuit 710 may also be applied to at least one of the pixel units shown in fig. 2A, 2B, 4A, 4B, 5A, 5B and 6.

Fig. 8A is another possible embodiment of a pixel cell of the present disclosure. The pixel cell 800A of fig. 8A is similar to the pixel cell 401 of fig. 4A, except that the pixel cell 800 of fig. 8A has a discharge circuit 830. The discharge circuit 830 is used for discharging a voltage of at least one data line to prevent the residual charges on the data line from affecting the first light emitting diode LED₁Brightness. For convenience of illustration, FIG. 8A shows a single data line DL₁But not to limit the disclosure. In other embodiments, the discharge circuit 830 is coupled to a plurality of data lines. In some embodiments, multiple pixel cells share the same discharge circuit.

When the first switch SW₁When conducting, a first current (i.e. data signal DT)₁) Via data line DL₁Flows into the pixel cell 800A. Thus, the first light emitting diode LED₁Is illuminated. When the first switch SW₁Is not conducted and a discharge signal S_DSWhen enabled, the discharge circuit 830 discharges the data line DL₁Coupled to a low potential (such as the operating voltage VSS or the ground voltage GND) for releasing the data line DL₁The voltage of (c).

The internal architecture of the discharge circuit 830 is not limited by this disclosure. Any capability of releasing data line DL₁The circuit of the voltage on can be used as the discharge circuit 830. In one possible embodiment, a discharge signal S_DSMay be generated by the controller 820 of the source driver 810. In other embodiments, the discharge circuit 830 can be applied to at least one pixel unit shown in fig. 2A, 2B, 4A, 4B, 5A, 5B, 6 and 7.

Fig. 8B is another possible embodiment of a pixel cell of the present disclosure. Fig. 8B is similar to fig. 8A, except that the discharging circuit 830 of fig. 8B is integrated into the source driver 810. As shown, when the controller 820 enables the discharge signal S_DSWhile, the discharging circuit 830 discharges the data line DL₁Coupled to the second operation voltage VSS or the ground voltage GND for releasing the data line DL-₁The voltage of (c).

FIG. 8C is a discharge signal S according to the present disclosure_DSSchematic representation of (a). Symbolic SCAN_a～SCAN_dRepresents the scanning signals of four scanning lines arranged in sequence. For convenience of explanation, it is assumed that a discharge circuit is coupled to all data lines. In the present embodiment, since the discharge circuit is coupled to all the data lines, no scan signal is enabled when the discharge circuit is activated.

For example, during periods 841-843, no scan signal is enabled, and thus, the discharge signal S_DSIs enabled to trigger the discharge circuit. When the discharging circuit is triggered, the discharging circuit couples all the data lines to a low operating voltage (such as VSS or GND) for releasing the voltages on all the data lines.

The present disclosure does not limit the discharge signal S_DSThe number of times it is enabled. In one possible embodimentMiddle, discharge signal S_DSThe enabled number of times is not a fixed value. For example, in period 841, the discharge signal S_DSThe enabled times are less than that in the period 843, the discharge signal S_DSThe number of times it is enabled. In addition, a discharge signal S_DSThe enabled number of times may also be maintained at a constant value. For example, during the period 843, the discharge signal S_DSIs enabled only once. In addition, in other embodiments, the discharge signal S is generated when no scan signal is enabled_DSMay also be disabled, as shown at period 842.

In order to control the brightness of the led of each pixel unit, in one possible embodiment, the same scan signal is enabled multiple times during the same frame period to adjust the brightness of the led. Fig. 9 is a control timing diagram of the display panel of the present disclosure. For illustrative purposes, FIG. 9 shows two

frame periods

911 and 921. During a frame period 911, a first SCAN signal SCAN₁The enabled times are different from the first SCAN signal SCAN during the frame period 912₁The number of times it is enabled.

In addition, when the first SCAN signal SCAN₁When enabled, different currents are provided for the first light emitting diode LED₁So as to control the first light emitting diode LED₁The brightness of (2). For example, in periods 921-924, the first SCAN signal SCAN₁Is enabled and the first light emitting diode LED₁Respectively receive a first current I₁A second current I₂A third current I₃And a fourth current I₄. The disclosure does not limit the first current I₁A second current I₂A third current I₃And a fourth current I₄The relationship between them.

In one possible embodiment, the first current I₁A second current I₂A third current I₃And a fourth current I₄E.g. third current I₃) May be the same as the first current I₁A second current I₂A third current I₃And a fourth current I₄Another (e.g. fourth current I)₄). In another possible embodiment, the first electrodeStream I₁A second current I₂A third current I₃And a fourth current I₄E.g. the second current I₂) May be smaller than the first current I₁A second current I₂A third current I₃And a fourth current I₄Another (e.g. first current I)₁) Or greater than the first current I₁A second current I₂A third current I₃And a fourth current I₄Another (e.g. fourth current I)₄). In other embodiments, the first current I₁A second current I₂A third current I₃And a fourth current I₄At least one of which is equal to 0.

In the present embodiment, assume that the first current I₁Representing gray level LV127, second current I₂Representing gray level LV64, third current I₃And a fourth current I₄Representing gray level LV 32. In this example, the brightness of the pixel unit 201 in the frame period 911 is approximately equal to the brightness corresponding to the gray level LV255(LV127+ LV63+ LV32+ LV 32). Therefore, by controlling the data signal DT₁Thus, the pixel unit can present different brightness.

Fig. 10 is another possible embodiment of a pixel unit according to the present disclosure. FIG. 10 is similar to FIG. 4A, except that a first switch SW₁Indirectly coupled to the first light emitting diode LED₁Of (2) an anode. As shown, the pixel unit 1000 includes a first switch SW₁A capacitor 1004, a P-type transistor 1006, an N-type transistor 1008 and a first LED₁。

In the present embodiment, the first switch SW₁Is an N-type transistor 1002. The gate of the N-type transistor 1002 receives a first SCAN signal SCAN₁A drain receiving a first operating voltage VDD, and a source coupled to the first light emitting diode LED via a P-type transistor 1006₁Of (2) an anode. The capacitor 1004 is coupled between the gate and the source of the N-type transistor 1002. The P-type transistor 1006 has a gate receiving a turn-off signal Goff, a source coupled to the source of the N-type transistor 1002, and a drain coupled to the first LED₁Of (2) an anode. First light emitting diode LED₁Cathode of (2) receiving a data signal DT₁. The N-type transistor 1008 has a gate receiving a turn-off signal Goff, a drain coupled to the source of the N-type transistor 1002, and a source coupled to the first LED₁The cathode of (1).

In this embodiment, when the first SCAN signal SCAN₁When enabled, the N-type transistor 1002 is turned on to charge the capacitor 1004. At this time, when the turn-off signal Goff is low, the P-type transistor 1006 is turned on to light the first light emitting diode LED₁. When the first SCAN signal SCAN₁When not enabled, the charge stored in the capacitor 1004 can still turn on the N-type transistor 1002, so that the first light emitting diode LED₁The light emission is continued. When the turn-off signal Goff is high, the P-type transistor 1006 is not turned on, so that the first light emitting diode LED₁No light is emitted. At this time, the N-type transistor 1008 is turned on, so that the charge stored in the capacitor 1004 can be released.

In the present embodiment, the data signal DT₁Is a constant current. By controlling the first light emitting diode LED₁Can control the light emitting time of the first light emitting diode LED₁Providing different brightness. Furthermore, the first SCAN signal SCAN₁Need not be enabled continuously as long as the first SCAN signal SCAN₁The enabled time is sufficient for the capacitor 1004 to store enough charge, and the N-type transistor 1002 can be turned on continuously.

Fig. 11 is a schematic view of a possible structure of a display panel according to the present disclosure. As shown, the display panel 1100 includes a substrate 1101, an insulating layer 1102, a gate electrode 1103, a gate dielectric 1104, an insulating layer 1105, a semiconductor layer 1106, a drain 1107, a source 1108, a metal block 1110, and an insulating layer 1109. In the present embodiment, the gate electrode 1103, the drain 1107, and the source 1108 form a transistor, which can be used as the first switch SW in the pixel unit 201 of fig. 2A, for example₁。

In addition, in the embodiment, the insulating layer 1109 is disposed on the substrate 1101 and has a plurality of grooves for placing the light emitting diodes. For convenience of illustration, fig. 11 shows the

grooves

1121 and 1122. The

recesses

1121 and 1122 are used for positioningFirst light emitting diode LED as shown in FIG. 2A₁Two pins of (2). In one possible embodiment, the recess 1121 is used for placing the first light emitting diode LED₁Such as an anode or a cathode. In this example, the recess 1122 is used to place the first LED₁Such as a cathode or an anode.

The disclosure does not limit the forming method of the

recesses

1121 and 1122. In one embodiment, the

grooves

1121 and 1122 are etched using a yellow light. Then, a yellow light process and a metal film forming process are used to fill metal (such as copper, tin or indium) into the

recesses

1121 and 1122. Finally, the first light emitting diode LED is used₁The two leads are soldered (bonded) to the metal layers of the

recesses

1121 and 1122, respectively. By forming the

grooves

1121 and 1122, the alignment error during welding can be avoided or corrected, and the welding stability can be increased.

Fig. 12 is another possible embodiment of a pixel cell of the present disclosure. As shown, the pixel unit 1200 includes a first transfer switch 1201, a first energy storage element 1203, a light emitting device 1205, a lighting switch 1207, and a level setting unit 1209. The first transmission switch 1201 receives a first scan signal CSCAN and a first selection signal CS 1. When the first scan signal CSCAN is enabled, the first transmission switch 1201 transmits a first selection signal CS1 to the first energy storage element 1203. In the embodiment, the first transfer switch 1201 is an N-type transistor T21, a gate thereof receives the first scan signal CSCAN, a drain thereof receives the first selection signal CS1, and a source thereof is coupled to the first energy storage element 1203. In other embodiments, the first transfer switch 1201 is a P-type transistor.

The first energy storage element 1203 is coupled to the first transfer switch 1201. When the first transmission switch 1201 transmits the first selection signal CS1 to the first energy storage element 1203, the first energy storage element 1203 is charged according to the first selection signal CS 1. The present disclosure does not limit the kind of the first energy storage element 1203. Any device capable of storing energy may be used as the first energy storage element 1203. In this embodiment, the first energy storage element 1203 is a capacitor C _ CS. One end of the capacitor C _ CS is coupled to the first transmission switch 1201, and the other end thereof receives the second operating voltage VSS.

The light-emitting device 1205 has a plurality of light-emitting units. A first light emitting unit of the light emitting units may be set as a predetermined light emitting unit, and the other light emitting units may be set as spare light emitting units. During a lighting period, the preset lighting unit is lighted, and the standby lighting unit is not lighted. When the first light-emitting unit fails, a new preset light-emitting unit is assigned from the spare light-emitting units to ensure the normal operation of the pixel unit 1200. For convenience of description, fig. 12 shows the first light emitting unit 1211 and the second light emitting unit 1212. In other embodiments, the light emitting device 1205 may have more light emitting units.

As shown, the first light emitting unit 1211 is connected in parallel with the second light emitting unit 1212. In one possible embodiment, a setting signal 1217 is used to set one of the first light-emitting unit 1211 and the second light-emitting unit 1212 as a default light-emitting unit and the other of the first light-emitting unit 1211 and the second light-emitting unit 1212 as a spare light-emitting unit. When the preset light emitting unit emits light, the standby light emitting unit may not emit light. When the preset light-emitting unit fails, the standby light-emitting unit can emit light instead.

The lighting switch 1207 is coupled to the first light emitting unit 1211 and the second light emitting unit 1212, and receives a lighting signal EM. When the lighting signal EM is enabled, the lighting switch 1207 is turned on. At this time, a light emitting unit in the light emitting device 1205 is lit. In the embodiment, the lighting switch 1207 is an N-type transistor T3, but the disclosure is not limited thereto. In other embodiments, the ignition switch 1207 is a P-type transistor. As shown, the gate of the N-type transistor T3 receives the lighting signal EM, the drain thereof is coupled to the light emitting device 1205, and the source thereof is coupled to the level setting unit 1209.

The level setting unit 1209 is coupled to the lighting switch 1207 for providing a predetermined level to the lighting switch 1207. In the present embodiment, the level setting unit 1209 includes a second pass switch 1216, a third pass switch 1213, and a second energy storage element 1215. The second transfer switch 1216 receives the data signal DT and a second scan signal DSCAN. In one possible embodiment, the second scan signal DSCAN is equal to the first scan signal CSCAN. In this case, a scan signal, such as DSCAN, may be omitted.

In this embodiment, the second pass switch 1216 is an N-type transistor T2. The gate of the N-type transistor T2 receives the second scan signal DSCAN, the drain thereof receives the data signal DT, and the source thereof is coupled to the third transfer switch 1213 and the second energy storage element 1215. In other embodiments, the second pass switch 1216 is a P-type transistor.

The third transfer switch 1213 couples the second transfer switch 1216 and the lighting switch 1207. In the present embodiment, the third transfer switch 1213 is an N-type transistor T1. The N-type transistor T1 has a gate coupled to the source of the N-type transistor T2, a drain coupled to the source of the N-type transistor T3, and a source receiving the second operating voltage VSS. In other embodiments, the third transfer switch 1213 is formed of a P-type transistor.

The second energy storage element 1215 is coupled to the second transfer switch 1216 and the third transfer switch 1213. In the embodiment, the second energy storage element 1215 is a capacitor C _ store, but is not limited to the disclosure. In other embodiments, any element capable of storing energy may be used as the second energy storage element 1215. As shown, the capacitor C _ store has one end coupled to the gate of the N-type transistor T1 and the other end coupled to the source of the N-type transistor T1.

When the second scan signal DSCAN is enabled, the second transmitting switch 1216 is turned on. Accordingly, the second energy storage element 1215 is charged according to the data signal DT and the third transfer switch 1213 is turned on. At this time, the lighting switch 1207 receives the second operating voltage VSS (i.e., the preset level). The present disclosure does not limit the type of the data signal DT. In one embodiment, the data signal DT may be a current signal or a voltage signal.

When the lighting signal EM is enabled, the lighting switch 1207 is turned on. At this time, the third transfer switch 1213 is turned on according to the data signal DT stored in the second energy storage element 1215, and a predetermined light emitting unit in the light emitting device 1205 is turned on according to the voltage stored in the first energy storage element 1203. Therefore, the preset light emitting unit presents corresponding brightness.

Fig. 13A is a schematic diagram of a pixel unit according to an embodiment of the disclosure. The pixel unit 1300A includes a first transfer switch 1301, a first energy storage element 1303, a first light emitting unit 1305A, a second light emitting unit 1307A, a third light emitting unit 1309A, a lighting switch 1311, and a level setting unit 1313. Since the characteristics of the first transmission switch 1301, the first energy storage element 1303, the lighting switch 1311, and the level setting unit 1313 are similar to the characteristics of the first transmission switch 1201, the first energy storage element 1203, the lighting switch 1207, and the level setting unit 1209 in fig. 12, further description is omitted.

In the present embodiment, the first light emitting unit 1305A includes a first switch T11A and a first light emitting diode LED₁. The first switch T11A is an N-type transistor, the gate of which is coupled to the first transfer switch 1301 and the drain of which is coupled to the first LED₁And a source thereof is coupled to the ignition switch 1311. First light emitting diode LED₁Receives a first operating voltage VDD. In other embodiments, the first switch T11A is a P-type transistor.

The second light emitting unit 1307A comprises a second energy storage element C _ CS2, a second switch T12A, a third switch T22, and a second light emitting diode LED₂. In one embodiment, the third switch T22 is an N-type transistor having a gate receiving the first scan signal CSCAN, a drain receiving the second selection signal CS2, and a source coupled to the second energy storage element C _ CS2 and the second switch T12A. When the first scan signal CSCAN is enabled, the third switch T22 transmits the second selection signal CS 2. In other embodiments, the third switch T22 may be a P-type transistor.

One end of the second energy storage element C _ CS2 is coupled to the second switch T12A, and the other end thereof receives the second operating voltage VSS. When the third switch T22 is turned on, the second energy storage element C _ CS2 charges according to the second selection signal CS 2. In the embodiment, the second energy storage element C _ CS2 is a capacitor, but not limited to the disclosure. Any device capable of storing energy may be used as the second energy storage element C _ CS 2.

The second switch T12A is coupled to the third switch T22, the second energy storage element C _ CS2 and the second LED₂. In one possible embodiment, the secondThe switch T12A is an N-type transistor, the gate thereof is coupled to the third switch T22 and the second energy storage element C _ CS2, and the drain thereof is coupled to the second LED₂And a source thereof is coupled to the ignition switch 1311. In other embodiments, the second switch T12A is a P-type transistor. Second light emitting diode LED₂Receives a first operating voltage VDD and has a cathode coupled to a second switch T12A.

The third light emitting unit 1309A includes a third energy storage element C _ CS3, a fourth switch T13A, a fifth switch T23, and a third light emitting diode LED₃. Since the circuit architecture of the third light emitting unit 1309A is the same as that of the second light emitting unit 1307A, detailed description thereof is omitted. In addition, in the present embodiment, the second scan signal DSCAN received by the level setting unit 1313 is equal to the first scan signal CSCAN.

In one possible embodiment, when the first selection signal CS1 is at a first level (e.g., high level) and the second selection signal CS2 and the third selection signal CS3 are at a second level (e.g., low level), it indicates that the first light-emitting unit 1305A is assigned as a default light-emitting unit and the second light-emitting unit 1307A and the third light-emitting unit 1309A are assigned as spare light-emitting units. At this time, when the first scan signal CSCAN is enabled, the first transmission switch 1301 transmits the first selection signal CS1 to the first energy storage element 1303, so as to charge the first energy storage element 1303, and the level setting unit 1313 provides a predetermined level (e.g., the second operating voltage VSS) to the lighting switch 1311. At this time, the auxiliary energy storage element 1317 in the level setting unit 1313 is charged according to the data signal DT. Since the second selection signal CS2 and the third selection signal CS3 are at the second level, the second switch T12A and the fourth switch T13A are not conductive.

When the lighting signal EM is enabled, the lighting switch 1311 is turned on. At this time, the third transfer switch 1315 in the level setting unit 1313 is turned on according to the data signal DT stored in the auxiliary energy storage element 1317, and the first switch T11A is turned on according to the voltage stored in the first energy storage element 1303. Thus, the first light emitting diode LED₁Is illuminated.

In other embodiments, when the second selection message is receivedThe signal CS2 is at a first level (e.g., high level) and the first selection signal CS1 and the third selection signal CS3 are at a second level (e.g., low level), indicating that the second light emitting unit 1307 is set as a preset light emitting unit. Therefore, when the first scan signal CSCAN is enabled, the second selection signal CS2 charges the second energy storage element C _ CS 2. When the lighting switch 1311 is turned on, the second switch T12A is turned on according to the voltage stored in the second energy storage element C _ CS2, and the third transfer switch 1315 of the level setting unit 1313 is turned on according to the voltage of the auxiliary energy storage element 1317. Thus, the second light emitting diode LED₂Is illuminated.

Fig. 13B is a schematic diagram of a pixel unit according to an embodiment of the disclosure. The pixel unit 1300B includes a first transfer switch 1301, a first energy storage element 1303, a first light emitting unit 1305B, a second light emitting unit 1307B, a third light emitting unit 1309B, a turn-on switch 1311, a level setting unit 1313, and an nor gate 1321. Since the characteristics of the first transmission switch 1301, the first energy storage element 1303, the lighting switch 1311, and the level setting unit 1313 in fig. 13B are similar to those of the first transmission switch 1301, the first energy storage element 1303, the lighting switch 1311, and the level setting unit 1313 in fig. 13A, detailed description thereof is omitted.

The first light emitting unit 1305B includes a first switch T11B and a first light emitting diode LED₁. The first switch T11B is an N-type transistor having a gate coupled to the first energy storage element 1303 and a drain coupled to the first LED₁And a source thereof is coupled to the ignition switch 1311. First light emitting diode LED₁Receives a first operating voltage VDD.

The second light emitting unit 1307B includes a second switch T12B and a second light emitting diode LED₂. The second switch T12B is an N-type transistor having a gate coupled to the output OUT of the NOR gate 1321 and a drain coupled to the second LED₂And a source thereof is coupled to the ignition switch 1311. Second light emitting diode LED₂Receives a first operating voltage VDD.

The third light emitting unit 1309B comprises a third switch T13B and a third light emitting diode LED₃. The third switch T13B is an N-type transistor having a gate coupled to the second input IN2 of the NOR gate 1321 and a switch 1323 having a drain coupled to the third LED₃And a source thereof is coupled to the ignition switch 1311. Third light emitting diode LED₃Receives a first operating voltage VDD.

The switch 1323 is configured to provide the first operating voltage VDD or the second operating voltage VSS to the third switch T13B. In one embodiment, the switch 1323 has a first path and a second path. The first path is used to transmit the first operating voltage VDD to the third switch T13B. The second path is used for transmitting the second operating voltage VSS to the third switch T13B. In one embodiment, the first path or the second path may be blown by a laser to control the gate voltage of the third switch T13B. In another embodiment, the switch 1323 determines to transmit the first operating voltage VDD or the second operating voltage VSS to the third switch T13B according to a control signal (not shown).

The nor gate 1321 has a first input terminal IN1, a second input terminal IN2, and an output terminal OUT. The first input terminal IN1 is coupled to the first switch T11B and the first energy storage element 1303. The second input terminal IN2 is coupled to the third switch T13B. The output terminal OUT is coupled to the second switch T12B. In the present embodiment, the nor gate 1321 includes P-type transistors PT1 and PT2 and N-type transistors NT1 and NT 2. The P-type transistor PT1 has a gate coupled to the first input IN1 and a source receiving the first operating voltage VDD. The gate of the P-type transistor PT2 is coupled to the second input IN2, and the source thereof is coupled to the drain of the P-type transistor PT 1. The N-type transistor NT1 has a gate coupled to the first input terminal IN1, a drain coupled to the drain of the P-type transistor PT2, and a source receiving the second operating voltage VSS. The N-type transistor NT2 has a gate coupled to the second input IN2, a drain coupled to the drain of the P-type transistor PT2, and a source receiving the second operating voltage VSS.

IN the present embodiment, the first light-emitting unit 1305B, the second light-emitting unit 1307B or the third light-emitting unit 1309B is used as a predetermined light-emitting unit by controlling the levels of the first input terminal IN1 and the second input terminal IN 2. For example, when the first input IN1 is at a first level (e.g., high level)) And the second input terminal IN2 is at a second level (e.g., low level), the first light emitting unit 1305B is set to a predetermined light emitting unit. At this time, second light emitting unit 1307B and third light emitting unit 1309B serve as spare light emitting units. In this example, when the first scan signal CSCAN is enabled, the first transfer switch 1301 transmits the first selection signal CS1 to the first energy storage element 1303 for charging the first energy storage element 1303, and the second transfer switch 1319 transmits the data signal DT to the auxiliary energy storage element 1317 for charging the auxiliary energy storage element 1317. When the lighting signal EM is enabled, the lighting switch 1311 is turned on. At this time, the first switch T11B is turned on according to the voltage stored in the first energy storage element 1303. In addition, the third transfer switch 1315 in the level setting unit 1313 is turned on according to the voltage of the auxiliary energy storage element 1317. Thus, the first light emitting diode LED₁Is illuminated.

IN another embodiment, when the first input terminal IN1 and the second input terminal IN2 are at the second level (e.g., low level), the P-type transistor PT1 and the P-type transistor PT2 are turned on, and thus the second light emitting unit 1307B is set as a predetermined light emitting unit. Since the first input terminal IN1 and the second input terminal IN2 are at the second level, the first light-emitting unit 1305B and the third light-emitting unit 1309B serve as spare light-emitting units. In this example, when the first scan signal CSCAN is enabled, the first transfer switch 1301 transmits the first selection signal CS1 to the first energy storage element 1303 for charging the first energy storage element 1303, and the second transfer switch 1319 transmits the data signal DT to the auxiliary energy storage element 1317 for charging the auxiliary energy storage element 1317. When the lighting signal EM is enabled, the lighting switch 1311 is turned on. At this time, the second switch T12B is turned on according to the voltage stored in the first energy storage element 1303. In addition, the third transfer switch 1315 in the level setting unit 1313 is turned on according to the voltage of the auxiliary energy storage element 1317. Thus, the second light emitting diode LED₂Is illuminated.

IN other embodiments, when the first input terminal IN1 is at the second level (e.g., low level) and the second input terminal IN2 is at the first level (e.g., high level), the third switch T13B is turned on, so that the third light emitting unit 1309B is set to oneThe light emitting unit is preset. At this time, since the first switch T11B and the second switch T12B are not turned on, the first light emitting unit 1305B and the second light emitting unit 1307B function as spare light emitting units. In this example, when the first scan signal CSCAN is enabled, the first transfer switch 1301 transfers the first selection signal CS1 to the first energy storage element 1303 for charging the first energy storage element 1303, and the second transfer switch 1319 transfers the data signal DT to charge the auxiliary energy storage element 1317. When the lighting signal EM is enabled, the lighting switch 1311 is turned on. At this time, the third switch T13B is turned on according to the voltage stored in the first energy storage element 1303. In addition, the third transfer switch 1315 in the level setting unit 1313 is turned on according to the voltage of the auxiliary energy storage element 1317. Thus, the third light emitting diode LED₃Is illuminated.

Fig. 13C is another possible embodiment of a pixel cell of the present disclosure. The pixel unit 1300C includes a first transfer switch 1301, a first energy storage element 1303, a first light emitting unit 1305C, a second light emitting unit 1307C, a third light emitting unit 1309C, a switch 1311 for turning on, a level setting unit 1313, and an nor gate 1321. Since the characteristics of the first transmission switch 1301, the first energy storage element 1303, the lighting switch 1311, the first light emitting unit 1305C, the second light emitting unit 1307C, and the third light emitting unit 1309C in fig. 13C are similar to the characteristics of the first transmission switch 1301, the first energy storage element 1303, the lighting switch 1311, the first light emitting unit 1305B, the second light emitting unit 1307B, and the third light emitting unit 1309B in fig. 13B, no further description is given.

In the present embodiment, the second scan signal DSCAN is different from the first scan signal CSCAN. In one possible embodiment, the second scan signal DSCAN is not enabled when the first scan signal CSCAN is enabled, and the first scan signal CSCAN is not enabled when the second scan signal DSCAN is enabled. In addition, in fig. 13C, the method for designating the first light-emitting unit 1305C, the second light-emitting unit 1307C, or the third light-emitting unit 1309C as a predetermined light-emitting unit is the same as the method for designating fig. 13B, and thus the description thereof is omitted.

When the first scan signal CSCAN is enabled, the first transfer switch 1301 transfers the reference signal REF to the first energy storage element 1303. Therefore, the first energy storage element 1303 is charged according to the reference signal REF. When the second scan signal DSCAN is enabled, the second transfer switch 1319 transfers the reference signal REF to the auxiliary energy storage device 1317. Therefore, the auxiliary energy storage element 1317 charges according to the reference signal REF. When the lighting signal EM is enabled, the lighting switch 1311 is turned on. At this time, the preset light emitting unit is lit.

Fig. 14 is another possible embodiment of a pixel cell of the present disclosure. As shown, the pixel cell 1400 includes a first transistor 1401, a second transistor 1403, an energy storage device 1405, a third transistor 1407, a light emitting diode 1409, and a sensing device 1411.

The gate of the first transistor 1401 receives a SCAN signal SCAN, and the drain thereof receives a data signal DT. In the embodiment, the first transistor 1401 is N-type, but it is not limited to the disclosure. In other embodiments, the first transistor 1401 may be replaced by a P-type transistor. The present disclosure does not limit the type of the data signal DT. The data signal DT may be a voltage signal or a current signal.

The gate of the second transistor 1403 is coupled to the source of the first transistor 1401 and the energy storage element 1405, and the drain thereof receives the first operating voltage VDD. In one possible embodiment, the second transistor 1403 is the same kind as the first transistor 1401. As shown, the first transistor 1401 and the second transistor 1403 are both N-type, but are not intended to limit the present disclosure. In other embodiments, the second transistor 1403 is of a different kind than the first transistor 1401. For example, one of the first transistor 1401 and the second transistor 1403 is N-type, and the other of the first transistor 1401 and the second transistor 1403 is P-type.

The energy storage element 1405 has one end coupled to the source of the first transistor 1401 and the other end coupled to the source of the second transistor 1403. In the embodiment, the energy storage device 1405 is a capacitor, but not limited to the disclosure. Any element capable of storing energy may be used as the energy storage element 1405.

The gate of the third transistor 1407 receives an illumination signal EM, and the source thereof is coupled to the source of the second transistor 1403. In this embodiment, the kind of the third transistor 1407 is different from that of the first transistor 1401. As shown, the first transistor 1401 is N-type and the third transistor 1407 is P-type, but not limited to this disclosure. In other embodiments, the third transistor 1407 is the same kind as the first transistor 1401 or the second transistor 1403.

The anode of the light emitting diode 1409 is coupled to the drain of the third transistor 1407, and the cathode thereof receives the second operating voltage VSS. The sensing element 1411 senses the brightness of the light emitting diode 1409 for generating a feedback signal SFB. The present disclosure does not limit the kind of the sensing element 1411. Any device capable of detecting the brightness of light can be used as the sensing device 1411. In one possible embodiment, the sensing element 1411 is a light emitting diode.

In the present embodiment, a source driver 1410 receives and records the feedback signal SFB. As shown, the source driver 1410 has a memory element 1413 for recording the sensing result of each sensing element. In addition, the source driver 1410 has a gray scale table 1415. The gray scale table 1415 records brightness values corresponding to different data signals.

In one embodiment, the controller 1417 generates the appropriate data signal DT to control the led 1409 to emit a predetermined brightness according to the recording result of the gray scale table 1415. The controller 1417 then knows whether the brightness of the led 1409 is equal to the predetermined brightness according to the feedback signal SFB. When the brightness of the led 1409 is not equal to the predetermined brightness, the controller 1417 controls at least one of the SCAN signal SCAN, the data signal DT and the illumination signal EM to adjust the brightness of the led 1409. In another possible embodiment, the controller 1417 does not directly adjust the brightness of the led 1409. In this case, the controller 1417 may adjust the brightness of the pixel unit (not shown) adjacent to the pixel unit 1400 to compensate for the brightness drift of the led 1409.

Fig. 15A is a possible control timing diagram of the pixel unit according to the present disclosure. Referring to fig. 14, during a frame period 1501, the SCAN signal SCAN is enabled once. When the SCAN signal SCAN is enabled, the first transistor 1401 is turned on. The energy storage element 1405 is charged according to the data signal DT. Since the lighting signal EM is enabled, the third transistor 1407 is turned on and the light emitting diode 1409 is lit. When the SCAN signal SCAN is not enabled, the second transistor 1403 is turned on according to the voltage stored in the energy storage element 1405. Therefore, during the period 1502, the light emitting diode 1409 is lit, wherein the symbol BT denotes the luminance of the light emitting diode 1409.

In period 1503, if the controller 1417 knows that the brightness of the led 1409 is not equal to a predetermined brightness, the controller 1417 is disabled to illuminate the signal EM. Therefore, the light emitting diode 1409 stops emitting light. During the period 1504, the controller 1417 again enables the lighting signal EM. Therefore, the light emitting diode 1409 emits light again. In the present embodiment, the controller 1417 adjusts the duration of the period 1503 according to the difference between the actual brightness of the led 1409 and the preset brightness. The longer the total light emitting time of the led 1409 is, the brighter the led 1409 exhibits. In another possible embodiment, the controller 1417 adjusts the brightness of the light emitting diode 1409. In this example, during the period 1504, the luminance of the light emitting diode 1409 may be higher or lower than that during the period 1502.

Fig. 15B is a possible control timing diagram of the pixel unit according to the disclosure. FIG. 15B is similar to FIG. 15A, except that when the LED 1409 is not emitting light, the controller 1417 transmits an additional carrier 1505 through the pixel unit 1400 for controlling the peripheral devices near the display panel.

For example, the user may send a control command to the display panel using a remote control or a mobile phone, and the controller 1417 generates the additional carrier 1505 according to the control command. When the electronic device near the display panel receives the extra carrier 1505, a specific action is performed, such as the desk lamp is lighted or the cooling air is activated. In another possible embodiment, the extra carrier generated by the controller 1417 is integrated into the light emitted by the led 1409. When the led 1409 emits a light, the light has a carrier wave to drive an external device. The external device acts according to the carrier wave on the light to light the desk lamp or start the cold air.

Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be understood as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Moreover, unless expressly stated otherwise, the definition of a term in a general dictionary shall be construed as being consistent with its meaning in the context of the relevant art and shall not be construed as an idealized or overly formal definition.

Although the present disclosure has been described with reference to preferred embodiments, it is not intended to be limited thereto, and that modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present disclosure. For example, the systems, devices, or methods disclosed by the embodiments of the present disclosure may be implemented in physical embodiments of hardware, software, or a combination of hardware and software. Therefore, the protection scope of the present disclosure should be determined by the appended claims.

Claims

1. A display panel, comprising:

a first current source;

a second current source;

a first pixel cell comprising:

a first switch electrically connected to the first current source and receiving a first scan signal, wherein when the first scan signal is enabled, the first switch is turned on and receives a first current from the first current source; and

a first light emitting diode coupled to the first switch, wherein when the first switch is turned on, the first current flows through the first light emitting diode to light the first light emitting diode; and

a first sensing element for sensing the brightness of the first LED to generate a first feedback signal;

a second pixel unit including:

a second switch electrically connected to the second current source and receiving a first scan signal, wherein when the first scan signal is enabled, the second switch is turned on and receives a second current from the second current source; and

a second light emitting diode coupled to the second switch, wherein when the second switch is turned on, the second current flows through the second light emitting diode to light the second light emitting diode;

a third pixel unit including:

a third switch receiving a second scan signal, wherein the third switch is turned on when the second scan signal is enabled;

a third light emitting diode coupled to the third switch, wherein when the third switch is turned on, a third current flows through the third light emitting diode to light the third light emitting diode; and

the second sensing element senses the brightness of the third light-emitting diode and is used for generating a second feedback signal; and

and a controller coupled to the first sensing element and the second sensing element, wherein the controller adjusts the first current source according to the first feedback signal or the second feedback signal.

2. The display panel of claim 1, further comprising:

the compensation circuit is provided with a first end and a second end, wherein the first end is coupled with the first switch, the second end is coupled with the first light-emitting diode, and the compensation circuit is used for compensating the critical voltage of the first switch.

3. The display panel of claim 1, further comprising:

the ESD protection circuit is coupled to the first switch.

4. The display panel of claim 1, further comprising:

the discharge circuit is coupled to the data line and used for releasing the voltage on the data line.

5. The display panel of claim 4, wherein the discharge circuit discharges the voltage on the data line when the first and third switches are not turned on.

6. The display panel of claim 1, wherein the first pixel unit further comprises:

a capacitor coupled to the first switch;

a P-type transistor connected in series between the first switch and the first light emitting diode; and

the N-type transistor is connected in series with the first switch, wherein the grid electrode of the P-type transistor is coupled with the grid electrode of the N-type transistor.

7. The display panel of claim 1, further comprising:

a substrate; and

and the insulating layer is positioned on the substrate and comprises a first groove and a second groove, wherein the first light-emitting diode is provided with a first electrode and a second electrode, the first groove is used for placing the first electrode, and the second groove is used for placing the second electrode.