CN101144954B - Liquid crystal display panel and liquid crystal display - Google Patents

Abstract

The present invention discloses a liquid crystal display panel and a liquid crystal display, the LCD panel comprises a plurality of pixel units, a first common voltage region and a second common voltage region. A plurality of pixel units comprise a first group of pixel units and a second group of pixel units, and the pixel units are in array-like arrangement. The first common voltage region is carried with a first AC voltage, and connected with the first group of pixel units by electricity. The second common voltage region is carried with a second AC voltage, and connected with the second group of pixel units by electricity.

Description

Liquid crystal display panel and liquid crystal display

technical field

The invention relates to a liquid crystal display panel, and in particular to a liquid crystal display panel with two common voltages.

Background technique

A traditional liquid crystal display panel is composed of an array of pixel units. Please refer to FIG. 1 , which is a top view of a conventional liquid crystal display panel. A conventional liquid crystal display panel includes a plurality of gate lines 102 and signal lines 104 arranged crosswise to define a plurality of pixel units 106 . The conventional liquid crystal display panel further includes a common voltage region 108 for providing a DC voltage or an AC voltage to each pixel unit. The pixel units of the traditional liquid crystal display panel have different inversion modes, such as row inversion, column inversion and dot inversion. When the common voltage is a DC voltage, the source driver needs to use a high-voltage process to meet the amplitude generated when the signal voltage is loaded on the common voltage. For example, please refer to FIG. 1A , which shows a schematic diagram of a signal with a common voltage as a DC voltage level. When the common voltage Vcom is 5V, the data signal Data needs to oscillate around 5V. Therefore, the source driver must have a driving capability of at least 10V. This high-voltage process will increase the price of the chip, and cause temperature rise and power consumption when the source driver is activated.

Furthermore, if the common voltage is an AC voltage, the inversion effect can be achieved with a smaller voltage amplitude in the column inversion inversion mode. Please refer to FIG. 1B , which shows a schematic diagram of signals with a common voltage as an AC voltage level. As shown in FIG. 1B , taking the X-th pixel unit row as an example, in the N-th frame, the common voltage and the polarity of the signal are just reversed, so only the amplitude range of 5V is required to achieve inversion. For example, when the common voltage is 0V in the N+1th frame, the data signal voltage can be 5V, and the actual voltage across the pixel capacitor is 5V. When the common voltage is 5V in the Nth frame, if the required cross voltage of the pixel capacitor is -5V, the data signal voltage only needs to be 0V. It can be seen that the use of AC voltage can make the panel that originally needs a voltage level range of 10V to achieve inversion, but now only needs a voltage level of 5V to invert.

However, using only one common voltage region can only provide the same AC voltage for all pixel units at the same time, so it is only suitable for the inversion mode of column inversion, but if you want to use the inversion mode of row inversion or dot inversion Unable to narrow the driving voltage level range. Please refer to FIG. 1C , row inversion or dot inversion is to input two kinds of opposite polarity signals into the signal line interleavedly, therefore, the driving voltage level range of the Xth pixel unit row can be narrowed by an AC voltage (for example 5V), but the polarity of the signal of the adjacent X+1th pixel unit row is opposite to that of the Xth pixel unit row, that is, the common voltage not only fails to reduce the voltage level range, but increases the driving voltage level range (For example, a voltage level range of 15V generated from 10V to -5V), causing the opposite effect.

Therefore, it is currently impossible to perform inversion in a row inversion or dot inversion mode while reducing the range of driving voltage levels with a single common voltage region.

Contents of the invention

The technical problem to be solved by the present invention is to provide a liquid crystal display panel and a liquid crystal display that can perform inversion under the inversion mode of row inversion or dot inversion without increasing the output voltage level range of the source driver.

To achieve the above object, the liquid crystal display panel provided by the present invention includes a plurality of pixel units, a first common voltage region, and a second common voltage region. The plurality of pixel units includes a first group of pixel units and a second group of pixel units, and the pixel units are arranged in an array. The first common voltage region carries a first AC voltage and is electrically connected to the first group of pixel units. The second common voltage region carries a second AC voltage and is electrically connected to the second group of pixel units.

Moreover, in order to achieve the above object, the present invention provides a liquid crystal display, including: a liquid crystal display panel, including: a plurality of pixel units, including a first group of pixel units and a second group of pixel units, these pixel units are in an array arrangement; a first common voltage region carrying a first AC voltage electrically connected to the first group of pixel units; and a second common voltage region carrying a second AC voltage electrically connected to the second group of pixel units and a plurality of common voltage drivers for respectively providing the first AC voltage and the second AC voltage.

An embodiment of the present invention uses two common voltage regions to provide two common voltages with opposite polarities to the corresponding pixel units. Therefore, when two signals of opposite polarities are input to the first and second group of pixel units, the common voltage of the two opposite polarities can avoid the expansion of the driving voltage level range.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

FIG. 1 is a top view of a conventional liquid crystal display panel;

FIG. 1A shows a schematic diagram of a signal with a common voltage as a DC voltage level; FIG. 1B shows a schematic diagram of a signal with a common voltage as an AC voltage level;

FIG. 1C is a schematic diagram illustrating a driving voltage level of an X-th pixel unit row;

2A and 2B are top views illustrating an embodiment of the present invention; and

3A and 3B are schematic diagrams illustrating common voltages and signals of an embodiment of the present invention.

Among them, reference signs:

102: Gate line 104: Signal line

106: Pixel unit 108: Common voltage area

200: LCD panel 202: Pixel unit

202A: The first group of pixel units 202B: The second group of pixel units

203A: common electrode of the first capacitor 203B: common electrode of the second capacitor

204: The first common voltage area 204A: The first conductive material

206: Second Common Voltage Area 206A: Second Conductive Material

208a, 208b, 208c, 208d, 208e, 208f, 208g: adapter pads

Detailed ways

Please refer to FIG. 2A and FIG. 2B , which illustrate a top view of an embodiment of the present invention. The LCD panel 200 includes a plurality of pixel units 202 , a first common voltage region 204 and a second common voltage region 206 . In FIG. 2A , the pixel unit 202 includes a first group of pixel units 202A and a second group of pixel units 202B, and the pixel units 202 are arranged in an array. FIG. 2B shows that the first common voltage region 204 located on the upper layer of the pixel unit 202 carries the first AC voltage ( Vcom1 ) and is electrically connected to the first group of pixel units 202A. The second common voltage region 206 carries a second AC voltage ( Vcom2 ) and is electrically connected to the second group of pixel units 202B.

In this embodiment, the first group of pixel units 202A and the second group of pixel units 202B may be arranged alternately. That is to say, the pixel units around a pixel unit in the first group of pixel units 202A all belong to the second group of pixel units 202B. Therefore, the pixel units in the same group are not adjacent to each other. In more detail, one of the first capacitor common electrodes 203A of every two adjacent pixel units 202 can be electrically connected to the first conductive material, and the second capacitor common electrode 203B of the other pixel unit 202 can be connected to the second conductive material. The material is electrically connected. This grouping arrangement of pixel units is to correspond to the inversion mode of dot inversion.

The first common voltage region 204 can be electrically connected to the capacitive common electrode of the first group of pixel units 202A through the first conductive material 204A. The first common voltage region 204 may be conductive glass. The first conductive material 204A can be a metal wire. When the first conductive material 204A is loaded with Vcom1, the first common voltage region 204 is loaded with Vcom1, and the first group of pixel units 202A all use Vcom1 as their common voltage. Likewise, the second common voltage region 206 can be electrically connected to the capacitor common electrode of the second group of pixel units 202B through the second conductive material 206A. The second common voltage region 206 may be conductive glass. The second conductive material 206A can be a metal wire. When the second conductive material 206A is loaded with Vcom2, the second common voltage region 206 is loaded with Vcom2, and the second group of pixel units 202B all use Vcom2 as their common voltage. The first and second common voltage regions 204, 206 can be electrically connected to the corresponding first conductive material 204A and second conductive material 206A by using transfer pads 208a, 208b, 208c, 208d, 208e, 208f, 208g.

In addition, the first common voltage region 204 and the second common voltage region 206 can be respectively located on different metal layers of the liquid crystal display panel and electrically isolated from each other. The first common voltage regions 204 and the second common voltage regions 206 may be alternately arranged on the corresponding first group of pixel units 202A and the second group of pixel units 202B.

The arrangement and connection of the first common voltage region 204 and the second common voltage region 206 with the first group of pixel units 202A and the second group of pixel units 202B can also be set based on the row inversion or column inversion mode. For example, the first group of pixel units 202A may include all odd-numbered pixel units 202 , and the second group of pixel units 202B may include all even-numbered pixel units 202 . In other words, the first capacitor common electrode 203A in every two adjacent pixel unit rows (columns) is electrically connected to the first conductive material, and the second capacitor common electrode 203B in another row (column) is electrically connected to the second conductive material. sexual connection.

Please refer to FIG. 3A and FIG. 3B at the same time, which are schematic diagrams of common voltages and signals according to an embodiment of the present invention. Taking the Xth pixel unit row and the adjacent X+1th pixel unit row respectively corresponding to FIG. 3A and FIG. 3B as an example, in the Nth frame, Vcom1 can be a positive voltage (for example, 5V), and Vcom2 can be a Negative voltage (such as a voltage of 0V or less). It should be noted that, in other embodiments, Vcom1 and Vcom2 may also be the negative voltage and the positive voltage respectively, and the embodiments of the present invention are not limited thereto. The signals Data1 and Data2 with opposite polarities can be alternately transmitted to the signal lines connected to the transfer pads 208 a , 208 c , 208 e , 208 g , and 208 b , 208 d , 208 f in FIG. 2A . That is to say, Data1 can be transmitted to the first group of pixel units 202A, and Data2 can be transmitted to the second group of pixel units 202B. Referring to FIG. 3A, the polarities of Vcom1 and Data1 in the Xth pixel unit row in the Nth frame are opposite, so the voltage level range can be reduced (for example, when Data1 with an amplitude of 0 to -5V is loaded on Vcom1 of 5V, the actual Data1 is Amplitude between 0 ~ 5V). The polarities of Vcom2 and Data2 of the X+1th pixel unit row in the Nth frame are opposite, so the voltage level range can be maintained at an amplitude between 0V and 5V.

Referring to FIG. 3B , in the N+1th frame, the polarities of Vcom1 and Vcom2 are reversed, and the polarities of Data1 and Data2 are reversed, so the reverse can also be performed in a smaller range of voltage levels. It can be seen that when two AC voltages (Vcom1, Vcom2) with opposite polarities are used on the two common voltage regions (204, 206) and connected to the corresponding pixel units, the voltage level can be reduced at a smaller voltage level. Inversion within the range, avoiding the use of source drivers in the high voltage level range, in order to reduce the production cost and the temperature when the chip operates.

The liquid crystal display panel of the present invention can be matched and applied to a liquid crystal display. The liquid crystal display may include the above-mentioned liquid crystal display panel and a common voltage driver for respectively providing the first AC voltage and the second AC voltage.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (8)

1. a panel of LCD is characterized in that, comprising:

A plurality of pixel cells comprise the first sets of pixels unit and the second sets of pixels unit, and those pixel cells are arrayed, and have the electric capacity common electrode;

First common voltage region is loaded with first alternating voltage, is electrically connected at the electric capacity common electrode of this first sets of pixels unit by first conductive material; And

Second common voltage region is loaded with second alternating voltage, is electrically connected at the electric capacity common electrode of this second sets of pixels unit by second conductive material;

Per two an adjacent pixel cells pixel cell wherein is this first sets of pixels unit, and another pixel cell is this second sets of pixels unit;

This first common voltage region and this second common voltage region lay respectively at the different metal level of panel of LCD, this metal level electrical isolation; This first common voltage region and this second common voltage region are staggered on this first sets of pixels unit of correspondence and this second sets of pixels unit;

The polarity of this first alternating voltage and this second alternating voltage is opposite.

2. panel of LCD according to claim 1 is characterized in that, other comprises a switching pad, and this first and second common voltage region is electrically connected at first and second corresponding conductive material with this switching pad.

3. panel of LCD according to claim 1 is characterized in that, this first conductive material and second conductive material are staggered on those pixel cells that first common voltage region of correspondence and this second common voltage region are connected.

4. panel of LCD according to claim 1 is characterized in that, this first common voltage region and second common voltage region system respectively are an electro-conductive glass.

5. a LCD is characterized in that, comprising:

One panel of LCD comprises:

A plurality of pixel cells comprise one first sets of pixels unit and one second sets of pixels unit, and those pixel cells are arrayed, and have the electric capacity common electrode;

One first common voltage region is loaded with one first alternating voltage, is electrically connected at the electric capacity common electrode of this first sets of pixels unit by first conductive material; And

One second common voltage region is loaded with one second alternating voltage, is electrically connected at the electric capacity common electrode of this second sets of pixels unit by second conductive material; And

A plurality of common voltage drivers are in order to provide this first alternating voltage and this second alternating voltage respectively;

Per two an adjacent pixel cells pixel cell wherein is this first sets of pixels unit, and another pixel cell is this second sets of pixels unit;

This first common voltage region and this second common voltage region lay respectively at the different metal level of panel of LCD, this metal level electrical isolation; This first common voltage region and this second common voltage region are staggered on this first sets of pixels unit of correspondence and this second sets of pixels unit; The polarity of this first alternating voltage and this second alternating voltage is opposite.

6. LCD according to claim 5 is characterized in that, other comprises a switching pad, and this first and second common voltage region is electrically connected at this corresponding first and second conductive material with this switching pad.

7. LCD according to claim 5 is characterized in that, this first conductive material and this second conductive material are staggered on those pixel cells that this first common voltage region of correspondence and this second common voltage region are connected.

8. LCD according to claim 5 is characterized in that, this first common voltage region and second common voltage region are electro-conductive glass.

Images