LED Control Circuit Parallel Branches Prevent Carrier Generation
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Solution Overview
Problem
In LED display circuits, short-circuiting LEDs to control light emission leads to the generation of photo-generated carriers, affecting the brightness of other LEDs connected in series.
Innovation Solution
A light-emitting element control circuit with a current source and parallel branches, each branch containing a gating unit and a light-emitting element, allowing active selection of current paths to prevent short-circuiting and carrier generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the LED is controlled to switch from light-emitting state to non-light-emitting state through short-circuiting, then the light-emitting element can be turned off, but photo-generated carriers are generated and the brightness of other LEDs is affected
Solution Approach 1:
The patent divides the circuit into multiple independent parallel branches, each containing a light-emitting element and control switch. This segmentation allows independent control of each branch while preventing photo-generated carriers from affecting other LEDs, as each branch is electrically isolated through the parallel connection structure
Solution Approach 2:
The patent introduces control switches (first control switch and second control switch) as intermediary components in each parallel branch. These switches act as mediators to control current flow to individual light-emitting elements without requiring short-circuiting, thereby preventing the generation of photo-generated carriers that would affect other LEDs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution prevents the generation of photo-generated carriers, ensuring that the light-emitting elements are turned on or off without affecting the brightness of other LEDs, thereby maintaining display performance.
Implementation Method 1
a first gating unit and a light-emitting element which are connected in series
Implementation Method 2
the LED still generates photo-generated carriers and thus the brightness of other LEDs is affected
Data Source
AI summary
Provided is a light-emitting element control circuit, a display panel and a display device. The light-emitting element control circuit includes a current source and at least one light-emitting unit, and the at least one light-emitting unit is connected in series to the current source. The at least one light-emitting unit each includes a first branch and a second branch which are connected in parallel. The first branch includes a first gating unit and a light-emitting element which are connected in series, and the second branch includes a second gating unit. The light-emitting element control circuit provided by the present application enables the current provided by the current source to pass through one of the first branch and the second branch in an active-selection mode, and meanwhile generation of photo-generated carriers in the light-emitting element can be avoided, thereby improving the display effect.