CN100478766C - Pixel structure - Google Patents

Abstract

A transflective pixel structure includes an active device, a storage capacitor, a transparent electrode, and a first reflective electrode. The storage capacitor includes a lower electrode, a floating electrode, and an upper electrode. The upper electrode is configured above the lower electrode and the floating electrode and is electrically connected with the active device. The transparent electrode is electrically connected with the upper electrode. The first reflective electrode is electrically connected with the floating electrode and electrically insulated from the transparent electrode. Based on the above, the transflective pixel structure provided by the invention can improve the display quality of the single-unit-pitch transflective liquid crystal display panel.

Description

pixel structure

technical field

The present invention relates to a pixel structure, in particular to a semi-transmissive and semi-reflective pixel structure.

Background technique

The rapid progress of the multimedia society is mostly due to the rapid progress of semiconductor components or man-machine display devices. As far as displays are concerned, cathode ray tubes (cathode ray tubes, CRTs) have been monopolizing the display market in recent years because of their excellent display quality and economical efficiency. However, for the environment where individuals operate most terminals/display devices on the table, or from the perspective of environmental protection, if the trend of energy saving is predicted, cathode ray tubes still have many problems in terms of space utilization and energy consumption, and There is no effective solution to the demands of lightness, thinness, shortness, smallness and low power consumption. Therefore, thin film transistor liquid crystal displays (TFT-LCDs) with superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and low radiation have gradually become the mainstream of the market.

Generally, liquid crystal displays can be classified into three categories: transmissive, reflective, and transflective. The classification is based on the utilization of light sources and differences in array substrates (arrays). Among them, the transmissive liquid crystal display mainly uses the back light as the light source, and the pixel electrodes on the array substrate are transparent electrodes to facilitate the penetration of the back light; the reflective liquid crystal display mainly uses the front light or the front light. The external light source is used as the light source, and the pixel electrodes on the array substrate are metal or other reflective electrodes with good reflective properties, which are suitable for reflecting the front light source or external light source; while the semi-transmissive and semi-reflective LCD can use the backlight source at the same time And external light source for display, the pixels on it can be divided into transmissive area and reflective area, the transmissive area has a transparent electrode to facilitate backlight penetration, and the reflective area has a reflective electrode suitable for reflecting the external light source.

FIG. 1 shows a structure diagram of a conventional dual cell gap liquid crystal display unit. Please refer to FIG. 1, the liquid crystal display unit 100 has two regions, which are respectively the transmissive region T and the reflective region R, and includes a first substrate 110, a thin film transistor 120, a dielectric layer 130, a transparent electrode 140, and a reflective region. The electrode 150 , a liquid crystal layer 160 , a spacer 170 , a color filter film 180 and a second substrate 190 .

Wherein, the thin film transistor 120 is disposed on the first substrate 110; the dielectric layer 130 is disposed on the thin film transistor 120 and the first substrate 110; the transparent electrode 140 and the reflective electrode 150 are disposed on the dielectric layer 130, and respectively Located in the transmissive area T and the reflective area R; the color filter film 180 is disposed under the second substrate 190; the liquid crystal layer 160 is disposed between the transparent electrode 140, the reflective electrode 150 and the color filter film 180; the spacer 170 is It is disposed on the transparent electrode 140 or the reflective electrode 150 to maintain a constant cell pitch.

It should be noted that the cell pitch of the transmissive region T is approximately twice the cell pitch of the reflective region R. During the period when the light enters the liquid crystal display unit 100 in the reflective region R and is reflected from the liquid crystal display unit 100, the distance it travels through the liquid crystal layer 160 will be the same as the distance that the light travels through the liquid crystal layer 160 during the period when the light passes through the liquid crystal display unit 100 in the transmissive region T. Therefore, the transmittance of the reflective region R is almost the same as that of the transmissive region T.

FIG. 2 shows a simulated diagram of the transmittance of such a liquid crystal display unit with a double cell pitch. Referring to FIG. 2 , it can be seen from FIG. 2 that under different applied voltage conditions, the transmittances of the reflective region R and the transmissive region T are almost the same. In other words, the display quality of the double cell pitch transflective liquid crystal display panel is better. However, since the cell pitch of the transmissive region T is different from that of the reflective region R, the height difference at the junction of the transparent electrode 140 and the reflective electrode 150 will lead to inconsistent alignment of the liquid crystal in a local area or an uneven electric field, resulting in double The problem of light leakage in the cell pitch semi-transmissive semi-reflective liquid crystal display panel. In addition, the junction of the transparent electrode 140 and the reflective electrode 150 will reduce the aperture ratio of the transflective liquid crystal display panel with double cell spacing.

FIG. 3 shows a structure diagram of a conventional single cell gap liquid crystal display unit. Referring to FIG. 3 , the liquid crystal display unit 200 is similar to the liquid crystal display unit 100 except that in the liquid crystal display unit 200 , the cell pitch of the transmissive region T is the same as that of the reflective region R. Since there is no height difference between the transparent electrodes 240 and the reflective electrodes 250, although the single-unit-pitch transflective liquid crystal display panel does not have the problem of light leakage or reduced aperture ratio, under the same driving voltage, due to the reflective region R The transmittance of the transmissive area T is different from that of the transmissive region T, which will result in poor display quality of the single-cell-pitch transflective liquid crystal display panel.

FIG. 4 shows a simulation diagram of the transmittance of such a liquid crystal display unit with a single cell pitch. Please refer to FIG. 4 . It can be seen from FIG. 4 that under the same applied voltage condition, the transmittances of the reflective region R and the transmissive region T are quite different. It can be seen from FIG. 3 and FIG. 4 that the liquid crystal display unit of the single cell pitch type cannot fully take into account the transmittance of the reflective region R and the transmittance of the transmissive region T. Referring to FIG.

Contents of the invention

In view of this, the purpose of the present invention is to provide a transflective pixel structure which can improve the display quality.

Based on the above purpose or other purposes, the present invention proposes a transflective pixel structure, which includes an active device, a storage capacitor, a transparent electrode and a first reflective electrode. Wherein, the storage capacitor includes a lower electrode, a floating electrode and an upper electrode. The upper electrode is arranged above the lower electrode and the floating electrode, and is electrically connected with the active device. The transparent electrode is electrically connected with the upper electrode of the storage capacitor. The first reflective electrode is disposed above the storage capacitor and is electrically connected to the floating electrode of the storage capacitor. The first reflective electrode is located on the same plane as the transparent electrode and is electrically insulated from the transparent electrode. The distance between the upper electrode and the floating electrode is adjusted. The size of the overlapping area makes the transmittance of the reflective area similar to that of the transmissive area.

According to the transflective pixel structure described in the preferred embodiment of the present invention, the active device includes, for example, a thin film transistor.

According to the transflective pixel structure described in the preferred embodiment of the present invention, the transparent electrode and the first reflective electrode are located on the same planar layer, for example.

According to the transflective pixel structure described in the preferred embodiment of the present invention, the first reflective electrode is disposed above the storage capacitor, for example.

The transflective pixel structure according to the preferred embodiment of the present invention, for example, further includes a shared wiring disposed between the transparent electrode and the first reflective electrode.

According to the transflective pixel structure described in the preferred embodiment of the present invention, the lower electrode is electrically connected to the shared wiring.

According to the transflective pixel structure described in the preferred embodiment of the present invention, the upper electrode extends from below the first reflective electrode to above the shared wiring.

The transflective pixel structure according to the preferred embodiment of the present invention, for example, further includes a first dielectric layer, a second dielectric layer and a flat layer. The first dielectric layer is disposed under the transparent electrode and the first reflective electrode to cover the lower electrode and the floating electrode. The second dielectric layer is disposed on the first dielectric layer to cover the upper electrode. The planar layer is disposed on the second dielectric layer, wherein the first dielectric layer, the second dielectric layer and the planar layer have a first contact window, the transparent electrode and the first reflective electrode are located on the planar layer, and are transparent The electrode and the first reflective electrode are respectively electrically connected to the upper electrode and the floating electrode through the first contact window.

The transflective pixel structure according to the preferred embodiment of the present invention, for example, further includes a second reflective electrode electrically connected to the upper electrode.

The transflective pixel structure according to the preferred embodiment of the present invention, for example, further includes a first dielectric layer, a second dielectric layer and a flat layer. The first dielectric layer is disposed under the transparent electrode, the first reflective electrode and the second reflective electrode to cover the lower electrode and the floating electrode. The second dielectric layer is disposed on the first dielectric layer to cover the upper electrode. The flat layer is disposed on the second dielectric layer, wherein the first dielectric layer, the second dielectric layer and the flat layer have a first contact window and a second contact window, the transparent electrode, the first reflective electrode and the The second reflective electrode is located on the flat layer, and the transparent electrode and the first reflective electrode are respectively electrically connected to the upper electrode and the floating electrode through the first contact window, and the second reflective electrode is electrically connected to the upper electrode through the second contact window connect.

According to the transflective pixel structure described in the preferred embodiment of the present invention, the area ratio of the second reflective electrode to the first reflective electrode is, for example, between 0.05 and 0.4.

The semi-transmissive and semi-reflective pixel structure of the present invention adjusts the size of the overlapping area of the upper electrode and the floating electrode, so that the transmittance of the reflective area is similar to that of the transmissive area, so that the single-unit-pitch semi-transparent semi-reflective pixel structure can be improved. Display quality of reflective LCD panels.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1 shows a structural diagram of a liquid crystal display unit of a double-cell spacing type.

FIG. 2 shows a simulated diagram of the transmittance of a liquid crystal display unit with a double cell pitch.

FIG. 3 shows a structure diagram of a liquid crystal display unit of a single-cell pitch type.

FIG. 4 shows a simulated diagram of the transmittance of a liquid crystal display unit with a single cell pitch.

FIG. 5A shows a schematic structural diagram of the semi-transmissive and semi-reflective pixel structure according to the first embodiment of the present invention.

5B and 5C respectively show the cross-sectional views of the transflective and semi-reflective pixel structure in Fig. 5A along the section lines A-A' and B-B'.

FIG. 5D shows a cross-sectional view of the liquid crystal display unit formed by the transflective and semi-reflective pixel structure in FIG. 5A along the section line C-C'.

FIG. 5E shows an equivalent circuit diagram of a liquid crystal display unit composed of a semi-transmissive and semi-reflective pixel structure according to the first embodiment of the present invention.

FIG. 5F is a simulated diagram of the transmittance of the liquid crystal display unit composed of the semi-transmissive semi-reflective pixel structure according to the first embodiment of the present invention.

FIG. 6A shows a schematic structural diagram of a semi-transmissive and semi-reflective pixel structure according to a second embodiment of the present invention.

6B and 6C respectively show cross-sectional views of the transflective semi-reflective pixel structure in Fig. 6A along the section lines A-A' and B-B'.

FIG. 6D shows a cross-sectional view of the liquid crystal display unit formed by the transflective and semi-reflective pixel structure in FIG. 6A along the section line C-C'.

FIG. 6E shows an equivalent circuit diagram of a liquid crystal display unit formed by a semi-transmissive and semi-reflective pixel structure according to the second embodiment of the present invention.

FIG. 6F is a simulated diagram of the transmittance of the liquid crystal display unit composed of the semi-transmissive semi-reflective pixel structure according to the second embodiment of the present invention.

Description of reference symbols

100, 200, 400, 600: LCD display unit

110, 190, 210, 290: substrate

120, 220: thin film transistor

130, 230, 360, 370, 460, 470: dielectric layer

140, 240, 330, 430: transparent electrodes

150, 250, 340, 540a, 540b: reflective electrodes

160, 260, 410, 610: liquid crystal layer

170, 270: Spacers

180, 280, 430, 630: color filter film

300, 500: semi-transparent and semi-reflective pixel structure

310, 510: active devices

320, 520: storage capacitor

322, 522: lower electrode

324, 524: floating electrodes

326, 526: upper electrode

350, 550: shared wiring

380, 580: flat layer

390, 590a, 590b: contact windows

420, 620: shared electrodes

T: Transmissive area

R: reflective area

Detailed ways

first embodiment

Fig. 5A shows a schematic structural diagram of the transflective pixel structure of the first embodiment of the present invention, in which figure (a) is a top view of the transflective pixel structure, and figure (b) is the top view of figure (a). The top view of the next layer of structure, Figure (c) is the top view of the next layer of structure in Figure (b). In addition, FIGS. 5B and 5C respectively show cross-sectional views of the transflective and semi-reflective pixel structure in FIG. 5A along the section lines A-A' and B-B'. Please refer to FIGS. 5A to 5C at the same time. The semi-transmissive and semi-reflective pixel structure 300 of the first embodiment of the present invention is located on a first substrate 110, which has two regions, respectively a transmission region T and a reflection region R, and includes an active device 310, a storage The capacitor 320 , a transparent electrode 330 , and a first reflective electrode 340 . The storage capacitor 320 further includes a lower electrode 322 , a floating electrode 324 and an upper electrode 326 .

The active device 310 can serve as a switch for charging or discharging the transparent electrode 330 and the first reflective electrode 340 , and it includes, for example, a thin film transistor. The upper electrode 326 is disposed above the lower electrode 322 and the floating electrode 324 , and is electrically connected to the active device 310 , and its material is, for example, metal or other suitable conductive materials. The transparent electrode 330 is electrically connected to the upper electrode 326 , so the transparent electrode 330 can be electrically connected to the active device 310 via the upper electrode 326 , and its material is, for example, indium tin oxide or other light-transmitting conductive materials. The first reflective electrode 340 is disposed above the storage capacitor 320, is located on the same plane as the transparent electrode 330, and is electrically connected to the floating electrode 324 of the storage capacitor 320, but is electrically insulated from the transparent electrode 330, and its material is, for example, metal. Or other suitable reflective conductive material.

In addition, a shared wiring 350 is disposed between the transparent electrode 330 and the first reflective electrode 340 , and is electrically connected to the lower electrode 322 . The upper electrode 326 extends from below the first reflective electrode 340 to above the shared wiring 350 .

In general, a dielectric layer is usually disposed in a capacitor. In the transflective pixel structure 300 of this embodiment, a first dielectric layer 360 is disposed in the middle of the storage capacitor 320 . The first dielectric layer 360 is disposed under the transparent electrode 330 and the first reflective electrode 340 to cover the lower electrode 322 and the floating electrode 324 . A second dielectric layer 370 and a flat layer 380 are disposed in the capacitor formed by the first reflective electrode 340 and the upper electrode 326 . The second dielectric layer 370 is disposed on the first dielectric layer 360 to cover the upper electrode 326, and the flat layer 380 is disposed on the second dielectric layer 370 so that the first reflective electrode 340 and the transparent electrode 330 are located at the same flat. The first dielectric layer 360, the second dielectric layer 370, and the planar layer 380 have a first contact window 390, so that the transparent electrode 330 and the first reflective electrode 340 can communicate with the upper electrode 326 and the floating electrode through the first contact window 390, respectively. 324 are electrically connected.

Due to the configuration of the flat layer 380, the first reflective electrode 340 and the transparent electrode 330 are located on the same plane, so the transflective pixel structure 300 of this embodiment will not have the problem of inconsistent liquid crystal alignment or uneven electric field in a local area Therefore, the phenomenon of light leakage in the single-unit-pitch transflective liquid crystal display panel can be improved.

FIG. 5D shows a cross-sectional view of the liquid crystal display unit formed by the transflective and semi-reflective pixel structure in FIG. 5A along the section line C-C'. Referring to FIG. 5D , the liquid crystal display unit 400 includes a half-transmissive half-reflective pixel structure 300 , a liquid crystal layer 410 , a common electrode 420 , a color filter film 430 and a second substrate 190 . The liquid crystal layer 410 is disposed between the transflective pixel structure 300 and the shared electrode 420 , and the shared electrode 420 is disposed under the color filter film 430 , and the color filter film 430 is disposed under the second substrate 190 .

FIG. 5E shows an equivalent circuit diagram of a liquid crystal display unit composed of a semi-transmissive and semi-reflective pixel structure according to the first embodiment of the present invention. Please refer to FIG. 5D and FIG. 5E at the same time. The upper electrode 326 (or transparent electrode 330) and the lower electrode 322 in FIG. 5D respectively constitute the first electrode plate of the capacitor C _{st (T)} in FIG. 5E (C in FIG. _{st (T)} below the electrode plate), the second electrode plate (the electrode plate above C _{st (T)} in FIG. 5E); the transparent electrode 330 (or upper electrode 326) and the shared electrode 420 in FIG. The first electrode plate (the electrode plate below Clc _(T) in FIG. 5E ), the second electrode plate (the electrode plate above Clc _(T) in FIG. 5E ) of capacitor _Clc(T) in 5E; The upper electrode 326 and the first reflective electrode 340 (or floating electrode 324) in FIG. 5D respectively constitute the first electrode plate of the capacitor C _{st (R)} in FIG. 5E (the electrode below C _{st (R)} in FIG. 5E plate), the second electrode plate (the electrode plate above C _{st (R)} in FIG. 5E ); the first reflective electrode 340 (or floating electrode 324 ) in FIG. 5D , and the shared electrode 420 respectively constitute the capacitor in FIG. 5E The first electrode plate of Clc _(R) (the electrode plate below Clc _(R) in FIG. 5E ), the second electrode plate (the electrode plate above Clc _(R) in FIG. 5E ).

Please continue to refer to FIG. 5E, when the active device 310 is in the on state, an external voltage Va will be applied to the upper electrode 326, so that the first electrode plate of the capacitor C _{st (T)} (that is, the upper electrode 326 or the transparent electrode 330) The voltages of the first electrode plate (ie, the transparent electrode 330 ) of the capacitor Clc _(T) and the first electrode plate (ie, the upper electrode 326 ) of the capacitor C _{st (R)} are both Va. Since the capacitor C _st(R) is connected in series with the capacitor C _lc(R) , the voltage difference (Va-Vcom) needs to be distributed between the two capacitors C _st(R) and C _lc(R) . Thus, the voltage value Vf of the first electrode plate of the capacitor _Clc(R) (ie, the floating electrode 324 or the first reflective electrode 340 ) will be different from the applied voltage Va. If the size of the overlapping area of the upper electrode 326 and the floating electrode 324 is changed, the value of Cst _(R) can be adjusted, that is, the first electrode plate of the capacitor Clc _(R) (ie, the floating electrode 324 or the first reflective electrode 340) the voltage value Vf will also be adjusted accordingly. As mentioned above, the transmittance of the reflective region R can be made close to the transmittance of the transmissive region T by changing the voltage value Vf. FIG. 5F is a simulated diagram of the transmittance of the liquid crystal display unit composed of the semi-transmissive semi-reflective pixel structure according to the first embodiment of the present invention. Please refer to FIG. 5F . From FIG. 5F , it can be seen that the transmittance of the reflective region R is similar to that of the transmissive region T under the same applied voltage condition. Therefore, the display quality of the single-unit-pitch transflective liquid crystal display panel formed by the transflective pixel structure 300 of the present invention is better.

second embodiment

Fig. 6A shows a schematic structural diagram of the transflective pixel structure of the second embodiment of the present invention, in which figure (a) is a top view of the transflective pixel structure, and figure (b) is the top view of the transflective pixel structure in figure (a). The top view of the next layer of structure, Figure (c) is the top view of the next layer of structure in Figure (b). In addition, FIGS. 6B and 6C respectively show the cross-sectional views of the transflective and semi-reflective pixel structure in FIG. 6A along the section lines A-A' and B-B'. Please refer to FIGS. 6A to 6C at the same time. The transflective pixel structure 500 of this embodiment is similar to the transflective pixel structure 300 of the first embodiment, the difference is that: the transflective pixel structure 500 includes a second reflective electrode 540b, which It is electrically connected to the upper electrode 526 and electrically insulated from the first reflective electrode 540a, and the area ratio of the second reflective electrode 540b to the first reflective electrode 540a is, for example, between 0.05 and 0.4.

In the transflective pixel structure 500 of this embodiment, a first dielectric layer 560 is disposed in the middle of the storage capacitor 520, and the first dielectric layer 560 is disposed on the transparent electrode 530, the first reflective electrode 540a and the second Below the reflective electrode 540 b to cover the lower electrode 522 and the floating electrode 524 . A second dielectric layer 570 and a flat layer 580 are arranged in the middle of the capacitor formed by the first reflective electrode 540a, the second reflective electrode 540b and the upper electrode 526, and the second dielectric layer 570 is arranged on the first dielectric layer 560. To cover the upper electrode 526, the flat layer 580 is disposed on the second dielectric layer 570, so that the first reflective electrode 540a, the second reflective electrode 540b and the transparent electrode 530 are located on the same plane. The first dielectric layer 560, the second dielectric layer 570, and the flat layer 580 have a first contact window 590a and a second contact window 590b, so that the transparent electrode 530 and the first reflective electrode 540a pass through the first contact 590a respectively. It is electrically connected with the upper electrode 526 and the floating electrode 524 , and the second reflective electrode 540 b can be electrically connected with the upper electrode 526 through the second contact window 590 b.

FIG. 6D shows a cross-sectional view of the liquid crystal display unit formed by the transflective and semi-reflective pixel structure in FIG. 6A along the section line CC'. Please refer to FIG. 6D , the liquid crystal display unit 600 is similar to the liquid crystal display unit 400 described in the first embodiment. FIG. 6E shows an equivalent circuit diagram of a liquid crystal display unit formed by a semi-transmissive and semi-reflective pixel structure according to the second embodiment of the present invention. Please refer to FIG. 6D and FIG. 6E at the same time. The upper electrode 526 (or transparent electrode 530) and the lower electrode 522 in FIG. 6D respectively constitute the first electrode plate and the second electrode plate of the capacitor C _st(T) in FIG. 6E; The transparent electrode 530 (or upper electrode 526) and the shared electrode 620 in Fig. 6D constitute the first electrode plate and the second electrode plate of the capacitor _{Clc (T)} in Fig. 6E respectively; The reflective electrode 540a (or floating electrode 524) constitutes the first electrode plate and the second electrode plate of the capacitor Cst _(R) in FIG. 5E respectively; the first reflective electrode 540a (or floating electrode 524) and The shared electrode 620 respectively constitutes the first electrode plate and the second electrode plate of the capacitor _Clc(R) in FIG. 6E; the lower electrode 522 and the second reflective electrode 540b (or upper electrode 526) in FIG. 6D respectively constitute the The first electrode plate and the second electrode plate of the capacitor C' _st(R) .

Same as the first embodiment, if the size of the overlapping area of the upper electrode 526 and the floating electrode 524 is changed, the value of Cst _(R) can be adjusted, and the first electrode plate of the capacitor Clc _(R) (ie, the floating electrode) 524 or the voltage value Vf of the first reflective electrode 540a) will also be adjusted accordingly. By changing the voltage value Vf, the transmittance of the reflective region R can be made close to the transmittance of the transmissive region T. In addition, due to the configuration of the second reflective electrode 540b, the transmittance of the reflective region R can be made closer to the transmittance of the transmissive region T. FIG. 6F is a simulated diagram of the transmittance of the liquid crystal display unit composed of the semi-transmissive semi-reflective pixel structure according to the second embodiment of the present invention. Please refer to FIG. 6F . It can be seen from FIG. 6F that under the same applied voltage condition, the transmittance of the reflective region R is closer to that of the transparent region T. Therefore, the display quality of the single-unit-pitch transflective liquid crystal display panel made with the transflective pixels of the second embodiment of the present invention is better.

In summary, the semi-transmissive and semi-reflective pixel structure of the present invention has at least the following advantages:

1. The first reflective electrode, the second reflective electrode and the transparent electrode of the semi-transparent semi-reflective pixel junction of the present invention are located on the same plane, so there will be no problem of inconsistent liquid crystal alignment or uneven electric field in a local area, which can improve the single-unit The phenomenon of light leakage occurs in the pitch-type transflective liquid crystal display panel.

2. The semi-transmissive and semi-reflective pixel structure of the present invention can improve the single-unit-pitch semi-transmissive pixel structure by adjusting the overlapping area of the upper electrode and the floating electrode so that the transmittance of the reflective area is similar to that of the transmissive area. The display quality of a semi-reflective LCD panel.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection is subject to the scope of protection of the claims of the present invention.

Claims (9)

1. transflective pixel structure comprises:

Active device;

Reservior capacitor includes bottom electrode; Floating electrode; And top electrode, be disposed at this bottom electrode and this floating electrode top, and electrically connect with this active device;

Transparency electrode is with the top electrode electric connection of this reservior capacitor; And

First reflecting electrode is disposed at this reservior capacitor top and electrically connects with the floating electrode of this reservior capacitor, and wherein this first reflecting electrode and this transparency electrode are positioned at same plane and are electrically insulated with this transparency electrode,

Wherein, adjust the size of the overlapping area of top electrode and floating electrode, make the transmissivity of the transmissivity of echo area and transmission area close.

2. transflective pixel structure as claimed in claim 1, wherein this active device comprises thin film transistor (TFT).

3. transflective pixel structure as claimed in claim 1 also comprises shared wiring, is disposed between this transparency electrode and this first reflecting electrode.

4. transflective pixel structure as claimed in claim 3, wherein this bottom electrode and this shared wiring electrically connect.

5. transflective pixel structure as claimed in claim 3, wherein this top electrode extends to this shared wiring top by this first reflecting electrode below.

6. transflective pixel structure as claimed in claim 1 also comprises:

First dielectric layer is disposed at this transparency electrode and this first reflecting electrode below, to cover this bottom electrode and this floating electrode;

Second dielectric layer is disposed on this first dielectric layer, to cover this top electrode; And

Flatness layer, be disposed on this second dielectric layer, wherein this first dielectric layer, this second dielectric layer and this flatness layer have first contact hole, this transparency electrode and this first reflecting electrode are positioned on this flatness layer, and this transparency electrode and this first reflecting electrode electrically connect with this top electrode and this floating electrode respectively by this first contact hole.

7. transflective pixel structure as claimed in claim 1 also comprises second reflecting electrode, is positioned at same plane with the top electrode electric connection of this reservior capacitor and with this first reflecting electrode.

8. transflective pixel structure as claimed in claim 7 also comprises:

First dielectric layer is disposed at this transparency electrode, this first reflecting electrode and this second reflecting electrode below, to cover this bottom electrode and this floating electrode;

Second dielectric layer is disposed on this first dielectric layer, to cover this top electrode; And

Flatness layer, be disposed on this second dielectric layer, wherein this first dielectric layer and this flatness layer, this second dielectric layer and this flatness layer have first contact hole and second contact hole respectively, this transparency electrode, this first reflecting electrode and this second reflecting electrode are positioned on this flatness layer, and this transparency electrode and this first reflecting electrode electrically connect with this top electrode and this floating electrode respectively by this first contact hole, and this second reflecting electrode electrically connects by this second contact hole and this top electrode.

9. transflective pixel structure as claimed in claim 7, wherein the area ratio of this second reflecting electrode and this first reflecting electrode is between 0.05 to 0.4.

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