Display Panel Bottom Layer Voltage Control for Afterimage Reduction
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Solution Overview
Problem
Large-sized flat panel display devices often suffer from reduced display quality due to afterimages, which are perceived as a result of the increased display area and added functions, leading to suboptimal performance.
Innovation Solution
A display panel design that includes a substrate with a first and second pixel area, each equipped with a transistor and a display element, and a bottom layer with varying voltages applied in different periods to minimize afterimages, with the bottom layers being electrically insulated and potentially made of metal, and connected to a switching unit for voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display area of a flat panel display device is increased to expand functionality, then the range of use and versatility are improved, but afterimages are perceived and display quality deteriorates
Solution Approach 1:
The patent applies periodic action by alternating the voltage applied to the bottom layer between different time periods. During a first time period, a first voltage is applied to the bottom layer, and during a second time period, a second voltage different from the first voltage is applied. This periodic voltage switching prevents afterimages from accumulating while maintaining display functionality, thereby resolving the contradiction between expanded display area and display quality.
2Reliability
If a bottom layer is introduced below the transistor to control voltage, then display quality is improved by reducing afterimages, but device complexity increases
Solution Approach 1:
The bottom layer serves multiple functions: it acts as a voltage control element to prevent afterimages, provides structural support beneath the transistor, and can function as an electrode or interconnect layer. By making the bottom layer multi-functional, the patent reduces the need for additional separate components, thereby improving display quality without proportionally increasing device complexity.
3Reliability
If voltage switching is implemented on the bottom layer to prevent afterimages, then display quality is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by switching the voltage on the bottom layer only during specific time periods when needed to prevent afterimages, rather than continuously switching. The voltage is alternated between a first voltage during a first time period and a second voltage during a second time period, applying the corrective action only when necessary, thereby reducing overall energy consumption while maintaining display quality.
Data Source
AI summary
A display panel includes: a substrate; a first pixel arranged over the substrate and including a first transistor and a first display element electrically connected to the first transistor; and a first bottom layer arranged between the substrate and the first transistor, wherein the first bottom layer has a first voltage in a first period and has a second voltage in a second period different from the first period. The first and second voltages differ from one another.