Display Panel Shift Register Load Compensation for Uniform Brightness

Solution Overview

Problem

Display panels with narrow bezels experience over-brightness issues in pixel rows due to unequal load distribution among shift registers, leading to poor display uniformity.

Innovation Solution

Implementing load compensation units connected to shift registers in the bezel region to balance the load distribution, ensuring consistent brightness across pixel rows.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the same shift register is used to drive multiple pixel rows to reduce the number of shift registers, then the bezel width is reduced, but the brightness uniformity deteriorates

Engineering Contradiction:

Improvebezel widthVSAvoidbrightness uniformity

Core Design Contradiction:

Length of stationary objectVSIllumination intensity

Solution Approach 1:

The patent applies local quality by differentiating the drive configuration for different regions of the display panel. Specifically, it introduces a first shift register unit for driving first pixel rows and a second shift register unit for driving second pixel rows, with the second shift register unit having a different drive ratio. This regional differentiation allows optimization of brightness uniformity in specific areas (particularly bottom pixel rows) while maintaining the narrow bezel design overall.

Inventive Principle:

Principle #3Local quality

2Device complexity

If fewer shift registers are used to reduce bezel area, then the device complexity is reduced, but the display uniformity deteriorates

Engineering Contradiction:

Improvenumber of shift registersVSAvoiddisplay uniformity

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The patent segments the shift register functionality into at least two distinct units: a first shift register unit and a second shift register unit. Each unit is responsible for driving specific pixel rows with different drive ratios. This segmentation allows the system to maintain manageable complexity while achieving better display uniformity, as each shift register unit can be optimized independently for its specific driving task.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by differentiating the drive configuration for different regions of the display panel. Specifically, it introduces a first shift register unit for driving first pixel rows and a second shift register unit for driving second pixel rows, with the second shift register unit having a different drive ratio. This regional differentiation allows optimization of brightness uniformity in specific areas (particularly bottom pixel rows) while maintaining the narrow bezel design overall.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12494176B2Display panel and display device

Publication Date: 2025.12.09 WUHAN TIANMA MICRO ELECTRONICS CO LTD

AI summary

A display panel includes a display region, a shift register region, and a compensation region. The display region includes multiple display pixel groups. A display pixel group includes multiple first pixel units arranged in sequence along a first direction. The shift register region includes first shift register units and second shift register units. A first shift register unit is electrically connected to m display pixel groups, and a second shift register unit is electrically connected to n display pixel groups, where m and n are positive integers, and m>n. The compensation region includes load compensation units electrically connected to the second shift register units.