TWI745229B - Pixel brightness compensation structure of stretchable display - Google Patents

Abstract

A pixel brightness compensation structure of a stretchable display includes a pixel unit, a first transistor, and a variable capacitor. A first electrode of the first transistor is electrically connected to a first electrode of the variable capacitor. A gate electrode of the first transistor is electrically connected to a second electrode of the variable capacitor. A second electrode of the first transistor is electrically connected to the pixel unit. The variable capacitor is arranged on a stretchable substrate. The capacitance value of the variable capacitor is increased when the stretchable substrate is stretched.

Description

Pixel brightness compensation structure of stretchable display

The present invention relates to a display, especially a stretchable display.

Stretchable displays have characteristics such as stretchable, bendable, foldable, or rollable. When the stretchable display is stretched, the pixels of the stretchable display maintain the same luminous brightness as before being stretched, and the pixel pitch increases, so that the number of pixels per unit area is reduced, and dark areas appear ( dark zone). Therefore, when the stretchable display is stretched, the display brightness per unit area will decrease, resulting in poor display effect after stretching.

The invention provides a pixel brightness compensation structure of a stretchable display, which can compensate the luminous brightness of the pixels after the stretchable display is stretched.

The pixel brightness compensation structure of the stretchable display provided by the present invention includes a pixel unit, a first transistor, and a variable capacitor. The first electrode of the first transistor is electrically connected to the first electrode of the variable capacitor. The gate electrode of the transistor is electrically connected to the second electrode of the variable capacitor, and the second electrode of the first transistor is electrically connected to the pixel unit. The variable capacitor is arranged on the stretchable substrate, and when the stretchable substrate is pulled When extending, the first electrode and the second electrode of the variable capacitor are close to each other, which increases the capacitance value of the variable capacitor.

In an embodiment of the present invention, the second electrode of the variable capacitor has a first end and a second end. The first end is adjacent to the pixel unit and away from the first electrode, and the second end is adjacent to the first electrode and away from the picture. For the element unit, when the stretchable substrate is stretched, the first end of the second electrode approaches the first electrode.

In an embodiment of the present invention, the above-mentioned stretchable substrate includes a first substrate and a second substrate, the first electrode of the variable capacitor is disposed on the first substrate, and the second electrode of the variable capacitor is disposed on the The second substrate, when the stretchable substrate is stretched, the first substrate and the second substrate are displaced relative to each other in the first direction, and the first electrode and the second electrode of the variable capacitor are in the first direction. Approach each other upwards.

In an embodiment of the present invention, the first direction is parallel to the direction in which the stretchable substrate is stretched.

In an embodiment of the present invention, the first direction is perpendicular to the direction in which the stretchable substrate is stretched.

The present invention also provides a pixel brightness compensation structure for a stretchable display, including a pixel unit, a first transistor, and a variable capacitor. The first electrode of the first transistor is electrically connected to the first electrode of the variable capacitor. The gate electrode of a transistor is electrically connected to the second electrode of the variable capacitor, and the second electrode of the first transistor is electrically connected to the pixel unit. The variable capacitor is arranged on the stretchable substrate. When the stretchable substrate is During stretching, the first electrode or the second electrode of the variable capacitor is stretched along the direction in which the stretchable substrate is stretched, so that the capacitance value of the variable capacitor is increased.

In an embodiment of the present invention, when the stretchable substrate is stretched, the first electrode and the second electrode of the variable capacitor are close to each other, so that the capacitance value of the variable capacitor is increased.

The present invention also provides a stretchable display provided with a stretchable substrate. The stretchable substrate includes an island structure and a bridge structure. The island structure is provided with a pixel unit and a first transistor, and the bridge structure is provided with a variable capacitor. , The first electrode of the first transistor is electrically connected to the first electrode of the variable capacitor, the gate of the first transistor is electrically connected to the second electrode of the variable capacitor, and the second electrode of the first transistor is electrically connected to the pixel unit, Wherein, when the stretchable substrate is stretched, the first electrode and the second electrode of the variable capacitor are close to each other, which increases the capacitance value of the variable capacitor.

The present invention also provides a stretchable display provided with a stretchable substrate. The stretchable substrate includes an island structure and a bridge structure. The island structure is provided with a pixel unit and a first transistor, and the bridge structure is provided with a variable capacitor. , The first electrode of the first transistor is electrically connected to the first electrode of the variable capacitor, the gate of the first transistor is electrically connected to the second electrode of the variable capacitor, and the second electrode of the first transistor is electrically connected to the pixel unit, When the stretchable substrate is stretched, the first electrode or the second electrode of the variable capacitor is stretched along the direction in which the bridge structure is stretched, so that the capacitance value of the variable capacitor is increased.

In the present invention, the first electrode of the first transistor is electrically connected to the first electrode of the variable capacitor, the gate of the first transistor is electrically connected to the second electrode of the variable capacitor, and when the stretchable display is stretched, the The capacitance value of the variable capacitor increases. Therefore, when writing data, the compensation speed of the gate voltage of the first transistor becomes slower as the capacitance value of the variable capacitor increases, which leads to a longer voltage difference between the first electrode and the gate of the first transistor. The extension is high, and it can provide a larger luminous current for the pixel unit. That is, the present invention can increase the luminance of pixels after the stretchable display is stretched, and can improve the problem of the brightness per unit area dimming after the stretchable display is stretched.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following specific examples are given in conjunction with the accompanying drawings, which are described in detail as follows.

The pixel brightness compensation structure provided by the embodiments of the present invention can be applied to stretchable displays, such as mobile phone screens, computer screens, wearable devices, or other electronic products that use stretchable displays.

FIG. 1 is a schematic circuit diagram of the pixel brightness compensation structure of the first embodiment of the present invention. In the first embodiment, the pixel brightness compensation structure 11 of the stretchable display 10 includes a pixel unit OLED, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a second transistor. The five transistors T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the variable capacitor CSTR, and the capacitor CST. The pixel unit OLED is an Organic Light-Emitting Diode (OLED), and the first transistor T1 to the eighth transistor T8 are P-type transistors, but the invention is not limited thereto.

In the first embodiment, the first electrode T1-1 of the first transistor T1 is electrically connected to the first electrode CSTR-1 of the variable capacitor CSTR and the operating voltage OVDD, and the gate electrode T1-G of the first transistor T1 is electrically connected The second electrode CSTR-2 of the variable capacitor CSTR and the second electrode T1-2 of the first transistor T1 are electrically connected to the first electrode T2-1 of the second transistor T2. The gate electrode T2-G of the second transistor T2 is electrically connected to the light-emitting signal EM[N], the second electrode T2-2 of the second transistor T2 is electrically connected to the first electrode OLED-1 of the pixel unit OLED, and the pixel unit OLED The second electrode OLED-2 is electrically connected to the operating voltage OVSS. The first electrode T3-1 of the third transistor T3 is electrically connected to the gate electrode T3-G of the third transistor T3 and the scan signal S1[N+1], which can be regarded as equivalent to a diode. The second electrode T3-2 is electrically connected to the first electrode OLED-1 of the pixel unit OLED.

In the first embodiment, the first electrode T4-1 of the fourth transistor T4 is electrically connected to the gate electrode T1-G of the first transistor T1, and the gate electrode T4-G of the fourth transistor T4 is electrically connected to the fifth transistor. The gate electrode T5-G of T5 and the scan signal S2[N], the second electrode T4-2 of the fourth transistor T4 is electrically connected to the first electrode T5-1 of the fifth transistor T5 and the first electrode T5-1 of the sixth transistor T6. Electrode T6-1. The second electrode T5-2 of the fifth transistor T5 is electrically connected to the second electrode T1-2 of the first transistor T1. The gate electrode T6-G of the sixth transistor T6 is electrically connected to the scanning signal S1[N], and the second electrode T6-2 of the sixth transistor T6 is electrically connected to the reference voltage VREF.

In the first embodiment, the first electrode T7-1 of the seventh transistor T7 is electrically connected to the reference voltage VREF, the gate electrode T7-G of the seventh transistor T7 is electrically connected to the luminous signal EM[N], and the seventh transistor T7 The second electrode T7-2 is electrically connected to the first electrode CST-1 of the capacitor CST and the first electrode T8-1 of the eighth transistor T8. The second electrode CST-2 of the capacitor CST is electrically connected to the first electrode T4-1 of the fourth transistor T4. The gate electrode T8-G of the eighth transistor T8 is electrically connected to the scanning signal S2[N], and the second electrode T8-2 of the eighth transistor T8 is electrically connected to the data voltage VDATA.

2A and 2A are schematic diagrams of the circuit waveforms of the pixel brightness compensation structure of the first embodiment of the present invention before stretching, and FIG. 2B is the circuit of the pixel brightness compensation structure of the first embodiment of the present invention after stretching Schematic diagram of the wave pattern. Please refer to Figure 1, Figure 2A, and Figure 2B together. Comparing the waveforms of the voltage VG in Figures 2A and 2B, it can be seen that when the variable capacitance CSTR increases due to the stretch of the stretchable display 10, time t1 to time During t2, the compensation speed of the voltage VG of the gate T1-G of the first transistor T1 slows down and is less easily compensated to the operating voltage OVDD minus the threshold voltage Vth1 of the first transistor T1, denoted as OVDD-Vth1. At this time, the voltage VG of the gate electrode T1-G of the first transistor T1 is relatively low, which will cause the voltage difference between the first electrode T1-1 of the first transistor T1 and the gate electrode to be large and can provide a larger current. Then, when the second transistor T2 is turned on by receiving the light-emitting signal EM[N], the second electrode T1-2 of the first transistor T1 is electrically connected to the first electrode OLED-1 of the pixel unit OLED. The light-emitting current of the unit OLED increases, so that the brightness of the pixel unit OLED increases, and the brightness of the stretchable display 10 after being stretched is improved.

FIG. 3A is a partial schematic diagram of the stretchable display device according to the first embodiment of the present invention before being stretched. 3B is a partial schematic diagram of the stretchable display according to the first embodiment of the present invention after being stretched. Please refer to FIG. 1, FIG. 3A, and FIG. 3B together. In the first embodiment, the stretchable display 10 is provided with a stretchable substrate. The stretchable substrate includes an island structure Is and a bridge structure Br. The island structure Is It is equipped with a pixel unit OLED, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, and a The eight transistors T8, and the capacitor CST, and the bridge structure Br are provided with a variable capacitor CSTR, but the invention is not limited to this. In other embodiments, the first transistor T1, the second transistor T2, the third transistor T3, and the second transistor The four transistors T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, or the capacitor CST may also be provided in the bridge structure Br. The material of the stretchable substrate may include Polyimide (PI), but is not limited thereto.

4A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the first embodiment of the present invention. 4B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the first embodiment of the present invention. Please refer to FIG. 3A, FIG. 3B, FIG. 4A, and FIG. 4B together. For a pixel unit OLED, from a cross-sectional view, the island structure Is is in a straight shape, the bridge structure Br is L-shaped, and the island structure Is and the bridge structure Br are connected and the stretchable substrate is in a concave shape. The notch of the font faces the direction in which the pixel unit OLED is away from other pixel units OLED when stretched. The first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitor CSTR are respectively arranged on both sides of the L-shape of the bridge structure Br, and the first end Ed1 of the second electrode CSTR-2 of the variable capacitor CSTR is adjacent to the island structure Is At the junction with the bridge structure Br and away from the L-shaped corner of the bridge structure Br, the second end Ed2 of the second electrode CSTR-2 of the variable capacitor CSTR is adjacent to the L-shaped corner of the bridge structure Br and away from the island structure Is and the bridge structure The Br connection point, that is, the second electrode CSTR-2 of the variable capacitor CSTR has a first terminal Ed1 and a second terminal Ed2. The first terminal Ed1 is adjacent to the pixel unit OLED and away from the first electrode CSTR- of the variable capacitor CSTR. 1. The second end Ed2 is adjacent to the first electrode CSTR-1 of the variable capacitor CSTR and away from the pixel unit OLED. When the stretchable substrate is stretched, the island structures Is move away from each other, the angle of the L-shaped corner of the bridge structure Br decreases, and the first end Ed1 of the second electrode CSTR-2 of the variable capacitance CSTR goes to the first electrode CSTR -1 is close, that is, when the stretchable substrate is stretched, the first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitor CSTR are close to each other, so the capacitance value of the variable capacitor CSTR increases.

5A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the second embodiment of the present invention, and FIG. 5B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the second embodiment of the present invention. Please refer to FIGS. 5A and 5B together. In the second embodiment, the circuit of the pixel brightness compensation structure 11 is the same as that of the first embodiment, and will not be repeated here. In the second embodiment, the stretchable substrate includes a first substrate 111 and a second substrate 112, which are disposed opposite to each other. The first electrode CSTR-1 of the variable capacitor CSTR is disposed on the first substrate 111. The second electrode CSTR-2 of the variable capacitance CSTR, the pixel unit OLED, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, and the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, and the capacitor CST are disposed on the second substrate 112, but not limited to this. In other embodiments, the first transistor T1, the second transistor T2, the third transistor The transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, or the capacitor CST may also be provided on the first substrate 111.

In the second embodiment, the first direction a1 is defined as the direction in which the stretchable substrate is stretched parallel to, that is, the left and right directions in the cross-sectional view. Before the stretchable substrate is stretched, the first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitance CSTR are separated by a distance d21 in the first direction a1. When the stretchable substrate is stretched along the first direction a1, the first substrate 111 and the second substrate 112 are displaced relative to each other along the first direction a1. For example, the second substrate 112 is shifted to the right with respect to the first substrate 111, so the first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitor CSTR are close to each other to a distance in the first direction a1. d22, to increase the capacitance of the variable capacitor CSTR. Preferably, when the stretchable substrate is stretched to the limit, the first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitance CSTR are closest in the first direction a1, for example, the distance d22 approaches zero At this time, the variable capacitor CSTR has the largest capacitance value.

6A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the third embodiment of the present invention, and FIG. 6B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the third embodiment of the present invention. Please refer to FIGS. 6A and 6B together. In the third embodiment, the circuit of the pixel brightness compensation structure 11 is the same as that of the first embodiment, and will not be repeated here. In the third embodiment, the stretchable substrate includes a first substrate 111 and a second substrate 112, which are disposed opposite to each other. The first electrode CSTR-1 of the variable capacitor CSTR is disposed on the first substrate 111. The second electrode CSTR-2 of the variable capacitor CSTR is disposed on the second substrate 112, and the rest of the circuit elements can refer to the description of the second embodiment, which will not be repeated here.

In the third embodiment, the first direction a2 is defined as the direction perpendicular to the stretchable substrate being stretched, that is, the vertical direction in the cross-sectional view. Before the stretchable substrate is stretched, the first electrode CSTR-1 and the second electrode of the variable capacitor CSTR are separated by a distance d31 in the first direction a2. When the stretchable substrate is stretched in a direction perpendicular to the first direction a2, the stretchable substrate deforms and becomes thinner, so the first substrate 111 and the second substrate 112 are displaced relative to each other along the first direction a2 The proximity and the first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitor CSTR are close to each other to a distance d32 in the first direction a2, so that the capacitance value of the variable capacitor CSTR increases.

7A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the fourth embodiment of the present invention, and FIG. 7B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the fourth embodiment of the present invention. Please refer to FIGS. 7A and 7B together. In the fourth embodiment, the circuit of the pixel brightness compensation structure 11 is the same as that of the first embodiment, and will not be repeated here. In the fourth embodiment, the stretchable substrate includes a first substrate 111 and a second substrate 112, which are disposed opposite to each other. The first electrode CSTR-1 of the variable capacitor CSTR is disposed on the first substrate 111. The second electrode CSTR-2 of the variable capacitor CSTR is disposed on the second substrate 112, and the rest of the circuit elements can refer to the description of the third embodiment, which will not be repeated here.

In the fourth embodiment, the first direction a3 is defined as the direction parallel to the stretchable substrate being stretched, that is, the left and right directions in the cross-sectional view. The variable capacitance CSTR uses, for example, carbon nanomaterials and has stretchable properties. Before the stretchable substrate is stretched, the second electrode CSTR-2 of the variable capacitance CSTR has a width d41 along the first direction a3. When the stretchable substrate is stretched along the first direction a3, the second electrode CSTR-2 of the variable capacitor CSTR is also stretched to the width d42 along the first direction a3, because the stretched width d42 is greater than the width d41, so the capacitance value of the variable capacitor CSTR increases. In other embodiments, it is also possible that the first electrode CSTR-1 of the variable capacitor CSTR has a stretchable property, or both the first electrode CSTR-1 and the second electrode CSTR-2 of the variable capacitor CSTR have a stretchable property. Stretch characteristics.

In other embodiments, the above-mentioned embodiments can also be combined. For example, combining the second embodiment with the third embodiment, the first electrode and the second electrode of the variable capacitor can be close to each other in the left-right direction and the up-down direction in the cross-sectional view, so that the variable capacitor Increase the capacitance value; or refer to any one of the first to third embodiments, and use the variable capacitor with stretchable characteristics as described in the fourth embodiment as the variable capacitor in the fourth embodiment, thereby combining Advantages of different embodiments. In addition, the circuit of the brightness compensation structure is not limited to the above-mentioned embodiment.

In the present invention, the first electrode of the first transistor is electrically connected to the first electrode of the variable capacitor, the gate of the first transistor is electrically connected to the second electrode of the variable capacitor, and when the stretchable display is stretched, the The capacitance value of the variable capacitor increases. Therefore, when writing data, the compensation speed of the gate voltage of the first transistor becomes slower as the capacitance value of the variable capacitor increases, which leads to a longer voltage difference between the first electrode and the gate of the first transistor. The extension is high, and it can provide a larger luminous current for the pixel unit. That is, the present invention can increase the luminance of pixels after the stretchable display is stretched, and can improve the problem of the brightness per unit area dimming after the stretchable display is stretched.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.

10: Stretchable display 11: Pixel brightness compensation structure 111: The first substrate 112: second substrate OLED: pixel unit T1: The first transistor T2: second transistor T3: third transistor T4: The fourth transistor T5: fifth transistor T6: sixth transistor T7: seventh transistor T8: Eighth Transistor CSTR: Variable capacitance CST: Capacitance T1-1, T2-1, T3-1, T4-1, T5-1, T6-1, T7-1, T8-1, OLED-1, CSTR-1, CST-1: first electrode T1-2, T2-2, T3-2, T4-2, T5-2, T6-2, T7-2, T8-2, OLED-2, CSTR-2, CST-2: second electrode T1-G, T2-G, T3-G, T4-G, T5-G, T6-G, T7-G, T8-G: gate Br: bridge structure Is: island structure OVDD, OVSS: operating voltage EM[N]: Luminous signal S1[N], S2[N], S1[N+1]: Scan signal VREF: Reference voltage VDATA: data voltage VG: Voltage Vth1: critical voltage t1, t2: time Ed1: first end Ed2: second end a1, a2, a3: first direction d21, d22, d31, d32: distance d41, d42: width

FIG. 1 is a schematic circuit diagram of the pixel brightness compensation structure of the first embodiment of the present invention; 2A is a schematic diagram of the waveform of the circuit before stretching of the pixel brightness compensation structure of the first embodiment of the present invention; 2B is a schematic diagram of the waveform of the circuit after stretching of the pixel brightness compensation structure of the first embodiment of the present invention; FIG. 3A is a partial schematic diagram of the stretchable display before stretching according to the first embodiment of the present invention; FIG. 3B is a partial schematic diagram of the stretchable display according to the first embodiment of the present invention after being stretched; 4A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the first embodiment of the present invention; 4B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the first embodiment of the present invention; 5A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the second embodiment of the present invention; 5B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the second embodiment of the present invention; 6A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the third embodiment of the present invention; 6B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the third embodiment of the present invention; 7A is a schematic cross-sectional view of the pixel brightness compensation structure before stretching according to the fourth embodiment of the present invention; 7B is a schematic cross-sectional view of the pixel brightness compensation structure after stretching according to the fourth embodiment of the present invention.

10: Stretchable display

11: Pixel brightness compensation structure

OLED: pixel unit

T1: The first transistor

T2: second transistor

T3: third transistor

T4: The fourth transistor

T5: fifth transistor

T6: sixth transistor

T7: seventh transistor

T8: Eighth Transistor

CSTR: Variable capacitance

CST: Capacitance

T1-1, T2-1, T3-1, T4-1, T5-1, T6-1, T7-1, T8-1, OLED-1, CSTR-1, CST-1: first electrode

T1-2, T2-2, T3-2, T4-2, T5-2, T6-2, T7-2, T8-2, OLED-2, CSTR-2, CST-2: second electrode

T1-G, T2-G, T3-G, T4-G, T5-G, T6-G, T7-G, T8-G: gate

Br: bridge structure

Is: island structure

OVDD, OVSS: operating voltage

EM[N]: Luminous signal

S1[N], S2[N], S1[N+1]: scan signal

VREF: Reference voltage

VDATA: data voltage

VG: Voltage

Claims (9)

A pixel brightness compensation structure of a stretchable display includes a pixel unit, a first transistor, and a variable capacitor. A first electrode of the first transistor is electrically connected to a first electrode of the variable capacitor. Electrode, a gate of the first transistor is electrically connected to a second electrode of the variable capacitor, and a second electrode of the first transistor is electrically connected to the pixel unit, wherein the variable capacitor is disposed on a Stretching the substrate, when the stretchable substrate is stretched, the first electrode and the second electrode of the variable capacitor are close to each other, so that the capacitance value of the variable capacitor is increased. The pixel brightness compensation structure of a stretchable display according to claim 1, wherein the second electrode of the variable capacitor has a first end and a second end, and the first end is adjacent to the pixel unit and far away For the first electrode, the second end is adjacent to the first electrode and away from the pixel unit. When the stretchable substrate is stretched, the first end of the second electrode approaches the first electrode. The pixel brightness compensation structure of a stretchable display according to claim 1, wherein the stretchable substrate includes a first substrate and a second substrate, and the first electrode of the variable capacitor is disposed on the A first substrate, the second electrode of the variable capacitor is disposed on the second substrate, and when the stretchable substrate is stretched, the first substrate and the second substrate are along a first direction Displacement relative to each other, and the first electrode and the second electrode of the variable capacitor are close to each other in the first direction. The pixel brightness compensation structure of a stretchable display according to claim 3, wherein the first direction is parallel to the direction in which the stretchable substrate is stretched. The pixel brightness compensation structure of a stretchable display according to claim 3, wherein the first direction is perpendicular to the direction in which the stretchable substrate is stretched. A pixel brightness compensation structure of a stretchable display includes a pixel unit, a first transistor, and a variable capacitor. A first electrode of the first transistor is electrically connected to the variable capacitor. A first electrode of the capacitor, a gate electrode of the first transistor is electrically connected to a second electrode of the variable capacitor, a second electrode of the first transistor is electrically connected to the pixel unit, wherein the variable The capacitor is disposed on a stretchable substrate. When the stretchable substrate is stretched, the first electrode or the second electrode of the variable capacitor is stretched along the direction in which the stretchable substrate is stretched. Stretching increases the capacitance value of the variable capacitor. According to the pixel brightness compensation structure of a stretchable display according to claim 6, when the stretchable substrate is stretched, the width of the first electrode or the second electrode of the variable capacitor increases, so that the stretchable The capacitance value of the variable capacitor increases. A stretchable display is provided with a stretchable substrate. The stretchable substrate includes an island structure and a bridge structure. The island structure is provided with a pixel unit and a first transistor. The bridge structure is provided with a variable A capacitor, a first electrode of the first transistor is electrically connected to a first electrode of the variable capacitor, a gate of the first transistor is electrically connected to a second electrode of the variable capacitor, and the first transistor A second electrode of the variable capacitor is electrically connected to the pixel unit, wherein when the stretchable substrate is stretched, the first electrode and the second electrode of the variable capacitor are close to each other, so that the capacitor of the variable capacitor The value increases. A stretchable display is provided with a stretchable substrate. The stretchable substrate includes an island structure and a bridge structure. The island structure is provided with a pixel unit and a first transistor. The bridge structure is provided with a variable A capacitor, a first electrode of the first transistor is electrically connected to a first electrode of the variable capacitor, a gate of the first transistor is electrically connected to a second electrode of the variable capacitor, and the first transistor When the stretchable substrate is stretched, the first electrode or the second electrode of the variable capacitor is stretched along the direction in which the bridge structure is stretched. Extend, increase the capacitance value of the variable capacitor.

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