Alignment film, preparation method and liquid crystal display panel
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorSong Lan
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Abstract
The invention relates to the field of liquid crystal technology, and more particularly to an alignment film being applied in a PSVA liquid crystal display panel and including a first branched chain M and a second branched chain Q bonded on polyimide as a main chain and thus having a structure as shown in the following formula: The first branched chain M is a group applied to deflect the liquid crystal in a distribution state; the second branched chain Q is a group containing nitrobenzophenone or benzoquinonyl. The invention also provides a liquid crystal display panel using the alignment film. The invention can effectively suppress the broken bright point issue of panel and thereby improve panel quality.
Claims10
An alignment film applied in a liquid crystal display panel, wherein a structure of the alignment film containing a first branched chain M and a second branched chain Q bonded on a main chain of polyimide is as shown in formula 1 that:
- wherein the first branched chain M is a group applied to deflect liquid crystal molecules under a power distribution state;
- the second branched chain Q is a group containing a nitrobenzophenone or a benzoquinonyl;
- the x and y represent degrees of polymerization of the first branched chain M and the second branched chain Q respectively;
- the structural unit A represents:
- a cycloalky or an aryl with a number of carbon atom no more than 12, wherein one or more H atoms of the cycloalkyl or the aryl may be substituted by a halogen atom, an alkoxy group or an ester group.
A liquid crystal display panel, comprising two oppositely disposed substrates and a liquid crystal containing a reactive mesogen disposed between the two substrates, a side of each of the substrates adjacent to the liquid crystal being disposed with an alignment film;
- wherein a structure of the alignment film containing a first branched chain M and a second branched chain Q bonded on a main chain of polyimide is shown in formula 1:
- where the first branched chain M is a group applied to deflect the liquid crystal molecules under a power distribution state;
- the second branched chain Q is a group containing a nitrobenzophenone or a benzoquinonyl;
- the x and y represent degrees of polymerization of the first branched chain M and the second branched chain Q respectively;
- the structural unit A represents:
- a cycloaky or an aryl with a number of carbon atom no more than 12;
- wherein one or more H atoms of the cycloalkyl or the aryl may be substituted by a halogen atoms, an alkoxy groups or an ester group.
A preparation method of an alignment film applied in a liquid crystal display panel, comprising following steps:
- I. adding a dianhydride monomer p, a diamine monomer n containing a first branched chain and a diamine monomer m containing a second branched chain into an organic solvent and stirring for more than 24 h to obtain a precursor of alignment film;
- wherein a mole ratio of n:m=1:0.1˜1, and number of moles of p≥n+m;
- II. coating the precursor of alignment film on a substrate, toasting the coated substrate at 180˜230° C. for more than 30 minutes to dehydrate and polymerize the precursor to form an alignment film containing a first branched chain M and a second branched chain Q bonded on a main chain of a polyimide as shown in formula 1:
- where the first branched chain M is a group applied to deflect the liquid crystal molecules under a power distribution state;
- the second branched chain Q is a group containing a nitrobenzophenone or a benzoquinonyl;
- the x and y represent degrees of polymerization of the first branched chain M and the second branched chain Q respectively;
- the structural unit A represents:
- a cycloalkyl or an aryl with a number of carbon atom no more than 12, wherein on or more H atoms of the cycloalkyl or the aryl may be substituted by a halogen atom, an alkoxy group or an ester group.
Dependencies are inferred from the claim text.