TW574578B - Electrode array structure of IPS-LCD - Google Patents

Description

574578

This patent application is a continuation of application number 90 丨 〇622 1. Description of the invention: ^ The present invention relates to a lateral electric field wide viewing angle liquid crystal display (In-Plane Switching mode LCD, referred to as IPS-LCD), and particularly relates to an electrode arrangement structure of a lateral electric field wide viewing angle liquid crystal display and a manufacturing method thereof. The mainstream wide-view nematic) wide-viewing-angle lateral electric field liquid crystal display (IPS-LCD) is one of the corner LCD technologies' and is different from the general twisted nematic (twisted LCD) in that ipS — LCD's common electrode (c0mm. n

(electrode) and pi xel electrode are fabricated on the same side of the glass substrate (TFT substrate). It uses a transverse electric field to drive the common electrode and the pixel electrode, which can cause the liquid crystal molecules to rotate on the plane and thus greatly increase. Viewing angle, so it has the advantages of wide viewing angle, high light efficiency, high contrast and so on. However, as shown in Figure L, when the liquid crystal molecule 1 rotates toward the lateral electric field, when the angle between the M and the common electrode 2 or the day electrode 3 is 4 50 or 135 °, In some oblique viewing areas, there will be blue or yellow light coloring when viewing 1? 3-1 ^ 1), which will make ips — LCD's

Display quality is greatly reduced. In view of this, the conventional technology has developed an electrode structure in the form of a herringbone, which can adjust the rotation angle of liquid crystal molecules. As shown in FIG. 2, a conventional thin film transistor (TFT) substrate 10 of an IPS-LCD includes a pixel region 2 4 ′ of a plurality of arrays, which are data lines 1 extending from a plurality of Y directions. 2 and a plurality of gate lines 14 extending in the X direction are defined, wherein each pixel region 24 includes at least one TFT element 16 disposed at the intersection of the data line 12 and the gate line 14,

574578 V. Description of the invention (2) A comb-shaped pixel electrode 18 and a herring-shaped common electrode 20. As for the comb-type day element electrode 18, its bar 1 8a is disposed above the gate line 14 to form a capacitor, and a plurality of comb teeth 18b and 18c are continuous (like) Che vron), and extends from the crossbar 1 8a in the Y direction. As for the herring-shaped common electrode 20, a plurality of fish bones 20b and 20c extending from both sides of the central spine line 20a in the Y direction are <

The shape is not only staggered with the comb teeth 18b, 18c of the pixel electrode 18, but also the <shape of the fish bones 20b, 20c and the <shape of the comb teeth i8b, 18c are arranged in parallel. In addition, the surface of the TFT substrate 10 is covered with an orientation layer. The rubbing direction is shown by arrow A. Therefore, when no voltage is applied, the liquid crystal molecules 22 will be aligned along the direction of arrow A. .

When a voltage is applied to the TFT substrate 10, a lateral electric field is generated between the fish bones 20a, 20b of the common electrode 20 and the comb teeth igb, 18c of the day electrode 18, causing the liquid crystal molecules 22 to rotate in the direction of the electric field. With the central spine line 20a of the common electrode 20 as a distinction, the day-horizon region 24 can be divided into a plurality of first day-horizon regions 241 and second sky-horizon regions 242, and the liquid crystals located on both sides of the central spine line 20a The molecules 22a, 22b will rotate in opposite directions. For the first daytime prime region 241, since the fish bones 20b, 20c and the comb teeth 18b, 18c are all <-shaped, the liquid crystal molecules 22 &amp;, 22a 'located on both sides of the tip of the <-shaped will also show Turn in opposite directions to form a double block (^ 〇d⑽ains). The same situation also occurs in the liquid crystal molecules 22b and 22b of the second daytime element region 242. Since the fish bones 20b and 20c of the common electrode 20 and the comb teeth 18b and 18c of the pixel electrode 18 are both <-shaped, the transverse electric field generated will also exhibit a certain angle of inclination, thereby affecting the liquid crystal molecules 22 Rotation angle. Such as

0611-6121TWAF. A00152 I Cherry.ptd Page 5 574578 V. Explanation of the invention (3) In this way, by proper design, the rotation angle of the liquid crystal molecules 22 can be controlled, so that the liquid crystal molecules 22 can be used on the common electrode. 20. The rotation angle 0 between the day element electrodes 18 is controlled at 0. ~ + 6 0. Or 0. ~ A 6 0. To avoid blue or yellow light. However, the liquid crystal molecules 2 2 located at the tip of the shape (ie, the boundary of the double block) will be squeezed by the liquid crystal molecules 22 with different rotation directions on both sides, thereby causing a situation where they cannot rotate. Therefore, after the voltage is applied, the common electrode 20 and the pixel electrode 18 are not transparent, and the liquid crystal molecules 22 located at the boundary of the double block cannot rotate. Then, along the dotted line II, I at the tip of the shape, I-I I will be displayed as a dark line, which reduces the aperture ratio of the IPS-LCD. Especially when the shape of the fish bones 20b, 20c of the common electrode 20 or the comb teeth 18b, 18c of the pixel electrode 18 is designed to be jagged, the tip of the shape will increase, and the aperture ratio of the IPS-LCD will change It is even smaller. The present invention proposes an IPS-LCD electrode arrangement structure and a method for manufacturing the same, which 'can adjust the rotation angle of the liquid crystal molecules between the common electrode and the day electrode' and provides a space between the common electrode and the pixel electrode. The uneven electric field, with the display quality of Ruibao I PS-LCD, can also achieve the purpose of increasing the aperture ratio of I-LCD and reducing the driving voltage of IPS-LCD. [Brief description of the drawings] Figure 1 is a schematic cross-sectional view showing the rotation angle of liquid crystal molecules and the coloring phenomenon of blue light or yellow light. 'Figure 2 is a top view showing the electrode arrangement structure of the conventional PS_LCD. FIG. 3A shows the electrode arrangement of the IPS_LCD according to the first embodiment of the present invention.

574578 Description of the invention (4) Top view of the structure The figure shows a top view of the electrode arrangement structure of the IPS-LCD according to the second embodiment of the present invention. [Explanation of symbols] Daytime element area ~ 2 6; Subdaytime element area ~ 261, 262, 263, 264; Common electrode ~ 28; Common electrode bar ~ 28a;

Comb teeth of common electrode ~ 28b, 28c, 28d; pixel electrode ~ 3 Ο; bar of pixel electrode ~ 30a; comb teeth of pixel electrode ~ 30b, 30c; liquid crystal molecules ~ 32. Description of Embodiments: Please refer to FIG. 3A, which shows a top view of the electrode arrangement structure of the ips-LCD according to the first embodiment of the present invention. In the electrode arrangement structure of the I PS-LCD of the present invention, a comb-like common electrode 28 and a comb-like pixel electrode 30 are provided in each day element area 26, wherein the comb-like common electrode 28 is composed of a horizontal bar 28a and three Comb teeth 28b, 28c, 28d, and the comb-shaped pixel electrode 30 is composed of a horizontal bar 30a and two comb teeth 30b, 30c, and the two comb teeth 30b, 30c of the day electrode 30 The three comb teeth 2 8 b, 2 8 c, and 2 8 d of the common electrode 28 are interleaved, so that one pixel area 26 is divided into four sub-pixel areas 261, 262, 263, and 264. When no voltage is applied, the liquid crystal molecules 3 2 are aligned along the direction of arrow A, so the liquid crystal molecules 3 2

574578 5. The long axis of invention description (5) will be parallel to the comb teeth 28b, 28c, 28d of the common electrode 28. When a voltage is applied, a lateral electric field is generated between the comb teeth 28b, 28c, and 28d of the common electrode 28 and the comb teeth 30b, 30bc of the pixel electrode 30, causing the liquid crystal molecules 32 to rotate in the direction of the electric field. The first feature of the present invention is that the comb teeth 28b, 28c, 28d of the common electrode 28 are formed by a plurality of positive trapezoids connected to form a continuous 厶 -shaped side wall profile, and the comb teeth 30b, 30c of the pixel electrode 30 It is composed of a plurality of inverted trapezoids connected to form a continuous inverted cymbal profile. . Because the contours of the comb teeth 28b, 28c, and 28d are continuous, and the contours of the comb teeth 30b, 30c are continuous, the transverse electric field generated will also be inclined at a certain angle, thereby affecting the liquid crystal molecules 3. 2 rotation angle. In this way, by properly designing the shape, the rotation angle f of the liquid crystal molecules 32 can be controlled so that the rotation angle 0 of the liquid crystal molecules 32 between the common electrode 28 and the pixel electrode 30 is controlled from 0 to +60. Or 0. ~ A 60. To avoid blue or yellow = coloring. 'The second feature of the present invention is that the trapezoidal number of the teeth 28b, 28c, 28d of the common electrode 28 is not equal to the ladder envy of the comb teeth 30b, 30c of the day element electrode 30. For example, one inverted trapezoid of the comb teeth of the day electrode 30 will be adjacent to the two positive trapezoids of the comb teeth of the electrode 28, or even more than three. The pitch of k28's comb teeth changes irregularly, which in turn produces an uneven electric field. In the area above the second book 262, when the voltage is applied, the electric field near the tip of the sloping contour of the comb teeth 28c of Qiu Yongdian (the ancient comb teeth ... the smallest distance from the comb), and

574578 V. Description of the invention (6)-The electric field intensity of the parallel side wall region of 30b is the lowest (here, the distance between the comb teeth 28c and the comb teeth 30b is the largest), so the distance between the comb teeth 28c and the comb teeth 30b The electric field strength is not uniform. This electric field strength is not equal to the space differential (called the gradient). The applied voltage of ° s gradually increases to a certain value (which will be less than the general driving voltage value). It will start to rotate first ', and the liquid crystal molecules 32b and 32c located at a relatively small electric field intensity are stationary. Subsequently, when the rotation angle of the liquid crystal molecules 32a increases with time, 'e 1 astic distorted energy generated by the liquid crystal molecules 3 2 a will be transmitted upward or downward to the liquid crystal molecules 32 b, 3 2 The position of c is combined with the low electric field strength here to achieve the effect of rotating the liquid crystal molecules 3 2 b and 3 2 c. In the fifth embodiment of the present invention, the rotation angle range of the liquid crystal molecules 3 2 is: 0. &lt; 0 &lt; 2 〇◦. It can be known from the above that the design of such an uneven electric field can reduce the effective initial zero voltage value of the liquid crystal molecules 32b, 32c, and also reduce the driving voltage value of the IPS-LCD, thereby shortening the turn-on time (sw i t c h i n g t i m e). Please refer to FIG. 3B, which shows a top view of the electrode arrangement structure of the IPs-LCd according to the second embodiment of the present invention. The second embodiment of the present invention further improves the design of the first embodiment. The comb teeth of the common electrode 28 are composed of inverted trapezoids, and the comb teeth of the pixel electrode 30 are composed of positive trapezoids. The trapezoidal number of the comb teeth 28b, 28c, and 28d is not equal to the trapezoidal number of the comb teeth 30b, 30c of the pixel electrode 30, so that the interval between the comb teeth of the day electrode 30 and the comb teeth of the common electrode 28 varies irregularly. In turn, a non-uniform electric field is generated. Although the present invention has been disclosed above with a preferred embodiment, it is not

0611-6121TWAF; A00152; Cherry.ptd

574578

0611-6121TWAF; A00152; Cherry.ptd page 10

Claims (1)

574578 Su ~ Li \ WJh. Private 7, t Wei [No. 91100877 main ^ M range '丨: ㈣ 赛 年 力 1 · One of In-PlanBSllisiii ^ J mode LCD, referred to as IPS-LCD The electrode arrangement structure in the pixel area includes a comb-shaped common electrode, including a bar and a plurality of comb-teeth, wherein each comb tooth is The horizontal bar extends along the first longitudinal direction, and the contours of the two side walls of each comb tooth are continuous 厶 -shaped; and a comb-shaped pixel electrode includes a horizontal bar and a plurality of rectangular bar-shaped comb teeth, each of which The tooth system extends from the horizontal bar in the second longitudinal direction, and the plurality of comb teeth of the pixel electrode are interposed between the plurality of comb teeth of the common electrode, and the two side wall profiles of each comb tooth are continuous. In f; an electrical gradient is generated between the comb teeth of the common electrode and the comb teeth of the pixel electrode, so that an uneven electric field is formed between the comb teeth of the common electrode and the comb teeth of the day electrode; Each pole-comb system is connected by a plurality of trapezoids. Each comb tooth of the electrode is connected by a plurality of trapezoids to form the electrode arrangement structure described in item 1 of the first range of the electrode application, in which: the comb-comb tooth system and the common electrode Per-comb two two-phase 3 · As the patent application Fan Yuandi 1 g &amp; Lei Xi Xi for cough mounds &gt; 电极 electrode arrangement according to item 1 'wherein each of the pixel electrodes: f trapezoidal The connection is constituted by &amp; ω is constituted by the connection of the last several inverted trapezoids + 4. The connection as described in item 3 of the scope of patent application. Each common electrode of the common electrode | τ ^ ^ electrode arrangement structure, wherein 0611-6121TWFA1, A00152; Cherry.ptc Page 11 2003.07. 24.012 The positive ladder of the female ^ is not equal to the 574578 i of the pixel electrode No. 9]〗 〖77 77 Λ_Μ VI. Number of trapezoids. 5. As described in item 4 of the scope of the patent application, the range of the angle of rotation between the comb teeth of the pole and the pixel electrode is: 〇〇 &lt; 〇 &lt; 2q. . 6. As described in item 1 of the scope of the patent application, electricity Xi Quanyin # decay evening, the tooth system is composed of a plurality of inverted ladders 7 and the tooth system is composed of a plurality of forward ladders. The electric power described in item 6 of the patent scope should be shared Each electrode of the electrode is removed—only corpse / T 4 ^ 1: ^ number of inverted trapezoids of k teeth I Number of inverted trapezoids of each comb tooth. 8. If the 7th scope of the patent application is located at the common electrode rt ^ ^ ^ 浐 浐 々々 m ^ and the angle of rotation of the child electrode of the day element electrode, the circumference is: 0. &lt; Θ &lt; 20. . 9 If the scope of the patent application is located on the common electrode, the rotation angle range of I n rn xl ^ is: 0. ~ — 京 之 υ + 60〇 or Bu-6〇0 The modified pole arrangement knot comb teeth between the pole arrangement knot connected shape connected pole arrangement knot is equal to the picture pole arrangement knot comb teeth between the pole arrangement knot comb teeth Between. Structure, in which the liquid crystal structure, which constitutes and constitutes. Structure, where the structure of the prime electrode, where the liquid crystal structure, where the liquid crystal structure Eight V ship θ 574578 Schematic revision page No. 91100877 -——- „I revision date: 92Γϋ7. 24 ^^ — ^ 10 • A Xiaoya X \ 1