Display Driver Pixel Compensation for Staggered Bump Routing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The staggered bump arrangement in display drivers, used to facilitate the placement of routing traces on display panels, leads to variations in resistances and capacitances of routing traces, causing image artifacts such as uneven image brightness due to differences in trace lengths.
Innovation Solution
A display driver with a data compensation circuit that processes input pixel data based on the location of bumps in the staggered bump array to generate compensated pixel data, which is then used to output data voltages, mitigating the variations in resistances and capacitances of the routing traces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a staggered bump arrangement is used to facilitate routing trace placement, then the number of routing traces that can be placed increases and the area required for bumps is reduced, but variations in resistances and capacitances of routing traces occur causing image artifacts
Solution Approach 1:
The patent applies local quality by implementing location-based pixel data compensation. Different compensation values are applied to pixels depending on their specific location in the display panel, particularly those coupled to bumps in different rows of the staggered bump array. This localized compensation approach addresses the varying resistance and capacitance characteristics of routing traces at different positions without requiring a complete redesign of the bump arrangement, thus maintaining high routing density while improving image uniformity.
2Area of stationary object
If a staggered bump arrangement is used to reduce the area required for bumps, then the display driver size is reduced, but variations in routing trace lengths cause uneven image brightness
Solution Approach 1:
The patent applies parameter changes by modifying the pixel data parameters based on bump location. Specifically, compensation values are added to or subtracted from the original pixel data depending on which row the bump is located in. This changes the electrical parameters (voltage levels) of the pixel data to compensate for the varying routing trace characteristics, thereby maintaining uniform image brightness while preserving the space-efficient staggered bump arrangement.
3Ease of manufacture
If bumps are arranged in a staggered pattern to facilitate routing, then routing trace placement is improved, but differences in trace lengths cause variations in resistances and capacitances
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying compensation values to pixel data before it is sent to the display pixels. The compensation circuit determines the location of each bump and applies appropriate compensation values in advance, so that when the pixel data travels through routing traces of different lengths and impedances, the final voltage at each pixel location is corrected for the expected variations. This preliminary compensation ensures reliable and consistent electrical parameters despite the staggered bump arrangement.
Data Source
AI summary
A display driver includes a bump array with a staggered bump arrangement, a data compensation circuit, and driver circuitry. The data compensation circuit processes input pixel data for a pixel of a display panel to generate compensated pixel data. The driver circuitry generates a data voltage based on the compensated pixel data and output the data voltage to the pixel via a bump of the bump array. The processing of the input pixel data is based on a location of the bump in the bump array.